libstdc++: Rework std::copy/copy_backward/move/move_backward/fill/fill_n algos

[thirdparty/gcc.git] / libstdc++-v3 / ChangeLog

2019-12-10  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/stl_algobase.h
	(__copy_move_a1<>(_II, _II, _OI)): New.
	(__copy_move_a1<>(_Deque_iterator<>, _Deque_iterator<>, _OI)): New.
	(__copy_move_a1<>(_Deque_iterator<>, _Deque_iterator<>,
	_Deque_iterator<>)): New.
	(__copy_move_a1<>(_II, _II, _Deque_iterator<>)): New.
	(__copy_move_a<>(_II, _II, _OI)): Adapt, call __copy_move_a1<>.
	(__copy_move_a<>(const _Safe_iterator<>&, const _Safe_iterator<>&,
	_OI)): New.
	(__copy_move_a<>(const _Safe_iterator<>&, const _Safe_iterator<>&,
	 const _Safe_iterator<>&)): New.
	(__copy_move_a<>(_II, _II, const _Safe_iterator<>&)): New.
	(copy, move): Adapt, call __copy_move_a.
	(__copy_move_backward_a1<>(_II, _II, _OI)): New,
	call __copy_move_backward_a2.
	(__copy_move_backward_a1<>(_Deque_iterator<>, _Deque_iterator<>, _OI)): New.
	(__copy_move_backward_a1<>(_Deque_iterator<>, _Deque_iterator<>,
	_Deque_iterator<>)): New.
	(__copy_move_backward_a1<>(_II, _II, _Deque_iterator<>)): New.
	(__copy_move_backward_a<>(_II, _II, _OI)): Adapt, call
	__copy_move_backward_a1<>.
	(__copy_move_backward_a<>(const _Safe_iterator<>&, const _Safe_iterator<>&,
	_OI)): New.
	(__copy_move_backward_a<>(const _Safe_iterator<>&, const _Safe_iterator<>&,
	 const _Safe_iterator<>&)): New.
	(__copy_move_backward_a<>(_II, _II, const _Safe_iterator<>&)): New.
	(copy_backward, move_backward): Adapt, call __copy_move_backward_a<>.
	(__fill_a): Rename into...
	(__fill_a1): ... this.
	(__fill_a1(__normal_iterator<>, __normal_iterator<>, const _Tp&)): New.
	(__fill_a1(const _Deque_iterator<>&, const _Deque_iterator<>&, _VTp)):
	New.
	(__fill_a(_FIte, _FIte, const _Tp&)): New, call __fill_a1.
	(__fill_a(const _Safe_iterator<>&, const _Safe_iterator<>&,
	const _Tp&)): New.
	(fill): Adapt, remove __niter_base usage.
	(__fill_n_a): Rename into...
	(__fill_n_a1): ...this.
	(__fill_n_a(const _Safe_iterator<>&, _Size, const _Tp&,
	input_iterator_tag)): New.
	(__fill_n_a(_OI, _Size, const _Tp&, output_iterator_tag)): New, call
	__fill_n_a1.
	(__fill_n_a(_OI, _Size, const _Tp&, random_access_iterator_tag)): New,
	call __fill_a.
	(__equal_aux): Rename into...
	(__equal_aux1): ...this.
	(__equal_aux1(_Deque_iterator<>, _Deque_iterator<>, _OI)): New.
	(__equal_aux1(_Deque_iterator<>, _Deque_iterator<>,
	_Deque_iterator<>)): New.
	(__equal_aux1(_II, _II, _Deque_iterator<>)): New.
	(__equal_aux(_II1, _II1, _II2)): New, call __equal_aux1.
	(__equal_aux(const _Safe_iterator<>&, const _Safe_iterator<>&,
	_OI)): New.
	(__equal_aux(const _Safe_iterator<>&, const _Safe_iterator<>&,
	 const _Safe_iterator<>&)): New.
	(__equal_aux(_II, _II, const _Safe_iterator<>&)): New.
	(equal(_II1, _II1, _II2)): Adapt.
	* include/bits/stl_deque.h
	(fill, copy, copy_backward, move, move_backward): Remove.
	* include/bits/deque.tcc: Include <bits/stl_algobase.h>.
	(__fill_a1): New.
	(__copy_move_dit): New.
	(__copy_move_a1): New, use latter.
	(__copy_move_a1(_II, _II, _Deque_iterator<>)): New.
	(__copy_move_backward_dit): New.
	(__copy_move_backward_a1): New, use latter.
	(__copy_move_backward_a1(_II, _II, _Deque_iterator<>)): New.
	(__equal_dit): New.
	(__equal_aux1): New, use latter.
	(__equal_aux1(_II, _II, _Deque_iterator<>)): New.
	* include/std/numeric (__is_random_access_iter): Move...
	* include/bits/stl_iterator_base_types.h (__is_random_access_iter): ...
	here. Provide pre-C++11 definition.
	* include/debug/debug.h (_Safe_iterator<>): New declaration.
	* include/debug/safe_iterator.h (_Safe_iterator<>::_M_can_advance): Add
	__strict parameter.
	* include/debug/safe_iterator.tcc: Include <bits/stl_algobase.h>.
	(_Safe_iterator<>::_M_can_advance): Adapt.
	(std::__copy_move_a, std::__copy_move_backward_a, __fill_a): New.
	(__fill_n_a, __equal_aux): New.
	* include/debug/stl_iterator.h (__niter_base): Remove.
	* include/debug/vector (__niter_base): Remove.
	* testsuite/performance/25_algorithms/copy_backward_deque_iterators.cc:
	Include <vector> and <list>. Add benches.
	* testsuite/performance/25_algorithms/copy_deque_iterators.cc: Likewise.
	* testsuite/performance/25_algorithms/equal_deque_iterators.cc: Likewise.
	* testsuite/25_algorithms/copy/debug/1_neg.cc: New.
	* testsuite/25_algorithms/copy/deque_iterators/2.cc: New.
	* testsuite/25_algorithms/copy/deque_iterators/31.cc: New.
	* testsuite/25_algorithms/copy/deque_iterators/32.cc: New.
	* testsuite/25_algorithms/copy/deque_iterators/33.cc: New.
	* testsuite/25_algorithms/copy/deque_iterators/41.cc: New.
	* testsuite/25_algorithms/copy/deque_iterators/42.cc: New.
	* testsuite/25_algorithms/copy/deque_iterators/43.cc: New.
	* testsuite/25_algorithms/copy/streambuf_iterators/char/4.cc (test02):
	New.
	* testsuite/25_algorithms/copy_backward/deque_iterators/2.cc: New.
	* testsuite/25_algorithms/equal/deque_iterators/1.cc: New.
	* testsuite/25_algorithms/fill/deque_iterators/1.cc: New.
	* testsuite/25_algorithms/move/deque_iterators/2.cc: New.
	* testsuite/25_algorithms/move_backward/deque_iterators/2.cc: New.

2019-12-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/92886
	* include/bits/ios_base.h (std::ios_base::trunc): Fix comment.

	* include/std/complex (__cpp_lib_constexpr_complex): Define.
	* include/std/version (__cpp_lib_constexpr_complex): Likewise.
	* testsuite/26_numerics/complex/1.cc: New test.
	* testsuite/26_numerics/complex/2.cc: New test.

	* include/std/span: Do not include <tuple> and <utility>.
	(tuple_size, tuple_element): Declare.

	* include/bits/iterator_concepts.h (indirect_result_t): Do not apply
	iter_reference_t to parameter pack.
	* testsuite/24_iterators/indirect_callable/projected.cc: New test.

2019-12-09  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/range_access.h (ranges::enable_safe_range): Define.
	(ranges::begin, ranges::end, ranges::rbegin, ranges::rend): Constrain
	to only accept types satisfying safe_range and treat argument as an
	lvalue when calling a member of performing ADL.
	(ranges::__detail::__range_impl, ranges::__detail::__forwarding_range):
	Remove.
	(ranges::range): Adjust definition.
	(ranges::safe_range): Define.
	(ranges::iterator_t, ranges::range_difference_t): Reorder definitions
	to match the synopsis in the working draft.
	(ranges::disable_sized_range): Remove duplicate definition.
	* include/experimental/string_view (ranges::enable_safe_range): Add
	partial specialization for std::experimental::basic_string_view.
	* include/std/ranges (ranges::viewable_range, ranges::subrange)
	(ranges::empty_view, ranges::iota_view): Use safe_range. Specialize
	enable_safe_range.
	(ranges::safe_iterator_t, ranges::safe_subrange_t): Define.
	* include/std/span (ranges::enable_safe_range): Add partial
	specialization for std::span.
	* include/std/string_view (ranges::enable_safe_range): Likewise for
	std::basic_string_view.
	* testsuite/std/ranges/access/begin.cc: Adjust expected results.
	* testsuite/std/ranges/access/cbegin.cc: Likewise.
	* testsuite/std/ranges/access/cdata.cc: Likewise.
	* testsuite/std/ranges/access/cend.cc: Likewise.
	* testsuite/std/ranges/access/crbegin.cc: Likewise.
	* testsuite/std/ranges/access/crend.cc: Likewise.
	* testsuite/std/ranges/access/data.cc: Likewise.
	* testsuite/std/ranges/access/end.cc: Likewise.
	* testsuite/std/ranges/access/rbegin.cc: Likewise.
	* testsuite/std/ranges/access/rend.cc: Likewise.
	* testsuite/std/ranges/empty_view.cc: Test ranges::begin and
	ranges::end instead of unqualified calls to begin and end.
	* testsuite/std/ranges/safe_range.cc: New test.
	* testsuite/std/ranges/safe_range_types.cc: New test.
	* testsuite/util/testsuite_iterators.h: Add comment about safe_range.

	* testsuite/27_io/filesystem/path/concat/strings.cc: Test more cases.

	PR libstdc++/92853
	* src/c++17/fs_path.cc (filesystem::path::operator+=(const path&)):
	Do not process a trailing directory separator twice.
	* testsuite/27_io/filesystem/path/concat/92853.cc: New test.
	* testsuite/27_io/filesystem/path/concat/path.cc: Test more cases.

2019-12-09  François Dumont  <fdumont@gcc.gnu.org>

	* testsuite/23_containers/array/tuple_interface/get_debug_neg.cc:
	Fix static_assert line number.
	* testsuite/23_containers/array/tuple_interface/
	tuple_element_debug_neg.cc: Likewise.

2019-12-07  Andrew Pinski  <apinski@marvell.com>

	* config/cpu/aarch64/opt/ext/opt_random.h: Wrap around with check
	for little-endian like ext/random is done.

2019-12-05  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/23_containers/span/lwg3255.cc: Fix test. Constructing a
	span of non-const elements should not be possible from a const array
	or an array of const elements.

2019-12-05  JeanHeyd "ThePhD" Meneide  <phdofthehouse@gmail.com>

	Implement P1872R0 and P1394R0 for std::span
	* include/bits/range_access.h (__adl_begin, __adl_end): Remove.
	(sentinel_t, range_value_t, range_reference_t)
	(range_rvalue_reference_t, __forwarding_range, disable_sized_range)
	(output_range, input_range, forward_range, bidirectional_range)
	(random_access_range, contiguous_range, common_range): Move here from
	<ranges>, to make this the "ranges lite" internal header.
	* include/std/ranges: Move basic aliases and concepts to
	<bits/range_access.h>.
	* include/std/span: Use concepts and ranges:: calls instead of
	enable_if and friends.
	* include/std/type_traits: Add __is_array_convertible trait.

2019-12-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_algobase.h (lexicographical_compare_three_way):
	Define for C++20.
	* testsuite/25_algorithms/lexicographical_compare_three_way/1.cc: New
	test.
	* testsuite/25_algorithms/lexicographical_compare_three_way/
	constexpr.cc: New test.

	* python/libstdcxx/v6/printers.py (StdCmpCatPrinter): New printer.
	* testsuite/libstdc++-prettyprinters/cxx20.cc: New test.

	* include/bits/cpp_type_traits.h (__is_byte<char8_t>): Add
	specialization.
	* include/std/array (operator<=>): Likewise.
	* testsuite/23_containers/array/comparison_operators/constexpr.cc:
	Test three-way comparisons and arrays of unsigned char.
	* testsuite/23_containers/array/tuple_interface/get_neg.cc: Adjust
	dg-error line numbers.

2019-12-03  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_pair.h [__cpp_lib_three_way_comparison]
	(operator<=>): Define for C++20.
	* libsupc++/compare (__cmp2way_res_t): Rename to __cmp3way_res_t,
	move into __detail namespace. Do not turn argument types into lvalues.
	(__cmp3way_helper): Rename to __cmp3way_res_impl, move into __detail
	namespace. Constrain with concepts instead of using void_t.
	(compare_three_way_result): Adjust name of base class.
	(compare_three_way_result_t): Use __cmp3way_res_impl directly.
	(__detail::__3way_cmp_with): Add workaround for PR 91073.
	(compare_three_way): Use workaround.
	(__detail::__synth3way, __detail::__synth3way_t): Define new helpers
	implementing synth-three-way and synth-three-way-result semantics.
	* testsuite/20_util/pair/comparison_operators/constexpr_c++20.cc: New
	test.

	* include/bits/stl_pair.h (pair): Remove stray Doxygen closing marker.

	* testsuite/util/slow_clock.h: Fix copyright date.

2019-12-02  Mike Crowe  <mac@mcrowe.com>

	Fix try_lock_until and try_lock_shared_until on arbitrary clock
	* include/std/shared_mutex (shared_timed_mutex::try_lock_until)
	(shared_timed_mutex::try_lock_shared_until): Loop until the absolute
	timeout time is reached as measured against the appropriate clock.
	* testsuite/30_threads/shared_timed_mutex/try_lock_until/1.cc: New
	file. Test try_lock_until and try_lock_shared_until timeouts against
	various clocks.
	* testsuite/30_threads/shared_timed_mutex/try_lock_until/1.cc: New
	file. Test try_lock_until and try_lock_shared_until timeouts against
	various clocks.

	Add full steady_clock support to shared_timed_mutex
	* acinclude.m4 (GLIBCXX_CHECK_PTHREAD_RWLOCK_CLOCKLOCK): Define
	to check for the presence of both pthread_rwlock_clockrdlock and
	pthread_rwlock_clockwrlock.
	* config.h.in: Regenerate.
	* configure.ac: Call GLIBCXX_USE_PTHREAD_RWLOCK_CLOCKLOCK.
	* configure: Regenerate.
	* include/std/shared_mutex (shared_timed_mutex): Define __clock_t as
	the best clock to use for relative waits.
	(shared_timed_mutex::try_lock_for) Round up wait duration if necessary.
	(shared_timed_mutex::try_lock_shared_for): Likewise.
	(shared_timed_mutex::try_lock_until): Use existing try_lock_until
	implementation for system_clock (which matches __clock_t when
	_GLIBCCXX_USE_PTHREAD_RWLOCK_CLOCKLOCK is not defined). Add new
	overload for steady_clock that uses pthread_rwlock_clockwrlock if it
	is available. Simplify overload for non-standard clock to just call
	try_lock_for with a relative timeout.
	(shared_timed_mutex::try_lock_shared_until): Likewise.

	PR libstdc++/91906 Fix timed_mutex::try_lock_until on arbitrary clock
	* include/std/mutex (__timed_mutex_impl::_M_try_lock_until): Loop
	until the absolute timeout time is reached as measured against the
	appropriate clock.
	* testsuite/util/slow_clock.h: New file. Move implementation of
	slow_clock test class.
	* testsuite/30_threads/condition_variable/members/2.cc: Include
	slow_clock from header.
	* testsuite/30_threads/shared_timed_mutex/try_lock/3.cc: Convert
	existing test to templated function so that it can be called with
	both system_clock and steady_clock.
	* testsuite/30_threads/timed_mutex/try_lock_until/3.cc: Also run test
	using slow_clock to test above fix.
	* testsuite/30_threads/recursive_timed_mutex/try_lock_until/3.cc:
	Likewise.
	* testsuite/30_threads/recursive_timed_mutex/try_lock_until/4.cc: Add
	new test that try_lock_until behaves as try_lock if the timeout has
	already expired or exactly matches the current time.

	PR libstdc++/78237 Add full steady_clock support to timed_mutex
	* acinclude.m4 (GLIBCXX_CHECK_PTHREAD_MUTEX_CLOCKLOCK): Define to
	detect presence of pthread_mutex_clocklock function.
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* configure.ac: Call GLIBCXX_CHECK_PTHREAD_MUTEX_CLOCKLOCK.
	* include/std/mutex (__timed_mutex_impl): Remove unnecessary __clock_t.
	(__timed_mutex_impl::_M_try_lock_for): Use best clock to turn relative
	timeout into absolute timeout.
	(__timed_mutex_impl::_M_try_lock_until): Keep existing implementation
	for system_clock. Add new implementation for steady_clock that calls
	_M_clocklock. Modify overload for user-defined clock to use a relative
	wait so that it automatically uses the best clock.
	[_GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK] (timed_mutex::_M_clocklock):
	New member function.
	(recursive_timed_mutex::_M_clocklock): Likewise.

	* testsuite/30_threads/recursive_timed_mutex/try_lock_until/3.cc:
	New test. Ensure that timed_mutex::try_lock_until actually times out
	after the specified time when using both system_clock and
	steady_clock.
	* testsuite/30_threads/timed_mutex/try_lock_until/3.cc: New test.
	Likewise but for recursive_timed_mutex.
	* testsuite/30_threads/timed_mutex/try_lock_until/57641.cc: Template
	test functions and use them to test both steady_clock and system_clock.
	* testsuite/30_threads/unique_lock/locking/4.cc: Likewise. Wrap call
	to timed_mutex::try_lock_until in VERIFY macro to check its return
	value.

2019-11-30  Jonathan Wakely  <jwakely@redhat.com>

	* acinclude.m4 (GLIBCXX_ENABLE_FILESYSTEM_TS): Enable by default for
	mingw targets.
	* configure: Regenerate.

	* include/bits/fs_path.h (u8path(InputIterator, InputIterator))
	(u8path(const Source&)) [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Simplify
	conditions.
	* include/experimental/bits/fs_path.h [_GLIBCXX_FILESYSTEM_IS_WINDOWS]
	(__u8path(const Source&, char)): Add overloads for std::string and
	types convertible to std::string.
	(_Cvt::_S_wconvert): Add a new overload for char8_t strings and use
	codecvt_utf8_utf16 to do the correct conversion.

2019-11-29  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/fs_path.h (path::operator/=): Change template-head to
	use typename instead of class.
	* include/experimental/bits/fs_path.h (path::operator/=): Likewise.
	* include/std/ostream (operator<<): Likewise.

2019-11-29  Tom Honermann  <tom@honermann.net>

	New tests
	* testsuite/27_io/basic_ostream/inserters_character/char/deleted.cc:
	New test to validate deleted overloads of character and string
	inserters for narrow ostreams.
	* testsuite/27_io/basic_ostream/inserters_character/wchar_t/deleted.cc:
	New test to validate deleted overloads of character and string
	inserters for wide ostreams.
	* testsuite/27_io/filesystem/path/factory/u8path-char8_t.cc: New test
	to validate u8path invocations with sequences of char8_t.
	* testsuite/experimental/filesystem/path/factory/u8path-char8_t.cc:
	New test to validate u8path invocations with sequences of char8_t.

	Updates to existing tests
	* testsuite/experimental/feat-char8_t.cc: Updated the expected
	__cpp_lib_char8_t feature test macro value.
	* testsuite/27_io/filesystem/path/factory/u8path.cc: Added testing of
	u8path invocation with std::string, std::string_view, and iterators
	thereof.
	* testsuite/experimental/filesystem/path/factory/u8path.cc: Added
	testing of u8path invocation with std::string, std::string_view, and
	iterators thereof.

	Update feature test macro, add deleted operators, update u8path
	* include/bits/c++config: Bumped the value of the __cpp_lib_char8_t
	feature test macro.
	* include/bits/fs_path.h (u8path): Modified u8path to accept sequences
	of char8_t.
	* include/experimental/bits/fs_path.h (u8path): Modified u8path to
	accept sequences of char8_t.
	* include/std/ostream: Added deleted overloads of wchar_t, char8_t,
	char16_t, and char32_t for ordinary and wide formatted character and
	string inserters.

	Decouple constraints for u8path from path constructors
	* include/bits/fs_path.h: Moved helper utilities out of
	std::filesystem::path into a detail namespace to make them
	available for use by u8path.
	* include/experimental/bits/fs_path.h: Moved helper utilities out
	of std::experimental::filesystem::v1::path into a detail
	namespace to make them available for use by u8path.

2019-11-29  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/91997
	* python/libstdcxx/v6/printers.py (find_type): Fail more gracefully
	if we run out of base classes to look at.
	(lookup_templ_spec, lookup_node_type): New utilities to find node
	types for node-based containers.
	(StdListPrinter.children, NodeIteratorPrinter.__init__)
	(NodeIteratorPrinter.to_string, StdSlistPrinter.children)
	(StdSlistIteratorPrinter.to_string, StdRbtreeIteratorPrinter.__init__)
	(StdMapPrinter.children, StdSetPrinter.children)
	(StdForwardListPrinter.children): Use lookup_node_type instead of
	find_type.
	(StdListIteratorPrinter.__init__, StdFwdListIteratorPrinter.__init__):
	Pass name of node type to NodeIteratorPrinter constructor.
	(Tr1HashtableIterator.__init__): Rename argument.
	(StdHashtableIterator.__init__): Likewise. Use lookup_templ_spec
	instead of find_type.
	* testsuite/libstdc++-prettyprinters/59161.cc: Remove workaround for
	_Node typedef not being present in debuginfo.
	* testsuite/libstdc++-prettyprinters/91997.cc: New test.

2019-11-26  François Dumont  <fdumont@gcc.gnu.org>

	* include/debug/helper_functions.h (__valid_range_aux): Use C++98
	std::input_iterator_tag default constructor invocation.

	* include/debug/array (array<>::fill): Add C++20 constexpr.
	(array<>::swap): Likewise.

	* include/debug/safe_iterator.h
	[__cpp_lib_concepts](_Safe_iterator<>::iterator_concept): Define for
	C++20.

2019-11-25  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/iterator_concepts.h (ranges::iter_swap): Fix parameter
	types of poison pill overload. Use remove_reference_t when checking
	constraints.
	* include/bits/stl_iterator.h (move_sentinel): Define for C++20.
	(move_iterator): Adjust definitions of nested types for C++20. Add
	hidden friends for move_sentinel operations, iter_move and iter_swap.
	(common_iterator, counted_iterator): Define for C++20.
	* testsuite/24_iterators/move_iterator/cust.cc: New test.
	* testsuite/24_iterators/move_iterator/sentinel.cc: New test.
	* testsuite/24_iterators/common_iterator/1.cc: New test.
	* testsuite/24_iterators/counted_iterator/1.cc: New test.

	PR libstdc++/91786
	* include/bits/fs_path.h (filesystem_error): Move definition before
	the use in u8path.

2019-11-24  François Dumont  <fdumont@gcc.gnu.org>

	* include/debug/functions.h: Remove <bits/move.h> include.
	(__check_singular_aux, __check_singular): Move...
	* include/debug/helper_functions.h:
	(__check_singular_aux, __check_singular): ...here.
	(__valid_range_aux): Adapt to use latter.
	* testsuite/25_algorithms/copy/debug/2_neg.cc: New.

2019-11-20  Janne Blomqvist  <jb@gcc.gnu.org>

	* doc/html/api.html: Use https for gcc.gnu.org.
	* doc/xml/api.xml: Likewise.

2019-11-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/regex.h (ranges::__detail::__enable_view_impl): Fix
	declaration.
	* include/bits/stl_multiset.h (ranges::__detail::__enable_view_impl):
	Likewise.
	* include/bits/stl_set.h (ranges::__detail::__enable_view_impl):
	Likewise.
	* include/bits/unordered_set.h (ranges::__detail::__enable_view_impl):
	Likewise.
	* include/debug/multiset.h (ranges::__detail::__enable_view_impl):
	Likewise.
	* include/debug/set.h (ranges::__detail::__enable_view_impl): Likewise.
	* include/debug/unordered_set (ranges::__detail::__enable_view_impl):
	Likewise.

2019-11-18  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/thread: Reduce header dependencies.
	(jthread::get_id()): Add missing return.
	(jthread::get_stop_token()): Avoid unnecessary stop_source temporary.
	(jthread::_S_create): Check is_invocable using decayed types. Add
	static assertion.
	* testsuite/30_threads/jthread/1.cc: Add dg-require-gthreads.
	* testsuite/30_threads/jthread/2.cc: Likewise.
	* testsuite/30_threads/jthread/3.cc: New test.
	* testsuite/30_threads/jthread/jthread.cc: Add missing directives for
	pthread and gthread support. Use VERIFY instead of assert.

	* include/bits/alloc_traits.h (allocator_traits::construct)
	(allocator_traits::destroy, allocator_traits::max_size): Add unused
	attributes to parameters that are not used in C++20.
	* include/std/bit (__ceil2): Add braces around assertion to avoid
	-Wmissing-braces warning.

2019-11-16  Edward Smith-Rowland  <3dw4rd@verizon.net>

	Repair the <tuple> part of C++20 p1032 Misc constexpr bits.
	* include/bits/uses_allocator.h (__uses_alloc0::_Sink::operaror=)
	(__use_alloc(const _Alloc&)) : Constexpr.

2019-11-17  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/string_view (basic_string_view(It, End)): Add range
	constructor and deduction guide from P1391R4.
	* testsuite/21_strings/basic_string_view/cons/char/range.cc: New test.

	* include/bits/regex.h (match_results): Specialize __enable_view_impl.
	* include/bits/stl_set.h (set): Likewise.
	* include/bits/unordered_set.h (unordered_set, unordered_multiset):
	Likewise.
	* include/debug/multiset.h (__debug::multiset): Likewise.
	* include/debug/set.h (__debug::set): Likewise.
	* include/debug/unordered_set (__debug::unordered_set)
	(__debug::unordered_multiset): Likewise.
	* include/std/ranges (ranges::view, ranges::enable_view)
	(ranges::view_interface, ranges::subrange, ranges::empty_view)
	(ranges::single_view, ranges::views::single, ranges::iota_view)
	(ranges::views::iota): Define for C++20.
	* testsuite/std/ranges/empty_view.cc: New test.
	* testsuite/std/ranges/iota_view.cc: New test.
	* testsuite/std/ranges/single_view.cc: New test.
	* testsuite/std/ranges/view.cc: New test.

2019-11-16  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/ranges: Revert accidentally committed changes.

	* include/std/thread (jthread::jthread()): Use nostopstate constant.
	(jthread::jthread(Callable&&, Args&&...)): Use helper function to
	create std::thread instead of indirection through a lambda. Use
	remove_cvref_t instead of decay_t.
	(jthread::joinable(), jthread::get_id(), jthread::native_handle())
	(jthread::hardware_concurrency()): Add nodiscard attribute.
	(swap(jthread&. jthread&)): Define hidden friend.
	(jthread::_S_create): New helper function for constructor.

2019-11-15  Edward Smith-Rowland  <3dw4rd@verizon.net>

	Implement the <tuple> part of C++20 p1032 Misc constexpr bits.
	* include/std/tuple (_Head_base, _Tuple_impl(allocator_arg_t,...)
	(_M_assign, tuple(allocator_arg_t,...), _Inherited, operator=, _M_swap)
	(swap, pair(piecewise_construct_t,): Constexpr.
	* (__uses_alloc0::_Sink::operator=, __uses_alloc_t): Constexpr.
	* testsuite/20_util/tuple/cons/constexpr_allocator_arg_t.cc: New test.
	* testsuite/20_util/tuple/constexpr_swap.cc : New test.
	* testsuite/20_util/uses_allocator/69293_neg.cc: Extra error for C++20.
	* testsuite/20_util/uses_allocator/cons_neg.cc: : Extra error for C++20.

2019-11-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/stop_token: Reduce header dependencies by including
	internal headers.
	(stop_token::swap(stop_token&), swap(stop_token&, stop_token&)):
	Define.
	(operator!=(const stop_token&, const stop_token&)): Fix return value.
	(stop_token::_Stop_cb::_Stop_cb(Cb&&)): Use std::forward instead of
	(stop_token::_Stop_state_t) [_GLIBCXX_HAS_GTHREADS]: Use lock_guard
	instead of unique_lock.
	[!_GLIBCXX_HAS_GTHREADS]: Do not use mutex.
	(stop_token::stop_token(_Stop_state)): Change parameter to lvalue
	reference.
	(stop_source): Remove unnecessary using-declarations for names only
	used once.
	(swap(stop_source&, stop_source&)): Define.
	(stop_callback(const stop_token&, _Cb&&))
	(stop_callback(stop_token&&, _Cb&&)): Replace lambdas with a named
	function. Use std::forward instead of std::move. Run callbacks if a
	stop request has already been made.
	(stop_source::_M_execute()): Remove.
	(stop_source::_S_execute(_Stop_cb*)): Define.
	* include/std/version (__cpp_lib_jthread): Define conditionally.
	* testsuite/30_threads/stop_token/stop_callback.cc: New test.
	* testsuite/30_threads/stop_token/stop_source.cc: New test.
	* testsuite/30_threads/stop_token/stop_token.cc: Enable test for
	immediate execution of callback.

2019-11-15  Edward Smith-Rowland  <3dw4rd@verizon.net>

	Implement the default_searcher part of C++20 p1032 Misc constexpr bits.
	* include/std/functional
	(default_searcher, default_searcher::operator()): Constexpr.
	* testsuite/20_util/function_objects/constexpr_searcher.cc: New.

2019-11-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/iterator_concepts.h (weakly_incrementable): Adjust.
	* include/std/concepts (default_constructible): Rename to
	default_initializable and require default-list-initialization and
	default-initialization to be valid (LWG 3149).
	(semiregular): Adjust to new name.
	* testsuite/std/concepts/concepts.lang/concept.defaultconstructible/
	1.cc: Rename directory to concept.defaultinitializable and adjust to
	new name.
	* testsuite/std/concepts/concepts.lang/concept.defaultinitializable/
	lwg3149.cc: New test.
	* testsuite/util/testsuite_iterators.h (test_range): Adjust.

	* src/c++17/fs_path.cc [_GLIBCXX_FILESYSTEM_IS_WINDOWS]
	(is_disk_designator): New helper function.
	(path::_Parser::root_path()): Use is_disk_designator.
	(path::lexically_relative(const path&)): Implement resolution of
	LWG 3070.
	* testsuite/27_io/filesystem/path/generation/relative.cc: Check with
	path components that look like a root-name.

	* doc/doxygen/user.cfg.in: Add <stop_token>.
	* include/precompiled/stdc++.h: Likewise.
	* include/std/stop_token: Fix definition of std::nostopstate.
	* testsuite/30_threads/headers/stop_token/synopsis.cc: New test.
	* testsuite/30_threads/headers/thread/types_std_c++20.cc: New test.
	* testsuite/30_threads/stop_token/stop_source.cc: New test.
	* testsuite/30_threads/stop_token/stop_token.cc: Remove unnecessary
	dg-require directives. Remove I/O and inclusion of <iostream>.

2019-11-14  Thomas Rodgers  <trodgers@redhat.com>

	* include/Makefile.am: Add <stop_token> header.
	* include/Makefile.in: Regenerate.
	* include/std/condition_variable: Add overloads for stop_token support
	to condition_variable_any.
	* include/std/stop_token: New file.
	* include/std/thread: Add jthread type.
	* include/std/version (__cpp_lib_jthread): New value.
	* testsuite/30_threads/condition_variable_any/stop_token/1.cc: New test.
	* testsuite/30_threads/condition_variable_any/stop_token/2.cc: New test.
	* testsuite/30_threads/condition_variable_any/stop_token/wait_on.cc:
	New test.
	* testsuite/30_threads/jthread/1.cc: New test.
	* testsuite/30_threads/jthread/2.cc: New test.
	* testsuite/30_threads/jthread/jthread.cc: New test.
	* testsuite/30_threads/stop_token/1.cc: New test.
	* testsuite/30_threads/stop_token/2.cc: New test.
	* testsuite/30_threads/stop_token/stop_token.cc: New test.

2019-11-14  Edward Smith-Rowland  <3dw4rd@verizon.net>

	Implement the <array> part of C++20 p1032 Misc constexpr bits.
	* include/std/array (fill, swap): Make constexpr.
	* testsuite/23_containers/array/requirements/constexpr_fill.cc: New.
	* testsuite/23_containers/array/requirements/constexpr_swap.cc: New.

2019-11-14  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/iterator_concepts.h (__iter_concept_impl): Add
	comments.
	(indirect_relation): Rename to indirect_binary_predicate and adjust
	definition as per P1716R3.
	(indirect_equivalence_relation): Define.
	(indirectly_comparable): Adjust definition.
	* include/std/concepts (equivalence_relation): Define.
	* testsuite/std/concepts/concepts.callable/relation.cc: Add tests for
	equivalence_relation.

	* include/bits/iterator_concepts.h (disable_sized_sentinel): Rename to
	disable_sized_sentinel_for.
	* testsuite/24_iterators/headers/iterator/synopsis_c++20.cc: Adjust.

2019-11-13  Jonathan Wakely  <jwakely@redhat.com>

	* libsupc++/compare (strong_order, weak_order, partial_order)
	(compare_strong_order_fallback, compare_weak_order_fallback)
	(compare_partial_order_fallback): Define customization point objects
	for C++20.
	* testsuite/18_support/comparisons/algorithms/partial_order.cc: New
	test.
	* testsuite/18_support/comparisons/algorithms/strong_order.cc: New
	test.
	* testsuite/18_support/comparisons/algorithms/weak_order.cc: New test.

2019-11-11  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/gnu/gpl-3.0.xml: Adjust link to "Why not LGPL".

2019-11-10  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/using.xml: Switch www.hboehm.info to https.

2019-11-07  Jonathan Wakely  <jwakely@redhat.com>

	* doc/doxygen/user.cfg.in (INPUT): Add <compare> header.
	* include/precompiled/stdc++.h: Include <compare> header.

	* libsupc++/compare (common_comparison_category)
	(common_comparison_category_t): Define for C++20.
	* testsuite/18_support/comparisons/common/1.cc: New test.

	* include/bits/stl_algo.h (for_each_n): Handle negative count.
	* testsuite/25_algorithms/for_each/for_each_n_debug.cc: New test.

2019-11-07  Jason Merrill  <jason@redhat.com>

	* libsupc++/compare: Remove strong_equality and weak_equality.

2019-11-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/Makefile.in: Regenerate.
	* libsupc++/Makefile.in: Regenerate.
	* libsupc++/compare (__3way_builtin_ptr_cmp): Define helper.
	(compare_three_way): Add missing implementation.

	* include/bits/iterator_concepts.h (unreachable_sentinel_t): Remove
	redundant equality operators.
	* testsuite/util/testsuite_iterators.h (test_range::sentinel):
	Likewise.

2019-11-05  Jonathan Wakely  <jwakely@redhat.com>

	* libsupc++/compare: New header.
	* libsupc++/Makefile.am (std_HEADERS): Add compare.
	* include/std/version: Define __cpp_lib_three_way_comparison.
	* include/std/functional: #include <compare>.

	* include/std/version [!_GLIBCXX_HOSTED]: Do not define feature test
	macros for features that are only present in hosted builds.

	* include/bits/iterator_concepts.h (__iter_without_nested_types):
	Remove incorrect comment.

2019-10-31  Jonathan Wakely  <jwakely@redhat.com>

	* doc/html/*: Regenerate.

	* include/bits/refwrap.h (reference_wrapper, ref, cref): Add constexpr
	specifiers for C++20.
	* include/std/functional (_Mem_fn, mem_fn, _Bind, _Bind_result, bind)
	(bind_front, _Not_fn, not_fn): Likewise.
	* testsuite/20_util/bind/constexpr.cc: New test.
	* testsuite/20_util/function_objects/bind_front/constexpr.cc: New test.
	* testsuite/20_util/function_objects/mem_fn/constexpr.cc: New test.
	* testsuite/20_util/function_objects/not_fn/constexpr.cc: New test.
	* testsuite/20_util/reference_wrapper/constexpr.cc: New test.

	* doc/doxygen/user.cfg.in: Add new header.
	* include/Makefile.am: Add new header.
	* include/Makefile.in: Regenerate.
	* include/precompiled/stdc++.h: Include new header.
	* include/std/ranges: New header.
	(ranges::sentinel_t, ranges::range_value_t, ranges::range_reference_t)
	(ranges::range_rvalue_reference_t, ranges::sized_range)
	(ranges::output_range, ranges::input_ranges, ranges::forward_range)
	(ranges::bidirectional_range, ranges::random_access_range)
	(ranges::contiguous_range, ranges::common::range): Define.
	* testsuite/24_iterators/headers/iterator/synopsis_c++20.cc: Check
	that disabled_sized_sentinel can be specialized.
	* testsuite/std/ranges/access/begin.cc: Include <ranges> instead of
	<iterator>.
	* testsuite/std/ranges/access/cbegin.cc: Likewise.
	* testsuite/std/ranges/access/cdata.cc: Likewise.
	* testsuite/std/ranges/access/cend.cc: Likewise.
	* testsuite/std/ranges/access/crbegin.cc: Likewise.
	* testsuite/std/ranges/access/crend.cc: Likewise.
	* testsuite/std/ranges/access/data.cc: Likewise.
	* testsuite/std/ranges/access/empty.cc: Likewise.
	* testsuite/std/ranges/access/end.cc: Likewise.
	* testsuite/std/ranges/access/end_neg.cc: Likewise.
	* testsuite/std/ranges/access/rbegin.cc: Likewise.
	* testsuite/std/ranges/access/rend.cc: Likewise.
	* testsuite/std/ranges/access/size.cc: Likewise.
	* testsuite/std/ranges/access/size_neg.cc: Likewise.
	* testsuite/std/ranges/headers/ranges/synopsis.cc: New test.
	* testsuite/std/ranges/range.cc: New test.
	* testsuite/std/ranges/refinements.cc: New test.
	* testsuite/std/ranges/sized.cc: New test.
	* testsuite/util/testsuite_iterators.h: Add aliases for range types.
	(output_iterator_wrapper::WritableObject::operator=): Add const
	qualifier so that output_iterator_wrapper satisfies writable.

	* testsuite/20_util/add_pointer/value.cc: Check void types.

	* include/bits/range_access.h (__sizable): Rename to __sentinel_size.
	Remove workaround for PR c++/92268 and remove redundant requirements
	that are already checked by sized_sentinel_for.
	* testsuite/std/ranges/access/cend.cc: Fix failures.
	* testsuite/std/ranges/access/end.cc: Likewise.

	* include/bits/range_access.h (ranges::begin): Combine array and
	non-array overloads into one function template. Only use ADL for
	classes and enums.
	(ranges::end, ranges::size): Likewise. Make unbounded arrays
	ill-formed.
	(ranges::rbegin, ranges::rend): Only use ADL for classes and enums.
	Reformat _S_noexcept() functions to mirror operator() structure.
	* testsuite/std/ranges/access/begin.cc: Check incomplete array.
	* testsuite/std/ranges/access/end_neg.cc: New test.
	* testsuite/std/ranges/access/size.cc: Check array of incomplete type.
	* testsuite/std/ranges/access/size_neg.cc: New test.

	* testsuite/24_iterators/range_access*.cc: Move to ...
	* testsuite/24_iterators/range_access/range_access*.cc: ... here.
	* testsuite/24_iterators/range_access/range_access_cpp20_neg.cc: New
	test.

2019-10-30  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/concepts (std::ranges::swap): Use a single overload for
	the non-array cases, and switch using if-constexpr.

	* include/bits/stl_iterator.h (__normal_iterator::iterator_concept):
	Guard with __cpp_lib_concepts macro.

	* include/std/bit (__cpp_lib_bitops): Define.
	* include/std/version (__cpp_lib_constexpr): Remove.
	(__cpp_lib_bitops, __cpp_lib_constexpr_dynamic_alloc): Define.
	* testsuite/26_numerics/bit/header.cc: New test.
	* testsuite/26_numerics/bit/header-2.cc: New test.
	* testsuite/20_util/allocator_traits/header.cc: New test.
	* testsuite/20_util/allocator_traits/header-2.cc: New test.

	* include/bits/stl_iterator.h (namespace __gnu_cxx): Remove
	using-declarations for std::iterator and std::iterator_traits.
	(__gnu_cxx::__normal_iterator): Qualify iterator_traits.
	* include/ext/algorithm (namespace __gnu_cxx): Remove
	using-declarations for std names and qualify those names when used.
	Also refer to std::min in parentheses to protect against function-like
	macros.
	* include/ext/rc_string_base.h: Qualify iterator_traits.
	* include/ext/sso_string_base.h: Qualify iterator_traits.

	PR libstdc++/92272
	* include/bits/stl_bvector.h (_Bit_iterator::pointer)
	(_Bit_const_iterator::pointer): Define as void for C++20.
	* include/bits/stl_iterator.h (reverse_iterator::operator->()): Add
	constraints for C++20.
	(__normal_iterator::iterator_concept): Define for C++20.
	* include/bits/streambuf_iterator.h (istreambuf_iterator::pointer):
	Define as void for C++20.
	(ostreambuf_iterator::difference_type): Define as ptrdiff_t for C++20.
	(ostreambuf_iterator::ostreambuf_iterator()): Add default constructor
	for C++20.
	* testsuite/23_containers/vector/bool/iterator_c++20.cc: New test.
	* testsuite/24_iterators/bidirectional/concept.cc: New test.
	* testsuite/24_iterators/bidirectional/tag.cc: New test.
	* testsuite/24_iterators/contiguous/concept.cc: New test.
	* testsuite/24_iterators/contiguous/tag.cc: New test.
	* testsuite/24_iterators/forward/concept.cc: New test.
	* testsuite/24_iterators/forward/tag.cc: New test.
	* testsuite/24_iterators/input/concept.cc: New test.
	* testsuite/24_iterators/input/tag.cc: New test.
	* testsuite/24_iterators/istreambuf_iterator/requirements/typedefs.cc:
	New test.
	* testsuite/24_iterators/ostreambuf_iterator/requirements/typedefs.cc:
	New test.
	* testsuite/24_iterators/output/concept.cc: New test.
	* testsuite/24_iterators/output/tag.cc: New test.
	* testsuite/24_iterators/random_access/concept.cc: New test.
	* testsuite/24_iterators/random_access/tag.cc: New test.
	* testsuite/24_iterators/range_operations/advance_debug_neg.cc: New
	test.
	* testsuite/24_iterators/random_access_iterator/26020.cc: Move to ...
	* testsuite/24_iterators/operations/26020.cc: ... here.
	* testsuite/24_iterators/random_access_iterator/
	string_vector_iterators.cc: Move to ...
	* testsuite/24_iterators/random_access/string_vector_iterators.cc: ...
	here.

	* testsuite/util/testsuite_iterators.h: Fix typo in __cplusplus check.

2019-10-29  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/range_access.h (ranges::disable_sized_range)
	(ranges::begin, ranges::end, ranges::cbegin, ranges::cend)
	(ranges::rbegin, ranges::rend, ranges::crbegin, ranges::crend)
	(ranges::size, ranges::empty, ranges::data, ranges::cdata)
	(ranges::range, ranges::sized_range, ranges::advance, ranges::distance)
	(ranges::next, ranges::prev): Guard with __cpp_lib_concepts.
	* include/bits/stl_iterator.h (disable_sized_sentinel): Likewise.

	* include/bits/alloc_traits.h (__cpp_lib_constexpr_dynamic_alloc):
	Define.
	(allocator_traits::_S_construct, allocator_traits::_S_destroy)
	(__alloc_on_copy, __alloc_on_move, __alloc_on_swap): Use
	_GLIBCXX14_CONSTEXPR instead of constexpr.
	* include/bits/stl_construct.h (_Destroy): Likewise.

	* include/Makefile.am: Add new header.
	* include/Makefile.in: Regenerate.
	* include/bits/iterator_concepts.h: New header.
	(contiguous_iterator_tag, iter_reference_t, ranges::iter_move)
	(iter_rvalue_reference_t, incrementable_traits, iter_difference_t)
	(readable_traits, iter_value_t, readable, iter_common_reference_t)
	(writable, waekly_incrementable, incrementable)
	(input_or_output_iterator, sentinel_for, disable_sized_sentinel)
	(sized_sentinel_for, input_iterator, output_iterator)
	(forward_iterator, bidirectional_iterator, random_access_iterator)
	(contiguous_iterator, indirectly_unary_invocable)
	(indirectly_regular_unary_invocable, indirect_unary_predicate)
	(indirect_relation, indirect_strict_weak_order, indirect_result_t)
	(projected, indirectly_movable, indirectly_movable_storable)
	(indirectly_copyable, indirectly_copyable_storable, ranges::iter_swap)
	(indirectly_swappable, indirectly_comparable, permutable, mergeable)
	(sortable, unreachable_sentinel_t, unreachable_sentinel)
	(default_sentinel_t, default_sentinel): Define.
	(__detail::__cpp17_iterator, __detail::__cpp17_input_iterator)
	(__detail::__cpp17_fwd_iterator, __detail::__cpp17_bidi_iterator)
	(__detail::__cpp17_randacc_iterator): Define.
	(__iterator_traits): Define constrained specializations.
	* include/bits/move.h (move): Only use old concept check for C++98.
	* include/bits/range_access.h (ranges::disable_sized_range)
	(ranges::begin, ranges::end, ranges::cbegin, ranges::cend)
	(ranges::rbegin, ranges::rend, ranges::crbegin, ranges::crend)
	(ranges::size, ranges::empty, ranges::data, ranges::cdata): Define
	new customization points for C++20.
	(ranges::range, ranges::sized_range): Define new concepts for C++20.
	(ranges::advance, ranges::distance, ranges::next, ranges::prev):
	Define new functions for C++20.
	(__adl_end, __adl_cdata, __adl_cbegin, __adl_cend, __adl_rbegin)
	(__adl_rend, __adl_crbegin, __adl_crend, __adl_cdata, __adl_size)
	(__adl_empty): Remove.
	* include/bits/stl_iterator.h (disable_sized_sentinel): Specialize
	for reverse_iterator.
	* include/bits/stl_iterator_base_types.h (contiguous_iterator_tag):
	Define new struct for C++20.
	(iterator_traits<_Tp*>): Constrain partial specialization in C++20.
	* include/std/concepts (__is_class_or_enum): Move to __detail
	namespace.
	* testsuite/20_util/forward/c_neg.cc: Adjust dg-error line number.
	* testsuite/20_util/forward/f_neg.cc: Likewise.
	* testsuite/24_iterators/associated_types/incrementable.traits.cc: New
	test.
	* testsuite/24_iterators/associated_types/readable.traits.cc: New test.
	* testsuite/24_iterators/contiguous/concept.cc: New test.
	* testsuite/24_iterators/contiguous/tag.cc: New test.
	* testsuite/24_iterators/customization_points/iter_move.cc: New test.
	* testsuite/24_iterators/customization_points/iter_swap.cc: New test.
	* testsuite/24_iterators/headers/iterator/synopsis_c++20.cc: New test.
	* testsuite/24_iterators/range_operations/advance.cc: New test.
	* testsuite/24_iterators/range_operations/distance.cc: New test.
	* testsuite/24_iterators/range_operations/next.cc: New test.
	* testsuite/24_iterators/range_operations/prev.cc: New test.
	* testsuite/26_numerics/adjacent_difference/requirements/
	explicit_instantiation/2.cc: Rename types that conflict with C++20
	concepts.
	* testsuite/26_numerics/adjacent_difference/requirements/
	explicit_instantiation/pod.cc: Likewise.
	* testsuite/26_numerics/partial_sum/requirements/
	explicit_instantiation/2.cc: Likewise.
	* testsuite/26_numerics/partial_sum/requirements/
	explicit_instantiation/pod.cc: Likewise.
	* testsuite/experimental/iterator/requirements.cc: Likewise.
	* testsuite/std/ranges/access/begin.cc: New test.
	* testsuite/std/ranges/access/cbegin.cc: New test.
	* testsuite/std/ranges/access/cdata.cc: New test.
	* testsuite/std/ranges/access/cend.cc: New test.
	* testsuite/std/ranges/access/crbegin.cc: New test.
	* testsuite/std/ranges/access/crend.cc: New test.
	* testsuite/std/ranges/access/data.cc: New test.
	* testsuite/std/ranges/access/empty.cc: New test.
	* testsuite/std/ranges/access/end.cc: New test.
	* testsuite/std/ranges/access/rbegin.cc: New test.
	* testsuite/std/ranges/access/rend.cc: New test.
	* testsuite/std/ranges/access/size.cc: New test.
	* testsuite/util/testsuite_iterators.h (contiguous_iterator_wrapper)
	(test_range, test_sized_range): New test utilities.

	* testsuite/util/testsuite_iterators.h (BoundsContainer::size()): Add
	new member function.
	(WritableObject::operator=): Constrain with enable_if when available.
	(remove_cv): Use std::remove_if when available.
	(test_container::it(int)): Use size().
	(test_container::size()): Use BoundsContainer::size().

	PR libstdc++/92267
	* include/bits/stl_deque.h (_Deque_iterator(const _Deque_iterator&)):
	Do not define as defaulted.
	* testsuite/23_containers/deque/types/92267.cc: New test.

2019-10-26  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/codecvt.xml: Switch pubs.opengroup.org to https.
	* doc/xml/manual/locale.xml (LC_ALL): Ditto.
	* doc/xml/manual/messages.xml: Ditto.

2019-10-26  John David Anglin  <danglin@gcc.gnu.org>

	* config/abi/post/hppa-linux-gnu/baseline_symbols.txt: Update.

2019-10-25  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/util/testsuite_iterators.h (output_iterator_wrapper)
	(input_iterator_wrapper, forward_iterator_wrapper)
	bidirectional_iterator_wrapper, random_access_iterator_wrapper): Remove
	user-provided copy constructors and copy assignment operators so they
	are defined implicitly.
	(input_iterator_wrapper): Initialize members in default constructor.
	(forward_iterator_wrapper): Remove assignments to members of base.

	* include/bits/allocator.h: Check __cpp_constexpr_dynamic_alloc
	before making the std::allocator destructor constexpr.
	* testsuite/20_util/allocator/requirements/constexpr.cc: New test.

	* include/bits/range_cmp.h: Check __cpp_lib_concepts before defining
	concepts. Fix comment.
	* include/bits/allocator.h 

2019-10-25  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/policy_data_structures_biblio.xml: Switch
	pubs.opengroup.org to https.

2019-10-25  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/gnu/gpl-3.0.xml: Switch www.gnu.org to https.

2019-09-09  Edward Smith-Rowland  <3dw4rd@verizon.net>

	* doc/xml/manual/status_cxx2020.xml: Add rows and update status.

2019-10-24  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/allocator.h (allocator<void>): Restore the explicit
	specialization for C++20, but make its API consistent with the primary
	template.
	(allocator::~allocator()): Restore the destructor for C++20, but make
	it constexpr.
	* testsuite/20_util/allocator/rebind_c++20.cc: Check allocator<void>.
	* testsuite/20_util/allocator/requirements/typedefs_c++20.cc: Likewise.
	* testsuite/20_util/allocator/void.cc: Check that constructors and
	destructors are trivial. Check for converting constructor in C++20.
	* testsuite/ext/malloc_allocator/variadic_construct.cc: Simplify
	dejagnu target selector.
	* testsuite/ext/new_allocator/variadic_construct.cc: Likewise.

	* include/experimental/executor (__use_future_ct, use_future_t):
	Define partial specializations for std::allocator.
	(__use_future_ch): Overload constructor for completion tokens using
	std::allocator.

	PR libstdc++/88338 Implement P0898R3, C++20 concepts library
	* doc/xml/manual/status_cxx2020.xml: Update status.
	* doc/html/*: Regenerate.
	* testsuite/std/concepts/1.cc: New test.
	* testsuite/std/concepts/2.cc: New test.

	* include/bits/random.h (uniform_random_bit_generator): Define for
	C++20.
	* testsuite/26_numerics/random/concept.cc: New test.
	* testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error line.

2019-10-23  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/functional (invoke): Add constexpr for C++20.
	* include/std/version (__cpp_lib_constexpr_invoke): Define.
	* testsuite/20_util/function_objects/invoke/constexpr.cc: New test.

	PR c++/91369 Implement P0784R7 changes to allocation and construction
	* include/bits/alloc_traits.h: Include <bits/stl_construct.h>.
	(allocator_traits::_S_allocate, allocator_traits::_S_construct)
	(allocator_traits::_S_destroy, allocator_traits::_S_max_size)
	(allocator_traits::_S_select, allocator_traits::allocate)
	(allocator_traits::deallocate, allocator_traits::construct)
	(allocator_traits::destroy, allocator_traits::max_size)
	(allocator_traits::select_on_container_copy_construction)
	(allocator_traits<allocator<T>>): Add constexpr specifier for C++20.
	(allocator_traits<allocator<T>>::construct): Use construct_at.
	(allocator_traits<allocator<T>>::destroy): Use destroy_at.
	(__alloc_on_copy, __alloc_on_move, __alloc_on_swap): Add constexpr
	specifier.
	(_Destroy(ForwardIterator, ForwardIterator, Alloc&))
	(_Destroy(ForwardIterator, ForwardIterator, allocator<T>&)): Move here
	from <bits/stl_construct.h>.
	* include/bits/allocator.h (allocator::~allocator): Remove for C++20.
	(allocator::allocate, allocate::deallocate): Define for C++20 and up.
	(operator==, operator!=): Add constexpr specifier for C++20.
	* include/bits/stl_construct.h: Don't include <ext/alloc_traits.h>.
	(destroy_at): For C++20 add constexpr specifier and support for
	destroying arrays.
	(construct_at): Define new function for C++20.
	(_Construct): Return result of placement new-expression. For C++11 and
	up add constexpr. For C++20 dispatch to std::construct_at during
	constant evaluation.
	(_Destroy(pointer)): Add constexpr specifier. For C++20 dispatch to
	std::destroy_at during constant evaluation.
	(_Destroy_aux::__destroy, _Destroy_n_aux::__destroy_n): Add constexpr
	specifier for C++20.
	(_Destroy(ForwardIterator, ForwardIterator))
	(_Destroy(ForwardIterator, Size)): Likewise. Do not elide trivial
	destructors during constant evaluation.
	(destroy, destroy_n): Add constexpr specifier for C++20.
	(_Destroy(ForwardIterator, ForwardIterator, Alloc&))
	(_Destroy(ForwardIterator, ForwardIterator, allocator<T>&)): Move to
	<bits/alloc_traits.h>, to remove dependency on allocators.
	* include/bits/stl_uninitialized.h: Include <ext/alloc_traits.h>.
	Include <bits/stl_pair.h> instead of <utility>.
	* include/ext/alloc_traits.h: Always include <bits/alloc_traits.h>.
	(__alloc_traits::construct, __alloc_traits::destroy)
	(__alloc_traits::_S_select_on_copy, __alloc_traits::_S_on_swap): Add
	constexpr specifier.
	* include/ext/malloc_allocator.h  (operator==, operator!=): Add
	constexpr specifier for C++20.
	* include/ext/new_allocator.h (operator==, operator!=): Likewise.
	* testsuite/20_util/headers/memory/synopsis.cc: Add constexpr.
	* testsuite/20_util/scoped_allocator/69293_neg.cc: Ignore additional
	errors due to constexpr function called after failed static_assert.
	* testsuite/20_util/specialized_algorithms/construct_at/1.cc: New test.
	* testsuite/23_containers/vector/cons/destructible_debug_neg.cc:
	Ignore additional errors due to constexpr function called after failed
	static_assert.
	* testsuite/23_containers/vector/cons/destructible_neg.cc: Likewise.

	* testsuite/20_util/bind/91371.cc: Fix test to compile as C++11.

	* include/debug/helper_functions.h (__valid_range): Change
	_GLIBCXX_CONSTEXPR to _GLIBCXX14_CONSTEXPR.

	* include/ext/throw_allocator.h (throw_allocator_base): Qualify
	size_t and ptrdiff_t.

	* include/ext/pb_ds/detail/bin_search_tree_/bin_search_tree_.hpp:
	Use detail::rebind_traits.
	* include/ext/pb_ds/detail/bin_search_tree_/node_iterators.hpp:
	Likewise.
	* include/ext/pb_ds/detail/bin_search_tree_/traits.hpp: Likewise.
	* include/ext/pb_ds/detail/binary_heap_/binary_heap_.hpp: Likewise.
	* include/ext/pb_ds/detail/binary_heap_/entry_cmp.hpp: Likewise.
	* include/ext/pb_ds/detail/binary_heap_/entry_pred.hpp: Likewise.
	* include/ext/pb_ds/detail/binary_heap_/point_const_iterator.hpp:
	Likewise.
	* include/ext/pb_ds/detail/binomial_heap_base_/binomial_heap_base_.hpp:
	Likewise.
	* include/ext/pb_ds/detail/branch_policy/branch_policy.hpp: Likewise.
	* include/ext/pb_ds/detail/cc_hash_table_map_/cc_ht_map_.hpp: Likewise.
	* include/ext/pb_ds/detail/cond_dealtor.hpp: Likewise.
	* include/ext/pb_ds/detail/eq_fn/hash_eq_fn.hpp (has_eq_fn): Likewise.
	* include/ext/pb_ds/detail/gp_hash_table_map_/gp_ht_map_.hpp: Likewise.
	* include/ext/pb_ds/detail/hash_fn/ranged_hash_fn.hpp: Likewise.
	* include/ext/pb_ds/detail/hash_fn/ranged_probe_fn.hpp: Likewise.
	* include/ext/pb_ds/detail/left_child_next_sibling_heap_/
	left_child_next_sibling_heap_.hpp: Likewise.
	* include/ext/pb_ds/detail/left_child_next_sibling_heap_/node.hpp:
	Likewise.
	* include/ext/pb_ds/detail/left_child_next_sibling_heap_/
	point_const_iterator.hpp: Likewise.
	* include/ext/pb_ds/detail/list_update_map_/lu_map_.hpp: Likewise.
	* include/ext/pb_ds/detail/ov_tree_map_/
	constructors_destructor_fn_imps.hpp: Likewise.
	* include/ext/pb_ds/detail/ov_tree_map_/node_iterators.hpp: Likewise.
	* include/ext/pb_ds/detail/ov_tree_map_/ov_tree_map_.hpp: Likewise.
	* include/ext/pb_ds/detail/pairing_heap_/pairing_heap_.hpp: Likewise.
	* include/ext/pb_ds/detail/pat_trie_/pat_trie_.hpp: Likewise.
	* include/ext/pb_ds/detail/pat_trie_/pat_trie_base.hpp: Likewise.
	* include/ext/pb_ds/detail/rb_tree_map_/node.hpp: Likewise.
	* include/ext/pb_ds/detail/rc_binomial_heap_/rc.hpp: Likewise.
	* include/ext/pb_ds/detail/splay_tree_/node.hpp: Likewise.
	* include/ext/pb_ds/detail/thin_heap_/thin_heap_.hpp: Likewise.
	* include/ext/pb_ds/detail/trie_policy/sample_trie_access_traits.hpp:
	Likewise.
	* include/ext/pb_ds/detail/type_utils.hpp: Fix typo in comment.
	* include/ext/pb_ds/detail/types_traits.hpp (stored_value): Add
	bool parameter to control whether the hash value is stored.
	(select_base_type): New class template and partial specialization.
	(maybe_null_type): Likewise.
	(rebind_traits): New class template.
	(type_base): Remove four nearly identical specializations.
	(type_dispatch): Remove.
	(type_traits): Use select_base_type and maybe_null_type instead of
	type_base to control differences between specializations.
	* include/ext/pb_ds/list_update_policy.hpp: Use detail::rebind_traits.
	* include/ext/pb_ds/priority_queue.hpp: Likewise.
	* include/ext/pb_ds/tree_policy.hpp: Likewise.
	* include/ext/pb_ds/trie_policy.hpp: Likewise.

	* include/backward/hash_set (hash_set): Use __alloc_traits.
	* include/backward/hashtable.h (_Hashtable): Likewise.
	* include/ext/alloc_traits.h (__alloc_traits::allocate): Add overload
	taking a hint.
	* include/ext/extptr_allocator.h (_ExtPtr_allocator::allocate): Ignore
	hint.
	* include/ext/slist (_Slist_base): Use __alloc_traits.
	* include/tr1/hashtable.h (_Hashtable): Likewise.
	* include/tr1/regex (match_results): Use vector::const_reference
	instead of assuming the allocator defines it.
	* testsuite/backward/hash_map/23528.cc: Use allocator_traits in C++11.
	* testsuite/tr1/6_containers/unordered_map/capacity/29134-map.cc: Use
	__gnu_test::max_size.
	* testsuite/tr1/6_containers/unordered_multimap/capacity/
	29134-multimap.cc: Likewise.
	* testsuite/tr1/6_containers/unordered_multiset/capacity/
	29134-multiset.cc: Likewise.
	* testsuite/tr1/6_containers/unordered_set/capacity/29134-set.cc:
	Likewise.

2019-10-22  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/util/testsuite_abi.h: Restore use of tr1/unordered_map
	when compiled as C++98.

	* include/bits/memoryfwd.h (uses_allocator): Do not declare for C++98.
	* testsuite/17_intro/names.cc: Check uses_allocator in C++98.

	* include/bits/alloc_traits.h
	(allocator_traits<allocator<T>>::allocate): Ignore hint for C++20.
	(allocator_traits<allocator<T>>::construct): Perform placement new
	directly for C++20, instead of calling allocator<T>::construct.
	(allocator_traits<allocator<T>>::destroy): Call destructor directly
	for C++20, instead of calling allocator<T>::destroy.
	(allocator_traits<allocator<T>>::max_size): Return value directly
	for C++20, instead of calling std::allocator<T>::max_size().
	(__do_alloc_on_copy, __do_alloc_on_move, __do_alloc_on_swap): Do not
	define for C++17 and up.
	(__alloc_on_copy, __alloc_on_move, __alloc_on_swap): Use if-constexpr
	for C++17 and up, instead of tag dispatching.
	* include/bits/allocator.h (allocator<void>): Remove for C++20.
	(allocator::pointer, allocator::const_pointer, allocator::reference)
	(allocator::const_reference, allocator::rebind): Remove for C++20.
	* include/bits/basic_string.h (basic_string): Use __alloc_traits to
	rebind allocator.
	* include/bits/memoryfwd.h (allocator<void>): Remove for C++20.
	* include/ext/debug_allocator.h: Use __alloc_traits for rebinding.
	* include/ext/malloc_allocator.h (malloc_allocator::~malloc_allocator)
	(malloc_allocator::pointer, malloc_allocator::const_pointer)
	(malloc_allocator::reference, malloc_allocator::const_reference)
	(malloc_allocator::rebind, malloc_allocator::max_size)
	(malloc_allocator::construct, malloc_allocator::destroy): Do not
	define for C++20.
	(malloc_allocator::_M_max_size): Define new function.
	* include/ext/new_allocator.h (new_allocator::~new_allocator)
	(new_allocator::pointer, new_allocator::const_pointer)
	(new_allocator::reference, new_allocator::const_reference)
	(new_allocator::rebind, new_allocator::max_size)
	(new_allocator::construct, new_allocator::destroy): Do not
	define for C++20.
	(new_allocator::_M_max_size): Define new function.
	* include/ext/rc_string_base.h (__rc_string_base::_Rep): Use
	__alloc_traits to rebind allocator.
	* include/ext/rope (_Rope_rep_base, _Rope_base): Likewise.
	(rope::rope(CharT, const allocator_type&)): Use __alloc_traits
	to construct character.
	* include/ext/slist (_Slist_base): Use __alloc_traits to rebind
	allocator.
	* include/ext/sso_string_base.h (__sso_string_base::_M_max_size):
	Use __alloc_traits.
	* include/ext/throw_allocator.h (throw_allocator): Do not use optional
	members of std::allocator, use __alloc_traits members instead.
	* include/ext/vstring.h (__versa_string): Use __alloc_traits.
	* include/ext/vstring_util.h (__vstring_utility): Likewise.
	* include/std/memory: Include <bits/alloc_traits.h>.
	* testsuite/20_util/allocator/8230.cc: Use __gnu_test::max_size.
	* testsuite/20_util/allocator/rebind_c++20.cc: New test.
	* testsuite/20_util/allocator/requirements/typedefs.cc: Do not check
	for pointer, const_pointer, reference, const_reference or rebind in
	C++20.
	* testsuite/20_util/allocator/requirements/typedefs_c++20.cc: New test.
	* testsuite/23_containers/deque/capacity/29134.cc: Use
	__gnu_test::max_size.
	* testsuite/23_containers/forward_list/capacity/1.cc: Likewise.
	* testsuite/23_containers/list/capacity/29134.cc: Likewise.
	* testsuite/23_containers/map/capacity/29134.cc: Likewise.
	* testsuite/23_containers/multimap/capacity/29134.cc: Likewise.
	* testsuite/23_containers/multiset/capacity/29134.cc: Likewise.
	* testsuite/23_containers/set/capacity/29134.cc: Likewise.
	* testsuite/23_containers/vector/capacity/29134.cc: Likewise.
	* testsuite/ext/malloc_allocator/variadic_construct.cc: Do not run
	test for C++20.
	* testsuite/ext/new_allocator/variadic_construct.cc: Likewise.
	* testsuite/ext/vstring/capacity/29134.cc: Use __gnu_test::max_size.
	* testsuite/util/replacement_memory_operators.h: Do not assume
	Alloc::pointer exists.
	* testsuite/util/testsuite_allocator.h (__gnu_test::max_size): Define
	helper to call max_size for any allocator.

2019-10-22  Andreas Schwab  <schwab@suse.de>

	* config/abi/post/aarch64-linux-gnu/baseline_symbols.txt: Update.

2019-10-18  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/92143
	* libsupc++/new_opa.cc (operator new) [__APPLE__]: Increase alignment
	to at least sizeof(void*).

	* include/bits/range_cmp.h (ranges::less::operator()): Inline the
	logic from std::less::operator() to remove the dependency on it.

2019-10-17  Jonathan Wakely  <jwakely@redhat.com>

	* doc/doxygen/user.cfg.in (INPUT): Add new C++17 and C++20 headers.

	* include/Makefile.am: Add new header.
	* include/Makefile.in: Regenerate.
	* include/bits/range_cmp.h: New header for C++20 function objects.
	* include/std/functional: Include new header.
	* testsuite/20_util/function_objects/identity/1.cc: New test.
	* testsuite/20_util/function_objects/range.cmp/equal_to.cc: New test.
	* testsuite/20_util/function_objects/range.cmp/greater.cc: New test.
	* testsuite/20_util/function_objects/range.cmp/greater_equal.cc: New
	test.
	* testsuite/20_util/function_objects/range.cmp/less.cc: New test.
	* testsuite/20_util/function_objects/range.cmp/less_equal.cc: New test.
	* testsuite/20_util/function_objects/range.cmp/not_equal_to.cc: New
	test.

	PR libstdc++/92124
	* include/bits/forward_list.h
	(_M_move_assign(forward_list&&, false_type)): Do not use
	__make_move_if_noexcept, instead move unconditionally.
	* include/bits/stl_deque.h (_M_move_assign2(deque&&, false_type)):
	Likewise.
	* include/bits/stl_list.h (_M_move_assign(list&&, false_type)):
	Likewise.
	* include/bits/stl_vector.h (_M_move_assign(vector&&, false_type)):
	Likewise.
	* testsuite/23_containers/vector/92124.cc: New test.

2019-10-16  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/c++config (_GLIBCXX_BUILTIN_IS_SAME_AS): Define to
	one of __is_same_as or __is_same when available.
	* include/std/concepts (__detail::__same_as): Use std::is_same_v.
	* include/std/type_traits (is_same) [_GLIBCXX_BUILTIN_IS_SAME_AS]:
	Use new macro instead of __is_same_as.
	(is_same) [!_GLIBCXX_BUILTIN_IS_SAME_AS]: Restore partial
	specialization.
	(is_same_v) [_GLIBCXX_BUILTIN_IS_SAME_AS]: Use new macro.
	(is_same_v) [!_GLIBCXX_BUILTIN_IS_SAME_AS]: Use std::is_same.

2019-10-16  François Dumont  <fdumont@gcc.gnu.org>

	* src/c++11/debug.cc (print_field): Replace constness_names <unknown>
	entry with <unknown constness>. Replace state_names <unknown> entry with
	<unknown state>.

2019-10-11  Jonathan Wakely  <jwakely@redhat.com>

	* include/Makefile.am: Add new header.
	* include/Makefile.in: Regenerate.
	* include/precompiled/stdc++.h: Include <concepts>.
	* include/std/concepts: New header for C++20.
	* include/std/version (__cpp_lib_concepts): Define.
	* scripts/create_testsuite_files: Look for test files in new std
	directory.
	* testsuite/libstdc++-dg/conformance.exp: Likewise.
	* testsuite/std/concepts/concepts.callable/invocable.cc: New test.
	* testsuite/std/concepts/concepts.callable/regular_invocable.cc: New
	test.
	* testsuite/std/concepts/concepts.callable/relation.cc: New test.
	* testsuite/std/concepts/concepts.callable/strictweakorder.cc: New
	test.
	* testsuite/std/concepts/concepts.lang/concept.arithmetic/
	floating_point.cc: New test.
	* testsuite/std/concepts/concepts.lang/concept.arithmetic/integral.cc:
	New test.
	* testsuite/std/concepts/concepts.lang/concept.arithmetic/
	signed_integral.cc: New test.
	* testsuite/std/concepts/concepts.lang/concept.arithmetic/
	unsigned_integral.cc: New test.
	* testsuite/std/concepts/concepts.lang/concept.assignable/1.cc: New
	test.
	* testsuite/std/concepts/concepts.lang/concept.common/1.cc: New test.
	* testsuite/std/concepts/concepts.lang/concept.commonref/1.cc: New
	test.
	* testsuite/std/concepts/concepts.lang/concept.constructible/1.cc:
	New test.
	* testsuite/std/concepts/concepts.lang/concept.convertible/1.cc:
	New test.
	* testsuite/std/concepts/concepts.lang/concept.copyconstructible/1.cc:
	New test.
	* testsuite/std/concepts/concepts.lang/concept.defaultconstructible/
	1.cc: New test.
	* testsuite/std/concepts/concepts.lang/concept.derived/1.cc:
	New test.
	* testsuite/std/concepts/concepts.lang/concept.destructible/1.cc:
	New test.
	* testsuite/std/concepts/concepts.lang/concept.moveconstructible/1.cc:
	New test.
	* testsuite/std/concepts/concepts.lang/concept.same/1.cc:
	New test.
	* testsuite/std/concepts/concepts.lang/concept.swappable/swap.cc:
	New test.
	* testsuite/std/concepts/concepts.lang/concept.swappable/swappable.cc:
	New test.
	* testsuite/std/concepts/concepts.lang/concept.swappable/
	swappable_with.cc: New test.
	* testsuite/std/concepts/concepts.object/copyable.cc: New test.
	* testsuite/std/concepts/concepts.object/movable.cc: New test.
	* testsuite/std/concepts/concepts.object/regular.cc: New test.
	* testsuite/std/concepts/concepts.object/semiregular.cc: New test.

	* include/std/type_traits (is_same): Replace partial specialization
	by using __is_same_as built-in in primary template.
	(is_same_v): Use __is_same_as built-in instead of instantiating the
	is_same trait.

	PR libstdc++/92059
	* include/tr2/dynamic_bitset (__dynamic_bitset_base): Define all
	special member functions as defaulted. Add noexcept to most members.
	(__dynamic_bitset_base(size_t, unsigned long long, const _Alloc&)):
	Mask off unwanted bits in the __val parameter. Avoid undefined left
	shifts.
	(__dynamic_bitset_base::_M_assign): Remove.
	(__dynamic_bitset_base::_M_do_reset): Use std::fill.
	(__dynamic_bitset_base::_M_are_all_aux): Avoid integer promotion when
	block_type has lower rank than int.
	(dynamic_bitset): Add noexcept to most members. Use injected-class-name
	in return types and parameter types.
	(dynamic_bitset::_M_Nb): Add default member initializer.
	(dynamic_bitset(), dynamic_bitset(const dynamic_bitset&)): Define as
	defaulted.
	(dynamic_bitset(dynamic_bitset&&)): Clear source object after move.
	(dynamic_bitset::operator=(const dynamic_bitset&)): Define as
	defaulted.
	(dynamic_bitset::operator=(dynamic_bitset&&)): Add noexcept-specifier.
	Define without using swap, to propagate allocator correctly.
	(dynamic_bitset(const char*, const _Alloc&)): Use strlen.
	(dynamic_bitset::_M_do_sanitize, dynamic_bitset::_M_do_fill): Use
	casts to avoid unwanted integer promotions.
	(dynamic_bitset::_M_copy_from_ptr): Rearrange template parameters and
	add default template arguments and default argument to simplify usage.
	(dynamic_bitset::_M_copy_from_string): Adjust call to _M_copy_from_ptr.
	(operator==(const dynamic_bitset&, const dynamic_bitset&))
	(operator<(const dynamic_bitset&, const dynamic_bitset&)): Use _M_Nb.
	* include/tr2/dynamic_bitset.tcc (dynamic_bitset::_M_copy_from_ptr):
	Adjust template parameters to match declaration.
	* testsuite/tr2/dynamic_bitset/cmp.cc: New test.
	* testsuite/tr2/dynamic_bitset/cons.cc: New test.
	* testsuite/tr2/dynamic_bitset/copy.cc: New test.
	* testsuite/tr2/dynamic_bitset/move.cc: New test.
	* testsuite/tr2/dynamic_bitset/pr92059.cc: New test.

	* include/bits/charconv.h (__to_chars_len): Avoid -Wsign-compare
	warnings.

2019-10-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/91057
	* src/c++98/locale.cc [_GLIBCXX_LONG_DOUBLE_COMPAT]
	(find_ldbl_sync_facet): Fix parameter type and missing return.

2019-10-09  Marek Polacek  <polacek@redhat.com>

	PR c++/91364 - P0388R4: Permit conversions to arrays of	unknown bound.
	PR c++/69531 - DR 1307: Differently bounded array parameters.
	PR c++/88128 - DR 330: Qual convs and pointers to arrays of pointers.
	* testsuite/23_containers/span/lwg3255.cc: Adjust test to match the
	post-P0388R4 behavior.

2019-10-09  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/91057
	* src/c++98/locale.cc (locale::id::_M_id()) [__GTHREADS]: Use atomic
	compare-exchange or double-checked lock to ensure only one thread sets
	the _M_index variable.
	[_GLIBCXX_LONG_DOUBLE_COMPAT]: Call find_ldbl_sync_facet to detect
	facets that share another facet's ID.
	[_GLIBCXX_LONG_DOUBLE_COMPAT] (find_ldbl_sync_facet): New function.

	PR libstdc++/78552
	* src/c++98/locale_init.cc (locale::classic()): Do not construct a new
	locale object for every call.
	(locale::_S_initialize_once()): Construct C locale here.

2019-10-08  Jonathan Wakely  <jwakely@redhat.com>

	* doc/Makefile.am (doc-html-docbook-regenerate): New target.
	(${docbook_outdir}/html): Do not create unused 'html/ext' directory.
	* doc/Makefile.in: Regenerate.
	* doc/xml/manual/documentation_hacking.xml: Document new target.
	* doc/html/*: Regenerate.

	* doc/xml/manual/allocator.xml: Use archived copy of CUJ article.
	* doc/html/*: Regenerate.

2019-10-06  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/stl_algo.h
	(__copy_n_a(_IIte, _Size, _OIte)): New.
	(__copy_n_a(istreambuf_iterator<>, _Size, _CharT*)): New declaration.
	(__copy_n(_IIte, _Size, _OIte, input_iterator_tag)): Adapt to use
	latter.
	* include/bits/streambuf_iterator.h (istreambuf_iterator<>): Declare
	std::__copy_n_a friend.
	(__copy_n_a(istreambuf_iterator<>, _Size, _CharT*)): New.
	* testsuite/25_algorithms/copy_n/istreambuf_iterator/1.cc: New.
	* testsuite/25_algorithms/copy_n/istreambuf_iterator/1_neg.cc: New.
	* testsuite/25_algorithms/copy_n/istreambuf_iterator/2_neg.cc: New.

	* include/bits/stl_iterator_base_types.h (__iterator_category_t): Define
	for C++11.
	(_RequireInputIte): Likewise and use __enable_if_t.
	* include/std/numeric
	(__is_random_access_iter): Use __iterator_category_t.

	* include/bits/stl_algo.h (copy_n): Add __glibcxx_requires_can_increment
	debug checks.
	* testsuite/25_algorithms/copy_n/debug/1_neg.cc: New.
	* testsuite/25_algorithms/copy_n/debug/2_neg.cc: New.

2019-10-04  François Dumont  <fdumont@gcc.gnu.org>

	* include/debug/forward_list
	(_Sequence_traits<__debug::forward_list<>>::_S_size): Returns __dp_sign
	distance when not empty.
	* include/debug/list (_Sequence_traits<__debug::list<>>::_S_size):
	Likewise.
	* include/debug/helper_functions.h (__dp_sign_max_size): New
	_Distance_precision enum entry.
	(__valid_range_aux(_IIte, _IIte, _Distance_traits<>::__type,
	__false_type)): Adapt.
	* include/debug/safe_iterator.tcc
	(_Safe_iterator<>::_M_get_distance_to(const _Safe_iterator&)): Review
	distance computation.

2019-10-04  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/81091
	PR libstdc++/91947
	* configure.ac: Use AC_SYS_LARGEFILE to enable 64-bit file APIs.
	* config.h.in: Regenerate:
	* configure: Regenerate:
	* include/Makefile.am (${host_builddir}/largefile-config.h): New
	target to generate config header for filesystem library.
	(${host_builddir}/c++config.h): Rename macros for large file support.
	* include/Makefile.in: Regenerate.
	* src/c++17/fs_dir.cc: Include new config header.
	* src/c++17/fs_ops.cc: Likewise.
	(filesystem::file_size): Use uintmax_t for size.
	* src/filesystem/dir.cc: Include new config header.
	* src/filesystem/ops.cc: Likewise.
	(experimental::filesystem::file_size): Use uintmax_t for size.

	* testsuite/util/testsuite_abi.h: Use std::unordered_map instead of
	std::tr1::unordered_map.
	* testsuite/util/testsuite_allocator.h: Likewise.

	* include/tr1/hashtable.h: Add header for __gnu_cxx::__alloc_traits.

	* include/tr1/hashtable.h (tr1::_Hashtable::_M_allocate_node): Use
	__gnu_cxx::__alloc_traits for allocator construct function.
	(tr1::_Hashtable::_M_deallocate_node): Likewise for destroy function.

	* include/precompiled/stdc++.h: Include <span> for C++20.
	* testsuite/17_intro/names.cc: Do not define 'e' for C++20.

2019-10-03  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* include/parallel/multiway_merge.h (_RAIter3): Replace _C by _Cp.

2019-10-02  Jonathan Wakely  <jwakely@redhat.com>

	* config/abi/pre/gnu.ver: Tighten up greedy wildcards.

	* doc/xml/manual/parallel_mode.xml: Add caveat about support for
	recent standards.
	* doc/html/*: Regenerate.

2019-10-01  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/algorithm (experimental::sample): Qualify call
	to __sample correctly.
	* include/parallel/algo.h (sample, for_each_n): Add using-declarations
	for algorithms that don't have parallel implementations.

	* include/parallel/algobase.h (equal, lexicographical_compare): Add
	_GLIBCXX20_CONSTEXPR and dispatch to sequential algorithm when being
	constant evaluated.
	* include/parallel/algorithmfwd.h (equal, lexicographical_compare):
	Add _GLIBCXX20_CONSTEXPR.

	* testsuite/17_intro/using_namespace_std_tr1_neg.cc: Skip test for
	parallel mode.
	* testsuite/20_util/hash/84998.cc: Likewise.
	* testsuite/23_containers/deque/types/pmr_typedefs_debug.cc: Likewise.
	* testsuite/23_containers/forward_list/pmr_typedefs_debug.cc: Likewise.
	* testsuite/23_containers/list/pmr_typedefs_debug.cc: Likewise.
	* testsuite/23_containers/map/pmr_typedefs_debug.cc: Likewise.
	* testsuite/23_containers/multimap/pmr_typedefs_debug.cc: Likewise.
	* testsuite/23_containers/multiset/pmr_typedefs_debug.cc: Likewise.
	* testsuite/23_containers/set/pmr_typedefs_debug.cc: Likewise.
	* testsuite/23_containers/unordered_map/pmr_typedefs_debug.cc:
	Likewise.
	* testsuite/23_containers/unordered_multimap/pmr_typedefs_debug.cc:
	Likewise.
	* testsuite/23_containers/unordered_multiset/pmr_typedefs_debug.cc:
	Likewise.
	* testsuite/23_containers/unordered_set/pmr_typedefs_debug.cc:
	Likewise.
	* testsuite/23_containers/vector/cons/destructible_debug_neg.cc:
	Likewise.
	* testsuite/23_containers/vector/types/pmr_typedefs_debug.cc: Likewise.
	* testsuite/25_algorithms/binary_search/partitioned.cc: Likewise.
	* testsuite/25_algorithms/copy/86658.cc: Likewise.
	* testsuite/25_algorithms/equal_range/partitioned.cc: Likewise.
	* testsuite/25_algorithms/lexicographical_compare/71545.cc: Likewise.
	* testsuite/25_algorithms/lower_bound/partitioned.cc: Likewise.
	* testsuite/25_algorithms/upper_bound/partitioned.cc: Likewise.

	* include/parallel/algo.h: Replace non-reserved names.
	* include/parallel/multiway_merge.h: Likewise.
	* include/parallel/multiway_mergesort.h: Likewise.
	* include/parallel/numericfwd.h: Likewise.
	* testsuite/17_intro/names.cc: Add RAI to test macros.

2019-09-30  François Dumont  <fdumont@gcc.gnu.org>

	* include/debug/array: Add C++20 constexpr to comparison operators.
	* testsuite/23_containers/array/tuple_interface/get_debug_neg.cc: Adapt
	dg-error line numbers.
	* testsuite/23_containers/array/tuple_interface/
	tuple_element_debug_neg.cc: Likewise.

2019-09-30  Andreas Tobler  <andreast@gcc.gnu.org>

	* include/experimental/internet: Include netinet/in.h if we have
	_GLIBCXX_HAVE_NETINET_IN_H defined.

	* testsuite/ext/special_functions/airy_ai/check_nan.cc: Ignore the
	FreeBSD warning about lower advertised precision of tgammal.
	* testsuite/ext/special_functions/airy_bi/check_nan.cc: Likewise.
	* testsuite/special_functions/07_cyl_bessel_i/check_nan.cc: Likewise.
	* testsuite/special_functions/08_cyl_bessel_j/check_nan.cc: Likewise.
	* testsuite/special_functions/09_cyl_bessel_k/check_nan.cc: Likewise.
	* testsuite/special_functions/10_cyl_neumann/check_nan.cc: Likewise.
	* testsuite/special_functions/19_sph_bessel/check_nan.cc: Likewise.
	* testsuite/special_functions/21_sph_neumann/check_nan.cc: Likewise.
	* testsuite/tr1/5_numerical_facilities/special_functions/
	08_cyl_bessel_i/check_nan.cc: Likewise.
	* testsuite/tr1/5_numerical_facilities/special_functions/
	09_cyl_bessel_j/check_nan.cc: Likewise.
	* testuite/tr1/5_numerical_facilities/special_functions/
	10_cyl_bessel_k/check_nan.cc: Likewise.
	* testsuite/tr1/5_numerical_facilities/special_functions/
	11_cyl_neumann/check_nan.cc: Likewise.
	* testsuite/tr1/5_numerical_facilities/special_functions/
	21_sph_bessel/check_nan.cc: Likewise.
	* testsuite/tr1/5_numerical_facilities/special_functions/
	23_sph_neumann/check_nan.cc: Likewise.

2019-09-30  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/span (span(element_type(&)[N]))
	(span(array<value_type, N>&), span(const array<value_type, N>&)):
	Deduce array element type to allow safe const conversions (LWG 3255).
	[!_GLIBCXX_P1394] (span(Container&), span(const Container&)): Use
	remove_cv_t on arguments to __is_std_span and __is_std_array.
	* testsuite/23_containers/span/lwg3255.cc: New test.

	PR libstdc++/77936
	* include/parallel/checkers.h (__is_sorted): Remove unused variable.

2019-09-28  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/stl_algo.h (merge): Fix documentation.
	* include/debug/functions.h (__check_sorted_aux): Add C++20 constexpr.
	(__check_sorted): Likewise and remove nested irreflexive check.
	(__check_sorted_set_aux, __check_sorted_set): Add C++20 constexpr.
	(__check_partitioned_lower, __check_partitioned_upper): Likewise.
	(_Irreflexive_checker::_S_is_valid): Likewise.
	(__is_irreflexive, __is_irreflexive_pred): Likewise.
	* include/debug/helper_functions.h (__get_distance): Add constexpr.
	(__valid_range_aux): Add C++20 constexpr.
	(__valid_range(_Iter, _Iter, _Distance_traits<_Iter>::__type&)):
	Likewise and add std::is_constant_evaluated check.
	(__valid_range_aux(_Iter, _Iter, std::input_iterator_tag)): New.
	(__valid_range_aux(_Iter, _Iter, std::random_accss_iterator_tag)): New.
	(__valid_range_aux(_Integral, _Integral, std::__true_type)): New,
	use latter.
	(__valid_range(_Iter, _Iter)): Adapt to use latter, add constexpr and
	__builtin_is_contant_evaludated check..
	(__can_advance, __base): Add constexpr.
	* include/debug/macros.h [_GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED]
	(_GLIBCXX_DEBUG_VERIFY_COND_AT): New.
	(__glibcxx_check_sorted): Use __glibcxx_check_irreflexive.
	(__glibcxx_check_sorted_pred): Use __glibcxx_check_irreflexive_pred.
	* testsuite/25_algorithms/binary_search/constexpr.cc: Use irreflexive
	std::less.
	* testsuite/25_algorithms/is_sorted/constexpr.cc: Likewise.
	* testsuite/25_algorithms/merge/constexpr.cc: Fix order in camm. Fix
	lambda to be irreflexive.

2019-09-27  Maciej W. Rozycki  <macro@wdc.com>

	* configure: Regenerate.

2019-09-27  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/91910
	* src/c++11/debug.cc (_Safe_iterator_base::_M_detach()): Load pointer
	atomically and lock the mutex before accessing the sequence.
	(_Safe_local_iterator_base::_M_detach()): Likewise.
	(_Safe_iterator_base::_M_reset()): Clear _M_sequence atomically.

2019-09-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/debug/array (to_array): Define for debug mode.

	* include/bits/stl_pair.h (pair): Add _GLIBCXX20_CONSTEXPR to
	piecewise construction constructor, assignment operators, and swap.
	* include/std/tuple (pair::pair(piecewise_construct_t, tuple, tuple)):
	Add _GLIBCXX20_CONSTEXPR.
	(pair::pair(tuple, tuple, _Index_tuple, _Index_tuple)): Likewise.
	* testsuite/20_util/pair/constexpr_assign.cc: New test.
	* testsuite/20_util/pair/constexpr_swap.cc: New test.

	* include/experimental/internet (operator==, operator<): Fix loop
	condition to avoid reading past the end of the array.

	* include/std/array: Remove references to profile mode.
	* include/std/bitset: Likewise.
	* include/std/deque: Likewise.
	* include/std/forward_list: Likewise.
	* include/std/list: Likewise.
	* include/std/map: Likewise.
	* include/std/set: Likewise.
	* include/std/unordered_map: Likewise.
	* include/std/unordered_set: Likewise.
	* include/std/vector: Likewise.
	* testsuite/17_intro/headers/c++1998/profile_mode.cc: New test.
	* testsuite/17_intro/headers/c++2011/profile_mode.cc: New test.

2019-09-25  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/regex.h
	(basic_regex::assign(const C*, size_t, flag_type)): Add default
	argument (LWG 3296).
	* testsuite/28_regex/basic_regex/assign/char/lwg3296.cc: New test.
	* testsuite/28_regex/basic_regex/assign/wchar_t/lwg3296.cc: New test.

2019-09-24  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/variant (variant::index()): Remove impossible case.

	PR libstdc++/91871
	* testsuite/util/testsuite_hooks.h
	(conversion::iterator_to_const_iterator()): Do not return an invalid
	iterator. Test direct-initialization and direct-list-initialization
	as well as implicit conversion.

2019-09-23  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/91788 (partial)
	* include/std/variant (variant::index()): Improve codegen for cases
	where conversion to size_t already works correctly.

2019-09-23  Andreas Schwab  <schwab@suse.de>

	* config/abi/post/riscv64-linux-gnu/baseline_symbols.txt: Update.

2019-09-12  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/91748
	* include/bits/stl_algo.h (for_each_n): Fix random access iterator
	case.
	* testsuite/25_algorithms/for_each/for_each_n.cc: Test with random
	access iterators.

2019-09-11  Jonathan Wakely  <jwakely@redhat.com>

	* python/libstdcxx/v6/xmethods.py (SharedPtrUseCountWorker.__call__):
	Fix syntax error.

	* testsuite/20_util/result_of/sfinae_friendly_1.cc: Add -Wno-volatile
	for C++2a and up. Define HAS_52748_FIXED and fix incorrect tests.
	* testsuite/tr1/3_function_objects/result_of.cc: Add -Wno-volatile
	for C++2a and up.

2019-09-10  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/type_traits (__do_common_type_impl): Implement
	additional COND-RES(CREF(D1), CRED(D2)) condition for C++20.
	(basic_common_reference, common_reference, common_reference_t): Define
	for C++20.
	* testsuite/20_util/common_reference/requirements/alias_decl.cc: New
	test.
	* testsuite/20_util/common_reference/requirements/
	explicit_instantiation.cc: New test.
	* testsuite/20_util/common_reference/requirements/typedefs.cc: New
	test.

	* include/std/charconv (to_chars): Rename to __to_chars_i. Define
	non-template overloads for each signed and unsigned integer type and
	char. Define deleted overload for bool (LWG 3266).
	* testsuite/20_util/to_chars/1_neg.cc: Remove.
	* testsuite/20_util/to_chars/3.cc: New test.
	* testsuite/20_util/to_chars/lwg3266.cc: New test.

2019-09-10  Christophe Lyon  <christophe.lyon@st.com>

	* acinclude.m4: Handle uclinux*.
	* configure: Regenerate.
	* configure.host: Handle uclinux*

2019-09-10  Christophe Lyon  <christophe.lyon@st.com>
	Mickaël Guêné <mickael.guene@st.com>

	* libsupc++/eh_personality.cc (get_ttype_entry): Add FDPIC
	support.

2019-09-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/91711
	* testsuite/23_containers/span/get_neg.cc: Avoid ambiguity due to
	0ul being a valid null pointer constant.

	* include/std/type_traits (__remove_cv_t): New alias template.
	(is_void, is_integral, is_floating_point, is_pointer)
	(is_member_object_pointer, is_member_function_pointer, is_null_pointer)
	(is_member_point), __is_signed_integer, __is_unsigned_integer)
	(__make_unsigned_selector, __make_signed_selector, remove_pointer)
	(__decay_selector): Use __remove_cv_t.
	(remove_cv): Add partial specializations for cv-qualified types.
	(__decay_t): New alias template.
	(__decay_and_strip, __common_type_impl, __result_of_impl): Use
	__decay_t.
	(__enable_if_t): Move earlier in the file.
	(_Require): Use __enable_if_t.
	(swap(T&, T&)): Use _Require.
	(swap(T(&)[N])): Use __enable_if_t.

2019-09-09  Edward Smith-Rowland  <3dw4rd@verizon.net>

	Implement C++20 p1424 - 'constexpr' feature macro concerns,
	Issue 3256 - Feature testing macro for constexpr algorithms,
	and Issue 3257 - Missing feature testing macro update from P0858.
	* include/std/version (__cpp_lib_constexpr_algorithms): Bump value.
	* include/bits/algorithmfwd.h: Ditto.
	* include/std/utility: Ditto.
	* testsuite/25_algorithms/constexpr_macro.cc: Ditto.
	* testsuite/25_algorithms/cpp_lib_constexpr.cc: New check for
	__cpp_lib_constexpr macro in <algorith>.
	* testsuite/20_util/exchange/constexpr.cc: Add check for
	__cpp_lib_constexpr macro in <utility>.
	* testsuite/25_algorithms/adjacent_find/constexpr.cc: Remove check for
	__cpp_lib_constexpr_algorithms.
	* testsuite/25_algorithms/all_of/constexpr.cc: Ditto.
	* testsuite/25_algorithms/any_of/constexpr.cc: Ditto.
	* testsuite/25_algorithms/binary_search/constexpr.cc: Ditto.
	* testsuite/25_algorithms/copy/constexpr.cc: Ditto.
	* testsuite/25_algorithms/copy_backward/constexpr.cc: Ditto.
	* testsuite/25_algorithms/copy_if/constexpr.cc: Ditto.
	* testsuite/25_algorithms/copy_n/constexpr.cc: Ditto.
	* testsuite/25_algorithms/count/constexpr.cc: Ditto.
	* testsuite/25_algorithms/count_if/constexpr.cc: Ditto.
	* testsuite/25_algorithms/equal/constexpr.cc: Ditto.
	* testsuite/25_algorithms/equal_range/constexpr.cc: Ditto.
	* testsuite/25_algorithms/fill/constexpr.cc: Ditto.
	* testsuite/25_algorithms/fill_n/constexpr.cc: Ditto.
	* testsuite/25_algorithms/find/constexpr.cc: Ditto.
	* testsuite/25_algorithms/find_end/constexpr.cc: Ditto.
	* testsuite/25_algorithms/find_first_of/constexpr.cc: Ditto.
	* testsuite/25_algorithms/find_if/constexpr.cc: Ditto.
	* testsuite/25_algorithms/find_if_not/constexpr.cc: Ditto.
	* testsuite/25_algorithms/for_each/constexpr.cc: Ditto.
	* testsuite/25_algorithms/generate/constexpr.cc: Ditto.
	* testsuite/25_algorithms/generate_n/constexpr.cc: Ditto.
	* testsuite/25_algorithms/is_heap/constexpr.cc: Ditto.
	* testsuite/25_algorithms/is_heap_until/constexpr.cc: Ditto.
	* testsuite/25_algorithms/is_partitioned/constexpr.cc: Ditto.
	* testsuite/25_algorithms/is_permutation/constexpr.cc: Ditto.
	* testsuite/25_algorithms/is_sorted/constexpr.cc: Ditto.
	* testsuite/25_algorithms/is_sorted_until/constexpr.cc: Ditto.
	* testsuite/25_algorithms/lexicographical_compare/constexpr.cc: Ditto.
	* testsuite/25_algorithms/lower_bound/constexpr.cc: Ditto.
	* testsuite/25_algorithms/merge/constexpr.cc: Ditto.
	* testsuite/25_algorithms/mismatch/constexpr.cc: Ditto.
	* testsuite/25_algorithms/none_of/constexpr.cc: Ditto.
	* testsuite/25_algorithms/partition_copy/constexpr.cc: Ditto.
	* testsuite/25_algorithms/partition_point/constexpr.cc: Ditto.
	* testsuite/25_algorithms/remove/constexpr.cc: Ditto.
	* testsuite/25_algorithms/remove_copy/constexpr.cc: Ditto.
	* testsuite/25_algorithms/remove_copy_if/constexpr.cc: Ditto.
	* testsuite/25_algorithms/remove_if/constexpr.cc: Ditto.
	* testsuite/25_algorithms/replace_copy/constexpr.cc: Ditto.
	* testsuite/25_algorithms/replace_copy_if/constexpr.cc: Ditto.
	* testsuite/25_algorithms/replace_if/constexpr.cc: Ditto.
	* testsuite/25_algorithms/reverse_copy/constexpr.cc: Ditto.
	* testsuite/25_algorithms/rotate_copy/constexpr.cc: Ditto.
	* testsuite/25_algorithms/search/constexpr.cc: Ditto.
	* testsuite/25_algorithms/search_n/constexpr.cc: Ditto.
	* testsuite/25_algorithms/set_difference/constexpr.cc: Ditto.
	* testsuite/25_algorithms/set_intersection/constexpr.cc: Ditto.
	* testsuite/25_algorithms/set_symmetric_difference/constexpr.cc: Ditto.
	* testsuite/25_algorithms/set_union/constexpr.cc: Ditto.
	* testsuite/25_algorithms/transform/constexpr.cc: Ditto.
	* testsuite/25_algorithms/unique/constexpr.cc: Ditto.
	* testsuite/25_algorithms/unique_copy/constexpr.cc: Ditto.
	* testsuite/25_algorithms/upper_bound/constexpr.cc: Ditto.

2019-09-09  Edward Smith-Rowland  <3dw4rd@verizon.net>

	Update docs for recent <span> and constexpr lib changes.
	* doc/xml/manual/status_cxx2020.xml: Update p0202r3, p0858r0, p0879r0,
	p1023r0, p1085r2 status.
	* doc/html/manual/status.html: Regenerate.

2019-09-09  Antony Polukhin  <antoshkka@gmail.com>

	* include/bits/charconv.h (__detail::__to_chars_10_impl): Replace
	final offsets with constants.

2019-09-09  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/range_access.h (__adl_to_address): Remove.
	* include/std/span (__is_base_derived_safe_convertible_v): Replace
	with span::__is_compatible.
	(__is_std_array_v): Replace with __is_std_array class template and
	partial specializations.
	(__is_std_array, __is_std_span): New class templates and partial
	specializations.
	(span::__is_compatible): New alias template for SFINAE constraints.
	(span::span(element_type (&)[N])): Remove redundant constraints. Do
	not use __adl_data to obtain a pointer.
	(span::span(array<value_type, N>&)): Likewise.
	(span::span(const array<value_type, N>&)): Likewise.
	[_GLIBCXX_P1394] (span::iter_reference_t, span::iterator_t)
	(span::iter_value_t, span::derived_from): New alias templates for
	SFINAE constraints, until the equivalents are supported in <concepts>
	and <iterator>.
	[_GLIBCXX_P1394] (span::__is_compatible_iterator): New alias template
	for SFINAE constraints.
	[_GLIBCXX_P1394] (span::is_compatible_range): New class template for
	SFINAE constraints.
	[_GLIBCXX_P1394] (span::span(Range&&)): Improve constraints.
	[_GLIBCXX_P1394] (span::span(ContiguousIterator, Sentinel)): Likewise.
	Use std::to_address instead of __adl_to_address.
	[_GLIBCXX_P1394] (span::span(ContiguousIterator, size_type)): Likewise.
	[!_GLIBCXX_P1394] (span::__is_compatible_container): New alias
	template for SFINAE constraints.
	[!_GLIBCXX_P1394] (span::span(Container&))
	(span::span(const Container&)): Improve constraints.
	[!_GLIBCXX_P1394] (span::span(pointer, size_type))
	(span::span(pointer, pointer)): Remove redundant cast of pointer.
	(span(const span<OType, OExtent>&)): New constructor.

2019-09-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/range_access.h (ssize): Define for C++20.
	* testsuite/24_iterators/range_access_cpp20.cc: New test.
	* doc/xml/manual/status_cxx2020.xml: Update P1227R2 status.
	* doc/html/*: Regenerate.

2019-09-06  Florian Weimer  <fweimer@redhat.com>

	* configure: Regenerate.

2019-09-05  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2020.xml: Update status for P0122R7 and
	P1024R3. Remove entry for P0920R2.
	* include/std/span  (__cpp_lib_span): Change value.
	(__extent_storage, __extent_storage<dynamic_extent>): Remove default
	constructor.
	(span): Replace __extent_storage base class with data member.
	(span::_S_subspan_extent): New function.
	(span::empty()): Add nodiscard attribute.
	(span::front, span::back, span::operator[]): Check preconditions.
	(span::first, span::last, span::subspan): Add noexcept. Improve
	precondition checks (LWG 3103).
	(get): Remove redundant condition from static_assert.
	(tuple_element<I, span<T, E>>): Fix static_assert message and simplify.
	(as_writable_bytes): Add inline specifier.
	* include/std/version (__cpp_lib_span): Change value.
	* testsuite/23_containers/span/back_neg.cc: Remove stray semi-colon.
	* testsuite/23_containers/span/front_neg.cc: Likewise.
	* testsuite/23_containers/span/index_op_neg.cc: Likewise.
	* testsuite/23_containers/span/last_neg.cc: Improve test.
	* testsuite/23_containers/span/subspan_neg.cc: Likewise.
	* testsuite/23_containers/span/1.cc: New test.
	* testsuite/23_containers/span/2.cc: New test.
	* testsuite/23_containers/span/back_assert_neg.cc: New test.
	* testsuite/23_containers/span/first_2_assert_neg.cc: New test.
	* testsuite/23_containers/span/first_assert_neg.cc: New test.
	* testsuite/23_containers/span/first_neg.cc: New test.
	* testsuite/23_containers/span/front_assert_neg.cc: New test.
	* testsuite/23_containers/span/index_op_assert_neg.cc: New test.
	* testsuite/23_containers/span/last_2_assert_neg.cc: New test.
	* testsuite/23_containers/span/last_assert_neg.cc: New test.
	* testsuite/23_containers/span/subspan_2_assert_neg.cc: New test.
	* testsuite/23_containers/span/subspan_3_assert_neg.cc: New test.
	* testsuite/23_containers/span/subspan_4_assert_neg.cc: New test.
	* testsuite/23_containers/span/subspan_5_assert_neg.cc: New test.
	* testsuite/23_containers/span/subspan_6_assert_neg.cc: New test.
	* testsuite/23_containers/span/subspan_assert_neg.cc: New test.

2019-09-05  JeanHeyd Meneide  <phdofthehouse@gmail.com>

	* include/Makefile.am: Add <span> header.
	* include/Makefile.in: Regenerate.
	* include/bits/range_access.h (__adl_begin, __adl_end, __adl_cbegin)
	(__adl_cend, __adl_rbegin, __adl_rend, __adl_crbegin, __adl_crend)
	(__adl_data, __adl_cdata, __adl_size, __adl_empty, __adl_to_address):
	New functions for performing argument-dependent lookup of range
	customization points.
	* include/bits/stl_iterator.h (__normal_iterator): Add
	_GLIBCXX20_CONSTEXPR to all functions.
	* include/std/span: New header.
	* include/std/version (__cpp_lib_span): Define feature test macro.
	* testsuite/23_containers/span/contiguous_range_neg.cc: New test.
	* testsuite/23_containers/span/everything.cc: New test.
	* testsuite/23_containers/span/get_neg.cc: New test.
	* testsuite/23_containers/span/last_neg.cc: New test.
	* testsuite/23_containers/span/subspan_neg.cc: New test.
	* testsuite/23_containers/span/tuple_element_dynamic_neg.cc: New test.
	* testsuite/23_containers/span/tuple_element_oob_neg.cc: New test.
	* testsuite/23_containers/span/tuple_size_neg.cc: New test.

2019-09-05  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/allocator.xml: Remove URL for bibliography entry.
	* doc/html/*: Regenerate.

2019-09-04  Mike Crowe  <mac@mcrowe.com>

	PR libstdc++/41861
	* acinclude.m4 (GLIBCXX_CHECK_PTHREAD_COND_CLOCKWAIT): Check for new
	pthread_cond_clockwait function.
	* configure.ac: Use GLIBCXX_CHECK_PTHREAD_COND_CLOCKWAIT.
	* configure: Regenerate.
	* config.h.in: Regenerate.
	* include/std/condition_variable: (condition_variable): Rename
	__steady_clock_t typedef and add system_clock. Change __clock_t to be
	a typedef for the preferred clock to convert arbitrary other clocks to.
	[_GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT] (wait_until): Add a steady_clock
	overload.
	(wait_until): Change __clock_t overload to use system_clock.
	[_GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT] (__wait_until_impl): Add
	steady_clock overload that calls pthread_cond_clockwait.
	(__wait_until_impl): Change __clock_t overload to use system_clock.
	(condition_variable_any) [_GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT]: Use
	steady_clock for __clock_t if pthread_cond_clockwait is available.

2019-09-04  Mike Crowe  <mac@mcrowe.com>

	* testsuite/30_threads/condition_variable/members/2.cc (test01):
	Parameterise so that test can be run against an arbitrary clock.
	(main): Test using std::chrono::steady_clock and a user-defined
	clock in addition to the previous std::chrono::system_clock.
	* testsuite/30_threads/condition_variable_any/members/2.cc: Likewise.

2019-09-03  Ulrich Weigand  <uweigand@de.ibm.com>

	* crossconfig.m4: Remove references to spu.
	* configure: Regenerate.
	* doc/xml/manual/appendix_contributing.xml: Remove references
	to __ea as "badword" for spu.
	* doc/html/manual/source_code_style.html: Regenerate.
	* include/tr1/ell_integral.tcc (__ellint_rd): Do not attempt
	to avoid __ea (as "badword" for spu).
	(__ellint_rj): Likewise.

2019-09-03  Chung-Lin Tang  <cltang@codesourcery.com>

	PR other/79543
	* acinclude.m4 (GLIBCXX_CHECK_LINKER_FEATURES): Fix GNU ld --version
	scanning to conform to the GNU Coding Standards.
	* configure: Regenerate.

2019-09-02  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++17/memory_resource.cc: Use __constinit keyword.

2019-09-02  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/abi.xml: Document 9.x library versions.
	* doc/html/*: Regenerate.

2019-09-02  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/charconv (__detail::__to_chars_2_len): Use std::log2p1.
	(__detail::__to_chars_8_len): Remove.
	(__detail::__to_chars_8): Inline length calculation here.
	(__detail::__from_chars_binary): Use numeric_limits instead of
	CHAR_BIT.

2019-09-02  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* config/abi/post/i386-solaris/baseline_symbols.txt: Regenerate.
	* config/abi/post/i386-solaris/amd64/baseline_symbols.txt: Likewise.
	* config/abi/post/sparc-solaris/baseline_symbols.txt: Likewise.
	* config/abi/post/sparc-solaris/sparcv9/baseline_symbols.txt:
	Likewise.

2019-09-01  François Dumont  <fdumont@gcc.gnu.org>

	* testsuite_files/util/testsuite_performance.h
	(resource_counter::start): Ignore unused malloc(0) result.

2019-09-01  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/policy_data_structures_biblio.xml (COM: Component
	Model Object Technologies): Adjust name and link.

2019-08-30  Antony Polukhin  <antoshkka@gmail.com>

	* include/std/charconv (__detail::__to_chars_8)
	__detail::__to_chars_16): Replace array of precomputed digits with
	arithmetic operations to avoid CPU cache misses. Remove zero
	termination from array of digits to allow symbol merge with generic
	implementation of __detail::__to_chars. Replace final offsets with
	constants. Use __detail::__to_chars_len_2 instead of a generic
	__detail::__to_chars_len.
	(__detail::__to_chars): Remove zero termination from array of digits.
	(__detail::__to_chars_2): Leading digit is always '1'.

2019-08-30  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/23_containers/vector/cons/89164_c++17.cc: Fix errors.

2019-08-30  Uros Bizjak  <ubizjak@gmail.com>

	* config/abi/post/alpha-linux-gnu/baseline_symbols.txt: Update.

2019-08-30  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89164
	* include/bits/stl_algobase.h (__copy_move): Give descriptive names
	to template parameters.
	* include/bits/stl_uninitialized.h (uninitialized_copy)
	(uninitialized_fill, uninitialized_fill_n): Add static assertions to
	diagnose invalid uses.
	* testsuite/20_util/specialized_algorithms/uninitialized_copy/1.cc:
	Adjust expected error.
	* testsuite/20_util/specialized_algorithms/uninitialized_copy/89164.cc:
	New test.
	* testsuite/20_util/specialized_algorithms/uninitialized_copy_n/
	89164.cc: New test.
	* testsuite/20_util/specialized_algorithms/uninitialized_fill/89164.cc:
	New test.
	* testsuite/20_util/specialized_algorithms/uninitialized_fill_n/
	89164.cc: New test.
	* testsuite/23_containers/vector/cons/89164.cc: New test.
	* testsuite/23_containers/vector/cons/89164_c++17.cc: New test.

2019-08-29  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/91067
	* acinclude.m4 (libtool_VERSION): Bump to 6:28:0.
	* configure: Regenerate.
	* config/abi/pre/gnu.ver (GLIBCXX_3.4.28): Add new version. Export
	missing symbols.
	* testsuite/27_io/filesystem/iterators/91067.cc: Test move
	constructors.
	* testsuite/util/testsuite_abi.cc: Add new symbol version.

2019-08-29  Jakub Jelinek  <jakub@redhat.com>

	* config/abi/post/aarch64-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/s390x-linux-gnu/baseline_symbols.txt: Update.

2019-08-28  Jonathan Wakely  <jwakely@redhat.com>

	* config/abi/post/i386-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/i486-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/powerpc-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/powerpc64-linux-gnu/32/baseline_symbols.txt: Update.
	* config/abi/post/powerpc64-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/x86_64-linux-gnu/32/baseline_symbols.txt: Update.
	* config/abi/post/x86_64-linux-gnu/baseline_symbols.txt: Update.

2019-08-23  Joseph Myers  <joseph@codesourcery.com>

	* src/filesystem/ops-common.h [_GLIBCXX_FILESYSTEM_IS_WINDOWS]
	(std::filesystem::__gnu_posix::lstat): Add return type.

2019-08-20  Jonathan Wakely  <jwakely@redhat.com>

	* doc/doxygen/user.cfg.in (INPUT): Remove profile mode headers.

	* include/std/numeric (reduce): Fix Doxygen markup.

	PR libstdc++/91371
	* include/std/type_traits (is_function): Simplify definition. Remove
	partial specializations for function types.
	(__is_referenceable): Simplify definition.
	* testsuite/20_util/bind/91371.cc: New test.
	* testsuite/20_util/is_function/91371.cc: New test.
	* testsuite/20_util/is_function/value.cc: Check more pointer types.
	* testsuite/20_util/is_member_function_pointer/91371.cc: New test.
	* testsuite/20_util/is_object/91371.cc: New test.

2019-08-16  Uros Bizjak  <ubizjak@gmail.com>

	* config/abi/post/alpha-linux-gnu/baseline_symbols.txt: Update.

2019-08-15  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/91456
	* include/bits/std_function.h (__check_func_return_type): Remove.
	(function::_Callable): Use std::__is_invocable_impl instead of
	__check_func_return_type.
	* include/std/type_traits (__is_invocable_impl): Add another defaulted
	template parameter. Define a separate partial specialization for
	INVOKE and INVOKE<void>. For INVOKE<R> replace is_convertible check
	with a check that models delayed temporary materialization.
	* testsuite/20_util/function/91456.cc: New test.
	* testsuite/20_util/is_invocable/91456.cc: New test.

2019-08-14  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/type_traits (__is_nullptr_t): Add deprecated attribute.

2019-08-14  Edward Smith-Rowland  <3dw4rd@verizon.net>

	Implement C++20 p0879 - Constexpr for swap and swap related functions.
	* include/std/version (__cpp_lib_constexpr_swap_algorithms): New macro.
	* include/bits/algorithmfwd.h (__cpp_lib_constexpr_swap_algorithms):
	New macro.
	(iter_swap, make_heap, next_permutation, partial_sort_copy, pop_heap)
	(prev_permutation, push_heap, reverse, rotate, sort_heap, swap)
	(swap_ranges, nth_element, partial_sort, sort): Add constexpr.
	* include/bits/move.h (swap): Add constexpr.
	* include/bits/stl_algo.h (__move_median_to_first, __reverse, reverse)
	(__gcd, __rotate, rotate, __partition, __heap_select)
	(__partial_sort_copy, partial_sort_copy, __unguarded_partition)
	(__unguarded_partition_pivot, __partial_sort, __introsort_loop, __sort)
	(__introselect, __chunk_insertion_sort, next_permutation)
	(prev_permutation, partition, partial_sort, nth_element, sort)
	(__iter_swap::iter_swap, iter_swap, swap_ranges): Add constexpr.
	* include/bits/stl_algobase.h (__iter_swap::iter_swap, iter_swap)
	(swap_ranges): Add constexpr.
	* include/bits/stl_heap.h (__push_heap, push_heap, __adjust_heap,
	__pop_heap, pop_heap, __make_heap, make_heap, __sort_heap, sort_heap):
	Add constexpr.
	* include/std/type_traits (swap): Add constexpr.
	* testsuite/25_algorithms/headers/algorithm/synopsis.cc: Add constexpr.
	* testsuite/25_algorithms/iter_swap/constexpr.cc: New test.
	* testsuite/25_algorithms/make_heap/constexpr.cc: New test.
	* testsuite/25_algorithms/next_permutation/constexpr.cc: New test.
	* testsuite/25_algorithms/nth_element/constexpr.cc: New test.
	* testsuite/25_algorithms/partial_sort/constexpr.cc: New test.
	* testsuite/25_algorithms/partial_sort_copy/constexpr.cc: New test.
	* testsuite/25_algorithms/partition/constexpr.cc: New test.
	* testsuite/25_algorithms/pop_heap/constexpr.cc: New test.
	* testsuite/25_algorithms/prev_permutation/constexpr.cc: New test.
	* testsuite/25_algorithms/push_heap/constexpr.cc: New test.
	* testsuite/25_algorithms/reverse/constexpr.cc: New test.
	* testsuite/25_algorithms/rotate/constexpr.cc: New test.
	* testsuite/25_algorithms/sort/constexpr.cc: New test.
	* testsuite/25_algorithms/sort_heap/constexpr.cc: New test.
	* testsuite/25_algorithms/swap/constexpr.cc: New test.
	* testsuite/25_algorithms/swap_ranges/constexpr.cc: New test.

2019-08-12  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/90361
	* src/c++17/string-inst.cc: Use _GLIBCXX_USE_CXX11_ABI=1 by default.

	* include/std/tuple (__unpack_std_tuple): New variable template and
	partial specializations.
	(apply, make_from_tuple): Add noexcept-specifier.
	* testsuite/20_util/tuple/apply/2.cc: New test.
	* testsuite/20_util/tuple/make_from_tuple/2.cc: New test.

2019-08-09  Corentin Gay  <gay@adacore.com>

	* testsuite/ext/random/beta_distribution/operators/serialize.cc,
	testsuite/ext/random/hypergeometric_distribution/operators/serialize.cc,
	testsuite/ext/random/normal_mv_distribution/operators/serialize.cc,
	testsuite/ext/random/triangular_distribution/operators/serialize.cc,
	testsuite/ext/random/von_mises_distribution/operators/serialize.cc:
	Add call to `VERIFY`.

2019-08-09  Alexandre Oliva <oliva@adacore.com>

	* include/ext/random
	(normal_mv_distribution::param_type::param_type): New private
	ctor taking a decomposed varcov matrix, for use by...
	(operator>>): ... this, befriended.
	* include/ext/random.tcc (operator>>): Use it.
	(normal_mv_distribution::param_type::_M_init_lower): Adjust
	member function name in exception message.

2019-08-08  Jonathan Wakely  <jwakely@redhat.com>

	P0325R4 to_array from LFTS with updates
	* include/experimental/array (to_array): Qualify call to __to_array.
	* include/std/array (__cpp_lib_to_array, to_array): Define for C++20.
	* include/std/version (__cpp_lib_to_array): Likewise.
	* testsuite/23_containers/array/creation/1.cc: New test.
	* testsuite/23_containers/array/creation/2.cc: New test.
	* testsuite/23_containers/array/creation/3_neg.cc: New test.
	* testsuite/23_containers/array/tuple_interface/tuple_element_neg.cc:
	Use zero for dg-error line number.

2019-08-06  Jonathan Wakely  <jwakely@redhat.com>

	P1651R0 bind_front should not unwrap reference_wrapper
	* include/std/functional (bind_front): Don't unwrap reference_wrapper.
	* include/std/version (__cpp_lib_bind_front): Update value.
	* testsuite/20_util/function_objects/bind_front/1.cc: Fix test for
	feature test macro.
	* testsuite/20_util/function_objects/bind_front/2.cc: New test.

	* include/std/numbers [!__STRICT_ANSI__ && _GLIBCXX_USE_FLOAT128]
	(e_v, log2e_v, log10e_v, pi_v, inv_pi_v, inv_sqrtpi_v, ln2_v, ln10_v)
	(sqrt2_v, sqrt3_v, inv_sqrt3, egamma_v, phi_v): Add explicit
	specializations for __float128.
	* testsuite/26_numerics/numbers/float128.cc: New test.

2019-08-04  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/documentation_hacking.xml: doxygen.org is now
	doxygen.nl.

2019-08-01  Edward Smith-Rowland  <3dw4rd@verizon.net>

	Implement C++20 p0202 - Add Constexpr Modifiers to Functions
	in <algorithm> and <utility> Headers.
	Implement C++20 p1023 - constexpr comparison operators for std::array.
	* include/bits/algorithmfwd.h (all_of, any_of, binary_search, copy,
	copy_backward, copy_if, copy_n, equal_range, fill, find_end,
	find_if_not, includes, is_heap, is_heap_until, is_partitioned,
	is_permutation, is_sorted, is_sorted_until, iter_swap, lower_bound,
	none_of, partition_copy, partition_point, remove, remove_if,
	remove_copy, remove_copy_if, replace_copy, replace_copy_if,
	reverse_copy, rotate_copy, uunique, upper_bound, adjacent_find, count,
	count_if, equal, find, find_first_of, find_if, for_each, generate,
	generate_n, lexicographical_compare, merge, mismatch, replace,
	replace_if, search, search_n, set_difference, set_intersection,
	set_symmetric_difference, set_union, transform, unique_copy):
	Mark constexpr.
	* include/bits/cpp_type_traits.h (__miter_base): Mark constexpr.
	* include/bits/predefined_ops.h (_Iter_less_val::operator(),
	_Val_less_iter::operator(), _Iter_equal_to_iter::operator(),
	_Iter_equal_to_val::operator(), _Iter_equals_val::operator()):
	 Use const ref instead of ref arg;
	(_Iter_less_val, __iter_less_val, _Val_less_iter, __val_less_iter,
	__iter_equal_to_iter, __iter_equal_to_val, __iter_comp_val,
	_Iter_comp_val, _Val_comp_iter, __val_comp_iter, __iter_equals_val,
	_Iter_equals_iter, __iter_comp_iter, _Iter_pred, __pred_iter,
	_Iter_comp_to_val, __iter_comp_val, _Iter_comp_to_iter,
	__iter_comp_iter): Mark constexpr.
	* include/bits/stl_algo.h (__find_if, __find_if_not, __find_if_not_n,
	__search, __search_n_aux, __search_n, __find_end, find_end, all_of,
	none_of, any_of, find_if_not, is_partitioned, partition_point,
	__remove_copy_if, remove_copy, remove_copy_if, copy_if, __copy_n,
	copy_n, partition_copy, __remove_if, remove, remove_if, __adjacent_find,
	__unique, unique, __unique_copy, reverse_copy, rotate_copy,
	__unguarded_linear_insert, __insertion_sort, __unguarded_insertion_sort,
	__final_insertion_sort, lower_bound, __upper_bound, upper_bound,
	__equal_range, equal_range, binary_search, __includes, includes,
	__next_permutation, __prev_permutation, __replace_copy_if, replace_copy,
	replace_copy_if, __count_if, is_sorted, __is_sorted_until,
	is_sorted_until, __is_permutation, is_permutation, for_each, find,
	find_if, find_first_of, adjacent_find, count, count_if, search,
	search_n, transform, replace, replace_if, generate, generate_n,
	unique_copy, __merge, merge, __set_union, set_union, __set_intersection,
	set_intersection, __set_difference, set_difference,
	__set_symmetric_difference, set_symmetric_difference):  Mark constexpr.
	* include/bits/stl_algobase.h (__memmove, __memcmp): New maybe constexpr
	wrappers around __builtin_memmove and __builtin_memcmp
	respectively;
	(__niter_base, __niter_wrap, __copy_m, __copy_move_a, __copy_move_a2,
	copy, move, __copy_move_b, __copy_move_backward_a,
	__copy_move_backward_a2, copy_backward, move_backward, __fill_a, fill,
	__fill_n_a, fill_n, equal, __lc_rai::__newlast1, __lc_rai::__cnd2,
	__lexicographical_compare_impl, __lexicographical_compare,
	__lexicographical_compare<true>::__lc, __lexicographical_compare_aux,
	__lower_bound, lower_bound, equal, __equal4, lexicographical_compare,
	__mismatch, mismatch, __is_heap_until, __is_heap, is_heap_until,
	is_heap): Mark constexpr.
	* include/bits/stl_heap.h (__is_heap_until, __is_heap, is_heap_until,
	is_heap): Mark constexpr.
	* include/bits/stl_iterator.h (__niter_base, __miter_base): Mark constexpr.
	* include/std/array: Make comparison ops constexpr.
	* include/std/utility: Make exchange constexpr.
	* include/std/version (__cpp_lib_constexpr_algorithms): New macro.
	* testsuite/23_containers/array/tuple_interface/get_neg.cc: Adjust.
	* testsuite/23_containers/array/tuple_interface/
	tuple_element_neg.cc: Adjust.
	* testsuite/20_util/exchange/constexpr.cc: New.
	* testsuite/23_containers/array/comparison_operators/constexpr.cc: New.
	* testsuite/25_algorithms/constexpr_macro.cc: New.
	* testsuite/25_algorithms/adjacent_find/constexpr.cc: New.
	* testsuite/25_algorithms/all_of/constexpr.cc: New.
	* testsuite/25_algorithms/any_of/constexpr.cc: New.
	* testsuite/25_algorithms/binary_search/constexpr.cc: New.
	* testsuite/25_algorithms/copy/constexpr.cc: New.
	* testsuite/25_algorithms/copy_backward/constexpr.cc: New.
	* testsuite/25_algorithms/copy_if/constexpr.cc: New.
	* testsuite/25_algorithms/copy_n/constexpr.cc: New.
	* testsuite/25_algorithms/count/constexpr.cc: New.
	* testsuite/25_algorithms/count_if/constexpr.cc: New.
	* testsuite/25_algorithms/equal/constexpr.cc: New.
	* testsuite/25_algorithms/equal_range/constexpr.cc: New.
	* testsuite/25_algorithms/fill/constexpr.cc: New.
	* testsuite/25_algorithms/fill_n/constexpr.cc: New.
	* testsuite/25_algorithms/find/constexpr.cc: New.
	* testsuite/25_algorithms/find_end/constexpr.cc: New.
	* testsuite/25_algorithms/find_first_of/constexpr.cc: New.
	* testsuite/25_algorithms/find_if/constexpr.cc: New.
	* testsuite/25_algorithms/find_if_not/constexpr.cc: New.
	* testsuite/25_algorithms/for_each/constexpr.cc: New.
	* testsuite/25_algorithms/generate/constexpr.cc: New.
	* testsuite/25_algorithms/generate_n/constexpr.cc: New.
	* testsuite/25_algorithms/is_heap/constexpr.cc: New.
	* testsuite/25_algorithms/is_heap_until/constexpr.cc: New.
	* testsuite/25_algorithms/is_partitioned/constexpr.cc: New.
	* testsuite/25_algorithms/is_permutation/constexpr.cc: New.
	* testsuite/25_algorithms/is_sorted/constexpr.cc: New.
	* testsuite/25_algorithms/is_sorted_until/constexpr.cc: New.
	* testsuite/25_algorithms/lexicographical_compare/constexpr.cc: New.
	* testsuite/25_algorithms/lower_bound/constexpr.cc: New.
	* testsuite/25_algorithms/merge/constexpr.cc: New.
	* testsuite/25_algorithms/mismatch/constexpr.cc: New.
	* testsuite/25_algorithms/none_of/constexpr.cc: New.
	* testsuite/25_algorithms/partition_copy/constexpr.cc: New.
	* testsuite/25_algorithms/partition_point/constexpr.cc: New.
	* testsuite/25_algorithms/remove/constexpr.cc: New.
	* testsuite/25_algorithms/remove_copy/constexpr.cc: New.
	* testsuite/25_algorithms/remove_copy_if/constexpr.cc: New.
	* testsuite/25_algorithms/remove_if/constexpr.cc: New.
	* testsuite/25_algorithms/replace_copy/constexpr.cc: New.
	* testsuite/25_algorithms/replace_copy_if/constexpr.cc: New.
	* testsuite/25_algorithms/replace_if/constexpr.cc: New.
	* testsuite/25_algorithms/reverse_copy/constexpr.cc: New.
	* testsuite/25_algorithms/rotate_copy/constexpr.cc: New.
	* testsuite/25_algorithms/search/constexpr.cc: New.
	* testsuite/25_algorithms/search_n/constexpr.cc: New.
	* testsuite/25_algorithms/set_difference/constexpr.cc: New.
	* testsuite/25_algorithms/set_intersection/constexpr.cc: New.
	* testsuite/25_algorithms/set_symmetric_difference/constexpr.cc: New.
	* testsuite/25_algorithms/set_union/constexpr.cc: New.
	* testsuite/25_algorithms/transform/constexpr.cc: New.
	* testsuite/25_algorithms/unique/constexpr.cc: New.
	* testsuite/25_algorithms/unique_copy/constexpr.cc: New.
	* testsuite/25_algorithms/upper_bound/constexpr.cc: New.

2019-07-31  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/memory (make_obj_using_allocator): Qualify call to
	uses_allocator_construction_args.

	P0631R4 Math Constants
	* include/Makefile.am: Add new header.
	* include/Makefile.in: Regenerate.
	* include/precompiled/stdc++.h: Include new header.
	* include/std/numbers: New header.
	* include/std/version (__cpp_lib_math_constants): Define.
	* testsuite/26_numerics/numbers/1.cc: New test.
	* testsuite/26_numerics/numbers/2.cc: New test.
	* testsuite/26_numerics/numbers/3.cc: New test.
	* testsuite/26_numerics/numbers/nonfloat_neg.cc: New test.

	* include/std/bit: Add Doxygen comments.

	PR libstdc++/91308
	* include/bits/unique_ptr.h (unique_ptr::__safe_conversion_up): Remove
	constraints on deleter that should only apply to the constructor.
	(unique_ptr<T[], D>::__safe_conversion_up): Likewise.
	(unique_ptr<T[], D>::unique_ptr(unique_ptr<U, D>&&)): Restore
	constraints on deleter here.
	* testsuite/20_util/unique_ptr/assign/91308.cc: New test.

2019-07-29  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/51333
	* libsupc++/cxxabi.h (__gnu_cxx::recursive_init_error): Do not define
	constructor inline.
	* libsupc++/guard_error.cc (__gnu_cxx::recursive_init_error): Define
	constructor.
	* testsuite/18_support/51333.cc: New test.

2019-07-28  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/documentation_hacking.xml: Fix broken reference
	to the Doxygen manual. Avoid a "here" link on the way.
	Fix another broken link to Doxygen docblocks.

2019-07-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/bit (__cpp_lib_endian): Define.
	* include/std/version (__cpp_lib_endian): Define.
	* testsuite/26_numerics/endian/2.cc: New.
	* testsuite/26_numerics/endian/3.cc: New.
	* testsuite/26_numerics/endian/4.cc: New.

2019-07-26  François Dumont  <fdumont@gcc.gnu.org>

	* testsuite/util/testsuite_iterators.h
	(bidirectional_iterator_wrapper): Fix type comment.
	(random_access_iterator_wrapper): Likewise.

2019-07-25  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/bit (endian): Move definition here as per P1612R1.
	* include/std/type_traits (endian): Remove definition from here.
	* testsuite/20_util/endian/1.cc: Rename to ...
	* testsuite/26_numerics/endian/1.cc: ... here. Adjust header.

2019-07-25  Martin Liska  <mliska@suse.cz>
	    Dominik Infuhr  <dominik.infuehr@theobroma-systems.com>

	PR c++/23383
	* testsuite/ext/bitmap_allocator/check_delete.cc: Add
	-fno-allocation-dce.
	* testsuite/ext/bitmap_allocator/check_new.cc: Likewise.
	* testsuite/ext/new_allocator/check_delete.cc: Likewise.
	* testsuite/ext/new_allocator/check_new.cc: Likewise.

2019-07-22  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/26_numerics/bit/bitops.count/*: Rename to ...
	* testsuite/26_numerics/bit/bit.count/*: Here.

	* include/std/bit (__rotl, __rotr): Change second parameter from
	unsigned int to int and handle negative values.
	(rotl, rotr): Remove check for __STRICT_ANSI__. Change second
	parameter from unsigned int to int. Add nodiscard attribute.
	* testsuite/26_numerics/bit/bitops.rot/rotl.cc: Rename to ...
	* testsuite/26_numerics/bit/bit.rotate/rotl.cc: Here. Test negative
	shifts.
	* testsuite/26_numerics/bit/bitops.rot/rotr.cc: Rename to ...
	* testsuite/26_numerics/bit/bit.rotate/rotr.cc: Here. Test negative
	shifts.

	* include/std/bit (__ceil2): Make unrepresentable results undefined,
	as per P1355R2. Add debug assertion. Perform one left shift, not two,
	so that out of range values cause undefined behaviour. Ensure that
	shift will still be undefined if left operand is promoted.
	* testsuite/26_numerics/bit/bit.pow.two/ceil2.cc: Replace checks for
	unrepresentable values with checks that they are not core constant
	expressions.
	* testsuite/26_numerics/bit/bit.pow.two/ceil2_neg.cc: New test.

2019-07-19  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/stl_tempbuf.h (__detail::__return_temporary_buffer): Fix
	sized deallocation size computation.

2019-07-19  Andreas Schwab  <schwab@linux-m68k.org>

	* config/abi/post/m68k-linux-gnu/baseline_symbols.txt: Update.

2019-07-18  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/stl_tempbuf.h (__detail::__return_temporary_buffer): New.
	(~_Temporary_buffer()): Use latter.
	(_Temporary_buffer(_FIterator, size_type)): Likewise.

2019-07-17  Andreas Schwab  <schwab@suse.de>

	* config/abi/post/ia64-linux-gnu/baseline_symbols.txt: Update.

2019-07-16  Jason Merrill  <jason@redhat.com>

	* include/std/memory (uses_allocator_construction_args): Add parens
	around constraint.

2019-07-12  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/29_atomics/atomic_float/1.cc: Fix comment.

	* include/experimental/string_view (__detail::__idt): Remove.
	(operator==, operator!=, operator<, operator>, operator<=, operator>=):
	Use __type_identity_t instead of __detail::__idt;
	* include/std/string_view (__detail::__idt): Remove.
	(operator==, operator!=, operator<, operator>, operator<=, operator>=):
	Use __type_identity_t instead of __detail::__idt;
	* include/std/type_traits (__type_identity_t): New alias template.

	* doc/xml/manual/status_cxx2020.xml: Update status for atomic_ref
	and floating point atomics.

2019-07-11  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/configure.xml: Improve documentation of
	--enable-libstdcxx-time option.

	* include/bits/atomic_base.h (__atomic_impl): New namespace for
	wrappers around atomic built-ins.
	(__atomic_float, __atomic_ref): New class templates for use as base
	classes.
	* include/std/atomic (atomic<float>, atomic<double>)
	(atomic<long double>): New explicit specializations.
	(atomic_ref): New class template.
	(__cpp_lib_atomic_ref): Define.
	* include/std/version (__cpp_lib_atomic_ref): Define.
	* testsuite/29_atomics/atomic/60695.cc: Adjust dg-error.
	* testsuite/29_atomics/atomic_float/1.cc: New test.
	* testsuite/29_atomics/atomic_float/requirements.cc: New test.
	* testsuite/29_atomics/atomic_ref/deduction.cc: New test.
	* testsuite/29_atomics/atomic_ref/float.cc: New test.
	* testsuite/29_atomics/atomic_ref/generic.cc: New test.
	* testsuite/29_atomics/atomic_ref/integral.cc: New test.
	* testsuite/29_atomics/atomic_ref/pointer.cc: New test.
	* testsuite/29_atomics/atomic_ref/requirements.cc: New test.

2019-07-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/ext/atomicity.h (__exchange_and_add, __atomic_add): Replace
	throw() with _GLIBCXX_NOTHROW.
	(__atomic_add_dispatch): Return after performing atomic increment.

2019-07-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/ext/atomicity.h [_GLIBCXX_ATOMIC_BUILTINS] (__atomic_add)
	(__exchange_and_add): Replace static specifier with always_inline
	attribute.
	(__exchange_and_add_single, __atomic_add_single): Likewise.
	(__exchange_and_add_dispatch, __atomic_add_dispatch): Likewise. Also
	combine !__gthread_active_p() and !__GTHREADS branches.

2019-07-03  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/91067
	* acinclude.m4 (libtool_VERSION): Bump to 6:27:0.
	* configure: Regenerate.
	* config/abi/pre/gnu.ver (GLIBCXX_3.4.27): Add new version. Export
	missing symbols.
	* testsuite/27_io/filesystem/iterators/91067.cc: New test.
	* testsuite/util/testsuite_abi.cc: Add new symbol version.

2019-07-02  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/c++config (_GLIBCXX_HAVE_BUILTIN_LAUNDER)
	(_GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED): Use __has_builtin
	instead of __is_identifier to detect Clang support.

2019-07-02  Jim Wilson  <jimw@sifive.com>

	* configure.ac (BUILD_PDF): Also test for doxygen, dot, xsltproc,
	and xmllint.
	* configure: Regenerate.

2019-06-27  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/91012
	* src/c++17/fs_path.cc (filesystem_error::_Impl): Use a string_view
	for the what_arg parameters.
	(filesystem_error::filesystem_error): Pass system_error::what() to
	the _Impl constructor.
	* testsuite/27_io/filesystem/filesystem_error/cons.cc: Ensure that
	filesystem_error::what() contains system_error::what().

2019-06-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/charconv (chars_format): Define bitmask type.
	* testsuite/20_util/to_chars/chars_format.cc: New test.

	* include/bits/fs_path.h (path::__is_encoded_char): Use __is_one_of.
	* include/std/bit (_If_is_unsigned_integer_type): Remove.
	(_If_is_unsigned_integer): Use __is_unsigned_integer.
	(rotl(byte, unsigned), rotr(byte, unsigned), countl_zero(byte))
	(countl_one(byte), countr_zero(byte), countr_one(byte))
	(popcount(byte), ispow2(byte), ceil2(byte), floor2(byte))
	(log2p1(byte)): Remove.
	* include/std/charconv (__detail::__is_one_of): Move to <type_traits>.
	(__detail::__is_int_to_chars_type): Remove.
	(__detail::__integer_to_chars_result_type): Use __is_signed_integer
	and __is_unsigned_integer.
	* include/std/type_traits (__is_one_of): Move here from <charconv>.
	(__is_signed_integer, __is_unsigned_integer): New helpers.
	* testsuite/26_numerics/bit/bit.pow.two/ceil2.cc: Remove test for
	std::byte overload.
	* testsuite/26_numerics/bit/bit.pow.two/floor2.cc: Likewise.
	* testsuite/26_numerics/bit/bit.pow.two/ispow2.cc: Likewise.
	* testsuite/26_numerics/bit/bit.pow.two/log2p1.cc: Likewise.
	* testsuite/26_numerics/bit/bitops.count/countl_one.cc: Likewise.
	* testsuite/26_numerics/bit/bitops.count/countl_zero.cc: Likewise.
	* testsuite/26_numerics/bit/bitops.count/countr_one.cc: Likewise.
	* testsuite/26_numerics/bit/bitops.count/countr_zero.cc: Likewise.
	* testsuite/26_numerics/bit/bitops.count/popcount.cc: Likewise.
	* testsuite/26_numerics/bit/bitops.rot/rotl.cc: Likewise.
	* testsuite/26_numerics/bit/bitops.rot/rotr.cc: Likewise.

2019-06-25  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/numeric (midpoint(T, T)): Avoid std::abs in constexpr
	function.

2019-06-25  Jakub Jelinek  <jakub@redhat.com>

	* include/pstl/pstl_config.h (_PSTL_PRAGMA_SIMD_SCAN,
	_PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN, _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN):
	Define to OpenMP 5.0 pragmas even for GCC 10.0+.
	(_PSTL_UDS_PRESENT): Define to 1 for GCC 10.0+.

2019-06-24  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/numeric (midpoint(T, T)): Change implementation for
	floating-point types to avoid incorrect rounding of denormals.
	* testsuite/26_numerics/midpoint/floating.cc: Add check for correct
	rounding with denormals.
	* testsuite/26_numerics/gcd/gcd_neg.cc: Adjust dg-error line numbers.
	* testsuite/26_numerics/lcm/lcm_neg.cc: Likewise.

	* testsuite/18_support/headers/cfloat/values_c++17.cc: New test.

2019-06-20  Jonathan Wakely  <jwakely@redhat.com>

	* acinclude.m4 (GLIBCXX_ENABLE_DEBUG): Only do debug build for final
	stage of bootstrap.
	* configure: Regenerate.

	* include/std/variant (_Variant_storage, _Extra_visit_slot_needed):
	Qualify calls to __never_valueless.

	* doc/xml/manual/status_cxx2017.xml: Fix outdated reference to
	C++17 working draft.

	* testsuite/libstdc++-prettyprinters/simple.cc: Use non-palindromic
	vector<bool> for test.
	* testsuite/libstdc++-prettyprinters/simple11.cc: Likewise.

2019-06-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stream_iterator.h (istream_iterator::_M_equal()): Make
	private.
	(istream_iterator::_M_read()): Do not check stream state before
	attempting extraction. Set stream pointer to null when extraction
	fails (P0738R2).
	(operator==(const istream_iterator&, const istream_iterator&)): Change
	to be a hidden friend of istream_iterator.
	(operator!=(const istream_iterator&, const istream_iterator&)):
	Likewise.
	(ostream_iterator::ostream_iterator()): Add default constructor.
	(ostream_iterator::ostream_iterator(ostream_type*, const C*)): Use
	addressof.
	* testsuite/24_iterators/istream_iterator/1.cc: New test.
	* testsuite/24_iterators/ostream_iterator/1.cc: New test.
	* testsuite/24_iterators/ostream_iterator/70766.cc: Also check
	constructor taking a string.
	* testsuite/24_iterators/ostream_iterator/requirements/constexpr.cc:
	New test.

2019-06-19  Michael Weghorn  <m.weghorn@posteo.de>
	    Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/90945
	* python/libstdcxx/v6/printers.py (StdVectorPrinter._iterator): Use
	values of type bool for vector<bool> elements.
	* testsuite/libstdc++-prettyprinters/simple.cc: Test vector<bool>.
	* testsuite/libstdc++-prettyprinters/simple11.cc: Likewise.

2019-06-19  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/90920 partially revert r263433
	* include/bits/stl_algo.h (__rotate): Restore checks for empty ranges.
	(rotate): Remove checks.
	* testsuite/25_algorithms/rotate/90920.cc: New test.

	* include/std/numeric (reduce(Iter, Iter, T, BinOp)): Fix value
	category used in invocable check.
	(reduce(Iter, Iter, T)): Pass initial value as rvalue.
	* testsuite/26_numerics/reduce/2.cc: New test.

2019-06-18  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/algorithmfwd.h: Change title of doc group.
	* include/bits/stl_algo.h (for_each_n): Add new C++17 algorithm from
	P0024R2.
	* include/bits/stl_numeric.h: Define doc group and add algos to it.
	* include/std/numeric (__is_random_access_iter): New internal trait.
	(reduce, transform_reduce, exclusive_scan, inclusive_scan)
	(transform_exclusive_scan, transform_inclusive_scan): Likewise.
	* testsuite/25_algorithms/for_each/for_each_n.cc: New test.
	* testsuite/26_numerics/exclusive_scan/1.cc: New test.
	* testsuite/26_numerics/inclusive_scan/1.cc: New test.
	* testsuite/26_numerics/reduce/1.cc: New test.
	* testsuite/26_numerics/transform_exclusive_scan/1.cc: New test.
	* testsuite/26_numerics/transform_inclusive_scan/1.cc: New test.
	* testsuite/26_numerics/transform_reduce/1.cc: New test.
	* testsuite/util/testsuite_iterators.h (test_container::size()): New
	member function.

	* include/c_global/cstddef (std::byte): Perform arithmetic operations
	in unsigned int to avoid promotion (LWG 2950).

2019-06-17  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/allocator/1.cc: Add sized delete, which fixes a
	failure on AIX.

	* include/c_global/cmath (__lerp, lerp): Add noexcept (LWG 3201).

	PR libstdc++/90281 Fix string conversions for filesystem::path
	* include/bits/fs_path.h (u8path) [_GLIBCXX_FILESYSTEM_IS_WINDOWS]:
	Use codecvt_utf8_utf16 instead of codecvt_utf8. Use
	__str_codecvt_in_all to fail for partial conversions and throw on
	error.
	[!_GLIBCXX_FILESYSTEM_IS_WINDOWS && _GLIBCXX_USE_CHAR8_T]
	(path::_Cvt<char8_t>): Add explicit specialization.
	[_GLIBCXX_FILESYSTEM_IS_WINDOWS] (path::_Cvt::_S_wconvert): Remove
	overloads.
	[_GLIBCXX_FILESYSTEM_IS_WINDOWS] (path::_Cvt::_S_convert): Use
	if-constexpr instead of dispatching to _S_wconvert. Use codecvt
	instead of codecvt_utf8. Use __str_codecvt_in_all and
	__str_codecvt_out_all.
	[!_GLIBCXX_FILESYSTEM_IS_WINDOWS] (path::_Cvt::_S_convert): Use
	codecvt instead of codecvt_utf8. Use __str_codecvt_out_all.
	(path::_S_str_convert) [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Use
	codecvt_utf8_utf16 instead of codecvt_utf8. Construct return values
	with allocator. Use __str_codecvt_out_all. Fallthrough to POSIX code
	after converting to UTF-8.
	(path::_S_str_convert): Use codecvt instead of codecvt_utf8. Use
	__str_codecvt_in_all.
	(path::string): Fix initialization of string types with different
	allocators.
	(path::u8string) [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Use
	codecvt_utf8_utf16 instead of codecvt_utf8. Use __str_codecvt_out_all.
	* include/bits/locale_conv.h (__do_str_codecvt): Reorder static and
	runtime conditions.
	(__str_codecvt_out_all, __str_codecvt_in_all): New functions that
	return false for partial conversions.
	* include/experimental/bits/fs_path.h (u8path):
	[_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Implement correctly for mingw.
	[_GLIBCXX_FILESYSTEM_IS_WINDOWS] (path::_Cvt::_S_wconvert): Add
	missing handling for char8_t. Use codecvt and codecvt_utf8_utf16
	instead of codecvt_utf8. Use __str_codecvt_in_all and
	__str_codecvt_out_all.
	[!_GLIBCXX_FILESYSTEM_IS_WINDOWS] (path::_Cvt::_S_convert): Use
	codecvt instead of codecvt_utf8. Use __str_codecvt_out_all.
	(path::string) [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Use
	codecvt_utf8_utf16 instead of codecvt_utf8. Construct return values
	with allocator. Use __str_codecvt_out_all and __str_codecvt_in_all.
	(path::string) [!_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Use
	__str_codecvt_in_all.
	(path::u8string) [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Use
	codecvt_utf8_utf16 instead of codecvt_utf8. Use __str_codecvt_out_all.
	* src/c++17/fs_path.cc (path::_S_convert_loc): Use
	__str_codecvt_in_all.
	* src/filesystem/path.cc (path::_S_convert_loc): Likewise.
	* testsuite/27_io/filesystem/path/construct/90281.cc: New test.
	* testsuite/27_io/filesystem/path/factory/u8path.cc: New test.
	* testsuite/27_io/filesystem/path/native/string.cc: Test with empty
	strings and with Unicode characters outside the basic multilingual
	plane.
	* testsuite/27_io/filesystem/path/native/alloc.cc: New test.
	* testsuite/experimental/filesystem/path/construct/90281.cc: New test.
	* testsuite/experimental/filesystem/path/factory/u8path.cc: New test.
	* testsuite/experimental/filesystem/path/native/alloc.cc: New test.
	* testsuite/experimental/filesystem/path/native/string.cc: Test with
	empty strings and with Unicode characters outside the basic
	multilingual plane.

2019-06-17  François Dumont  <fdumont@gcc.gnu.org>
	    Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/hashtable.h (struct _Hashtable::_Scoped_node): New type.
	(_Hashtable::_M_insert_unique_node): Add key_type parameter. Don't
	deallocate node if insertion fails.
	(_Hashtable::_M_insert_multi_node): Likewise.
	(_Hashtable::_M_reinsert_node): Pass additional key argument.
	(_Hashtable::_M_reinsert_node_multi): Likewise. Remove FIXME.
	(_Hashtable::_M_extract_node(size_t, __node_base*)): New function.
	(_Hashtable::extract(const_iterator)): Use _M_extract_node.
	(_Hashtable::extract(const _Key&)): Likewise.
	(_Hashtable::_M_merge_unique): Pass additional key argument.
	(_Hashtable::_M_emplace<Args>(true_type, Args&&...)): Likewise. Use
	_Scoped_node.
	(_Hashtable::_M_insert): Likewise.
	* include/bits/hashtable_policy.h (_Map_base::operator[]): Likewise.
	(_Hashtable_alloc): Add comments to functions with misleading names.

2019-06-17  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/bad_function_call/what.cc: Include <string> header
	for std::string.
	* testsuite/20_util/shared_ptr/cons/weak_ptr_expired.cc: Likewise.
	* testsuite/20_util/tuple/cons/allocator_with_any.cc: Include <memory>
	header for std::allocator.
	* testsuite/23_containers/array/tuple_interface/tuple_element.cc: Add
	using-declaration for std::size_t.
	* testsuite/23_containers/array/tuple_interface/tuple_size.cc:
	Likewise.
	* testsuite/23_containers/deque/cons/55977.cc: Include <istream> for
	std::istream.
	* testsuite/23_containers/vector/cons/55977.cc: Likewise.
	* testsuite/experimental/map/erasure.cc: Include <string> for
	std::string.
	* testsuite/experimental/unordered_map/erasure.cc: Likewise.

2019-06-14  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/type_traits (experimental::nonesuch): Use
	pragma to disable -Wctor-dtor-privacy warnings.
	* include/std/type_traits (__is_convertible_helper<From, To, false>)
	(__is_nt_convertible_helper<From, To, false>, __nonesuch): Likewise.

	* include/std/version (__cpp_lib_bind_front): Add missing macro.

2019-06-12  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/algorithm (__cpp_lib_parallel_algorithm): Fix value.
	* include/std/memory (__cpp_lib_parallel_algorithm): Likewise.
	* include/std/numeric (__cpp_lib_parallel_algorithm): Likewise.
	* testsuite/25_algorithms/pstl/feature_test.cc: New test.

	* include/std/variant (get<T>, get<N>, get_if<N>, get_if<T>)
	(variant::emplace): Change static_assert messages from "should be"
	to "must be".
	(hash<monostate>::operator()): Remove name of unused parameter.

	* include/std/mutex (scoped_lock::~scoped_lock()): Use fold
	expression.

	* include/Makefile.am: Add new <bits/charconv.h> header.
	* include/Makefile.in: Regenerate.
	* include/bits/basic_string.h (to_string(int), to_string(unsigned))
	(to_string(long), to_string(unsigned long), to_string(long long))
	(to_string(unsigned long long)): Rewrite to use __to_chars_10_impl.
	* include/bits/charconv.h: New header.
	(__detail::__to_chars_len): Move here from <charconv>.
	(__detail::__to_chars_10_impl): New function extracted from
	__detail::__to_chars_10.
	* include/std/charconv (__cpp_lib_to_chars): Add, but comment out.
	(__to_chars_unsigned_type): New class template that reuses
	__make_unsigned_selector_base::__select to pick a type.
	(__unsigned_least_t): Redefine as __to_chars_unsigned_type<T>::type.
	(__detail::__to_chars_len): Move to new header.
	(__detail::__to_chars_10): Add inline specifier. Move code doing the
	output to __detail::__to_chars_10_impl and call that.
	* include/std/version (__cpp_lib_to_chars): Add, but comment out.
	* testsuite/21_strings/basic_string/numeric_conversions/char/
	to_string.cc: Fix reference in comment. Remove unused variable.
	* testsuite/21_strings/basic_string/numeric_conversions/char/
	to_string_int.cc: New test.

2019-06-09  Edward Smith-Rowland  <3dw4rd@verizon.net>

	Fix ConstexprIterator requirements tests - No constexpr algorithms!
	* testsuite/21_strings/basic_string_view/requirements/constexpr_iter.cc:
	Replace copy with hand-rolled loop.
	* testsuite/23_containers/array/requirements/constexpr_iter.cc:
	Ditto.

2019-06-08  Edward Smith-Rowland  <3dw4rd@verizon.net>

	Test for C++20 p0858 - ConstexprIterator requirements.
	* testsuite/21_strings/basic_string_view/requirements/constexpr_iter.cc:
	New test.
	* testsuite/23_containers/array/requirements/constexpr_iter.cc:
	New test.

2019-06-07  Thomas Rodgers  <trodgers@redhat.com>

	Rename PSTL macro's consistent with libstdc++ (and llvm upstream
	project) standards.
	* include/bits/c++config: Rename all macros of the form __PSTL* to
	_PSTL*.
	* include/std/algorithm: Likewise.
	* include/std/execution: Likewise.
	* include/std/numeric: Likewise.
	* include/std/memory: Likewise.
	* include/pstl/glue_memory_impl.h: Likewise.
	* include/pstl/numeric_impl.h: Likewise.
	* include/pstl/glue_memory_defs.h: Likewise.
	* include/pstl/execution_defs.h: Likewise.
	* include/pstl/utils.h: Likewise.
	* include/pstl/algorithm_fwd.h: Likewise.
	* include/pstl/unseq_backend_simd.h: Likewise.
	* include/pstl/glue_execution_defs.h: Likewise.
	* include/pstl/algorithm_impl.h: Likewise.
	* include/pstl/parallel_impl.h: Likewise.
	* include/pstl/memory_impl.h: Likewise.
	* include/pstl/glue_numeric_defs.h: Likewise.
	* include/pstl/parallel_backend_utils.h: Likewise.
	* include/pstl/glue_algorithm_defs.h: Likewise.
	* include/pstl/parallel_backend.h: Likewise.
	* include/pstl/glue_numeric_impl.h: Likewise.
	* include/pstl/parallel_backend_tbb.h: Likewise.
	* include/pstl/numeric_fwd.h: Likewise.
	* include/pstl/glue_algorithm_impl.h: Likewise.
	* include/pstl/execution_impl.h: Likewise.
	* include/pstl/pstl_config.h: Likewise.
	* testsuite/util/pstl/pstl_test_config.h: Likewise.
	* testsuite/util/pstl/test_utils.h: Likewise.
	* testsuite/20_util/specialized_algorithms/pstl/uninitialized_construct.cc:
	Likewise.
	* testsuite/20_util/specialized_algorithms/pstl/uninitialized_copy_move.cc:
	Likewise.
	* testsuite/26_numerics/pstl/numeric_ops/adjacent_difference.cc:
	Likewise.
	* testsuite/26_numerics/pstl/numeric_ops/scan.cc: Likewise.
	* testsuite/26_numerics/pstl/numeric_ops/transform_scan.cc: Likewise.
	* testsuite/26_numerics/pstl/numeric_ops/reduce.cc: Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/reverse.cc: Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/nth_element.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/find_end.cc: Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/find_if.cc: Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/none_of.cc: Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/count.cc: Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/reverse_copy.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/equal.cc: Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/search_n.cc: Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/find.cc: Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/all_of.cc: Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/find_first_of.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_sorting/is_heap.cc: Likewise.
	* testsuite/25_algorithms/pstl/alg_sorting/partial_sort.cc: Likewise.
	* testsuite/25_algorithms/pstl/alg_sorting/partial_sort_copy.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_sorting/lexicographical_compare.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_merge/inplace_merge.cc: Likewise.
	* testsuite/25_algorithms/pstl/alg_merge/merge.cc: Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/unique_copy_equal.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/replace_copy.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/is_partitioned.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/rotate_copy.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/remove.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/copy_if.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/partition_copy.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/partition.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/copy_move.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/unique.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/rotate.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/any_of.cc: Likewise.

	Rename header guards to be consistent with upstream project's
	conventions.
	* include/pstl/glue_memory_impl.h: Rename all macros of the form
	_PSTL_(.*)_H to _PSTL_\U\1_H.
	* include/pstl/numeric_impl.h: Likewise.
	* include/pstl/glue_memory_defs.h: Likewise.
	* include/pstl/execution_defs.h: Likewise.
	* include/pstl/utils.h: Likewise.
	* include/pstl/algorithm_fwd.h: Likewise.
	* include/pstl/unseq_backend_simd.h: Likewise.
	* include/pstl/glue_execution_defs.h: Likewise.
	* include/pstl/algorithm_impl.h: Likewise.
	* include/pstl/parallel_impl.h: Likewise.
	* include/pstl/memory_impl.h: Likewise.
	* include/pstl/glue_numeric_defs.h: Likewise.
	* include/pstl/parallel_backend_utils.h: Likewise.
	* include/pstl/glue_algorithm_defs.h: Likewise.
	* include/pstl/parallel_backend.h: Likewise.
	* include/pstl/glue_numeric_impl.h: Likewise.
	* include/pstl/parallel_backend_tbb.h: Likewise.
	* include/pstl/numeric_fwd.h: Likewise.
	* include/pstl/glue_algorithm_impl.h: Likewise.
	* include/pstl/execution_impl.h: Likewise.
	* include/pstl/pstl_config.h: Likewise.
	* testsuite/util/pstl/pstl_test_config.h: Likewise.

	Synchronize libstdc++ parallel algorithms with upstream
	project.
	* include/pstl/algorithm_fwd.h: Synchronize with
	upstream PSTL project.
	* include/pstl/algorithm_impl.h: Likewise.
	* include/pstl/execution_defs.h: Likewise.
	* include/pstl/execution_impl.h: Likewise.
	* include/pstl/glue_algorithm_impl.h: Likewise.
	* include/pstl/glue_execution_defs.h: Likewise.
	* include/pstl/numeric_fwd.h: Likewise.
	* include/pstl/numeric_impl.h: Likewise.
	* include/pstl/parallel_backend.h: Likewise.
	* include/pstl/pstl_config.h: Likewise.
	* include/pstl/unseq_backend_simd.h: Likewise.
	* include/pstl/parallel_backend_serial.h: New file.
	* include/Makefile.am (pstl_headers): Add
	parallel_backend_serial.h.
	* include/Makefile.in: Regenerate.

	Clean up non-conforming names
	* include/pstl/algorithm_impl.h (__parallel_set_union_op):
	Uglfiy copy_range1 and copy_range2
	(__pattern_walk2_n): Rename local n to __n
	* include/pstl/parallel_backend_tbb.h (struct __binary_no_op):
	Rename parameter _T to _Tp.

	Integrate non-TBB serial backend support
	* include/bits/c++config: Adjust TBB detection logic to select serial
	PSTL backend if no TBB present.
	* testsuite/utils/pstl/test_utils.h: Remove check for
	_PSTL_USE_PAR_POLICIES

2019-06-07  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/24_iterators/container_access.cc: Move dg-options before
	dg-do directive so the target check uses the -std option.

	PR libstdc++/90770
	* configure: Regenerate.
	* src/Makefile.am (stamp-debug): Also test for missing makefile.
	* src/Makefile.in: Regenerate.

2019-06-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/array: Do not include <stdexcept>.
	* include/std/optional: Include <exception> and
	<bits/exception_defines.h> instead of <stdexcept>.
	* testsuite/20_util/function_objects/searchers.cc: Include <cctype>
	for std::isalnum.
	* testsuite/20_util/tuple/cons/deduction.cc: Include <memory> for
	std::allocator.
	* testsuite/23_containers/map/erasure.cc: Include <string>.
	* testsuite/23_containers/unordered_map/erasure.cc: Likewise.

	* testsuite/23_containers/deque/requirements/dr438/assign_neg.cc: Add
	dg-prune-output for different C++98 diagnostic.
	* testsuite/23_containers/deque/requirements/dr438/constructor_1_neg.cc:
	Likewise.
	* testsuite/23_containers/deque/requirements/dr438/constructor_2_neg.cc:
	Likewise.
	* testsuite/23_containers/deque/requirements/dr438/insert_neg.cc:
	Likewise.
	* testsuite/23_containers/list/requirements/dr438/assign_neg.cc:
	Likewise.
	* testsuite/23_containers/list/requirements/dr438/constructor_1_neg.cc:
	Likewise.
	* testsuite/23_containers/list/requirements/dr438/constructor_2_neg.cc:
	Likewise.
	* testsuite/23_containers/list/requirements/dr438/insert_neg.cc:
	Likewise.
	* testsuite/23_containers/vector/requirements/dr438/assign_neg.cc:
	Likewise.
	* testsuite/23_containers/vector/requirements/dr438/
	constructor_1_neg.cc: Likewise.
	* testsuite/23_containers/vector/requirements/dr438/
	constructor_2_neg.cc: Likewise.
	* testsuite/23_containers/vector/requirements/dr438/insert_neg.cc:
	Likewise.
	* testsuite/libstdc++-prettyprinters/compat.cc: Do not run for C++98.

	* testsuite/23_containers/unordered_map/requirements/debug_container.cc:
	Do not test allocator rebinding extension for C++2a.
	* testsuite/23_containers/unordered_set/allocator/ext_ptr.cc: Change
	dg-do directive for C++17 and C++2a.

	* testsuite/23_containers/deque/requirements/explicit_instantiation/
	1_c++0x.cc: Remove redundant test.
	* testsuite/23_containers/deque/requirements/explicit_instantiation/
	2.cc: Use target selector instead of preprocessor condition.
	* testsuite/23_containers/deque/requirements/explicit_instantiation/
	3.cc: Do not run test for C++2a.
	* testsuite/23_containers/forward_list/requirements/
	explicit_instantiation/3.cc: Likewise.
	* testsuite/23_containers/forward_list/requirements/
	explicit_instantiation/5.cc: Do not test allocator rebinding extension
	for C++2a.
	* testsuite/23_containers/list/requirements/explicit_instantiation/
	1_c++0x.cc: Remove redundant test.
	* testsuite/23_containers/list/requirements/explicit_instantiation/
	2.cc: Use target selector instead of preprocessor condition.
	* testsuite/23_containers/list/requirements/explicit_instantiation/
	3.cc: Do not run test for C++2a.
	* testsuite/23_containers/list/requirements/explicit_instantiation/
	5.cc: Do not test allocator rebinding extension for C++2a.
	* testsuite/23_containers/map/requirements/explicit_instantiation/
	1_c++0x.cc: Remove redundant test.
	* testsuite/23_containers/map/requirements/explicit_instantiation/
	2.cc: Adjust comment.
	* testsuite/23_containers/map/requirements/explicit_instantiation/
	3.cc: Do not run test for C++2a.
	* testsuite/23_containers/map/requirements/explicit_instantiation/
	5.cc: Do not test allocator rebinding extension for C++2a.
	* testsuite/23_containers/multimap/requirements/explicit_instantiation/
	1_c++0x.cc: Remove redundant test.
	* testsuite/23_containers/multimap/requirements/explicit_instantiation/
	3.cc: Do not run test for C++2a.
	* testsuite/23_containers/multimap/requirements/explicit_instantiation/
	5.cc: Do not test allocator rebinding extension for C++2a.
	* testsuite/23_containers/multiset/requirements/explicit_instantiation/
	3.cc: Do not run test for C++2a.
	* testsuite/23_containers/multiset/requirements/explicit_instantiation/
	5.cc: Do not test allocator rebinding extension for C++2a.
	* testsuite/23_containers/set/requirements/explicit_instantiation/3.cc:
	Do not run test for C++2a.
	* testsuite/23_containers/set/requirements/explicit_instantiation/
	1_c++0x.cc: Remove redundant test.
	* testsuite/23_containers/set/requirements/explicit_instantiation/5.cc:
	Do not test allocator rebinding extension for C++2a.
	* testsuite/23_containers/unordered_map/requirements/
	explicit_instantiation/3.cc: Likewise.
	* testsuite/23_containers/unordered_map/requirements/
	explicit_instantiation/5.cc: Do not test allocator rebinding extension
	for C++2a.
	* testsuite/23_containers/unordered_multimap/requirements/
	explicit_instantiation/3.cc: Do not run test for C++2a.
	* testsuite/23_containers/unordered_multimap/requirements/
	explicit_instantiation/5.cc: Do not test allocator rebinding extension
	for C++2a.
	* testsuite/23_containers/unordered_multiset/requirements/
	explicit_instantiation/3.cc: Do not run test for C++2a.
	* testsuite/23_containers/unordered_multiset/requirements/
	explicit_instantiation/5.cc: Do not test allocator rebinding extension
	for C++2a.
	* testsuite/23_containers/unordered_set/requirements/
	explicit_instantiation/3.cc: Do not run test for C++2a.
	* testsuite/23_containers/unordered_set/requirements/
	explicit_instantiation/5.cc: Do not test allocator rebinding extension
	for C++2a.
	* testsuite/23_containers/vector/ext_pointer/explicit_instantiation/
	2.cc: Remove redundant test.
	* testsuite/23_containers/vector/ext_pointer/explicit_instantiation/
	3.cc: Do not run test for C++2a.
	* testsuite/23_containers/vector/requirements/explicit_instantiation/
	3.cc: Likewise.

	* include/std/type_traits (is_empty, is_polymorphic, is_final)
	(is_abstract, is_aggregate): Remove static_assert.
	* testsuite/20_util/is_abstract/incomplete_neg.cc: Check for error
	from builtin only.
	* testsuite/20_util/is_aggregate/incomplete_neg.cc: Likewise. Add
	missing -std=gnu++17 option.
	* testsuite/20_util/is_empty/incomplete_neg.cc: New test.
	* testsuite/20_util/is_final/incomplete_neg.cc: New test.
	* testsuite/20_util/is_polymorphic/incomplete_neg.cc: Check for error
	from builtin only.

	* testsuite/18_support/set_terminate.cc: Do not run for C++98 mode.
	* testsuite/18_support/set_unexpected.cc: Likewise.
	* testsuite/20_util/is_nothrow_invocable/value.cc: Test converting to
	void.
	* testsuite/20_util/is_nothrow_invocable/value_ext.cc: Fix constexpr
	function to be valid in C++11.
	* testsuite/26_numerics/complex/proj.cc: Do not run for C++98 mode.
	* testsuite/experimental/names.cc: Do not run for C++98 mode. Do not
	include Library Fundamentals or Networking headers in C++11 mode.
	* testsuite/ext/char8_t/atomic-1.cc: Do not run for C++98 mode.

	* include/std/tuple (_TC): Replace with _TupleConstraints.
	(_TupleConstraints): New helper for SFINAE constraints, with more
	expressive member functions to reduce duplication when used.
	(tuple::_TC2, tuple::_TMC, tuple::_TNTC): Remove.
	(tuple::_TCC): Replace dummy type parameter with bool non-type
	parameter that can be used to check the pack size.
	(tuple::_ImplicitDefaultCtor, tuple::_ExplicitDefaultCtor)
	(tuple::_ImplicitCtor, tuple::_ExplicitCtor): New alias templates for
	checking constraints in constructors.
	(tuple::__valid_args, tuple::_UseOtherCtor, tuple::__use_other_ctor):
	New SFINAE helpers.
	(tuple::tuple): Use new helpers to reduce repitition in constraints.
	(tuple::tuple(allocator_arg_t, const Alloc&)): Constrain.
	(tuple<T1, T2>::_TCC, tuple<T1, T2>::_ImplicitDefaultCtor)
	(tuple<T1, T2>::_ExplicitDefaultCtor, tuple<T1, T2>::_ImplicitCtor)
	(tuple<T1, T2>::_ExplicitCtor): New alias templates for checking
	constraints in constructors.
	(tuple::__is_alloc_arg()): New SFINAE helpers.
	(tuple<T1, T2>::tuple): Use new helpers to reduce repitition in
	constraints.
	(tuple<T1, T2>::tuple(allocator_arg_t, const Alloc&)): Constrain.
	* testsuite/20_util/tuple/cons/90700.cc: New test.
	* testsuite/20_util/tuple/cons/allocators.cc: Add default constructor
	to meet new constraint on allocator-extended default constructor.

2019-06-03  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_map.h (map): Disable static assert for C++98 mode.
	* include/bits/stl_multimap.h (multimap): Likewise.

2019-06-03  François Dumont  <fdumont@gcc.gnu.org>

	Rename variables and cleanup comments.
	* include/bits/hashtable_policy.h
	* include/bits/hashtable.h

2019-06-03  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2020.xml: Add missing row for P0920R2.
	Fix bgcolor for P0340R3.
	* doc/html/*: Regenerate.

	PR libstdc++/90686
	* doc/xml/manual/status_cxx2014.xml: Document what's missing from
	<experimental/memory_resource>.
	* doc/xml/manual/status_cxx2020.xml: Document status of P1285R0,
	P0339R6, P0340R3, P1164R1 and P1357R1.
	* doc/html/*: Regenerate.

	* doc/xml/manual/status_cxx2020.xml: Document P1463R1 status.
	* include/bits/forward_list.h [__cplusplus > 201703]: Enable
	allocator::value_type assertion for C++2a.
	* include/bits/hashtable.h: Likewise.
	* include/bits/stl_deque.h: Likewise.
	* include/bits/stl_list.h: Likewise.
	* include/bits/stl_map.h: Likewise.
	* include/bits/stl_multimap.h: Likewise.
	* include/bits/stl_multiset.h: Likewise.
	* include/bits/stl_set.h: Likewise.
	* include/bits/stl_vector.h: Likewise.
	* testsuite/23_containers/deque/48101-3_neg.cc: New test.
	* testsuite/23_containers/forward_list/48101-3_neg.cc: New test.
	* testsuite/23_containers/list/48101-3_neg.cc: New test.
	* testsuite/23_containers/map/48101-3_neg.cc: New test.
	* testsuite/23_containers/multimap/48101-3_neg.cc: New test.
	* testsuite/23_containers/multiset/48101-3_neg.cc: New test.
	* testsuite/23_containers/set/48101-3_neg.cc: New test.
	* testsuite/23_containers/unordered_map/48101-3_neg.cc: New test.
	* testsuite/23_containers/unordered_multimap/48101-3_neg.cc: New test.
	* testsuite/23_containers/unordered_multiset/48101-3_neg.cc: New test.
	* testsuite/23_containers/unordered_set/48101-3_neg.cc: New test.
	* testsuite/23_containers/vector/48101-3_neg.cc: New test.

2019-05-31  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/allocator.xml: Move hoard.org back to http.

2019-05-31  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/tuple (tuple<>): Add noexcept to allocator-extended
	constructors.
	(tuple<T1, T2>::__nothrow_default_constructible()): New helper
	function.
	(tuple<T1, T2>::tuple(), explicit tuple<T1, T2>::tuple()): Use helper.

2019-05-31  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++98/bitmap_allocator.cc: Add using-declaration for size_t.

	PR libstdc++/90682
	* libsupc++/eh_term_handler.cc: Include eh_term_handler.h to get
	definition of _GLIBCXX_DEFAULT_TERM_HANDLER.
	* libsupc++/eh_term_handler.h: New header defining
	_GLIBCXX_DEFAULT_TERM_HANDLER.
	* libsupc++/eh_terminate.cc: Include eh_term_handler.h.
	(set_terminate): Restore default handler when argument is null.
	(set_unexpected): Likewise.
	* testsuite/18_support/set_terminate.cc: New test.
	* testsuite/18_support/set_unexpected.cc: New test.

	* include/backward/hashtable.h (size_t, ptrdiff_t)
	(forward_iterator_tag, input_iterator_tag, _Construct, _Destroy)
	(distance, vector, pair, __iterator_category): Remove
	using-declarations that add these names to namespace __gnu_cxx.
	* include/ext/bitmap_allocator.h (size_t, ptrdiff_t): Likewise.
	* include/ext/debug_allocator.h (size_t): Likewise.
	* include/ext/functional (size_t, unary_function, binary_function)
	(mem_fun1_t, const_mem_fun1_t, mem_fun1_ref_t, const_mem_fun1_ref_t):
	Likewise.
	* include/ext/malloc_allocator.h (size_t, ptrdiff_t): Likewise.
	* include/ext/memory (ptrdiff_t, pair, __iterator_category): Likewise.
	* include/ext/mt_allocator.h (size_t, ptrdiff_t): Likewise.
	* include/ext/new_allocator.h (size_t, ptrdiff_t): Likewise.
	* include/ext/numeric (iota): Fix outdated comment.
	* include/ext/pool_allocator.h (size_t, ptrdiff_t): Likewise.
	* include/ext/rb_tree (_Rb_tree, allocator): Likewise.
	* include/ext/rope (size_t, ptrdiff_t, allocator, _Destroy): Likewise.
	* include/ext/ropeimpl.h (size_t, printf, basic_ostream)
	(__throw_length_error, _Destroy, std::__uninitialized_fill_n_a):
	Likewise.
	* include/ext/slist (size_t, ptrdiff_t, _Construct, _Destroy)
	(allocator, __true_type, __false_type): Likewise.

2019-05-31  Antony Polukhin  <antoshkka@gmail.com>

	PR libstdc++/71579
	* include/std/type_traits __type_identity, __is_complete_or_unbounded):
	New helpers for checking preconditions in traits.
	(is_trivial, is_trivially_copyable, is_standard_layout, is_pod)
	(is_literal_type, is_empty, is_polymorphic, is_final, is_abstract)
	(is_destructible, is_nothrow_destructible, is_constructible)
	(is_default_constructible, is_copy_constructible)
	(is_move_constructible, is_nothrow_default_constructible)
	(is_nothrow_constructible, is_nothrow_copy_constructible)
	(is_nothrow_move_constructible, is_copy_assignable, is_move_assignable)
	(is_nothrow_assignable, is_nothrow_copy_assignable)
	(is_nothrow_move_assignable, is_trivially_constructible)
	(is_trivially_copy_constructible, is_trivially_move_constructible)
	is_trivially_assignable, is_trivially_copy_assignable)
	(is_trivially_move_assignable, is_trivially_destructible)
	(alignment_of, is_swappable, is_nothrow_swappable, is_invocable)
	(is_invocable_r, is_nothrow_invocable)
	(has_unique_object_representations, is_aggregate): Add static_asserts
	to make sure that type traits are not misused with incomplete types.
	(__is_constructible_impl, __is_nothrow_default_constructible_impl)
	(__is_nothrow_constructible_impl, __is_nothrow_assignable_impl): New
	base characteristics without assertions that can be reused in other
	traits.
	* testsuite/20_util/is_complete_or_unbounded/memoization.cc: New test.
	* testsuite/20_util/is_complete_or_unbounded/memoization_neg.cc: New
	test.
	* testsuite/20_util/is_complete_or_unbounded/value.cc: New test.
	* testsuite/20_util/is_abstract/incomplete_neg.cc: New test.
	* testsuite/20_util/is_aggregate/incomplete_neg.cc: New test.
	* testsuite/20_util/is_class/value.cc: Check incomplete type.
	* testsuite/20_util/is_function/value.cc: Likewise.
	* testsuite/20_util/is_move_constructible/incomplete_neg.cc: New test.
	* testsuite/20_util/is_nothrow_move_assignable/incomplete_neg.cc: New
	test.
	* testsuite/20_util/is_polymorphic/incomplete_neg.cc: New test.
	* testsuite/20_util/is_reference/value.cc: Check incomplete types.
	* testsuite/20_util/is_unbounded_array/value.cc: Likewise.
	* testsuite/20_util/is_union/value.cc: Likewise.
	* testsuite/20_util/is_void/value.cc: Likewise.
	* testsuite/util/testsuite_tr1.h: Add incomplete union type.

2019-05-31  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/random.h (random_device::_M_init(const char*, size_t)):
	Add new private member function.
	* src/c++11/cow-string-inst.cc (random_device::_M_init(const string&))
	(random_device::_M_init_pretr1(const string&)): Call new private
	member with string data.
	* src/c++11/random.cc (random_device::_M_init(const char*, size_t)):
	Define.
	* testsuite/26_numerics/random/random_device/cons/default-cow.cc: New
	test using COW strings.
	* testsuite/26_numerics/random/random_device/cons/default.cc: Generate
	a value from the device.
	* testsuite/26_numerics/random/random_device/cons/token.cc: Likewise.
	Fix typo in token string.

2019-05-30  Nina Dinka Ranns  <dinka.ranns@gmail.com>

	LWG2788 basic_string spurious use of a default constructible allocator
	* include/bits/basic_string.tcc [_GLIBCXX_USE_CXX11_ABI]
	(basic_string::_M_replace_dispatch): Construct temporary string with
	the current allocator.
	* testsuite/21_strings/basic_string/allocator/char/lwg2788.cc: New.
	* testsuite/21_strings/basic_string/allocator/wchar_t/lwg2788.cc: New.

2019-05-30  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/diagnostics.xml: Update list of headers that define
	exception classes.
	* doc/xml/manual/support.xml: Rewrite advice around NULL. Rewrite
	section about new/delete overloads. Improve section on verbose
	terminate handler.
	* doc/html/*: Regenerate.

	* doc/xml/manual/status_cxx2020.xml: Add feature-test macro for
	P0811R3. Change status of P1353R0.
	* doc/html/*: Regenerate.

	* doc/xml/manual/status_cxx2011.xml: Use <variablelist> for
	documentation of implementation-defined types for [thread.req.native].
	* doc/xml/manual/status_cxx2017.xml: Update documentation of
	implementation-defined strings for [variant.bad.access]. Fix typo in
	documentation of implementation-defined support for [fs.conform.9945].
	* doc/html/*: Regenerate.

2019-05-29  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/85494
	* testsuite/26_numerics/random/random_device/cons/token.cc: Fix test
	that fails on mingw-w64.

	PR libstdc++/88881
	* src/c++17/fs_ops.cc [_GLIBCXX_FILESYSTEM_IS_WINDOWS]
	(status(const path&, error_code&)): Use parent_path() to remove
	trailing slash.
	(symlink_status(const path&, error_code&)): Duplicate workaround for
	bug in _wstat for paths with trailing slash.
	* testsuite/27_io/filesystem/operations/remove_all.cc: Check path
	with trailing slash.
	* testsuite/27_io/filesystem/operations/status.cc: Likewise.
	* testsuite/27_io/filesystem/operations/symlink_status.cc: Likewise.

	* src/c++17/fs_path.cc (path::parent_path()): Create whole path at
	once instead of building it iteratively.

	* testsuite/util/testsuite_api.h: Remove names of unused parameters.

	PR libstdc++/85494 use rdseed and rand_s in std::random_device
	* acinclude.m4 (GLIBCXX_CHECK_X86_RDSEED): Define macro to check if
	the assembler supports rdseed.
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* configure.ac: Use GLIBCXX_CHECK_X86_RDSEED.
	* config/os/mingw32-w64/os_defines.h (_GLIBCXX_USE_CRT_RAND_S): Define.
	* doc/html/*: Regenerate.
	* doc/xml/manual/status_cxx2011.xml: Document new tokens.
	* include/bits/random.h (random_device::random_device()): Always call
	_M_init rather than _M_init_pretr1.
	(random_device::random_device(const string&)): Likewise.
	(random_device::operator()()): Always call _M_getval().
	(random_device::_M_file): Replace first member of union with an
	anonymous struct, with _M_file as its first member.
	* src/c++11/random.cc [_GLIBCXX_X86_RDRAND] (USE_RDRAND): Define.
	[_GLIBCXX_X86_RDSEED] (USE_RDSEED): Define.
	(USE_MT19937): Define if none of the above are defined.
	(USE_POSIX_FILE_IO): Define.
	(_M_strtoul): Remove.
	[USE_RDSEED] (__x86_rdseed): Define new function.
	[_GLIBCXX_USE_CRT_RAND_S] (__winxp_rand_s): Define new function.
	(random_device::_M_init(const string&)): Initialize new union members.
	Add support for "rdseed" and "rand_s" tokens. Decide what the
	"default" token does according to which USE_* macros are defined.
	[USE_POSIX_FILE_IO]: Store a file descriptor.
	[USE_MT19937]: Forward to _M_init_pretr1 instead.
	(random_device::_M_init_pretr1(const string&)) [USE_MT19937]: Inline
	code from _M_strtoul.
	[!USE_MT19937]: Call _M_init, transforming the old default token or
	numeric tokens to "default".
	(random_device::_M_fini()) [USE_POSIX_FILE_IO]: Use close not fclose.
	(random_device::_M_getval()): Use new union members to obtain a
	random number from the stored function pointer or file descriptor.
	[USE_MT19937]: Obtain a value from the mt19937 engine.
	(random_device::_M_getval_pretr1()): Call _M_getval().
	(random_device::_M_getentropy()) [USE_POSIX_FILE_IO]: Use _M_fd
	instead of fileno.
	[!USE_MT19937] (mersenne_twister): Do not instantiate when not needed.
	* testsuite/26_numerics/random/random_device/85494.cc: New test.

2019-05-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/90634
	* include/experimental/bits/fs_path.h (path::path(path&&)): Only call
	_M_split_cmpts() for a path with multiple components.
	(path::_S_is_dir_sep()): Add missing 'static' keyword to function.
	* src/filesystem/path.cc (path::_M_split_cmpts()): Count number of
	components and reserve space in vector. Return early when there is
	only one component.
	* testsuite/27_io/filesystem/path/construct/90634.cc: New test.
	* testsuite/experimental/filesystem/path/construct/90634.cc: New test.

	* testsuite/util/testsuite_fs.h (compare_paths): Use three-argument
	form of std::equals for C++11 compatibility.

2019-05-26  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/appendix_contributing.xml: Update pointer to
	C++ standard at ansi.org.

2019-05-24  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/numeric (midpoint(T*, T*)): Fix incorrect result.
	* testsuite/26_numerics/midpoint/pointer.cc: Change "compile" test
	to "run".

	* testsuite/20_util/shared_ptr/cons/alias-rval.cc: Fix test.
	* testsuite/20_util/shared_ptr/cons/alias.cc: Remove unused function.

2019-05-23  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/function_objects/invoke/1.cc: Move C++17-specific
	tests to ...
	* testsuite/20_util/function_objects/invoke/3.cc: New test.
	* testsuite/23_containers/unordered_set/allocator/ext_ptr.cc: Change
	"compile" test to "run".

	* doc/xml/manual/intro.xml: Document LWG DR 2996 change.
	* doc/html/*: Regenerate.
	* include/bits/shared_ptr.h (shared_ptr(shared_ptr&&, T*)): Add
	rvalue aliasing constructor.
	(static_pointer_cast, const_pointer, dynamic_pointer_cast)
	(reinterpret_pointer_cast): Add overloads taking rvalues.
	* include/bits/shared_ptr_base.h (__shared_ptr(__shared_ptr&&, T*)):
	Add rvalue aliasing constructor.
	* testsuite/20_util/shared_ptr/casts/1.cc: Change "compile" test to
	"run" and check return values as well as types.
	* testsuite/20_util/shared_ptr/casts/reinterpret.cc: Likewise.
	* testsuite/20_util/shared_ptr/casts/rval.cc: New test.
	* testsuite/20_util/shared_ptr/cons/alias-rval.cc: New test.
	* testsuite/20_util/shared_ptr/cons/alias.cc: Remove unused return
	values.

	* doc/xml/manual/evolution.xml: Document LWG DR 2921 change.
	* doc/xml/manual/intro.xml: Likewise.
	* include/std/future (__create_task_state): Add default arguments
	to make providing an allocator optional.
	(packaged_task::packaged_task(F&&)): Call __create_task_state directly
	instead of delegating to another constructor.
	(packaged_task::packaged_task(allocator_arg_t, const A&, ...)): Do not
	define allocator-extended constructors for C++17 and later.
	* testsuite/30_threads/packaged_task/cons/alloc.cc: Only run test for
	C++11 and C++14.
	* testsuite/30_threads/packaged_task/cons/alloc2.cc: Likewise.
	* testsuite/30_threads/packaged_task/cons/alloc_min.cc: Likewise.
	* testsuite/30_threads/packaged_task/uses_allocator.cc: Likewise.

2019-05-23  Hans-Peter Nilsson  <hp@axis.com>

	* testsuite/26_numerics/random/poisson_distribution/operators/values.cc:
	Don't run the libstdc++/83237 part on simulator targets.

2019-05-23  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2017.xml: Add feature test macro for
	P0040R3.
	* doc/html/*: Regenerate.

	* include/experimental/any (__any_caster): Use RTTI if comparing
	addresses fails, to support non-unique addresses in shared libraries.
	* include/std/any (__any_caster): Likewise.

	PR libstdc++/90220
	* include/experimental/any (__any_caster): Constrain to only be
	callable for object types. Use remove_cv_t instead of decay_t.
	If the type decays or isn't copy constructible, compare the manager
	function to a dummy specialization.
	(__any_caster): Add overload constrained for non-object types.
	(any::_Manager_internal<_Op>): Add dummy specialization.
	* testsuite/experimental/any/misc/any_cast.cc: Test function types
	and array types.

2019-05-22  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/90557
	* src/c++17/fs_path.cc (path::_List::operator=(const _List&)): Fix
	reversed arguments to uninitialized_copy_n.
	* testsuite/27_io/filesystem/path/assign/copy.cc: Check that source
	is unchanged by copy assignment.
	* testsuite/util/testsuite_fs.h (compare_paths): Use std::equal to
	compare path components.

	PR libstdc++/77691
	* include/experimental/memory_resource: Add system header pragma and
	do not define anything unless compiled as C++14 or later.
	(__resource_adaptor_common::__guaranteed_alignment): Remove.
	(__resource_adaptor_imp::do_allocate): If the requested alignment
	is a fundamental alignment then either allocate directly from _M_alloc
	or call the new _M_allocate function.
	(__resource_adaptor_imp::do_deallocate): Likewise for deallocation.
	(__resource_adaptor_imp::_M_allocate): New function that uses a copy
	of the allocator rebound to a POD type with the specified alignment.
	(__resource_adaptor_imp::_M_deallocate): Likewise for deallocation.
	* testsuite/experimental/memory_resource/new_delete_resource.cc:
	Adjust expected allocation sizes.
	* testsuite/experimental/memory_resource/resource_adaptor.cc: Remove
	xfail for Solaris x86.

2019-05-21  Thomas Rodgers  <trodgers@redhat.com>

	LWG 3062 - Unnecessary decay_t in is_execution_policy_v
	* include/pstl/execution_defs.h (__enable_if_execution_policy):
	Use std::__remove_cvref_t when building with GCC.

2019-05-21  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/90252
	* testsuite/lib/libstdc++.exp (check_effective_target_tbb-backend):
	Use "additional_flags" to pass -ltbb to v3_target_compile command.
	Use check_v3_target_prop_cached to cache the result of the test.

	* doc/xml/manual/shared_ptr.xml: Fix names of lock policy constants.

2019-05-20  Thomas Rodgers  <trodgers@redhat.com>

	PR libstdc++/90252
	* testsuite/lib/libstdc++.exp (check_effective_target_tbb-backend):
	Changed v3_target_compile check from preprocess to executable.
	Added "-ltbb" to v3_target_compile flags.

2019-05-20  Thomas Rodgers  <trodgers@redhat.com>

	* testsuite/lib/libstdc++.exp (check_effective_target_tbb-backend):
	Add check for Thread Building Blocks 2018 or later.

2019-05-20  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/experimental/names.cc: Only include Networking TS headers
	on targets with the necessary Gthreads support.

2019-05-20  Marek Polacek  <polacek@redhat.com>

	CWG 2094 - volatile scalars are trivially copyable.
	PR c++/85679
	* testsuite/20_util/is_trivially_copyable/value.cc: Change the expected
	result for volatile int.

2019-05-20  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/17_intro/names.cc: Do not check 'ptr' on Solaris.
	* testsuite/experimental/names.cc: Include <experimental/filesystem>
	conditionally.

	PR c++/90532 Ensure __is_constructible(T[]) is false
	* include/std/type_traits (__do_is_default_constructible_impl)
	(__is_default_constructible_atom, __is_default_constructible_safe):
	Remove.
	(is_default_constructible): Use is_constructible.
	* testsuite/20_util/is_constructible/value.cc: Check int[] case.
	* testsuite/20_util/is_default_constructible/value.cc: Likewise.
	* testsuite/20_util/is_trivially_constructible/value.cc: Likewise.
	* testsuite/20_util/is_trivially_default_constructible/value.cc:
	Likewise.

2019-05-20  Pádraig Brady  <pbrady@fb.com>

	* libstdc++-v3/include/ext/new_allocator.h (deallocate): Pass the size
	to the deallocator with -fsized-deallocation.

2019-05-20  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/experimental/memory_resource/new_delete_resource.cc: Fix
	test by passing correct alignment to deallocate function.

2019-05-18  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/90520
	* python/libstdcxx/v6/printers.py (UniquePointerPrinter.__init__):
	Raise exception if unique_ptr tuple member has unknown structure.
	* python/libstdcxx/v6/xmethods.py (UniquePtrGetWorker.__call__):
	Adjust worker to support new __uniq_ptr_data base class. Do not
	assume field called _M_head_impl is the first tuple element.

2019-05-17  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/stl_deque.h
	(_Deque_iterator<>::__ptr_to): Remove, use std::__ptr_rebind.
	(_Deque_base(_Deque_base&&, const allocator_type&)): New.
	(_Deque_base::_Deque_impl_data): New.
	(_Deque_base::_Deque_impl): Inherit latter.
	(_Deque_base::_Deque_impl::_M_swap_data): Move...
	(_Deque_base::_Deque_impl_data::_M_swap_data): ... here.
	(_Deque_base::_Deque_impl()): Add noexcept qualification.
	(_Deque_base::_Deque_impl(_Deque_impl&&, _Tp_alloc_type&&)): New.
	(_Deque_base::_Deque_impl::_M_get_Tp_allocator()): Remove static_cast.
	(deque<>::deque()): Default.
	(deque<>::deque(deque&&)): Default.
	(deque<>::deque(deque&&, const allocator_type&, false_type)): New.
	(deque<>::deque(deque&&, const allocator_type&, true_type)): New.
	(deque<>::deque(deque&&, const allocator_type&)): Delegate to latters.
	(deque<>::deque<_It>(_It, _It, const allocator_type&)): Use
	_M_range_initialize.
	(deque<>::assign<_It>(_It, _It)): Use _M_assign_aux.
	(deque<>::resize(size_type, const value_type&)): Share a single
	implementation.
	(deque<>::insert<_It>(const_iterator, _It, _It)): Use
	_M_range_insert_aux.
	[__cplusplus >= 201103L](_M_initialize_dispatch): Remove.
	[__cplusplus >= 201103L](_M_assign_dispatch): Remove.
	[__cplusplus >= 201103L](_M_insert_dispatch): Remove.
	* testsuite/23_containers/deque/allocator/default_init.cc: New.

2019-05-17  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/90246
	* include/std/variant (holds_alternative, get, get_if): Improve
	static assertion messages.
	(bad_variant_access::bad_variant_access()): Change default message.
	(__throw_bad_variant_access(bool)): New overload.
	(get): Use new overload.
	(visit, visit<R>): Improve exception message.

	* testsuite/20_util/variant/compile.cc: Fix narrowing test for ILP32
	targets. Add more cases from P0608R3.
	* testsuite/20_util/variant/run.cc: Add more cases from P0608R3.

	* include/bits/random.h (seed_seq::param): Fix non-reserved name.
	* include/experimental/type_traits (is_detected_exact)
	(is_detected_exact_v): Likewise.
	* include/pstl/execution_defs.h (is_execution_policy)
	(is_execution_policy_v, __enable_if_execution_policy): Likewise.
	* include/pstl/execution_impl.h (__policy_traits): Likewise.
	* testsuite/17_intro/names.cc: Check for more non-reserved names.
	* testsuite/experimental/names.cc: New test.

	PR libstdc++/85965
	* include/bits/hashtable.h (_Hashtable::~_Hashtable()): Remove static
	assertions from the destructor.
	* include/bits/hashtable_policy.h (_Hash_code_base::_M_hash_code):
	Move static_assert for hash function to here.
	(_Hash_table_base::_M_equals): Move static_assert for equality
	predicate to here.
	* include/bits/stl_tree.h (_Rb_tree::_S_value(_Const_Link_type)):
	Remove.
	(_Rb_tree::_S_key(_Const_Link_type)): Move assertions here. Access
	the value directly instead of calling _S_value.
	(_Rb_tree::_S_value(_Const_Base_ptr)): Remove.
	(_Rb_tree::_S_key(_Const_Base_ptr)): Do downcast and forward to
	_S_key(_Const_Link_type).
	* testsuite/23_containers/set/85965.cc: Check construction,
	destruction, assignment and size() do not trigger the assertions.
	* testsuite/23_containers/unordered_set/85965.cc: Likewise.
	* testsuite/23_containers/map/48101_neg.cc: Call find and adjust
	expected errors.
	* testsuite/23_containers/multimap/48101_neg.cc: Likewise.
	* testsuite/23_containers/multiset/48101_neg.cc: Likewise.
	* testsuite/23_containers/set/48101_neg.cc: Likewise.
	* testsuite/23_containers/unordered_map/48101_neg.cc: Likewise.
	* testsuite/23_containers/unordered_multimap/48101_neg.cc: Likewise.
	* testsuite/23_containers/unordered_multiset/48101_neg.cc: Likewise.
	* testsuite/23_containers/unordered_set/48101_neg.cc: Likewise.

	* include/bits/invoke.h [__cplusplus < 201703L] (__invoke_r<void>):
	Use _GLIBCXX14_CONSTEXPR because void functions cannot be constexpr
	in C++11.

	* doc/xml/manual/status_cxx2020.xml: Update P0608R3, P0777R1, and
	P1165R1 entries.
	* doc/html/*: Regenerate.
	* include/std/tuple (make_from_tuple): Use remove_reference_t instead
	of decay_t (P0777R1).

2019-05-17  François Dumont  <fdumont@gcc.gnu.org>

	Move from state of allocators (LWG2593)
	* include/bits/stl_deque.h
	(_Deque_base(_Deque_base&&, false_type)): Remove.
	(_Deque_base(_Deque_base&&, true_type)): Remove.
	(_Deque_base(_Deque_base&&)): Adapt.
	(_Deque_base::_M_move_impl()): Remove.
	* testsuite/util/testsuite_allocator.h
	(propagating_allocator(propagating_allocator&&)): Preserve move from
	state.
	* testsuite/23_containers/deque/allocator/move_assign.cc (test02):
	Adapt.
	* testsuite/23_containers/forward_list/allocator/move_assign.cc (test02):
	Adapt.
	* testsuite/23_containers/list/allocator/move_assign.cc (test02): Adapt.
	* testsuite/23_containers/map/allocator/move_assign.cc (test02): Adapt.
	* testsuite/23_containers/multimap/allocator/move_assign.cc (test02):
	Adapt.
	* testsuite/23_containers/multiset/allocator/move_assign.cc (test02):
	Adapt.
	* testsuite/23_containers/set/allocator/move_assign.cc (test02): Adapt.
	* testsuite/23_containers/unordered_map/allocator/move_assign.cc
	(test02): Adapt.
	* testsuite/23_containers/unordered_multimap/allocator/move_assign.cc
	(test02): Adapt.
	* testsuite/23_containers/unordered_multiset/allocator/move_assign.cc
	(test02): Adapt.
	* testsuite/23_containers/unordered_set/allocator/move_assign.cc
	(test02): Adapt.
	* testsuite/23_containers/vector/allocator/move_assign.cc (test02):
	Adapt.
	* testsuite/23_containers/vector/bool/allocator/move_assign.cc (test02):
	Adapt.
	* testsuite/21_strings/basic_string/allocator/char/move_assign.cc
	(test02): Adapt.
	* testsuite/21_strings/basic_string/allocator/wchar_t/move_assign.cc
	(test02): Adapt.

2019-05-16  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++17/fs_ops.cc (absolute(const path&, error_code&))
	[_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Remove bogus assertion.

	* include/std/variant (__overload_set): Remove.
	(_Arr): New helper.
	(_Build_FUN): New class template to define a single FUN overload,
	with specializations to prevent unwanted conversions, as per P0608R3.
	(_Build_FUNs): New class template to build an overload set of FUN.
	(_FUN_type): New alias template to perform overload resolution.
	(__accepted_type): Use integer_constant base for failure case. Use
	_FUN_type for successful case.
	(variant::__accepted_index): Use _Tp instead of _Tp&&.
	(variant::variant(_Tp&&)): Likewise.
	(variant::operator=(_Tp&&)): Likewise.

	* include/std/variant (_Variant_storage<false, _Types...>::_M_reset):
	Replace raw visitation with a runtime check for the valueless state
	and a non-raw visitor.
	(_Variant_storage<false, _Types...>::_M_reset_impl): Remove.
	(variant::index()): Remove branch.
	(variant::swap(variant&)): Use valueless_by_exception() instead of
	comparing the index to variant_npos, and add likelihood attribute.

	* include/bits/hashtable_policy.h (_Equal_helper): Remove.
	(_Hashtable_base::_Equal_hash_code): Define new class template.
	(_Hashtable_base::_M_equals): Use _Equal_hash_code instead of
	_Equal_helper.

	* include/bits/hashtable_policy.h (_Hashtable_ebo_helper::_S_get):
	Replace with _M_get non-static member function.
	(_Hashtable_ebo_helper::_S_cget): Replace with _M_cget non-static
	member function.
	(_Hash_code_base, _Local_iterator_base, _Hashtable_base):
	(_Hashtable_alloc): Adjust to use non-static members of EBO helper.

	* include/bits/hashtable_policy.h (_Hash_code_base::_M_swap): Use
	_S_get accessors for members in EBO helpers.
	(_Hash_code_base::_M_extract(), _Hash_code_base::_M_ranged_hash())
	(_Hash_code_base::_M_h1(), _Hash_code_base::_M_h2()): Remove non-const
	overloads.
	(_Hashtable_base::_M_swap): Use _S_get accessors for members in EBO
	helpers.
	(_Hashtable_base::_M_eq()): Remove non-const overload.

2019-05-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/variant (visit, visit<R>): Qualify calls to __do_visit.

2019-05-14  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/util/testsuite_allocator.h (NullablePointer::operator bool):
	Fix return value.

2019-05-14  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* config/os/solaris/solaris2.10: Move to ...
	* config/os/solaris: ... this.
	* configure.host (os_include_dir): Adapt.
	(abi_baseline_pair): Remove Solaris 10 handling.
	* config/abi/post/i386-solaris2.10: Remove.
	* config/abi/post/sparc-solaris2.10: Remove.
	* config/abi/post/i386-solaris2.11: Rename to ...
	* config/abi/post/i386-solaris: ... this.
	* config/abi/post/sparc-solaris2.11: Rename to ...
	* config/abi/post/sparc-solaris: ... this.

	* libsupc++/new_opa.cc [_GLIBCXX_HAVE_MEMALIGN] [__sun]: Remove
	workaround.

	* testsuite/ext/enc_filebuf/char/13598.cc: Remove *-*-solaris2.10
	xfail.

2019-05-14  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/variant (__visit_with_index): Remove typedef.
	(__deduce_visit_result): New tag type.
	(__raw_visit, __raw_idx_visit): New helper functions for "raw"
	visitation of possibly-valueless variants, forwarding to __do_visit
	with the relevant tag type.
	(_Variant_storage<false, _Types...>::_M_reset_impl): Use __raw_visit
	and make lambda return void.
	(__variant_construct): Likewise.
	(_Copy_assign_base::operator=, _Move_assign_base::operator=): Use
	__raw_idx_visit and make lambda return void.
	(_Multi_array::__untag_result): Add metafunction to check the function
	pointer type for a tag type that dictates the kind of visitation.
	(_Multi_array<_Ret(*)(_Visitor, _Variants...), __first, __rest...>):
	Use decltype(auto) instead of tagged function pointer type.
	(__gen_vtable_impl): Remove bool non-type parameter and unused
	_Variant_tuple parameter.
	(__gen_vtable_impl::__visit_invoke_impl): Remove.
	(__gen_vtable_impl::__do_visit_invoke): Remove.
	(__gen_vtable_impl::__do_visit_invoke_r): Remove.
	(__gen_vtable_impl::__visit_invoke): Use if-constexpr and __invoke_r
	for the visit<R> case, rather than dispatching to separate functions.
	(_VARIANT_RELATION_FUNCTION_TEMPLATE): Use __raw_idx_visit and make
	lambda return void.
	(variant::swap): Likewise.
	(__do_visit): Replace two non-type template parameters with a single
	type parameter, so that the caller must specify the visitor's return
	type (or one of the tag types).
	(visit): Deduce a return type from the visitor and use the
	__deduce_visit_result tag to enforce that all overloads return the
	same type.
	(visit<R>): Call __do_visit<R> with explicit result type.
	(__variant_hash_call_base_impl::operator()): Use __raw_visit and make
	lambda return void.

2019-05-14  Nina Dinka Ranns  <dinka.ranns@gmail.com>

	nonesuch is insufficiently useless (lwg2996)
	* include/std/type_traits (struct __nonesuch): Added private base
	class to make __nonesuch not an aggregate and removed deleted default
	constructor.
	* include/bits/stl_pair.h (struct __nonesuch_no_braces): Removed.
	(operator=(const pair&)): Use __nonesuch instead of
	__nonesuch_no_braces.
	(operator=(pair&&)): Likewise
	* include/std/tuple (operator=(const tuple&)): Use __nonesuch instead
	of __nonesuch_no_braces.
	(operator=(tuple&&)): Likewise
	* include/experimental/type_traits (struct nonesuch): Added private
	base class to make nonesuch not an aggregate and removed deleted
	default constructor.
	* testsuite/20_util/nonesuch/nonesuch.cc: New.
	* testsuite/experimental/type_traits/nonesuch.cc: New.

2019-05-14  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/std_function.h (_Simple_type_wrapper): Remove.
	(_Function_handler): Remove partial specializations for void return
	types and pointers to member.
	(_Function_handler::_M_manager): Adapt to removal of
	_Simple_type_wrapper.
	(_Function_handler::_M_invoke): Use __invoke_r instead of __invoke.
	* include/std/functional (_Bind_result::__enable_if_void)
	(_Bind_result::__disable_if_void): Remove sfinae helpers.
	(_Bind_result::__call): Use __invoke_r and remove overloads for void
	return types.
	* include/std/future (__future_base::_Task_state::_M_run)
	(__future_base::_Task_state::_M_run_delayed): Use __invoke_r and
	change return type of lambda expressions.

	* include/bits/invoke.h (__invoke_r): Define new function implementing
	the INVOKE<R> pseudo-function.
	* testsuite/20_util/function_objects/invoke/1.cc: Add more tests.
	* testsuite/20_util/function_objects/invoke/2.cc: New test.

	* include/std/type_traits (__is_nt_convertible_helper): Define it
	unconditionally, not only for C++20.
	(__is_nothrow_convertible): Define internal trait for use in C++11.
	(__is_nt_invocable_impl: Fix by using __is_nothrow_convertible.
	(is_invocable_r_v, is_nothrow_invocable_r_v): Add missing parameter.
	* testsuite/20_util/is_nothrow_convertible/value_ext.cc: New test.
	* testsuite/20_util/is_nothrow_convertible/value.cc: Check with type
	that has nothrow explicit conversion but potentially-throwing implicit
	conversion.
	* testsuite/20_util/is_nothrow_invocable/value.cc: Likewise.
	* testsuite/20_util/is_nothrow_invocable/value_ext.cc: Fix helper
	function to only consider implicit conversions.
	* testsuite/20_util/tuple/cons/noexcept_specs.cc: Add comment.

	* include/std/iterator: Include <iosfwd> instead of <istream> and
	<ostream>.

	* include/bits/stl_tree.h (_Rb_tree::erase(const Key*, const Key*)):
	Remove unused, non-standard function.

	* include/bits/regex.h (match_results::max_size()): Adjust return
	value to account for prefix/suffix/unmatched subs.
	(match_results::_M_resize(unsigned int)): Use _Base_type::assign to
	reset the contained sub matches.
	(match_results::_M_establish_failed_match(_Bi_iter)): Add new member
	function to set result state following a failed match.
	* include/bits/regex.tcc (__regex_algo_impl): Remove loop to set
	sub_match states after _M_resize. Use _M_establish_failed_match.

	PR libstdc++/69724
	* include/std/thread (thread::_State_impl, thread::_S_make_state):
	Replace single _Callable parameter with variadic _Args pack, to
	forward them directly to the tuple of decayed copies.
	* testsuite/30_threads/thread/cons/69724.cc: New test.

2019-05-14  Nina Dinka Ranns  <dinka.ranns@gmail.com>

	Inconsistency wrt Allocators in basic_string assignment (LWG2579)
	* include/bits/basic_string.h: (operator=(const basic_string&):
	Move allocator decision to assign.
	(assign(const basic_string&)): Move allocator decision here.
	* testsuite/21_strings/basic_string/allocator/char/copy_assign.cc:
	Add tests.
	* testsuite/21_strings/basic_string/allocator/wchar_t/copy_assign.cc:
	Add tests.

2019-05-14  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/util/testsuite_allocator.h (memory_resource)
	(default_resource_mgr): Fix indentation.

	* testsuite/20_util/allocator_traits/members/allocate_hint_nonpod.cc:
	Use operator-> to access raw pointer member.
	* testsuite/23_containers/vector/59829.cc: Likewise.
	* testsuite/23_containers/vector/bool/80893.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/cxx11.cc: Use NullablePointer.
	* testsuite/util/testsuite_allocator.h (NullablePointer): New utility
	for tests.
	(PointerBase, PointerBase_void): Derive from NullablePointer and use
	its constructors and equality operators. Change converting
	constructors to use operator-> to access private member of the other
	pointer type.
	(PointerBase_void::operator->()): Add, for access to private member.
	(operator-(PointerBase, PointerBase)): Change to hidden friend.
	(operator==(PointerBase, PointerBase)): Remove.
	(operator!=(PointerBase, PointerBase)): Remove.

	* python/libstdcxx/v6/printers.py (UniquePointerPrinter.__init__): Do
	not assume field called _M_head_impl is the first tuple element.
	* testsuite/libstdc++-prettyprinters/compat.cc: Make tuple
	implementation more accurate.
	* testsuite/libstdc++-prettyprinters/cxx11.cc: Check unique_ptr with
	empty pointer type and non-empty deleter.

	LWG 2899 - Make is_move_constructible correct for unique_ptr
	* include/bits/unique_ptr.h (__uniq_ptr_impl): Add move constructor,
	move assignment operator.
	(__uniq_ptr_impl::release(), __uniq_ptr_impl::reset(pointer)): Add.
	(__uniq_ptr_data): New class template with conditionally deleted
	special members.
	(unique_ptr, unique_ptr<T[], D>): Change type of data member from
	__uniq_ptr_impl<T, D> to __uniq_ptr_data<T, D>. Define move
	constructor and move assignment operator as defaulted.
	(unique_ptr::release(), unique_ptr<T[], D>::release()): Forward to
	__uniq_ptr_impl::release().
	(unique_ptr::reset(pointer), unique_ptr<T[], D>::reset<U>(U)): Forward
	to __uniq_ptr_impl::reset(pointer).
	* python/libstdcxx/v6/printers.py (UniquePointerPrinter.__init__):
	Check for new __uniq_ptr_data type.
	* testsuite/20_util/unique_ptr/dr2899.cc: New test.

2019-05-13  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/90454.cc path construction from void*
	* include/bits/fs_path.h (path::_Path): Use remove_pointer so that
	pointers to void are rejected as well as void.
	* include/experimental/bits/fs_path.h (path::_Path): Likewise.
	* testsuite/27_io/filesystem/path/construct/80762.cc: Also check
	pointers to void.
	* testsuite/experimental/filesystem/path/construct/80762.cc: Likewise.

	* doc/xml/manual/policy_data_structures.xml: Comment out stray
	<remark> elements. Fix formatting of bibliography references.

2019-05-13  Edward Smith-Rowland  <3dw4rd@verizon.net>

	* doc/xml/manual/status_cxx2020.xml: Document P0811R3 status.

2019-05-13  Jonathan Wakely  <jwakely@redhat.com>

	Remove Profile Mode, deprecated since 7.1.0
	* doc/Makefile.am: Remove XML file for profile mode docs.
	* doc/Makefile.in: Regenerate.
	* doc/xml/authors.xml: Remove authors of profile mode docs.
	* doc/xml/manual/appendix_contributing.xml: Remove mention of profile
	mode.
	* doc/xml/manual/debug.xml: Likewise.
	* doc/xml/manual/evolution.xml: Document removal of profile mode.
	* doc/xml/manual/profile_mode.xml: Remove profile mode docs.
	* doc/xml/manual/spine.xml: Remove profile mode author credit.
	* doc/xml/manual/test.xml: Remove docs for dg-require-profile-mode
	directive.
	* doc/xml/manual/using.xml: Remove docs for profile mode headers and
	macro.
	* doc/html/*: Regenerate.
	* include/Makefile.am: Remove profile mode headers.
	* include/Makefile.in: Regenerate.
	* include/bits/c++config (std::__profile): Remove namespace.
	[_GLIBCXX_PROFILE]: Remove checks for macro.
	* include/profile/array: Remove.
	* include/profile/base.h: Remove.
	* include/profile/bitset: Remove.
	* include/profile/deque: Remove.
	* include/profile/forward_list: Remove.
	* include/profile/impl/profiler.h: Remove.
	* include/profile/impl/profiler_algos.h: Remove.
	* include/profile/impl/profiler_container_size.h: Remove.
	* include/profile/impl/profiler_hash_func.h: Remove.
	* include/profile/impl/profiler_hashtable_size.h: Remove.
	* include/profile/impl/profiler_list_to_slist.h: Remove.
	* include/profile/impl/profiler_list_to_vector.h: Remove.
	* include/profile/impl/profiler_map_to_unordered_map.h: Remove.
	* include/profile/impl/profiler_node.h: Remove.
	* include/profile/impl/profiler_state.h: Remove.
	* include/profile/impl/profiler_trace.h: Remove.
	* include/profile/impl/profiler_vector_size.h: Remove.
	* include/profile/impl/profiler_vector_to_list.h: Remove.
	* include/profile/iterator_tracker.h: Remove.
	* include/profile/list: Remove.
	* include/profile/map: Remove.
	* include/profile/map.h: Remove.
	* include/profile/multimap.h: Remove.
	* include/profile/multiset.h: Remove.
	* include/profile/ordered_base.h: Remove.
	* include/profile/set: Remove.
	* include/profile/set.h: Remove.
	* include/profile/unordered_base.h: Remove.
	* include/profile/unordered_map: Remove.
	* include/profile/unordered_set: Remove.
	* include/profile/vector: Remove.
	* scripts/run_doxygen: Do not process profile mode headers.
	* testsuite/23_containers/array/element_access/60497.cc: Don't use
	profile mode type.
	* testsuite/23_containers/array/specialized_algorithms/swap_cxx17.cc:
	Remove dg-skip-if for profile mode.
	* testsuite/23_containers/forward_list/capacity/1.cc: Remove
	preprocessor check for profile mode.
	* testsuite/23_containers/list/capacity/29134.cc: Likewise.
	* testsuite/23_containers/map/modifiers/extract.cc: Remove dg-skip-if
	for profile mode.
	* testsuite/23_containers/map/modifiers/insert_or_assign/1.cc:
	Likewise.
	* testsuite/23_containers/map/modifiers/try_emplace/1.cc: Likewise.
	* testsuite/23_containers/multimap/modifiers/extract.cc: Likewise.
	* testsuite/23_containers/multiset/modifiers/extract.cc: Likewise.
	* testsuite/23_containers/set/modifiers/extract.cc: Likewise.
	* testsuite/23_containers/unordered_map/modifiers/extract.cc:
	Likewise.
	* testsuite/23_containers/unordered_multimap/modifiers/extract.cc:
	Likewise.
	* testsuite/23_containers/unordered_multiset/modifiers/extract.cc:
	Likewise.
	* testsuite/23_containers/unordered_set/modifiers/extract.cc:
	Likewise.
	* testsuite/23_containers/vector/bool/capacity/29134.cc: Remove
	preprocessor check for profile mode.
	* testsuite/23_containers/vector/bool/modifiers/insert/31370.cc:
	Likewise.
	* testsuite/23_containers/vector/modifiers/insert_vs_emplace.cc:
	Remove dg-skip-if for profile mode.
	* testsuite/25_algorithms/binary_search/partitioned.cc: Likewise.
	* testsuite/25_algorithms/equal_range/partitioned.cc: Likewise.
	* testsuite/25_algorithms/lexicographical_compare/71545.cc: Likewise.
	* testsuite/25_algorithms/lower_bound/partitioned.cc: Likewise.
	* testsuite/25_algorithms/upper_bound/partitioned.cc: Likewise.
	* testsuite/Makefile.am: Remove profile_flags variable and
	* testsuite/Makefile.am: Remove profile_flags variable and
	check-profile target.
	* testsuite/Makefile.in: Regenerate.
	* testsuite/ext/profile/all.cc: Remove.
	* testsuite/ext/profile/mutex_extensions_neg.cc: Remove.
	* testsuite/ext/profile/profiler_algos.cc: Remove.
	* testsuite/ext/profile/replace_new.cc: Remove.
	* testsuite/ext/throw_allocator/deallocate_global.cc: Remove
	preprocessor check for profile mode.
	* testsuite/ext/throw_allocator/deallocate_local.cc: Likewise.
	* testsuite/lib/libstdc++.exp (check_v3_target_profile_mode): Remove.
	(check_v3_target_normal_mode): Do not check for profile mode macro.
	* testsuite/libstdc++-prettyprinters/80276.cc: Remove dg-skip-if for
	profile mode.
	* testsuite/libstdc++-prettyprinters/compat.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/cxx11.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/cxx17.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/debug.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/debug_cxx11.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/libfundts.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/simple.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/simple11.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/whatis.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/whatis2.cc: Likewise.

	Remove array_allocator extension, deprecated since 4.9.0
	* doc/xml/manual/allocator.xml: Remove documentation for
	array_allocator.
	* doc/xml/manual/evolution.xml: Document array_allocator removal.
	* doc/xml/manual/using.xml: Remove header from documentation.
	* include/Makefile.am: Remove <ext/array_allocator.h> header.
	* include/Makefile.in: Regenerate.
	* include/ext/array_allocator.h: Remove.
	* include/precompiled/extc++.h: Do not include removed header.
	* testsuite/ext/array_allocator/1.cc: Remove.
	* testsuite/ext/array_allocator/2.cc: Remove.
	* testsuite/ext/array_allocator/26875.cc: Remove.
	* testsuite/ext/array_allocator/3.cc: Remove.
	* testsuite/ext/array_allocator/check_deallocate_null.cc: Remove.
	* testsuite/ext/array_allocator/check_delete.cc: Remove.
	* testsuite/ext/array_allocator/check_new.cc: Remove.
	* testsuite/ext/array_allocator/variadic_construct.cc: Remove.
	* testsuite/ext/headers.cc: Do not include removed header.

2019-05-11  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/stl_bvector.h
	(operator==(const _Bit_iterator_base&, const _Bit_iterator_base&)):
	Make hidden friend.
	(operator<(const _Bit_iterator_base&, const _Bit_iterator_base&)):
	Likewise.
	(operator!=(const _Bit_iterator_base&, const _Bit_iterator_base&)):
	Likewise.
	(operator>(const _Bit_iterator_base&, const _Bit_iterator_base&)):
	Likewise.
	(operator<=(const _Bit_iterator_base&, const _Bit_iterator_base&)):
	Likewise.
	(operator>=(const _Bit_iterator_base&, const _Bit_iterator_base&)):
	Likewise.
	(operator-(const _Bit_iterator_base&, const _Bit_iterator_base&)):
	Likewise.
	(_Bit_iterator::operator+(difference_type)): Likewise and allow NRVO
	copy elision.
	(_Bit_iterator::operator-(difference_type)): Likewise.
	(operator+(ptrdiff_t, const _Bit_iterator&)): Make hidden friend.
	(_Bit_const_iterator::operator+(difference_type)): Likewise and allow
	NRVO copy elision.
	(_Bit_const_iterator::operator-(difference_type)): Likewise.
	(operator+(ptrdiff_t, const _Bit_const_iterator&)): Make hidden friend.

2019-05-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/81266
	* testsuite/util/thread/all.h: Do not use remove_pointer for
	std::thread::native_handle_type.

	PR libstdc++/90397
	* include/std/variant (_Variant_storage<false, Types...>::_M_storage())
	(_Variant_storage<true, Types...>::_M_reset()))
	(_Variant_storage<true, Types...>::_M_storage())): Add noexcept.
	(__get_storage): Likewise.
	(variant): Add noexcept to friend declarations for __get and
	__get_storage.

	PR libstdc++/90388
	* include/bits/unique_ptr.h (default_delete, default_delete<T[]>):
	Use _Require for constraints.
	(operator>(nullptr_t, const unique_ptr<T,D>&)): Implement exactly as
	per the standard.
	(__uniq_ptr_hash): New base class with conditionally-disabled call
	operator.
	(hash<unique_ptr<T,D>>): Derive from __uniq_ptr_hash.
	* testsuite/20_util/default_delete/48631_neg.cc: Adjust dg-error line.
	* testsuite/20_util/unique_ptr/hash/90388.cc: New test.

	* include/bits/shared_ptr.h: Improve docs.
	* include/bits/shared_ptr_base.h: Likewise.
	* include/bits/stl_uninitialized.h: Likewise.
	* include/bits/unique_ptr.h: Likewise.
	* libsupc++/new: Likewise.

2019-05-09  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/stl_deque.h
	(operator==(const _Deque_iterator<>&, const _Deque_iterator<>&)):
	Make hidden friend.
	(operator!=(const _Deque_iterator<>&, const _Deque_iterator<>&)):
	Likewise.
	(operator<(const _Deque_iterator<>&, const _Deque_iterator<>&)):
	Likewise.
	(operator<=(const _Deque_iterator<>&, const _Deque_iterator<>&)):
	Likewise.
	(operator>(const _Deque_iterator<>&, const _Deque_iterator<>&)):
	Likewise.
	(operator>=(const _Deque_iterator<>&, const _Deque_iterator<>&)):
	Likewise.
	(_Deque_iterator<>::operator+(difference_type)): Likewise and allow NRVO
	copy elision.
	(_Deque_iterator<>::operator-(difference_type)): Likewise.

2019-05-08  François Dumont  <fdumont@gcc.gnu.org>

	PR libstdc++/90277
	* testsuite/23_containers/unordered_multiset/insert/24061-multiset.cc
	(test01): Reserve for number of insertions to avoid rehash during test.
	* testsuite/23_containers/unordered_multimap/insert/24061-multimap.cc
	(test01): Likewise.
	* testsuite/23_containers/unordered_multimap/insert/24061-multimap.cc
	(test01): Likewise.
	(test02): Likewise.
	(test03): Likewise.

2019-05-08  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/bits/fs_path.h: Improve docs.
	* include/experimental/bits/net.h: Fix wrong header name in comment.
	Do not document implementation details.
	* include/experimental/netfwd: Fix doxygen grouping.

2019-05-07  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_pair.h: Improve docs.
	* include/std/tuple: Likewise.

	* doc/doxygen/doxygroups.cc (std::literals): Add documentation for
	inline namespace.
	* include/std/chrono: Improve docs.
	* include/std/ratio: Do not document implementation details.
	* testsuite/20_util/ratio/cons/cons_overflow_neg.cc: Adjust dg-error
	line numbers.
	* testsuite/20_util/ratio/operations/ops_overflow_neg.cc: Likewise.

	PR libstdc++/89102
	* doc/xml/manual/intro.xml: Document DR 2408 and 2465 changes.
	* include/std/chrono (__duration_common_type_wrapper): Replace with ...
	(__duration_common_type): New helper.
	(common_type<chrono::duration<R1, P2>, chrono::duration<R2, P2>>): Use
	__duration_common_type.
	(__timepoint_common_type_wrapper): Replace with ...
	(__timepoint_common_type): New helper.
	(common_type<chrono::time_point<C, D2>, chrono::time_point<C, D2>>):
	Use __time_point_common_type.
	* include/std/type_traits (common_type<>): Define, as per LWG 2408.
	(__common_type_impl): If either argument is transformed by decay,
	use the common_type of the decayed types.
	(__common_type_impl<_Tp, _Up, _Tp, _Up>): If the types are already
	decayed, use __do_common_type_impl to get the common_type.
	(common_type<_Tp>): Use common_type<_Tp, _Tp>.
	(__do_member_type_wrapper, __member_type_wrapper)
	(__expanded_common_type_wrapper): Remove.
	(__common_type_pack, __common_type_fold): New helpers.
	(common_type<_Tp, _Up, _Vp...>): Use new helpers instead of
	__member_type_wrapper and __expanded_common_type_wrapper.
	* testsuite/20_util/common_type/requirements/explicit_instantiation.cc:
	Test zero-length template argument list.
	* testsuite/20_util/common_type/requirements/sfinae_friendly_1.cc:
	Test single argument cases and argument types that should decay.
	* testsuite/20_util/common_type/requirements/sfinae_friendly_2.cc:
	Adjust expected error.
	* testsuite/20_util/duration/literals/range_neg.cc: Use zero for
	dg-error lineno.
	* testsuite/20_util/duration/requirements/typedefs_neg1.cc: Likewise.
	* testsuite/20_util/duration/requirements/typedefs_neg2.cc: Likewise.
	* testsuite/20_util/duration/requirements/typedefs_neg3.cc: Likewise.

	* doc/xml/manual/intro.xml: Fix DR 2537 and DR 2566 confusion.

2019-05-01  Nina Dinka Ranns  <dinka.ranns@gmail.com>

	Make allocator propagation more consistent for
	operator+(basic_string) (P1165R1)
	* include/bits/basic_string.h
	(operator+(basic_string&&, basic_string&&): Changed resulting
	allocator to always be the one from the first parameter.
	* include/bits/basic_string.tcc
	(operator+(const _CharT*, const basic_string&)): Changed
	resulting allocator to be SOCCC on the second parameter's allocator.
	(operator+(_CharT, const basic_string&)): Likewise.
	* testsuite/21_strings/basic_string/allocator/char/operator_plus.cc:
	New.
	* testsuite/21_strings/basic_string/allocator/wchar_t/operator_plus.cc:
	New.

2019-05-07  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/regex.h: Improve docs.
	* include/bits/regex.tcc: Do not document implementation details.

	* testsuite/19_diagnostics/error_code/hash.cc: New test.

2019-05-06  François Dumont  <fdumont@gcc.gnu.org>

	* python/libstdcxx/v6/printers.py (add_one_template_type_printer):
	Add type printer for container types in std::__debug namespace.
	* testsuite/lib/gdb-test.exp (whatis-regexp-test): New.
	(gdb-tests): Use distinct parameters for the type of test and use of
	regex.
	(gdb-test): Check for regex test even if 'whatis' test.
	* testsuite/libstdc++-prettyprinters/80276.cc: Adapt for _GLIBCXX_DEBUG
	mode.
	* testsuite/libstdc++-prettyprinters/cxx11.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/cxx17.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/libfundts.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/simple.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/simple11.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/whatis.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/whatis2.cc: Likewise.

2019-05-04  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/system_error (error_category): Fix comment.

	PR libstdc++/90299
	* src/c++17/fs_ops.cc (absolute(const path&)): Report an error if the
	argument is an empty path.
	(absolute(const path&, error_code&)): Use invalid_argument as error
	code instead of no_such_file_or_directory.
	* testsuite/27_io/filesystem/operations/absolute.cc: Check handling
	of non-existent paths and empty paths with both overloads of absolute.

	* include/std/system_error (error_category, error_code)
	(error_condition): Improve docs.
	* libsupc++/exception: Add missing @addtogroup Doxygen command.
	* libsupc++/exception_ptr.h (exception_ptr): Link equality operators
	to class documentation. Suppress documentation for implementation
	details.
	* libsupc++/nested_exception.h (throw_with_nested, rethrow_if_nested):
	Suppress documentation for implementation details.

	* include/std/system_error (error_code): Remove friend declaration
	for hash<error_code>.
	(hash<error_code>::operator()): Use public member functions to access
	value and category.
	(hash<error_condition>::operator()): Use address of category, not
	its object representation.
	* src/c++11/compatibility-c++0x.cc (hash<error_code>::operator()):
	Use public member functions to access value and category.
	* testsuite/19_diagnostics/error_condition/hash.cc: New test.

2019-05-04  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/hashtable.h (_Hashtable<>::rehash): Review comment.
	* include/bits/hashtable_policy.h
	(_Prime_rehash_policy::_M_bkt_for_elements): Use __builtin_ceill.
	(_Power2_rehash_policy::_M_bkt_for_elements): Likewise.
	(_Power2_rehash_policy::_M_next_bkt): Enforce returning a result not
	smaller than input value rather than always greater. Preserve
	_M_next_resize if called with 0 input. Use __builtin_floorl.
	(_Power2_rehash_policy::_M_need_rehash): Rehash only if number of
	elements + number of insertions is greater than _M_next_resize. Start
	with 11 buckets if not told otherwise. Use __builtin_floorl.
	(_Rehash_base<>::reserve): Use rehash policy _M_bkt_for_elements.
	* src/c++11/hashtable_c++0x.cc (_Prime_rehash_policy::_M_next_bkt):
	Preserve _M_next_resize if called with 0 input. Use __builtin_floorl.
	(_Prime_rehash_policy::_M_need_rehash): Start with 11 buckets if not
	told otherwise. Use __builtin_floorl.
	* testsuite/23_containers/unordered_set/hash_policy/71181.cc: Adapt test
	to also validate _Power2_rehash_policy.
	* testsuite/23_containers/unordered_set/hash_policy/power2_rehash.cc:
	Adapt.

2019-05-03  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/61761
	* testsuite/26_numerics/complex/proj.cc: Don't assume <cmath> defines
	std::copysign.

	PR libstdc++/52119
	* include/ext/numeric_traits.h (__glibcxx_min): Avoid integer
	overflow warning with -Wpedantic -Wsystem-headers.

2019-05-02  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/90314
	* include/bits/c++config (_GLIBCXX_NOEXCEPT_IF): Use variadic macro.
	* include/bits/move.h (swap): Remove extra parentheses.

	* include/experimental/bits/lfts_config.h: Improve doc markup.
	* include/experimental/optional: Improve docs.
	(_Has_addressof_mem, _Has_addressof_free, _Has_addressof)
	(__constexpr_addressof): Remove.
	(optional::operator->()): Use std::__addressof().
	* include/std/optional (optional::operator->()): Adjust whitespace.
	* testsuite/experimental/optional/constexpr/observers/2.cc: Check
	that operator-> is still constexpr with overloaded operator&. Change
	to compile-only test.
	* testsuite/experimental/optional/constexpr/observers/3.cc: Change to
	compile-only test.

	* include/bits/shared_ptr.h: Improve docs.
	* include/bits/shared_ptr_atomic.h: Likewise.
	* include/bits/unique_ptr.h: Likewise. Adjust whitespace.

	* include/bits/basic_string.h: Fix iterator/index confusion in
	Doxygen comments.
	* include/bits/range_access.h: Fix Doxygen warnings.
	* include/bits/refwrap.h: Do not document implementation details.
	(ref, cref): Group docs with reference_wrapper.
	* include/std/fstream: Fix Doxygen markup.
	* libsupc++/initializer_list (begin, end): Group docs with
	initializer_list.

	* doc/doxygen/user.cfg.in: Set MARKDOWN_SUPPORT=YES.

	* include/bits/unique_lock.h: Fix/improve doxygen markup.
	* include/std/mutex: Likewise.
	* include/std/shared_mutex: Likewise.

	* include/bits/fs_dir.h: Fix/improve doxygen markup.
	* include/bits/fs_fwd.h: Likewise.
	* include/bits/fs_ops.h: Likewise.
	* include/bits/fs_path.h: Likewise.
	* include/std/filesystem: Likewise.

	* include/experimental/bits/net.h: Fix/improve doxygen markup.
	* include/experimental/buffer: Likewise.
	* include/experimental/executor: Likewise.
	* include/experimental/internet: Likewise.
	* include/experimental/io_context: Likewise.
	* include/experimental/net: Likewise.
	* include/experimental/netfwd: Likewise.
	* include/experimental/socket: Likewise.
	* include/experimental/timer: Likewise.

	* doc/doxygen/doxygroups.cc: Move description of experimental group
	here.
	* include/experimental/algorithm: Add to libfund-ts doc group.
	* include/experimental/any: Likewise. Do not document implementation
	details.
	* include/experimental/array: Add to libfund-ts doc group.
	* include/experimental/bits/lfts_config.h: Define libfund-ts doc group
	for Library Fundamentals.
	* include/experimental/chrono: Add to libfund-ts doc group.
	* include/experimental/deque: Likewise.
	* include/experimental/forward_list: Likewise.
	* include/experimental/functional: Likewise.
	* include/experimental/iterator: Likewise.
	* include/experimental/list: Likewise.
	* include/experimental/map: Likewise.
	* include/experimental/memory: Likewise.
	* include/experimental/memory_resource: Likewise. Improve docs.
	details.
	* include/experimental/numeric: Add to libfund-ts doc group.
	* include/experimental/optional: Likewise.
	* include/experimental/propagate_const: Likewise.
	* include/experimental/random: Likewise.
	* include/experimental/ratio: Likewise.
	* include/experimental/regex: Likewise.
	* include/experimental/set: Likewise.
	* include/experimental/source_location: Likewise.
	* include/experimental/string: Likewise.
	* include/experimental/string_view: Likewise.
	* include/experimental/system_error: Likewise.
	* include/experimental/tuple: Likewise.
	* include/experimental/type_traits: Likewise.
	* include/experimental/unordered_map: Likewise.
	* include/experimental/unordered_set: Likewise.
	* include/experimental/utility: Likewise.
	* include/experimental/vector: Likewise.
	* testsuite/experimental/any/misc/any_cast_neg.cc: Adjust dg-error.
	* testsuite/experimental/array/neg.cc: Adjust dg-error.
	* testsuite/experimental/propagate_const/assignment/move_neg.cc:
	Likewise.
	* testsuite/experimental/propagate_const/cons/move_neg.cc: Likewise.
	* testsuite/experimental/propagate_const/requirements2.cc: Likewise.
	* testsuite/experimental/propagate_const/requirements3.cc: Likewise.
	* testsuite/experimental/propagate_const/requirements4.cc: Likewise.
	* testsuite/experimental/propagate_const/requirements5.cc: Likewise.

	* include/experimental/bits/fs_dir.h: Fix Doxygen markup.
	* include/experimental/bits/fs_fwd.h: Improve docs.
	* include/experimental/bits/fs_ops.h: fix Doxygen markup.
	* include/experimental/bits/fs_path.h: Likewise.
	(path, filesystem_error, u8path): Improve docs.
	* include/experimental/filesystem: Link to docs for TS.

	* config/allocator/new_allocator_base.h (__allocator_base): Add
	workaround for Doxygen bug #6945.
	* include/std/memory: Improve docs. Define group for pointer safety.
	* include/std/scoped_allocator: Improve docs. Use "undocumented"
	conditional to suppress documentation for implementation details.

	* include/bits/specfun.h: Improve docs.
	* include/tr1/cmath: Likewise. Fix nesting of preprocessor conditions
	and namespaces.

	* doc/doxygen/doxygroups.cc (std::tr2, std::__gnu_cxx): Improve docs.
	(std::experimental): Add docs.
	* doc/doxygen/user.cfg.in (PREDEFINED): Expand macros for __cxx11
	namespace to nothing when generating docs.
	* include/bits/regex_constants.h (std::regex_constants): Improve docs.
	* include/std/chrono (std::chrono): Likewise.
	* include/std/functional (std::placeholders): Likewise.
	* include/std/thread (std::this_thread): Likewise.

	* include/parallel/settings.h: Fix Doxygen markup.

	* include/ext/pb_ds/detail/bin_search_tree_/*_imps.hpp: Do not define
	anything unless PB_DS_CLASS_C_DEC is defined.
	* include/ext/pb_ds/detail/binary_heap_/*_imps.hpp: Likewise.
	* include/ext/pb_ds/detail/binomial_heap_/*_imps.hpp: Likewise.
	* include/ext/pb_ds/detail/binomial_heap_base_/*_imps.hpp: Likewise.
	* include/ext/pb_ds/detail/cc_hash_table_map_/*_imps.hpp: Likewise.
	* include/ext/pb_ds/detail/gp_hash_table_map_/*_imps.hpp: Likewise.
	* include/ext/pb_ds/detail/hash_fn/*_imp.hpp: Likewise.
	* include/ext/pb_ds/detail/left_child_next_sibling_heap_/*_imps.hpp:
	Likewise.
	* include/ext/pb_ds/detail/list_update_map_/*_imps.hpp: Likewise.
	* include/ext/pb_ds/detail/ov_tree_map_/*_imps.hpp: Likewise.
	* include/ext/pb_ds/detail/pairing_heap_/*_imps.hpp: Likewise.
	* include/ext/pb_ds/detail/pat_trie_/*_imps.hpp: Likewise.
	* include/ext/pb_ds/detail/rb_tree_map_/*_imps.hpp: Likewise.
	* include/ext/pb_ds/detail/rc_binomial_heap_/*_imps.hpp: Likewise.
	* include/ext/pb_ds/detail/resize_policy*_imp.hpp: Likewise.
	* include/ext/pb_ds/detail/splay_tree_/*_imps.hpp: Likewise.
	* include/ext/pb_ds/detail/thin_heap_/*_imps.hpp: Likewise.
	* include/ext/pb_ds/detail/trie_policy*_imp.hpp: Likewise.
	* include/ext/pb_ds/detail/unordered_iterator/const_iterator.hpp:
	Likewise.
	* include/ext/pb_ds/detail/unordered_iterator/iterator.hpp: Likewise.
	* include/ext/pb_ds/detail/unordered_iterator/point_const_iterator.hpp:
	Likewise.
	* include/ext/pb_ds/detail/unordered_iterator/point_iterator.hpp:
	Likewise.

	* doc/doxygen/user.cfg.in: Regenerate with Doxygen 1.8.14 and set
	GROUP_NESTED_COMPOUNDS=YES and SORT_BY_SCOPE_NAME=NO. Add various
	_GLIBCXX_xxx macros and __attribute__(X) to PREDEFINED macros that
	Doxygen expands.

2019-05-01  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* config/abi/post/i386-solaris2.10/baseline_symbols.txt: Regenerate.
	* config/abi/post/i386-solaris2.10/amd64/baseline_symbols.txt: Likewise.
	* config/abi/post/i386-solaris2.11/baseline_symbols.txt: Likewise.
	* config/abi/post/i386-solaris2.11/amd64/baseline_symbols.txt: Likewise.
	* config/abi/post/sparc-solaris2.10/baseline_symbols.txt: Likewise.
	* config/abi/post/sparc-solaris2.10/sparcv9/baseline_symbols.txt:
	Likewise.
	* config/abi/post/sparc-solaris2.11/baseline_symbols.txt: Likewise.
	* config/abi/post/sparc-solaris2.11/sparcv9/baseline_symbols.txt:
	Likewise.

2019-05-01  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/61761
	* include/std/complex (__complex_proj): Return parameter unchanged.
	[_GLIBCXX_USE_C99_COMPLEX] (__complex_proj): Change overloads for
	floating-point types to take std::complex arguments.
	[_GLIBCXX_USE_C99_MATH_TR1] (__complex_proj): Add overloads for
	floating-point types.
	* testsuite/26_numerics/complex/proj.cc: New test.

2019-04-30  Jakub Jelinek  <jakub@redhat.com>

	* config/abi/pre/gnu.ver (GLIBCXX_3.4.26): Change _Lock_policyE2 exports
	to _Lock_policyE[012].
	* config/abi/post/riscv64-linux-gnu/baseline_symbols.txt: Update.

2019-04-30  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/filesystem/path/decompose/root_path.cc: Remove
	macros accidentally left in.
	* testsuite/27_io/filesystem/path/native/string-char8_t.cc: Remove
	unnecessary -lstdc++fs option. Fix test for mingw.
	* testsuite/experimental/filesystem/path/native/string-char8_t.cc:
	Fix test for mingw.

2019-04-30  Jakub Jelinek  <jakub@redhat.com>

	* config/abi/post/riscv64-linux-gnu/baseline_symbols.txt: Update.

2019-04-29  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_algo.h (generate_n): Adjust doxygen comment.

	* include/bits/move.h (swap(T&, T&), swap(T (&)[N], T (&)[N])): Use
	_GLIBCXX_NOEXCEPT_IF to simplify declarations.

	PR libstdc++/71312
	* src/c++11/shared_ptr.cc (get_mutex): Align pool mutexes to 64 bytes.

	* include/bits/stl_bvector.h (vector<bool>::empty()): Add nodiscard
	attribute.

	* include/bits/stl_iterator_base_types.h (_Iter_base): Remove unused
	class template and partial specialization.

	PR libstdc++/87982
	* include/bits/stl_algo.h (generate_n): Convert _Size parameter to
	an integral type.
	* include/bits/stl_algobase.h (__size_to_integer): New overloaded
	functions to convert a value to an integral type.
	(__fill_n_a, __fill_n_a): Assert that __n is already an integral type.
	(fill_n): Convert _Size parameter to an integral type.
	* testsuite/25_algorithms/fill_n/87982.cc: New test.
	* testsuite/25_algorithms/fill_n/87982_neg.cc: New test.
	* testsuite/25_algorithms/fill_n/dr426.cc: New test.
	* testsuite/25_algorithms/generate_n/87982.cc: New test.
	* testsuite/25_algorithms/generate_n/87982_neg.cc: New test.
	* testsuite/25_algorithms/generate_n/dr426.cc: New test.

2019-04-28  Nina Dinka Ranns  <dinka.ranns@gmail.com>

	Adding noexcept-specification on tuple constructors (LWG 2899)
	* libstdc++-v3/include/std/tuple:
	(tuple()): Add noexcept-specification.
	(tuple(const _Elements&...)): Likewise
	(tuple(_UElements&&...)): Likewise
	(tuple(const tuple<_UElements...>&)): Likewise
	(tuple(tuple<_UElements...>&&)): Likewise
	(tuple(const _T1&, const _T2&)): Likewise
	(tuple(_U1&&, _U2&&)): Likewise
	(tuple(const tuple<_U1, _U2>&): Likewise
	(tuple(tuple<_U1, _U2>&&): Likewise
	(tuple(const pair<_U1, _U2>&): Likewise
	(tuple(pair<_U1, _U2>&&): Likewise
	* libstdc++-v3/testsuite/20_util/tuple/cons/noexcept_specs.cc: New

2019-04-27  Marc Glisse  <marc.glisse@inria.fr>

	PR libstdc++/87106
	* include/bits/stl_uninitialized.h (__relocate_object_a): Mark the
	arguments with __restrict.

2019-04-26  H.J. Lu  <hongjiu.lu@intel.com>

	* config/abi/post/x86_64-linux-gnu/x32/baseline_symbols.txt: Updated.

2019-04-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/bits/fs_path.h
	(path::_S_convert_loc<_InputIterator>): Create const std::string to
	avoid redundant call to _S_convert_loc with non-const pointers.

	* testsuite/20_util/variant/run.cc: Use a new Hashable type to test
	hashing, because pmr::string depends on _GLIBCXX_USE_CXX11_ABI==1.
	* testsuite/21_strings/basic_string/hash/hash.cc
	[!_GLIBCXX_USE_CXX11_ABI]: Don't test pmr strings.
	* testsuite/21_strings/basic_string/hash/hash_char8_t.cc
	[!_GLIBCXX_USE_CXX11_ABI]: Likewise.

	* config/abi/pre/gnu.ver (GLIBCXX_3.4): Replace wildcard that matches
	wstring::_M_replace_dispatch with more specific patterns.
	* include/bits/fs_path.h (path::_S_convert_loc<_InputIterator>):
	Create const std::string to avoid redundant call to _S_convert_loc
	with non-const pointers.
	* include/bits/locale_conv.h (__do_str_codecvt): Use if-constexpr to
	avoid unnecessary basic_string::assign instantiations.

	* include/std/memory (__uses_alloc_args): Add string-literal to
	static_assert, to match the one in __uses_alloc.
	[__cpp_concepts] (_Std_pair): Use C++2a syntax for concept.
	* testsuite/20_util/polymorphic_allocator/construct_c++2a.cc: Check
	for recursive uses-allocator construction of nested pairs.
	* testsuite/20_util/scoped_allocator/construct_pair_c++2a.cc:: Add
	comment.

2019-04-26  Jakub Jelinek  <jakub@redhat.com>

	* config/abi/post/s390x-linux-gnu/32/baseline_symbols.txt: Update.
	* config/abi/post/s390-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/powerpc-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/powerpc64-linux-gnu/32/baseline_symbols.txt: Update.

	* config/abi/post/x86_64-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/x86_64-linux-gnu/32/baseline_symbols.txt: Update.
	* config/abi/post/i386-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/i486-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/aarch64-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/s390x-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/powerpc64-linux-gnu/baseline_symbols.txt: Update.

2019-04-25  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/90239
	* doc/xml/manual/status_cxx2020.xml: Amend P0591R4 status.
	* include/std/scoped_allocator [__cplusplus > 201703L]
	(scoped_allocator_adaptor::construct): Define in terms of
	uses_allocator_construction_args, as per P0591R4.
	* testsuite/20_util/scoped_allocator/construct_pair_c++2a.cc: New test.
	* testsuite/util/testsuite_allocator.h: Remove name of unused
	parameter.

2019-04-24  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2017.xml: Document P0024R2 status.
	* doc/html/*: Regenerate.

	* include/bits/fs_path.h (operator<, operator<=, operator>)
	(operator>=, operator==, operator!=): Make hidden friends, as per
	LWG 3065.
	* testsuite/27_io/filesystem/path/native/string-char8_t.cc: Fix
	string type in test.
	* testsuite/27_io/filesystem/path/native/string.cc: Likewise.

	* include/std/any (any::any(ValueType&&)): Use __and_v.
	* include/std/numeric (midpoint(T, T, T), midpoint(T*, T*, T*)):
	Likewise.

	* include/std/tuple (apply): Use remove_reference_t instead of decay_t
	as per P0777R1.
	* include/std/type_traits (__result_of_memfun): Use remove_reference
	instead of __remove_cvref_t and remove redundant is_same check.
	(__inv_unwrap): Use __remove_cvref_t instead of decay_t.

	* include/experimental/string_view (basic_string_view::pointer)
	(basic_string_view::reference): Fix to refer to non-const value_type.
	* include/bits/basic_string.h (basic_string): Use __sv_check and
	__sv_limit instead of basic_string_view::_M_check and
	basic_string_view::_M_limit.
	* include/std/string_view (__sv_check, __sv_limit): New
	helper functions to replace basic_string_view::_M_check and
	basic_string_view::_M_limit.
	(basic_string_view): Add static assertions to enforce ill-formed
	requirement for traits_type::char_type from P1148R0, and to enforce
	required properties of char-like types.
	(basic_string_view::pointer, basic_string_view::reference): Fix to
	refer to non-const value_type.
	(basic_string_view::operator[], basic_string_view::at)
	(basic_string_view::front, basic_string_view::back)
	(basic_string_view::data): Use const_reference and const_pointer
	typedefs for return types.
	(basic_string_view::_M_check, basic_string_view::_M_limit): Remove.
	(hash<wstring_view>): Fix argument_type typedef.
	* testsuite/21_strings/basic_string_view/modifiers/remove_prefix/
	char/1.cc: Fix expected return type of basic_string_view::data().
	* testsuite/21_strings/basic_string_view/modifiers/remove_prefix/
	wchar_t/1.cc: Likewise.
	* testsuite/21_strings/basic_string_view/modifiers/remove_suffix/
	char/1.cc: Likewise.
	* testsuite/21_strings/basic_string_view/modifiers/remove_suffix/
	wchar_t/1.cc: Likewise.
	* testsuite/21_strings/basic_string_view/requirements/traits_neg.cc:
	New test.
	* testsuite/21_strings/basic_string_view/requirements/typedefs.cc:
	Check reference and pointer typedefs.
	* testsuite/experimental/string_view/requirements/typedefs.cc:
	Likewise.
	* testsuite/experimental/string_view/modifiers/remove_prefix/char/1.cc:
	Fix expected return type of basic_string_view::data().
	* testsuite/experimental/string_view/modifiers/remove_prefix/wchar_t/
	1.cc: Likewise.
	* testsuite/experimental/string_view/modifiers/remove_suffix/char/1.cc:
	Likewise.
	* testsuite/experimental/string_view/modifiers/remove_suffix/wchar_t/
	1.cc: Likewise.

	PR libstdc++/90220
	* include/std/any (__any_caster): Use remove_cv_t instead of decay_t.
	Avoid a runtime check for types that can never be stored in std::any.
	* testsuite/20_util/any/misc/any_cast.cc: Test std::any_cast with
	array types.

	PR libstdc++/90220 (partial)
	* include/std/any (any_cast<T>(any*), any_cast<T>(const any*)): Do
	not attempt ill-formed static_cast to pointers to non-object types.
	* testsuite/20_util/any/misc/any_cast.cc: Test std::any_cast with
	function types.

	* testsuite/20_util/variant/run.cc: Catch exception by reference to
	prevent -Wcatch-value warning.

	* include/std/variant (__variant_construct): Use template parameter
	type instead of equivalent decltype-specifier.
	(_Move_ctor_base<false, Types...>::_Move_ctor_base(_Move_ctor_base&&)):
	Replace forward with move.
	(_Move_ctor_base<false, Types...>::_M_destructive_move)
	(_Move_ctor_base<false, Types...>::_M_destructive_copy)
	(_Move_ctor_base<true, Types...>::_M_destructive_move)
	(_Move_ctor_base<true, Types...>::_M_destructive_copy): Only set the
	index after construction succeeds.
	(_Copy_assign_base<false, Types...>::operator=): Remove redundant
	if-constexpr checks that are always true. Use __remove_cvref_t instead
	of remove_reference so that is_nothrow_move_constructible check
	doesn't use a const rvalue parameter. In the potentially-throwing case
	construct a temporary and move assign it, as per LWG 2904.
	(_Move_assign_base<false, Types...>::operator=): Remove redundant
	if-constexpr checks that are always true. Use emplace as per LWG 2904.
	(variant::operator=(T&&)): Only use emplace conditionally, otherwise
	construct a temporary and move assign from it, as per LWG 2904.
	* testsuite/20_util/variant/exception_safety.cc: Check that
	assignment operators have strong exception safety guarantee.

2019-04-23  Thomas Rodgers <trodgers@redhat.com>

	Document PSTL linker flags

	* doc/xml/manual/using.xml: Add PSTL linker flags to table 3.1.

2019-04-23  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/variant (__detail::__variant::_Traits): Make
	_S_trivial_copy_assign depend on _S_trivial_copy_ctor and make
	_S_trivial_move_assign depend on _S_trivial_move_ctor, as per
	P0602R4.
	(__detail::__variant::_Copy_assign_alias): Only depend on
	_S_trivial_copy_assign, which subsumes _S_trivial_copy_ctor now.
	* testsuite/20_util/variant/compile.cc: Correct checks for trivial
	move assignment operators.

	PR libstdc++/90165
	* include/std/variant (variant::__not_self): New helper for the
	is_same_v<remove_cvref_t<T>, variant>==false constraints.
	(variant::__to_type_impl): Remove.
	(variant::__to_type): Add default argument to check pack size, instead
	of using __to_type_impl.
	(variant::__accepted_type): Add default argument using __not_self.
	(variant::__is_in_place_tag, variant::__not_in_place_tag): New helpers
	for variant(T&&) constructor constraint.
	(variant::variant(T&&)): Use __not_in_place_tag in constraints.
	Extract __accepted_type into a named template parameter for reuse in
	other constraints and in the exception specification.
	(variant::variant(in_place_type_t<T>, Args&&...))
	(variant::variant(in_place_type_t<T>, initializer_list<U>, Args&&...))
	(variant::variant(in_place_index_t<T>, Args&&...))
	(variant::variant(in_place_index_t<T>, initializer_list<U>, Args&&...))
	(variant::operator=T&&)): Remove redundant && from trait arguments.
	* testsuite/20_util/variant/compile.cc: Check variant(T&&) constructor
	isn't used for in_place_type or in_place_index arguments.

	* include/std/type_traits (unwrap_reference_t): Define for C++2a.
	(unwrap_ref_decay): Remove inheritance from unwrap_reference.
	* testsuite/20_util/unwrap_reference/1.cc: Adjust test to use alias.

2019-04-23  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>
	    Bernd Edlinger  <bernd.edlinger@hotmail.de>
	    Jakub Jelinek  <jakub@redhat.com>

	PR target/89093
	* libsupc++/eh_personality.cc (PERSONALITY_FUNCTION): Add
	general-regs-only target attribute for ARM.

2019-04-23  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/87431
	* include/bits/basic_string.h (_Never_valueless_alt): Make partial
	specialization also depend on is_nothrow_move_constructible.
	* include/std/variant (__detail::__variant::__never_valueless()):
	Only true if the variant would have a move assignment operator.
	(__detail::__variant::_Variant_storage<false, T...>::_M_valid()):
	Check __never_valueless<T...>().
	(variant::emplace): Only perform non-throwing move assignments
	for never-valueless alternatives if the variant has a move assignment
	operator.
	* testsuite/20_util/variant/compile.cc: Check that never-valueless
	types can be emplaced into non-assignable variants.
	* testsuite/20_util/variant/run.cc: Check that never-valueless types
	don't get copied when emplaced into non-assignable variants.

	* include/std/variant (__detail::__variant::__ref_cast): Remove
	unused function.
	(__detail::__variant::_Uninitialized::_M_get)
	(__detail::__variant::__get)
	(__gen_vtable_impl::__element_by_index_or_cookie): Add noexcept.

2019-04-21  Iain Sandoe  <iain@sandoe.co.uk>

	* testsuite/17_intro/headers/c++1998/charset.cc: Skip for Darwin8
	to Darwin10.
	* testsuite/17_intro/headers/c++2011/charset.cc: Likewise.
	* testsuite/17_intro/headers/c++2014/charset.cc: Likewise.
	* testsuite/17_intro/headers/c++2017/charset.cc: Likewise.
	* testsuite/17_intro/headers/c++2020/charset.cc: Likewise.

2019-04-20  Thomas Rodgers <trodgers@redhat.com>

	Delegate PSTL configuration to pstl/pstl_config.h

	* include/bits/c++config: Remove explicit PSTL configuration
	macros and use definitions from <pstl/pstl_config.h>.

2019-04-20  Thomas Rodgers <trodgers@redhat.com>

	Cleanup algorithm implementations
	* include/pstl/glue_algorithm_impl.h (stable_sort): Forward
	execution policy.
	(mismatch): Forward execution policy.
	(equal): Qualify call to std::equal().
	(partial_sort): Forward execution policy.
	(inplace_merge): Forward execution policy.

2019-04-19  Thomas Rodgers <trodgers@redhat.com>

	Improve implementation of parallel equal()
	* include/pstl/algorithm_impl.h
	(__internal::__brick_equal): use "4 iterator" version of
	std::equal().
	(__internal::__brick_equal): use simd for random access
	iterators on unsequenced execution policies.
	(__internal::__pattern_equal): add "4 iterator" version
	(__internal::__pattern_equal): dispatch to simd __brick_equal
	for vector-only execution policies.
	(__internal::__pattern_equal): dispatch to __parallel_or for
	parallel execution policies.
	* include/pstl/glue_algorithm_impl.h
	(std::equal): dispatch to "4 iterator" version of
	__internal::__pattern_equal().

2019-04-17  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/90105
	* include/bits/forward_list.h (operator==): Do not use operator!= to
	compare elements.
	(forward_list<T, A>::sort(Comp)): When elements are equal take the one
	earlier in the list, so that sort is stable.
	* testsuite/23_containers/forward_list/operations/90105.cc: New test.
	* testsuite/23_containers/forward_list/comparable.cc: Test with
	types that meet the minimum EqualityComparable and LessThanComparable
	requirements. Remove irrelevant comment.

	* include/std/variant (__detail::__variant::_Traits::_S_copy_assign):
	Do not depend on whether all alternative types are move constructible.
	(__detail::__variant::_Copy_assign_base::operator=): Remove cv-quals
	from the operand when deciding whether to perform the assignment.
	* testsuite/20_util/variant/compile.cc (DeletedMoves): Define type
	with deleted move constructor and deleted move assignment operator.
	(default_ctor, copy_ctor, move_ctor, copy_assign, move_assign): Check
	behaviour of variants with DeletedMoves as an alternative.
	* testsuite/20_util/variant/run.cc (DeletedMoves): Define same type.
	(move_ctor, move_assign): Check that moving a variant with a
	DeletedMoves alternative falls back to copying instead of moving.

	* testsuite/20_util/variant/compile.cc: Remove empty string literals
	from static_assert declarations.

	* testsuite/20_util/variant/compile.cc (MoveCtorOnly): Fix type to
	actually match its name.
	(MoveCtorAndSwapOnly): Define new type that adds swap to MoveCtorOnly.
	(test_swap()): Fix result for MoveCtorOnly and check
	MoveCtorAndSwapOnly.

	* include/std/optional (optional::value_or(U&&) &&): Add missing
	constexpr specifier.
	* testsuite/20_util/optional/constexpr/observers/4.cc: Check value_or
	for disengaged optionals and rvalue optionals.
	* testsuite/20_util/optional/observers/4.cc: Likewise.

2019-04-12  Thomas Rodgers  <trodgers@redhat.com>

	* include/pstl/algorithm_impl.h: Uglify identfiers.
	* include/pstl/numeric_impl.h:  Uglify identfiers.
	* include/pstl/parallel_backend_tbb.h: Uglify identfiers.

2019-04-11  Thomas Rodgers  <trodgers@redhat.com>

	* include/bits/c++config:
	Add definition for __PSTL_ASSERT.
	Add definition for __PSTL_ASSERT_MSG.
	* include/pstl/algorithm_impl.h: Replace use of assert().
	* include/pstl/numeric_impl.h: Replace use of assert().
	* include/pstl/parallel_backend_tbb.h:
	Replace use of assert().
	Replace use of __TBB_ASSERT().
	* include/pstl/parallel_backend_utils.h: Replace use of assert().

2019-04-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/90046
	* src/c++17/memory_resource.cc
	(monotonic_buffer_resource::_Chunk::allocate): Increase alignment if
	needed to allow placing a _Chunk at the end of the buffer.
	(monotonic_buffer_resource::_M_new_buffer): Remove static_assert.

2019-04-10  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/faq.xml: Add information about emergency EH pool.
	* doc/xml/manual/debug.xml: Update list of memory debugging tools.
	Move outdated information on mt_allocator to a separate section.
	* doc/xml/manual/evolution.xml: Clarify that GLIBCXX_FORCE_NEW
	doesn't affect the default allocator.

	* testsuite/lib/libstdc++.exp (check_v3_target_parallel_mode): Fix
	typo.

	PR libstdc++/89851
	* testsuite/20_util/variant/89851.cc: New test.

2019-04-09  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/variant: Adjust whitespace. Add comments.
	(_Multi_array): Leave primary template undefined.
	(_Multi_array<_Tp>): Define partial specialization for base case of
	recursion.
	(__gen_vtable_impl, __gen_vtable): Remove redundant && from type
	which is always a reference.
	(__gen_vtable::_S_apply()): Remove function, inline body into
	default member initializer.
	* testsuite/20_util/variant/visit.cc: Test with noncopyable types.

	* include/std/variant (__variant_idx_cookie): Add member type.
	(__visitor_result_type): Remove.
	(__do_visit): Use invoke_result instead of __visitor_result_type.
	* testsuite/20_util/variant/visit.cc: New test.

	PR libstdc++/90008
	* include/std/variant (_VARIANT_RELATION_FUNCTION_TEMPLATE): Remove
	unused capture.
	* testsuite/20_util/variant/90008.cc: New test.

2019-04-09  Thomas Rodgers  <trodgers@redhat.com>

	* include/pstl/algorithm_impl.h: Add namespace qualification.
	* include/pstl/execution_defs.h: Add namespace qualification.
	* include/pstl/execution_impl.h: Add namespace qualification.
	* include/pstl/numeric_impl.h: Add namespace qualification.
	* include/pstl/parallel_backend_tbb.h: Add namespace qualification.
	* include/pstl/unseq_backend_simd.h: Add namespace qualification.
	* include/pstl/parallel_backend_utils.h: Include <cassert>.

2019-04-08  Ville Voutilainen  <ville.voutilainen@gmail.com>

	Fix visit<R> for variant.
	* include/std/variant (__do_visit): Add a template parameter
	for enforcing same return types for visit.
	(__gen_vtable_impl): Likewise.
	(_S_apply_single_alt): Adjust.
	(__visit_invoke_impl): New. Handle casting to void.
	(__do_visit_invoke): New. Enforces same return types.
	(__do_visit_invoke_r): New. Converts return types.
	(__visit_invoke): Adjust.
	(__gen_vtable):  Add a template parameter for enforcing
	same return types for visit.
	* testsuite/20_util/variant/visit_r.cc: Add a test for a visitor with
	different return types.
	* testsuite/20_util/variant/visit_neg.cc: New. Ensures that
	visitors with different return types don't accidentally
	compile with regular visitation.

2019-04-08  Christophe Lyon  <christophe.lyon@linaro.org>

	* testsuite/27_io/filesystem/iterators/caching.cc: Add
	dg-require-filesystem-ts.

2019-04-05  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2020.xml: Update status.
	* include/std/variant (visit<R>): Define for C++2a (P0655R1).
	* testsuite/20_util/variant/visit_r.cc: New test.

	* include/bits/fs_dir.h (directory_iterator::operator*)
	(directory_iterator::operator->): Add noexcept.
	(operator==, operator!=): Replace namespace-scope equality operators
	for directory iterators with hidden friends.

	PR libstdc++/89986
	* config/abi/pre/gnu.ver: Add missing exports.
	* testsuite/27_io/filesystem/iterators/directory_iterator.cc: Test
	increment member.

	* config/abi/pre/gnu.ver: Export new symbols.
	* include/bits/fs_dir.h (recursive_directory_iterator::options())
	(recursive_directory_iterator::recursion_pending())
	(recursive_directory_iterator::disable_recursion_pending()): Remove
	inline definitions. Make noexcept.
	(recursive_directory_iterator::depth())
	(recursive_directory_iterator::operator*())
	(recursive_directory_iterator::operator->()): Make noexcept.
	(recursive_directory_iterator::_M_options)
	(recursive_directory_iterator::_M_pending): Remove data members.
	* src/c++17/fs_path.cc (_Dir_stack): Add constructor and data members.
	(recursive_directory_iterator::recursive_directory_iterator): Remove
	ctor-initializer. Use new constructor for _Dir_stack.
	(recursive_directory_iterator::options())
	(recursive_directory_iterator::recursion_pending())
	(recursive_directory_iterator::disable_recursion_pending()): Add
	non-inline definitions.
	(recursive_directory_iterator::depth()): Make noexcept.
	(recursive_directory_iterator::increment(error_code&))
	(recursive_directory_iterator::pop(error_code&)): Adjust to new
	location of options and recursion_pending members.
	* testsuite/27_io/filesystem/iterators/recursion_pending.cc: New test.
	* testsuite/util/testsuite_fs.h (__gnu_test::scoped_file): Add
	user-declared move constructor and assignment operator, to make the
	type move-only.

	* src/c++17/fs_dir.cc (_Dir::advance(bool, error_code&)): Handle
	d_type == DT_UNKNOWN immediately.
	(_Dir::should_recurse(bool, error_code&)): Remove file_type::unknown
	handling here.
	* testsuite/27_io/filesystem/iterators/caching.cc: New test.

	* include/bits/fs_path.h (path::operator=(path&&)): Check for self
	assignment.
	* src/c++17/fs_path.cc (path::operator=(const path&)): Likewise.
	* testsuite/27_io/filesystem/path/assign/copy.cc: Test self
	assignment.

	PR libstdc++/87431 (again)
	* include/bits/basic_string.h (__variant::_Never_valueless_alt):
	Define partial specialization for basic_string.
	* include/bits/shared_ptr.h (_Never_valueless_alt): Likewise for
	shared_ptr and weak_ptr.
	* include/bits/std_function.h (_Never_valueless_alt): Likewise for
	function.
	* include/bits/stl_vector.h (_Never_valueless_alt): Likewise for
	vector.
	* include/bits/unique_ptr.h (_Never_valueless_alt): Likewise for
	unique_ptr.
	* include/debug/vector (_Never_valueless_alt): Likewise for debug
	vector.
	* include/std/any (_Never_valueless_alt): Define explicit
	specialization for any.
	* include/std/variant (_Never_valueless_alt): Define primary template.
	(__never_valueless): Use _Never_valueless_alt instead of
	is_trivially_copyable.
	(variant::emplace<N>(Args&&...)): Add special case for non-throwing
	initializations to avoid try-catch overhead. Add special case for
	scalars produced by potentially-throwing conversions. Use
	_Never_valueless_alt instead of is_trivially_copyable for the
	remaining strong exception-safety cases.
	(variant::emplace<N>(initializer_list<U>, Args&&...)): Likewise.
	* testsuite/20_util/variant/87431.cc: Run both test functions.
	* testsuite/20_util/variant/exception_safety.cc: New test.
	* testsuite/20_util/variant/run.cc: Use pmr::string instead of string,
	so the variant becomes valueless.

2019-04-03  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/85184
	* include/std/variant (_Copy_assign_base, _Move_assign_base, variant):
	Remove assertions.
	(variant::emplace<_Tp>): Return result of emplace<N> directly.

	* include/std/string (__hash_string_base): New class template defining
	operator() for hashing strings.
	(hash<pmr::string>, hash<pmr::u8string>, hash<pmr::u16string>)
	(hash<pmr::u32string>, hash<pmr::wstring>): Define for C++17.
	* testsuite/21_strings/basic_string/hash/hash.cc: New test.
	* testsuite/21_strings/basic_string/hash/hash_char8_t.cc: New test.

2019-04-01  Ville Voutilainen  <ville.voutilainen@gmail.com>

	Use single-visitation in variant assignment and swap and relops.
	Also use indices instead of types when checking whether
	variants hold the same thing.
	* include/std/variant (__do_visit): Add a template parameter
	for index visitation, invoke with indices if index visitation
	is used.
	(__variant_idx_cookie): New.
	(__visit_with_index): Likewise.
	(_Copy_assign_base::operator=): Do single-visitation with
	an index visitor.
	(_Move_assign_base::operator=): Likewise.
	(_Extra_visit_slot_needed): Adjust.
	(__visit_invoke): Call with indices if it's an index visitor.
	(relops): Do single-visitation with an index visitor.
	(swap): Likewise.
	(__visitor_result_type): New.

2019-03-30  Eric Botcazou  <ebotcazou@adacore.com>

	* src/c++17/fs_ops.cc (fs::permissions): Use std::errc::not_supported.

2019-03-28  Ville Voutilainen  <ville.voutilainen@gmail.com>

	Don't revisit a variant we are already visiting.
	* include/std/variant (__variant_construct_single): New.
	(__variant_construct): Use it.
	(_M_destructive_move): Likewise.
	(_M_destructive_copy): Likewise.
	(_Copy_assign_base::operator=): Adjust.
	(_Move_assign_base::operator=): Likewise.
	(swap): Likewise.

2019-03-26  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/85965
	* include/bits/hashtable.h (_Hashtable): Move static assertions to
	destructor so they are not evaluated until the _Key type is complete.
	* include/bits/stl_tree.h (_Rb_tree): Likewise.
	* testsuite/23_containers/set/85965.cc: New test.
	* testsuite/23_containers/unordered_set/85965.cc: New test.
	* testsuite/23_containers/map/48101_neg.cc: Replace "here" errors
	with regexp matching the corresponding _Rb_tree specialization.
	* testsuite/23_containers/multimap/48101_neg.cc: Likewise.
	* testsuite/23_containers/multiset/48101_neg.cc: Remove "here" error.
	* testsuite/23_containers/set/48101_neg.cc: Likewise.
	* testsuite/23_containers/unordered_map/48101_neg.cc: Likewise.
	* testsuite/23_containers/unordered_multimap/48101_neg.cc: Likewise.
	* testsuite/23_containers/unordered_multiset/48101_neg.cc: Likewise.
	* testsuite/23_containers/unordered_set/48101_neg.cc: Likewise.

2019-03-26  Ville Voutilainen  <ville.voutilainen@gmail.com>

	PR libstdc++/89825
	Fix based on a suggestion by Antony Polukhin.
	* include/std/variant (__never_valueless): New.
	(_M_valid): Use it.
	(_Extra_visit_slot_needed): New.
	(_Multi_array): Use it.
	(_S_apply_all_alts): Likewise.

2019-03-26  Ville Voutilainen  <ville.voutilainen@gmail.com>

	PR libstdc++/89824
	Fix based on a suggestion by Antony Polukhin.
	* include/std/variant (__gen_vtable): Don't reserve an
	additional table slot, _Multi_array already does that.

2019-03-26  Ville Voutilainen  <ville.voutilainen@gmail.com>

	PR libstdc++/89816
	Fix based on a suggestion by Antony Polukhin.
	* include/std/variant (__variant_construct): Capture a pointer
	to the storage and visit just one variant.

2019-03-22  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/backwards_compatibility.xml: Remove link to
	Doxygen-generated pages with unstable URL.
	* doc/xml/manual/concurrency_extensions.xml: Likewise.
	* doc/xml/manual/extensions.xml: Likewise.
	* doc/xml/manual/parallel_mode.xml: Likewise.
	* doc/xml/manual/support.xml: Likewise.

	* include/bits/stl_algobase.h (__lg): Do arithmetic on type int to
	avoid -Wconversion warnings.

2019-03-21  Thomas Rodgers  <trodgers@redhat.com>

	* include/Makefile.am (std_header): Add ${std_srcdir}/execution.
	(pstl_srcdir, pstl_builddir, pstl_headers): New variables.
	(allstamped): Add stamp-pstl.
	(install-headers): Add ptsl_builddir.
	* include/Makefile.in: Regenerate.
	* include/bits/c++config: Add pstl configuration.
	* include/pstl/LICENSE.txt: New file.
	* include/pstl/algorithm_fwd.h: New file.
	* include/pstl/algorithm_impl.h: New file.
	* include/pstl/execution_defs.h: New file.
	* include/pstl/execution_impl.h: New file.
	* include/pstl/glue_algorithm_defs.h: New file.
	* include/pstl/glue_algorithm_impl.h: New file.
	* include/pstl/glue_execution_defs.h: New file.
	* include/pstl/glue_memory_defs.h: New file.
	* include/pstl/glue_memory_impl.h: New file.
	* include/pstl/glue_numeric_defs.h: New file.
	* include/pstl/glue_numeric_impl.h: New file.
	* include/pstl/memory_impl.h: New file.
	* include/pstl/numeric_fwd.h: New file.
	* include/pstl/numeric_impl.h: New file.
	* include/pstl/parallel_backend.h: New file.
	* include/pstl/parallel_backend_tbb.h: New file.
	* include/pstl/parallel_backend_utils.h: New file.
	* include/pstl/parallel_impl.h: New file.
	* include/pstl/pstl_config.h: New file.
	* include/pstl/unseq_backend_simd.h: New file.
	* include/pstl/utils.h: New file.
	* include/std/algorithm: Include parallel algorithm implementations.
	* include/std/execution: New file.
	* include/std/memory: Include parallel algorithm implementations.
	* include/std/numeric: Include parallel algorithm implementations.
	* include/std/version: Add parallel algorithms feature test macro.
	* testsuite/util/pstl/pstl_test_config.h: New file.
	* testsuite/util/pstl/test_utils.h: New file.
	* testsuite/20_util/specialized_algorithms/pstl/uninitialized_construct.cc: New file.
	* testsuite/20_util/specialized_algorithms/pstl/uninitialized_copy_move.cc: New file.
	* testsuite/20_util/specialized_algorithms/pstl/uninitialized_fill_destroy.cc: New file.
	* testsuite/25_algorithms/pstl/alg_merge/inplace_merge.cc: New file.
	* testsuite/25_algorithms/pstl/alg_merge/merge.cc: New file.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/copy_if.cc: New file.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/copy_move.cc: New file.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/fill.cc: New file.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/generate.cc: New file.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/is_partitioned.cc: New file.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/partition.cc: New file.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/partition_copy.cc: New file.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/remove.cc: New file.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/remove_copy.cc: New file.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/replace.cc: New file.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/replace_copy.cc: New file.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/rotate.cc: New file.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/rotate_copy.cc: New file.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/swap_ranges.cc: New file.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/transform_binary.cc: New file.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/transform_unary.cc: New file.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/unique.cc: New file.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/unique_copy_equal.cc: New file.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/adjacent_find.cc: New file.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/all_of.cc: New file.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/any_of.cc: New file.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/count.cc: New file.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/equal.cc: New file.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/find.cc: New file.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/find_end.cc: New file.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/find_first_of.cc: New file.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/find_if.cc: New file.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/for_each.cc: New file.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/mismatch.cc: New file.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/none_of.cc: New file.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/nth_element.cc: New file.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/reverse.cc: New file.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/reverse_copy.cc: New file.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/search_n.cc: New file.
	* testsuite/25_algorithms/pstl/alg_sorting/includes.cc: New file.
	* testsuite/25_algorithms/pstl/alg_sorting/is_heap.cc: New file.
	* testsuite/25_algorithms/pstl/alg_sorting/is_sorted.cc: New file.
	* testsuite/25_algorithms/pstl/alg_sorting/lexicographical_compare.cc: New file.
	* testsuite/25_algorithms/pstl/alg_sorting/minmax_element.cc: New file.
	* testsuite/25_algorithms/pstl/alg_sorting/partial_sort.cc: New file.
	* testsuite/25_algorithms/pstl/alg_sorting/partial_sort_copy.cc: New file.
	* testsuite/25_algorithms/pstl/alg_sorting/set.cc: New file.
	* testsuite/25_algorithms/pstl/alg_sorting/sort.cc: New file.
	* testsuite/26_numerics/pstl/numeric_ops/adjacent_difference.cc: New file.
	* testsuite/26_numerics/pstl/numeric_ops/reduce.cc: New file.
	* testsuite/26_numerics/pstl/numeric_ops/scan.cc: New file.
	* testsuite/26_numerics/pstl/numeric_ops/transform_reduce.cc: New file.
	* testsuite/26_numerics/pstl/numeric_ops/transform_scan.cc: New file.
	* testsuite/testsuite/20_util/specialized_algorithms/pstl/uninitialized_construct.cc: New file.
	* testsuite/testsuite/20_util/specialized_algorithms/pstl/uninitialized_copy_move.cc: New file.
	* testsuite/testsuite/20_util/specialized_algorithms/pstl/uninitialized_fill_destroy.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_merge/inplace_merge.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_merge/merge.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/copy_if.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/copy_move.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/fill.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/generate.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/is_partitioned.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/partition.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/partition_copy.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/remove.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/remove_copy.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/replace.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/replace_copy.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/rotate.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/rotate_copy.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/swap_ranges.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/transform_binary.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/transform_unary.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/unique.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_modifying_operations/unique_copy_equal.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/adjacent_find.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/all_of.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/any_of.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/count.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/equal.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/find.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/find_end.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/find_first_of.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/find_if.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/for_each.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/mismatch.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/none_of.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/nth_element.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/reverse.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/reverse_copy.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_nonmodifying/search_n.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_sorting/includes.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_sorting/is_heap.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_sorting/is_sorted.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_sorting/lexicographical_compare.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_sorting/minmax_element.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_sorting/partial_sort.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_sorting/partial_sort_copy.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_sorting/set.cc: New file.
	* testsuite/testsuite/25_algorithms/pstl/alg_sorting/sort.cc: New file.
	* testsuite/testsuite/26_numerics/pstl/numeric_ops/adjacent_difference.cc: New file.
	* testsuite/testsuite/26_numerics/pstl/numeric_ops/reduce.cc: New file.
	* testsuite/testsuite/26_numerics/pstl/numeric_ops/scan.cc: New file.
	* testsuite/testsuite/26_numerics/pstl/numeric_ops/transform_reduce.cc: New file.
	* testsuite/testsuite/26_numerics/pstl/numeric_ops/transform_scan.cc: New file.

2019-03-21  Jonathan Wakely  <jwakely@redhat.com>

	* include/c_compatibility/math.h [!__STDCPP_WANT_MATH_SPEC_FUNCS__]
	(assoc_laguerre, assoc_laguerref, assoc_laguerrel, assoc_legendre)
	(assoc_legendref, assoc_legendrel, beta, betaf, betal, comp_ellint_1)
	(comp_ellint_1f, comp_ellint_1l, comp_ellint_2, comp_ellint_2f)
	(comp_ellint_2l, comp_ellint_3, comp_ellint_3f, comp_ellint_3l)
	(cyl_bessel_i, cyl_bessel_if, cyl_bessel_il, cyl_bessel_j)
	(cyl_bessel_jf, cyl_bessel_jl, cyl_bessel_k, cyl_bessel_kf)
	(cyl_bessel_kl, cyl_neumann, cyl_neumannf, cyl_neumannl, ellint_1)
	(ellint_1f, ellint_1l, ellint_2, ellint_2f, ellint_2l, ellint_3)
	(ellint_3f, ellint_3l, expint, expintf, expintl, hermite, hermitef)
	(hermitel, laguerre, laguerref, laguerrel, legendre, legendref)
	(legendrel, riemann_zeta, riemann_zetaf, riemann_zetal, sph_bessel)
	(sph_besself, sph_bessell, sph_legendre, sph_legendref, sph_legendrel)
	(sph_neumann, sph_neumannf, sph_neumannl): Only add using-declarations
	when the special functions IS is enabled, not for C++17.
	* testsuite/26_numerics/headers/cmath/functions_global_c++17.cc:
	Replace with ...
	* testsuite/26_numerics/headers/cmath/functions_global.cc: New test,
	without checks for special functions in C++17.
	* testsuite/26_numerics/headers/cmath/special_functions_global.cc:
	New test.

	PR libstdc++/88066
	* include/backward/hash_map: Use <> for includes not "".
	* include/backward/hash_set: Likewise.
	* include/backward/strstream: Likewise.
	* include/tr1/bessel_function.tcc: Likewise.
	* include/tr1/exp_integral.tcc: Likewise.
	* include/tr1/legendre_function.tcc: Likewise.
	* include/tr1/modified_bessel_func.tcc: Likewise.
	* include/tr1/riemann_zeta.tcc: Likewise.

2019-03-19  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/allocator.xml: Link to table documenting evolution
	of extension allocators.
	* doc/xml/manual/evolution.xml: Use angle brackets for header names.
	Document new headers in 7.2, 8.1 and 9.1 releases.
	* doc/xml/manual/using.xml: Adjust link target for new_allocator.
	* doc/html/*: Regenerate.

2019-03-12  John David Anglin  <dave.anglin@bell.net>

	PR libstdc++/89461
	* testsuite/lib/libstdc++.exp: Locate libatomic.
	* testsuite/lib/dg-options.exp (add_options_for_libatomic): New.
	* testsuite/20_util/shared_ptr/thread/default_weaktoshared.cc: Add
	libatomic options.
	* testsuite/20_util/shared_ptr/thread/mutex_weaktoshared.cc: Likewise.
	* testsuite/experimental/net/timer/waitable/cons.cc: Likewise.
	* testsuite/experimental/net/timer/waitable/dest.cc: Likewise.
	* testsuite/experimental/net/timer/waitable/ops.cc: Likewise.

2019-03-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89460
	* configure.ac: Check for sockatmark.
	* crossconfig.m4: Check for sockatmark.
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* include/experimental/internet (address_v4::_S_hton): Rename
	overloaded functions to _S_hton_16 and _S_ntoh_16.
	(address_v4::_S_ntoh): Rename to _S_ntoh_16 and _S_ntoh_32.
	(basic_endpoint): Adjust calls to _S_hton and _S_ntoh.
	* include/experimental/socket (basic_socket::at_mark): Check
	_GLIBCXX_HAVE_SOCKATMARK.

	* testsuite/29_atomics/atomic_flag/test_and_set/explicit-hle.cc: Use
	const variables instead of macros.

	PR libstdc++/89629
	* libsupc++/hash_bytes.cc [__SIZEOF_SIZE_T__ == 8] (_Hash_bytes):
	Use correct type for len_aligned.
	* testsuite/20_util/hash/89629.cc: New test.

2019-03-11  Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/89641
	* include/std/atomic (atomic<T>::store, atomic<T>::load,
	atomic<T>::exchange, atomic<T>::compare_exchange_weak,
	atomic<T>::compare_exchange_strong): Cast __m or __s and __f to int.
	* include/bits/atomic_base.h (__atomic_base<T>::operator++,
	__atomic_base<T>::operator--, __atomic_base<T>::operator+=,
	__atomic_base<T>::operator-=, __atomic_base<T>::operator&=,
	__atomic_base<T>::operator|=, __atomic_base<T>::operator^=,
	__atomic_base<T*>::operator++, __atomic_base<T*>::operator--,
	__atomic_base<T*>::operator+=, __atomic_base<T*>::operator-=): Cast
	memory_order_seq_cst to int.

2019-03-08  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/using.xml: Use link element instead of xref.
	* doc/html/*: Regenerate.

	* include/bits/fs_path.h (path::format): Add fixed underlying type.

2019-03-08  François Dumont  <fdumont@gcc.gnu.org>

	PR libstdc++/89477
	* include/debug/map.h (map): Use _RequireNotAllocator to constrain
	parameters in deduction guides.
	* include/debug/multimap.h (multimap): Likewise.
	* include/debug/set.h (multimap): Likewise.
	* include/debug/multiset.h (multimap): Likewise.
	* include/debug/unordered_map (unordered_map): Likewise.
	(unordered_multimap): Likewise.
	* include/debug/unordered_set (unordered_set): Likewise.
	(unordered_multiset): Likewise.

	PR libstdc++/89608
	* include/debug/unordered_map (unordered_map<>::_M_check_rehashed):
	Invalidate all iterators in case of rehash.
	(unordered_multimap<>::_M_check_rehashed): Likewise.
	* include/debug/unordered_set
	(unordered_set<>::_M_check_rehashed): Likewise.
	(unordered_multiset<>::_M_check_rehashed): Likewise.
	* testsuite/23_containers/unordered_set/debug/89608_neg.cc: New.

2019-03-07  Andreas Schwab  <schwab@suse.de>

	* config/abi/post/riscv64-linux-gnu: New directory.
	* config/abi/post/riscv64-linux-gnu/baseline_symbols.txt: New file.

2019-03-07  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/function_objects/bind_front/1.cc: Change from
	compile test to run. Fix typo.

	* doc/xml/manual/status_cxx2020.xml: Update C++20 status.
	* doc/html/*: Regenerate.

	P0356R5 Simplified partial function application
	* include/std/functional [C++20] (_Bind_front, _Bind_front_t): Define
	helpers for bind_front.
	(bind_front, __cpp_lib_bind_front): Define.
	* testsuite/20_util/function_objects/bind_front/1.cc: New test.

2019-03-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/type_traits (__cpp_lib_bounded_array_traits): Define.
	* include/std/version (__cpp_lib_bounded_array_traits): Likewise.
	* testsuite/20_util/is_bounded_array/value.cc: Check for macro.
	* testsuite/20_util/is_unbounded_array/value.cc: Likewise.

2019-03-06  Edward Smith-Rowland  <3dw4rd@verizon.net>

	PR libstdc++/86655 - std::assoc_legendre should not constrain
	the value of m (or x).
	* include/tr1/legendre_function.tcc (__assoc_legendre_p,
	__sph_legendre): If degree > order Don't throw, return 0.
	(__legendre_p, __assoc_legendre_p): Don't constrain x either.
	* testsuite/special_functions/02_assoc_legendre/pr86655.cc: New test.
	* testsuite/special_functions/20_sph_legendre/pr86655.cc: New test.
	* testsuite/tr1/5_numerical_facilities/special_functions/
	02_assoc_legendre/pr86655.cc: New test.
	* testsuite/tr1/5_numerical_facilities/special_functions/
	22_sph_legendre/pr86655.cc: New test.

2019-03-06  Ville Voutilainen  <ville.voutilainen@gmail.com>

	Rewrite variant.
	Also PR libstdc++/85517
	* include/std/variant (__do_visit): New.
	(__variant_cast): Likewise.
	(__variant_cookie): Likewise.
	(__erased_*): Remove.
	(_Variant_storage::_S_vtable): Likewise.
	(_Variant_storage::__M_reset_impl): Adjust to use __do_visit.
	(_Variant_storage::__M_reset): Adjust.
	(__variant_construct): New.
	(_Copy_ctor_base(const _Copy_ctor_base&)): Adjust to use
	__variant_construct.
	(_Move_ctor_base(_Move_ctor_base&&)): Likewise.
	(_Move_ctor_base::__M_destructive_copy): New.
	(_Move_ctor_base::__M_destructive_move): Adjust to use
	__variant_construct.
	(_Copy_assign_base::operator=): Adjust to use __do_visit.
	(_Copy_assign_alias): Adjust to check both copy assignment
	and copy construction for triviality.
	(_Move_assign_base::operator=): Adjust to use __do_visit.
	(_Multi_array): Add support for visitors that accept and return
	a __variant_cookie.
	(__gen_vtable_impl::_S_apply_all_alts): Likewise.
	(__gen_vtable_impl::_S_apply_single_alt): Likewise.
	(__gen_vtable_impl::__element_by_index_or_cookie): New. Generate
	a __variant_cookie temporary for a variant that is valueless and..
	(__gen_vtable_impl::__visit_invoke): ..adjust here.
	(__gen_vtable::_Array_type): Conditionally make space for
	the __variant_cookie visitor case.
	(__variant_construct_by_index): New.
	(get_if): Adjust to use std::addressof.
	(relops): Adjust to use __do_visit.
	(variant): Add __variant_cast and __variant_construct_by_index
	as friends.
	(variant::emplace): Use _M_reset() and __variant_construct_by_index
	instead of self-destruction.
	(variant::swap): Adjust to use __do_visit.
	(visit): Reimplement in terms of __do_visit.
	(__variant_hash_call_base_impl::operator()): Adjust to use __do_visit.
	* testsuite/20_util/variant/compile.cc: Adjust.
	* testsuite/20_util/variant/run.cc: Likewise.

2019-03-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/c++config.h (_cpp_lib_char8_t): Add L suffix to
	constant.
	* testsuite/experimental/feat-char8_t.cc: Likewise.

	 * include/std/type_traits [C++20] (is_bounded_array)
	 (is_unbounded_array, is_bounded_array_v, is_unbounded_array_v):
	 Define.
	 * testsuite/20_util/is_bounded_array/requirements/
	 explicit_instantiation.cc: New test.
	 * testsuite/20_util/is_bounded_array/requirements/typedefs.cc: New
	 test.
	 * testsuite/20_util/is_bounded_array/value.cc: New test.
	 * testsuite/20_util/is_unbounded_array/requirements/
	 explicit_instantiation.cc: New test.
	 * testsuite/20_util/is_unbounded_array/requirements/typedefs.cc: New
	 * test.
	 * testsuite/20_util/is_unbounded_array/value.cc: New test.

	* include/bits/ptr_traits.h [C++20] (pointer_traits<T*>::pointer_to):
	Add constexpr.
	* testsuite/20_util/pointer_traits/pointer_to_constexpr.cc: New test.

2019-03-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/c_compatibility/math.h [C++20] (lerp): Add using
	declaration.
	* include/c_global/cmath [C++20] (__cpp_lib_interpolate): Define.
	(__lerp): Define function template to implement lerp.
	(lerp(float, float, float), lerp(double, double, double))
	(lerp(long double, long double, long double)): Define for C++20.
	* include/std/numeric [C++20] (__cpp_lib_interpolate): Define.
	(midpoint(T, T), midpoint(T*, T*)): Define.
	* include/std::version [C++20] (__cpp_lib_interpolate): Define.
	* testsuite/26_numerics/lerp.cc: New test.
	* testsuite/26_numerics/midpoint/floating.cc: New test.
	* testsuite/26_numerics/midpoint/integral.cc: New test.
	* testsuite/26_numerics/midpoint/pointer.cc: New test.

2019-03-04  Edward Smith-Rowland  <3dw4rd@verizon.net>

	PR libstdc++/88996 Implement P0439R0
	Make std::memory_order a scoped enumeration.
	* include/bits/atomic_base.h: For C++20 make memory_order a scoped enum,
	add variables for the old enumerators.  Adjust calls.
	* testsuite/29_atomics/headers/atomic/types_std_c++2a.cc: New test.
	* testsuite/29_atomics/headers/atomic/types_std_c++2a_neg.cc: New test.

2019-03-04  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/26_numerics/bit/bitops.rot/rotl.cc: Remove bogus dg-do
	directive.

	* include/std/memory_resource (polymorphic_allocator): Add default
	template argument for C++20.
	(polymorphic_allocator::allocate_bytes)
	(polymorphic_allocator::deallocate_bytes)
	(polymorphic_allocator::allocate_object)
	(polymorphic_allocator::deallocate_object)
	(polymorphic_allocator::new_object)
	(polymorphic_allocator::delete_object): New member functions for
	C++20.
	* testsuite/20_util/polymorphic_allocator/allocate_object.cc: New
	test.

2019-03-03  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89562
	* src/filesystem/ops-common.h (do_copy_file): Open files in binary
	mode for mingw.

2019-03-01  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/util/testsuite_allocator.h (__gnu_test::memory_resource)
	[!__cpp_sized_deallocation]: Do not pass size to operator delete.

	* include/std/memory (uses_allocator_construction_args): New set of
	overloaded functions.
	(make_obj_using_allocator, uninitialized_construct_using_allocator):
	New functions.
	* include/std/memory_resource (polymorphic_allocator::construct)
	[__cplusplus > 201703l]: Replace all overloads with a single function
	using uses_allocator_construction_args.
	* testsuite/20_util/polymorphic_allocator/construct_c++2a.cc: New
	test.
	* testsuite/20_util/uses_allocator/make_obj.cc: New test.

2019-02-27  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89466
	* acinclude.m4 (GLIBCXX_CONFIGURE_DOCBOOK): Reorder check for local
	stylesheet directories before check for xsltproc. Try to use
	xmlcatalog to find local stylesheet directory before trying hardcoded
	paths. Add path used by suse to hardcoded paths. Adjust xsltproc
	check to look for the same stylesheet as doc/Makefile.am uses. Don't
	use xsltproc if xmlcatalog fails to find a local stylesheet.
	* configure.ac: Check for xmlcatalog.
	* Makefile.in: Regenerate.
	* configure: Likewise.
	* doc/Makefile.in: Likewise.
	* include/Makefile.in: Likewise.
	* libsupc++/Makefile.in: Likewise.
	* po/Makefile.in: Likewise.
	* python/Makefile.in: Likewise.
	* src/Makefile.in: Likewise.
	* src/c++11/Makefile.in: Likewise.
	* src/c++17/Makefile.in: Likewise.
	* src/c++98/Makefile.in: Likewise.
	* src/filesystem/Makefile.in: Likewise.
	* testsuite/Makefile.in: Likewise.

2019-02-26  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89477
	* include/bits/alloc_traits.h (_RequireNotAllocator): New helper for
	container deduction guides.
	* include/bits/hashtable.h (_RequireNotAllocatorOrIntegral): Likewise.
	* include/bits/stl_map.h (map): Use _RequireNotAllocator to constrain
	parameters in deduction guides.
	* include/bits/stl_multimap.h (multimap): Likewise.
	* include/bits/stl_multiset.h (multiset): Likewise.
	* include/bits/stl_queue.h (queue, priority_queue): Likewise.
	* include/bits/stl_set.h (set): Likewise.
	* include/bits/stl_stack.h (stack): Likewise.
	* include/bits/unordered_map.h (unordered_map, unordered_multimap):
	use _RequireNotAllocator and _RequireNotAllocatorOrIntegral to
	constrain parameters in deduction guides.
	* include/bits/unordered_set.h (unordered_set, unordered_multiset):
	Likewise.
	* testsuite/23_containers/map/cons/deduction.cc: Test additional
	deduction cases.
	* testsuite/23_containers/multiset/cons/deduction.cc: Likewise.
	* testsuite/23_containers/set/cons/deduction.cc: Likewise.
	* testsuite/23_containers/unordered_map/cons/deduction.cc: Likewise.
	* testsuite/23_containers/unordered_multimap/cons/deduction.cc:
	Likewise.
	* testsuite/23_containers/unordered_multiset/cons/deduction.cc:
	Likewise.
	* testsuite/23_containers/unordered_set/cons/deduction.cc: Likewise.

	PR libstdc++/89416
	* include/bits/alloc_traits.h (__is_alloc_insertable_impl): Change
	to class template and partial specialization using void_t.
	(__is_copy_insertable, __is_move_insertable): Adjust base class.

2019-02-24  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89416
	* include/bits/alloc_traits.h (__is_alloc_insertable_impl): Make
	copy and move members public.

2019-02-23  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/type_traits (__underlying_type_impl): New helper to
	make underlying_type SFINAE-friendly.
	(underlying_type): Derive from __underlying_type_impl.
	* testsuite/20_util/underlying_type/requirements/typedefs-3.cc: New
	test.

	PR libstdc++/89446
	* include/bits/char_traits.h (__constant_char_array): Check index is
	in range before dereferencing.
	(char_traits<char>::compare, char_traits<char>::find)
	(char_traits<char8_t>::compare, char_traits<char8_t>::find): Return
	immediately if n is zero.
	(char_traits<wchar_t>::compare, char_traits<wchar_t>::find): Likewise.
	Remove workarounds for PR 67026.
	* testsuite/21_strings/basic_string_view/operators/char/89446.cc:
	New test.
	* testsuite/21_strings/basic_string_view/operators/wchar_t/89446.cc:
	New test.

2019-02-22  Eric Botcazou  <ebotcazou@adacore.com>

	* config/abi/post/sparc64-linux-gnu/baseline_symbols.txt: Adjust.
	* config/abi/post/sparc64-linux-gnu/32/baseline_symbols.txt: Likewise.

2019-02-22  Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/89402
	* src/c++98/compatibility-ldbl.cc (_ZNKSt4hashIeEclEe): Change return
	type to std::size_t and argument to type to long double.

2019-02-22  Eric Botcazou  <ebotcazou@adacore.com>

	* configure.host (abi_baseline_pair): Adjust for SPARC64/Linux.
	* config/abi/post/sparc64-linux-gnu: New directory.
	* config/abi/post/sparc64-linux-gnu/baseline_symbols.txt: New file.
	* config/abi/post/sparc64-linux-gnu/32: New directory.
	* config/abi/post/sparc64-linux-gnu/32/baseline_symbols.txt: New file.

2019-02-21  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/29_atomics/headers/atomic/types_std_c++20.cc: New test.
	* testsuite/29_atomics/headers/atomic/types_std_c++20_neg.cc: New
	test.

2019-02-22  Tom Honermann  <tom@honermann.net>

	* python/libstdcxx/v6/printers.py (register_type_printers): Add type
	printers for u8string and u8string_view.

2019-02-22  Tom Honermann  <tom@honermann.net>

	* testsuite/18_support/byte/ops.cc: Validate
	std::to_integer<char8_t>, std::to_integer<char16_t>, and
	std::to_integer<char32_t>.
	* testsuite/18_support/numeric_limits/dr559.cc: Validate
	std::numeric_limits<char8_t>.
	* testsuite/18_support/numeric_limits/lowest.cc: Validate
	std::numeric_limits<char8_t>::lowest().
	* testsuite/18_support/numeric_limits/max_digits10.cc: Validate
	std::numeric_limits<char8_t>::max_digits10.
	* testsuite/18_support/type_info/fundamental.cc: Validate
	typeinfo for char8_t.
	* testsuite/20_util/from_chars/1_c++20_neg.cc: New test, validating
	std::from_chars with char8_t.
	* testsuite/20_util/hash/requirements/explicit_instantiation.cc:
	Validate explicit instantiation of std::hash<char8_t>.
	* testsuite/20_util/is_integral/value.cc: Validate
	std::is_integral<char8_t>.
	* testsuite/20_util/make_signed/requirements/typedefs-4.cc:
	Validate std::make_signed<char8_t>.
	* testsuite/21_strings/basic_string/cons/char/deduction.cc:
	Validate u8string construction from char8_t sources.
	* testsuite/21_strings/basic_string/types/pmr_typedefs.cc: Validate
	std::pmr::u8string.
	* testsuite/21_strings/basic_string_view/operations/compare/
	char/70483.cc: Validate substr operations on u8string_view.
	* testsuite/21_strings/basic_string_view/typedefs.cc: Validate that
	the u8string_view typedef is defined.
	* testsuite/21_strings/char_traits/requirements/
	constexpr_functions.cc: Validate char_traits<char8_t> constexpr
	member functions.
	* testsuite/21_strings/char_traits/requirements/
	constexpr_functions_c++17.cc: Validate char_traits<char8_t> C++17
	constexpr member functions.
	* testsuite/21_strings/headers/string/types_std_c++0x.cc: Validate
	that the u8string typedef is defined.
	* testsuite/22_locale/locale/cons/unicode.cc: Validate the presence
	of the std::codecvt<char16_t, char8_t, std::mbstate_t> and
	std::codecvt<char32_t, char8_t, std::mbstate_t> facets.
	* testsuite/29_atomics/atomic/cons/assign_neg.cc: Update line
	numbers.
	* testsuite/29_atomics/atomic/cons/copy_neg.cc: Likewise.
	* testsuite/29_atomics/atomic_integral/cons/assign_neg.cc:
	Likewise.
	* testsuite/29_atomics/atomic_integral/cons/copy_neg.cc: Likewise.
	* testsuite/29_atomics/atomic_integral/is_always_lock_free.cc:
	Validate std::atomic<char8_t>::is_always_lock_free
	* testsuite/29_atomics/atomic_integral/operators/bitwise_neg.cc:
	Update line numbers.
	* testsuite/29_atomics/atomic_integral/operators/decrement_neg.cc:
	Likewise.
	* testsuite/29_atomics/atomic_integral/operators/increment_neg.cc:
	Likewise.
	* testsuite/experimental/polymorphic_allocator/pmr_typedefs_string.cc:
	Validate std::experimental::pmr::u8string.
	* testsuite/experimental/string_view/typedefs.cc: Validate that the
	u8string_view typedef is defined.
	* testsuite/util/testsuite_common_types.h: Add char8_t, char16_t and
	char32_t to the typelists.

2019-02-22  Tom Honermann  <tom@honermann.net>

	* include/ext/typelist.h: Constrain a partial specialization of
	typelist::detail::append_ to only match chain<T1,T2>.

2019-02-21  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89416
	* include/bits/alloc_traits.h (__is_alloc_insertable_impl): Replace
	class template with class. Replace move and copy member types with
	member alias templates, so they are only instantiated when needed.
	(__is_copy_insertable, __is_move_insertable): Adjust base class.
	* testsuite/23_containers/vector/modifiers/push_back/89130.cc: Enable
	test for C++11/14/17 as well.
	* testsuite/23_containers/vector/modifiers/push_back/89416.cc: New
	test.

2019-02-20  Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/89402
	* src/c++98/compatibility-ldbl.cc (_ZNKSt4hashIeEclEe): Add
	_GLIBCXX_PURE to the alias declaration.

2019-02-19  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/21_strings/basic_string/literals/types.cc
	[_GLIBCXX_USE_CHAR8_T]: Adjust expected string type for u8 literal.
	* testsuite/21_strings/basic_string/literals/values.cc
	[_GLIBCXX_USE_CHAR8_T]: Likewise.
	* testsuite/22_locale/codecvt/char16_t.cc: Adjust for u8 literals
	potentially having different type.
	* testsuite/22_locale/codecvt/char32_t.cc: Likewise.
	* testsuite/22_locale/codecvt/codecvt_utf8/79980.cc: Cast u8 literal
	to char.
	* testsuite/22_locale/codecvt/codecvt_utf8/wchar_t/1.cc: Likewise.
	* testsuite/22_locale/codecvt/utf8.cc: Likewise.
	* testsuite/22_locale/conversions/string/2.cc: Remove u8 prefix from
	string literals only using basic character set.
	* testsuite/22_locale/conversions/string/3.cc: Likewise. Cast other
	u8 literals to char.
	* testsuite/29_atomics/headers/atomic/macros.cc [_GLIBCXX_USE_CHAR8_T]:
	Test ATOMIC_CHAR8_T_LOCK_FREE.
	Add missing #error to ATOMIC_CHAR16_T_LOCK_FREE test.
	* testsuite/29_atomics/headers/atomic/types_std_c++0x.cc
	[_GLIBCXX_USE_CHAR8_T]: Check for std::atomic_char8_t.
	* testsuite/experimental/string_view/literals/types.cc
	[_GLIBCXX_USE_CHAR8_T]: Adjust expected string_view type for u8
	literal.
	* testsuite/experimental/string_view/literals/values.cc
	[_GLIBCXX_USE_CHAR8_T]: Likewise.

2019-02-19  Tom Honermann  <tom@honermann.net>

	* testsuite/18_support/numeric_limits/char8_t.cc: New test cloned
	from char16_32_t.cc; validates numeric_limits<char8_t>.
	* testsuite/21_strings/basic_string/literals/types-char8_t.cc: New
	test cloned from types.cc; validates operator""s for char8_t
	returns u8string.
	* testsuite/21_strings/basic_string/literals/values-char8_t.cc: New
	test cloned from values.cc; validates construction and comparison
	of u8string values.
	* testsuite/21_strings/basic_string/requirements/
	/explicit_instantiation/char8_t/1.cc: New test cloned from
	char16_t/1.cc; validates explicit instantiation of
	basic_string<char8_t>.
	* testsuite/21_strings/basic_string_view/literals/types-char8_t.cc:
	New test cloned from types.cc; validates operator""sv for char8_t
	returns u8string_view.
	* testsuite/21_strings/basic_string_view/literals/
	values-char8_t.cc: New test cloned from values.cc; validates
	construction and comparison of u8string_view values.
	* testsuite/21_strings/basic_string_view/requirements/
	explicit_instantiation/char8_t/1.cc: New test cloned from
	char16_t/1.cc; validates explicit instantiation of
	basic_string_view<char8_t>.
	* testsuite/21_strings/char_traits/requirements/char8_t/65049.cc:
	New test cloned from char16_t/65049.cc; validates that
	char_traits<char8_t> is not vulnerable to the concerns in PR65049.
	* testsuite/21_strings/char_traits/requirements/char8_t/
	typedefs.cc: New test cloned from char16_t/typedefs.cc; validates
	that char_traits<char8_t> member typedefs are present and correct.
	* testsuite/21_strings/char_traits/requirements/
	explicit_instantiation/char8_t/1.cc: New test cloned from
	char16_t/1.cc; validates explicit instantiation of
	char_traits<char8_t>.
	* testsuite/22_locale/codecvt/char16_t-char8_t.cc: New test cloned
	from char16_t.cc: validates
	codecvt<char16_t, char8_t, mbstate_t>.
	* testsuite/22_locale/codecvt/char32_t-char8_t.cc: New test cloned
	from char32_t.cc: validates
	codecvt<char32_t, char8_t, mbstate_t>.
	* testsuite/22_locale/codecvt/utf8-char8_t.cc: New test cloned from
	utf8.cc; validates codecvt<char16_t, char8_t, std::mbstate_t> and
	codecvt<char32_t, char8_t, std::mbstate_t>.
	* testsuite/27_io/filesystem/path/native/string-char8_t.cc: New
	test cloned from string.cc; validates filesystem::path construction
	from char8_t input.
	* testsuite/experimental/feat-char8_t.cc: New test; validates that
	the __cpp_lib_char8_t feature test macro is defined with the
	correct value.
	* testsuite/experimental/filesystem/path/native/string-char8_t.cc:
	New test cloned from string.cc; validates filesystem::path
	construction from char8_t input.
	* testsuite/experimental/string_view/literals/types-char8_t.cc: New
	test cloned from types.cc; validates operator""sv for char8_t
	returns u8string_view.
	* testsuite/experimental/string_view/literals/values-char8_t.cc:
	New test cloned from values.cc; validates construction and
	comparison of u8string_view values.
	* testsuite/experimental/string_view/requirements/
	explicit_instantiation/char8_t/1.cc: New test cloned from
	char16_t/1.cc; validates explicit instantiation of
	basic_string_view<char8_t>.
	* testsuite/ext/char8_t/atomic-1.cc: New test; validates that
	ATOMIC_CHAR8_T_LOCK_FREE is not defined if char8_t support is not
	enabled.

2019-02-19  Tom Honermann  <tom@honermann.net>

	P0482R5 char8_t: Standard library support
	* config/abi/pre/gnu-versioned-namespace.ver (CXXABI_2.0): Add
	typeinfo symbols for char8_t.
	* config/abi/pre/gnu.ver: Add CXXABI_1.3.12.
	(GLIBCXX_3.4.26): Add symbols for specializations of
	numeric_limits and codecvt that involve char8_t.
	(CXXABI_1.3.12): Add typeinfo symbols for char8_t.
	* include/bits/atomic_base.h: Add atomic_char8_t.
	* include/bits/basic_string.h: Add std::hash<u8string> and
	operator""s(const char8_t*, size_t).
	* include/bits/c++config: Define _GLIBCXX_USE_CHAR8_T and
	__cpp_lib_char8_t.
	* include/bits/char_traits.h: Add char_traits<char8_t>.
	* include/bits/codecvt.h: Add
	codecvt<char16_t, char8_t, mbstate_t>,
	codecvt<char32_t, char8_t, mbstate_t>,
	codecvt_byname<char16_t, char8_t, mbstate_t>, and
	codecvt_byname<char32_t, char8_t, mbstate_t>.
	* include/bits/cpp_type_traits.h: Add __is_integer<char8_t> to
	recognize char8_t as an integral type.
	* include/bits/fs_path.h: (path::__is_encoded_char): Recognize
	char8_t.
	(path::u8string): Return std::u8string when char8_t support is
	enabled.
	(path::generic_u8string): Likewise.
	(path::_S_convert): Handle conversion from char8_t input.
	(path::_S_str_convert): Likewise.
	* include/bits/functional_hash.h: Add hash<char8_t>.
	* include/bits/locale_conv.h (__str_codecvt_out): Add overloads for
	char8_t.
	* include/bits/locale_facets.h (_GLIBCXX_NUM_UNICODE_FACETS): Bump
	for new char8_t specializations.
	* include/bits/localefwd.h: Add missing declarations of
	codecvt<char16_t, char, mbstate_t> and
	codecvt<char32_t, char, mbstate_t>.  Add char8_t declarations
	codecvt<char16_t, char8_t, mbstate_t> and
	codecvt<char32_t, char8_t, mbstate_t>.
	* include/bits/postypes.h: Add u8streampos
	* include/bits/stringfwd.h: Add declarations of
	char_traits<char8_t> and u8string.
	* include/c_global/cstddef: Add __byte_operand<char8_t>.
	* include/experimental/bits/fs_path.h (path::__is_encoded_char):
	Recognize char8_t.
	(path::u8string): Return std::u8string when char8_t support is
	enabled.
	(path::generic_u8string): Likewise.
	(path::_S_convert): Handle conversion from char8_t input.
	(path::_S_str_convert): Likewise.
	* include/experimental/string: Add u8string.
	* include/experimental/string_view: Add u8string_view,
	hash<experimental::u8string_view>, and
	operator""sv(const char8_t*, size_t).
	* include/std/atomic: Add atomic<char8_t> and atomic_char8_t.
	* include/std/charconv (__is_int_to_chars_type): Recognize char8_t
	as a character type.
	* include/std/limits: Add numeric_limits<char8_t>.
	* include/std/string_view: Add u8string_view,
	hash<experimental::u8string_view>, and
	operator""sv(const char8_t*, size_t).
	* include/std/type_traits: Add __is_integral_helper<char8_t>,
	__make_unsigned<char8_t>, and __make_signed<char8_t>.
	* libsupc++/atomic_lockfree_defines.h: Define
	ATOMIC_CHAR8_T_LOCK_FREE.
	* src/c++11/Makefile.am: Compile with -fchar8_t when compiling
	codecvt.cc and limits.cc so that char8_t specializations of
	numeric_limits and codecvt and emitted.
	* src/c++11/Makefile.in: Likewise.
	* src/c++11/codecvt.cc: Define members of
	codecvt<char16_t, char8_t, mbstate_t>,
	codecvt<char32_t, char8_t, mbstate_t>,
	codecvt_byname<char16_t, char8_t, mbstate_t>, and
	codecvt_byname<char32_t, char8_t, mbstate_t>.
	* src/c++11/limits.cc: Define members of
	numeric_limits<char8_t>.
	* src/c++98/Makefile.am: Compile with -fchar8_t when compiling
	locale_init.cc and localename.cc.
	* src/c++98/Makefile.in: Likewise.
	* src/c++98/locale_init.cc: Add initialization for the
	codecvt<char16_t, char8_t, mbstate_t> and
	codecvt<char32_t, char8_t, mbstate_t> facets.
	* src/c++98/localename.cc: Likewise.
	* testsuite/util/testsuite_abi.cc: Validate ABI bump.

2019-02-18  Wilco Dijkstra  <wdijkstr@arm.com>

	* 27_io/filesystem/operations/all.cc: Add dg-require-filesystem-ts.
	* 27_io/filesystem/operations/resize_file.cc: Likewise.
	* 27_io/filesystem/path/generation/normal2.cc: Likewise.

2019-02-14  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2020.xml: Update P0887R1 status.
	* doc/html/*: Regenerate.

	* doc/xml/manual/status_cxx2017.xml: Add P0063R3 to status table.
	* doc/html/*: Regenerate.

	* doc/xml/manual/intro.xml: Document LWG 2586 status.
	* include/bits/uses_allocator.h (__uses_alloc): Use const lvalue
	allocator type in is_constructible checks.
	* testsuite/20_util/scoped_allocator/69293_neg.cc: Adjust dg-error.
	* testsuite/20_util/scoped_allocator/dr2586.cc: New test.
	* testsuite/20_util/tuple/cons/allocators.cc: Add test using
	problematic type from LWG 2586 discussion.
	* testsuite/20_util/uses_allocator/69293_neg.cc: Adjust dg-error.
	* testsuite/20_util/uses_allocator/cons_neg.cc: Likewise.

	* configure.ac: Check for C11 timespec_get function.
	* crossconfig.m4 (freebsd, linux, gnu, cygwin, solaris, netbsd)
	(openbsd): Likewise
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* include/c_global/ctime (timespec, timespec_get): Add to namespace
	std for C++17 and up.

	* doc/xml/manual/intro.xml: Document LWG 2537 status.
	* include/bits/stl_queue.h
	(priority_queue(const Compare&, const Container&, const Alloc&))
	(priority_queue(const Compare&, Container&&, const Alloc&)): Call
	make_heap.
	* testsuite/23_containers/priority_queue/dr2537.cc: New test.

	* doc/xml/manual/intro.xml: Document LWG 2566 status.
	* include/bits/stl_queue.h (queue, priority_queue): Add static
	assertions to enforce LWG 2566 requirement on value_type.
	* include/bits/stl_stack.h (stack): Likewise.

	PR middle-end/89303
	* testsuite/20_util/enable_shared_from_this/89303.cc: New test.

	* doc/xml/manual/intro.xml: Document LWG 2735 status.
	* include/bits/std_abs.h: Add comment about LWG 2735.
	* testsuite/26_numerics/headers/cstdlib/dr2735.cc: New test.

2019-02-13  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89345
	* include/std/version [__cpp_impl_destroying_delete]
	(__cpp_lib_destroying_delete): Only define for C++2a and later.
	* libsupc++/new [__cpp_impl_destroying_delete]
	(__cpp_lib_destroying_delete): Likewise.
	(destroying_delete_t, destroying_delete): Likewise, but define even
	when __cpp_impl_destroying_delete is not defined.
	* testsuite/18_support/destroying_delete.cc: New test.

2019-02-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89023
	* testsuite/17_intro/headers/c++2011/parallel_mode.cc: New test.
	* testsuite/17_intro/headers/c++2014/parallel_mode.cc: New test.
	* testsuite/17_intro/headers/c++2017/parallel_mode.cc: New test.
	* testsuite/28_regex/headers/regex/parallel_mode.cc: Remove.

2019-02-09  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/71044
	* include/bits/fs_path.h (path::has_root_name)
	(path::has_root_directory, path::has_root_path)
	(path::has_relative_path, path::has_parent_path)
	(path::has_filename, path::has_stem, path::has_extension)
	(path::is_absolute, path::is_relative, path::_M_find_extension): Add
	noexcept.
	* src/c++17/fs_path.cc (path::has_root_name)
	(path::has_root_directory, path::has_root_path)
	(path::has_relative_path, path::has_parent_path)
	(path::has_filename, path::_M_find_extension): Add noexcept.

2019-02-06  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89102 (partial)
	* include/std/type_traits (common_type<>): Define.
	(common_type<T>): Derive from common_type<T, T>.
	* testsuite/20_util/common_type/requirements/explicit_instantiation.cc:
	Test zero-length template argument list.
	* testsuite/20_util/common_type/requirements/sfinae_friendly_1.cc:
	Test additional single argument cases.
	* testsuite/20_util/common_type/requirements/sfinae_friendly_2.cc:
	Adjust expected error.

2019-02-05  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89128
	* include/bits/stl_queue.h (queue, priority_queue): Add deduction
	guides.
	* include/bits/stl_stack.h (stack): Likewise.
	* testsuite/23_containers/priority_queue/deduction.cc: New test.
	* testsuite/23_containers/queue/deduction.cc: New test.
	* testsuite/23_containers/stack/deduction.cc: New test.

	PR libstdc++/89194
	* include/std/type_traits (__is_convertible_helper)
	(__is_convertible_helper<_From, _To, false>): Revert changes to
	support is_nothrow_convertible.
	(__is_nt_convertible_helper): New helper.
	(is_nothrow_convertible): Use __is_nt_convertible_helper.

	* testsuite/23_containers/vector/modifiers/push_back/49836.cc: Restore
	use of CopyConsOnlyType, but also test DelAnyAssign for completeness.

	PR libstdc++/89130
	* include/bits/alloc_traits.h (__is_copy_insertable_impl): Rename to
	__is_alloc_insertable_impl. Replace single type member with two
	members, one for each of copy and move insertable.
	(__is_move_insertable): New trait for internal use.
	* include/bits/stl_vector.h (vector::_S_nothrow_relocate(true_type))
	(vector::_S_nothrow_relocate(true_type)): New functions to
	conditionally check if __relocate_a can throw.
	(vector::_S_use_relocate()): Dispatch to _S_nothrow_relocate based
	on __is_move_insertable.
	(vector::_S_do_relocate): New overloaded functions to conditionally
	call __relocate_a.
	(vector::_S_relocate): New function that dispatches to _S_do_relocate
	based on _S_use_relocate.
	* include/bits/vector.tcc (vector::reserve, vector::_M_realloc_insert)
	(vector::_M_default_append): Call _S_relocate instead of __relocate_a.
	* testsuite/23_containers/vector/modifiers/push_back/89130.cc: New.

	PR libstdc++/89090
	* include/bits/stl_uninitialized.h (__relocate_a_1): Make unused
	parameter unnamed. Add message to static assertion.
	* include/bits/vector.tcc (vector::reserve, vector::_M_realloc_insert)
	(vector::_M_default_append): Use _GLIBCXX17_CONSTEXPR for if constexpr
	in C++11 code.

2019-02-05  Marc Glisse  <marc.glisse@inria.fr>

	PR libstdc++/87106
	* include/bits/stl_uninitialized.h (__is_trivially_relocatable):
	Rename...
	(__is_bitwise_relocatable): ... to this.
	(__relocate_a_1): Adapt.
	* include/bits/stl_deque.h (__is_trivially_relocatable): Rename...
	(__is_bitwise_relocatable): ... to this.

2019-01-30  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89117
	* src/c++17/fs_path.cc (path::replace_extension): Erase extension from
	final component as well as from _M_pathname. Append the dot using
	operator+= instead of only to _M_pathname.
	(path::_M_find_extension): Reformat slightly.
	* testsuite/27_io/filesystem/path/modifiers/replace_extension.cc:
	Add more test cases.

2019-01-30  Ulrich Drepper  <drepper@redhat.com>

	* doc/xml/manual/status_cxx2020.xml: Update P0600 entry.

2019-01-29  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/26_numerics/headers/complex/synopsis.cc: Remove incorrect
	constexpr specifiers from arg and proj.

	* config/abi/pre/gnu.ver (GLIBCXX_3.4.26): Add missing exports for
	__shared_ptr instantiations used by gcc4-compatible ABI.

	* include/experimental/forward_list (experimental::erase): Qualify
	call to erase_if.
	* include/experimental/list (experimental::erase): Likewise.
	* include/std/forward_list (std::erase): Likewise.
	* include/std/list (std::erase): Likewise.

	* testsuite/20_util/reference_wrapper/result_type.cc: Disable for
	C++2a.
	* testsuite/20_util/reference_wrapper/typedefs-2.cc: Likewise.
	* testsuite/20_util/reference_wrapper/typedefs-3.cc: Likewise.
	* testsuite/20_util/reference_wrapper/typedefs.cc: Likewise.
	* testsuite/30_threads/async/54297.cc: Suppress nodiscard warning.
	* testsuite/ext/array_allocator/26875.cc: Likewise.
	* testsuite/ext/pool_allocator/allocate_chunk.cc: Likewise.
	* testsuite/util/replacement_memory_operators.h: Likewise.
	* testsuite/util/testsuite_allocator.h: Likewise.

	* include/std/memory_resource (__pool_resource::_M_unpooled): Use
	normal mode vector, even for debug mode.
	* include/std/vector [_GLIBCXX_DEBUG] (_GLIBCXX_STD_C::pmr::vector):
	Define alias template for normal mode vector.

2019-01-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/68737
	* config/locale/generic/c_locale.h (__convert_from_v)
	[_GLIBCXX_USE_C99_STDIO]: Also check _GLIBCXX_HAVE_BROKEN_VSNPRINTF.
	* config/os/hpux/os_defines.h: Define _GLIBCXX_HAVE_BROKEN_VSNPRINTF.
	* include/bits/locale_facets.tcc (num_put::_M_insert_float)
	[_GLIBCXX_USE_C99_STDIO]: Also check _GLIBCXX_HAVE_BROKEN_VSNPRINTF.

2019-01-24  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/88840
	* include/bits/stl_vector.h (vector::__use_relocate): Replace static
	data member with static member function _S_use_relocate().
	* include/bits/vector.tcc (vector::reserve, vector::_M_realloc_insert)
	(vector::_M_default_append): Use _S_use_relocate() instead of
	__use_relocate.

	* testsuite/27_io/filesystem/path/compare/strings.cc: Only compare
	sign of results.

2019-01-22  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/88740
	* testsuite/util/testsuite_hooks.h [stderr] (VERIFY): Use fprintf to
	write to stderr instead of using printf.

2019-01-21  Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/86590
	* include/bits/char_traits.h (__constant_string_p,
	__constant_char_array_p): Use __builtin_is_constant_evaluated if
	available.

2019-01-20  Ulrich Drepper  <drepper@redhat.com>

	Implement C++20 P0600r1.
	* include/backward/hash_map: Add nodiscard attribute to empty.
	* include/backward/hash_set: Likewise.
	* backward/hashtable.h: Likewise.
	* include/bits/basic_string.h: Likewise.
	* include/bits/forward_list.h: Likewise.
	* include/bits/hashtable.h: Likewise.
	* include/bits/regex.h: Likewise.
	* include/bits/stl_deque.h: Likewise.
	* include/bits/stl_list.h: Likewise.
	* include/bits/stl_map.h: Likewise.
	* include/bits/stl_multimap.h: Likewise.
	* include/bits/stl_multiset.h: Likewise.
	* include/bits/stl_queue.h: Likewise.
	* include/bits/stl_set.h: Likewise.
	* include/bits/stl_stack.h: Likewise.
	* include/bits/stl_tree.h: Likewise.
	* include/bits/stl_vector.h: Likewise.
	* include/bits/unordered_map.h: Likewise.
	* include/bits/unordered_set.h: Likewise.
	* include/debug/array: Likewise.
	* include/experimental/any: Likewise.
	* include/experimental/bits/fs_path.h: Likewise.
	* include/experimental/internet: Likewise.
	* include/experimental/string_view: Likewise.
	* include/ext/pb_ds/detail/bin_search_tree_/info_fn_imps.hpp:
	Likewise.
	* include/ext/pb_ds/detail/binary_heap_/binary_heap_.hpp:
	Likewise.
	* include/ext/pb_ds/detail/binary_heap_/info_fn_imps.hpp:
	Likewise.
	* include/ext/pb_ds/detail/cc_hash_table_map_/cc_ht_map_.hpp:
	Likewise.
	* include/ext/pb_ds/detail/cc_hash_table_map_/info_fn_imps.hpp:
	Likewise.
	* include/ext/pb_ds/detail/cc_hash_table_map_/size_fn_imps.hpp:
	Likewise.
	* include/ext/pb_ds/detail/gp_hash_table_map_/gp_ht_map_.hpp:
	Likewise.
	* include/ext/pb_ds/detail/gp_hash_table_map_/info_fn_imps.hpp:
	Likewise.
	* include/ext/pb_ds/detail/left_child_next_sibling_heap_/
	info_fn_imps.hpp: Likewise.
	* include/ext/pb_ds/detail/left_child_next_sibling_heap_/
	left_child_next_sibling_heap_.hpp: Likewise.
	* include/ext/pb_ds/detail/list_update_map_/info_fn_imps.hpp:
	Likewise.
	* include/ext/pb_ds/detail/list_update_map_/lu_map_.hpp:
	Likewise.
	* include/ext/pb_ds/detail/ov_tree_map_/info_fn_imps.hpp:
	Likewise.
	* include/ext/pb_ds/detail/ov_tree_map_/ov_tree_map_.hp:
	Likewise.
	* include/ext/pb_ds/detail/pat_trie_/info_fn_imps.hpp:
	Likewise.
	* include/ext/pb_ds/detail/pat_trie_/pat_trie_.hpp:
	Likewise.
	* include/ext/pb_ds/detail/rc_binomial_heap_/rc.hpp:
	Likewise.
	* include/ext/pb_ds/detail/tree_trace_base.hpp: Likewise.
	* include/ext/pb_ds/trie_policy.hpp: Likewise.
	* include/ext/rope: Likewise.
	* include/ext/slist: Likewise.
	* include/ext/vstring.h: Likewise.
	* include/profile/array: Likewise.
	* include/std/array: Likewise.
	* include/tr1/array: Likewise.
	* include/tr1/hashtable.h: Likewise.
	* include/tr1/regex: Likewise.
	* include/tr2/dynamic_bitset: Likewise.
	* include/bits/alloc_traits.h: Add nodiscard attribute to
	allocate.
	* include/experimental/memory_resource: Likewise.
	* include/ext/alloc_traits.h: Likewise.
	* include/ext/array_allocator.h: Likewise.
	* include/ext/bitmap_allocator.h: Likewise.
	* include/ext/debug_allocator.h: Likewise.
	* include/ext/extptr_allocator.h: Likewise.
	* include/ext/mt_allocator.h: Likewise.
	* include/ext/new_allocator.h: Likewise.
	* include/ext/pool_allocator.h: Likewise.
	* include/ext/throw_allocator.h: Likewise.
	* include/std/scoped_allocator: Likewise.
	* libsupc++/eh_alloc.cc: Likewise.
	* include/std/future: Add nodiscard attribute to async.
	* libsupc++/new: Add nodiscard attribute to new.

2019-01-18  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/87514
	PR libstdc++/87520
	PR libstdc++/88782
	* config/abi/pre/gnu.ver (GLIBCXX_3.4.26): Export new symbol.
	* include/bits/shared_ptr.h
	(shared_ptr(_Sp_make_shared_tag, const Alloc&, Args&&...))
	(allocate_shared): Change to use new tag type.
	* include/bits/shared_ptr_base.h (_Sp_make_shared_tag::_S_eq):
	Declare new member function.
	(_Sp_alloc_shared_tag): Define new type.
	(_Sp_counted_ptr_inplace): Declare __shared_count<_Lp> as a friend.
	(_Sp_counted_ptr_inplace::_M_get_deleter) [!__cpp_rtti]: Use
	_Sp_make_shared_tag::_S_eq to check type_info.
	(__shared_count(Ptr, Deleter),__shared_count(Ptr, Deleter, Alloc)):
	Constrain to prevent being called with _Sp_alloc_shared_tag.
	(__shared_count(_Sp_make_shared_tag, const _Alloc&, Args&&...)):
	Replace constructor with ...
	(__shared_count(Tp*&, _Sp_alloc_shared_tag<_Alloc>, Args&&...)): Use
	reference parameter so address of the new object can be returned to
	the caller. Obtain the allocator from the tag type.
	(__shared_ptr(_Sp_make_shared_tag, const Alloc&, Args&&...)): Replace
	constructor with ...
	(__shared_ptr(_Sp_alloc_shared_tag<Alloc>, Args&&...)): Pass _M_ptr
	to the __shared_count constructor.
	(__allocate_shared): Change to use new tag type.
	* src/c++11/shared_ptr.cc (_Sp_make_shared_tag::_S_eq): Define.

2019-01-17  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++17/fs_ops.cc
	(equivalent(const path&, const path&, error_code&))
	[_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Use GetFileInformationByHandle to
	compare files instead of relying on incomplete info returned by stat.

	PR libstdc++/88884
	* src/c++17/fs_ops.cc (absolute(const path&, error_code&)): Do nothing
	if the path is already absolute.
	[_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Normalize root-directory.
	[!_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Pass error_code to current_path.

	PR libstdc++/88881
	* src/c++17/fs_ops.cc (canonical(const path&, error_code&))
	[_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Normalize path, to match behaviour
	of filesystem::exists.
	(create_directories(const path&, error_code&)): Add assertions.
	(status(const path&, error_code&)) [_GLIBCXX_FILESYSTEM_IS_WINDOWS]:
	Add workaround for bug in _wstat for paths with trailing slash.
	* testsuite/27_io/filesystem/operations/create_directories.cc: Adjust
	for expected behaviour on mingw.
	* testsuite/experimental/filesystem/operations/create_directories.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/temp_directory_path.cc: Use
	"TMP" instead of "TMPDIR" and clean environment before each test. Do
	not test permissions on mingw targets.

2019-01-16  Jonathan Wakely  <jwakely@redhat.com>

	* config/abi/pre/gnu.ver (GLIBCXX_3.4.26): Add exports for fstream
	constructors and open members taking wide strings. Fix patterns for
	filesystem::path members to match wstring_view parameters. Add
	exports for shared_ptr members used by directory iterators.
	* src/c++17/fs_ops.cc (remove(const path&, error_code&)): Clear the
	error code parameter if the file doesn't exist.
	* src/filesystem/ops.cc (remove(const path&, error_code&)):
	Likewise.
	* testsuite/27_io/filesystem/operations/canonical.cc: Fix expected
	values for mingw targets, where "/" is not an absolute path. Do not
	test symlinks on mingw targets.
	* testsuite/experimental/filesystem/operations/canonical.cc: Likewise.
	* testsuite/27_io/filesystem/operations/copy.cc: Do not test symlinks
	on mingw targets.
	* testsuite/experimental/filesystem/operations/copy.cc: Likewise.
	* testsuite/27_io/filesystem/operations/create_directories.cc: Check
	that each component of the path is created.
	* testsuite/experimental/filesystem/operations/create_directories.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/exists.cc: Do not test
	permissions on mingw targets.
	* testsuite/experimental/filesystem/operations/exists.cc: Likewise.
	* testsuite/27_io/filesystem/operations/is_empty.cc: Likewise.
	* testsuite/experimental/filesystem/operations/is_empty.cc: Likewise.
	* testsuite/27_io/filesystem/operations/permissions.cc: XFAIL for
	mingw targets.
	* testsuite/experimental/filesystem/operations/permissions.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/remove.cc: Do not test
	symlinks or permissions on mingw targets.
	* testsuite/experimental/filesystem/operations/remove.cc: Likewise.
	* testsuite/27_io/filesystem/operations/remove_all.cc: Do not test
	symlinks on mingw targets.
	* testsuite/experimental/filesystem/operations/remove_all.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/status.cc: Do not test
	permissions on mingw targets.
	* testsuite/27_io/filesystem/operations/weakly_canonical.cc: Do not
	test symlinks on mingw targets.
	* testsuite/experimental/filesystem/operations/space.cc: Fix test
	for mingw targets.

2019-02-14  Ulrich Drepper  <drepper@redhat.com>

	PR libstdc++/88738
	Warn about unused comparisons of shared_ptr/unique_ptr
	* include/bits/c++config [_GLIBCXX_NODISCARD]: Define.
	* include/bits/shared_ptr.h: Use it for operator ==, !=,
	<, <=, >, >= for shared_ptr.
	* include/bits/unique_ptr.h: Likewise for unique_ptr.

2019-01-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/shared_ptr_base.h (__cpp_lib_shared_ptr_arrays): Define
	as 201611L, because P0497R0 changes are supported.
	* include/std/version (__cpp_lib_shared_ptr_arrays): Likewise.

	* include/bits/erase_if.h [__cplusplus > 201703L]
	(__cpp_lib_erase_if): Only define for C++2a.
	* include/std/iterator [__cplusplus >= 201402L && !_GLIBCXX_DEBUG]
	(__cpp_lib_null_iterators): Define.
	* include/std/version [__cplusplus >= 201402L && !_GLIBCXX_DEBUG]
	(__cpp_lib_null_iterators): Define.
	[__cpp_impl_destroying_delete] (__cpp_lib_destroying_delete): Define.

	* doc/xml/manual/status_cxx2017.xml: Document P0032R3 and P0307R2
	status.
	* include/bits/stl_uninitialized.h (__cpp_lib_raw_memory_algorithms):
	Define.
	* include/std/any (__cpp_lib_any): Define as 201606L, because P0032R3
	changes are supported.
	* include/std/optional (__cpp_lib_optional): Likewise.
	* include/std/variant (__cpp_lib_variant): Likewise.
	* include/std/version [!__STRICT_ANSI__]
	(__cpp_lib_uncaught_exceptions): Define as long integer.
	[__cplusplus >= 201703L] (__cpp_lib_any)
	(__cpp_lib_raw_memory_algorithms, __cpp_lib_uncaught_exceptions)
	(__cpp_lib_variant): Define for C++17.
	[__cplusplus >= 201703L] (__cpp_lib_optional): Update value and define
	as long integer.
	* libsupc++/exception (__cpp_lib_uncaught_exceptions): Define as long
	integer.

	* doc/xml/manual/status_cxx2020.xml: Update P1123R0 status.

2019-01-12  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/88811
	PR libstdc++/83306
	* src/filesystem/path.cc: Fix typo. If first path is empty, show []
	before second path.
	* testsuite/experimental/filesystem/filesystem_error/cons.cc: New
	test.

2019-01-11  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/intro.xml: Include new section.
	* doc/xml/manual/status_cxx2017.xml: Document more
	implementation-defined properties of the library.
	* doc/xml/manual/status_cxx2020.xml: Document C++2a status.
	* doc/html/*: Regenerate.

	* include/bits/refwrap.h [__cplusplus > 201703L]
	(_Refwrap_base_arg1, _Refwrap_base_arg2, _Reference_wrapper_base)
	(_Reference_wrapper_base_memfun): Do not define for C++2a.
	(reference_wrapper): Do not derive from _Reference_wrapper_base_memfun
	for C++2a.
	(reference_wrapper::operator()): Add static assertion.
	* testsuite/20_util/reference_wrapper/incomplete.cc: New test.

	* include/std/chrono (duration_values::zero(), duration_values::min())
	(duration_values::max()): Add noexcept.
	(duration::zero(), duration::min(), duration::max()): Likewise.
	(time_point::zero(), time_point::min(), time_point::max()): Likewise.
	* testsuite/20_util/duration/requirements/noexcept.cc: New test.
	* testsuite/20_util/time_point/requirements/noexcept.cc: New test.

	* include/std/version (__cpp_lib_erase_if): Move to C++20 group.

2019-01-11  Jakub Jelinek  <jakub@redhat.com>

	* include/std/type_traits (__cpp_lib_is_constant_evaluated): Define.
	* include/std/version (__cpp_lib_is_constant_evaluated): Define.

2019-01-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/88802
	* include/bits/functional_hash.h (hash<nullptr_t>): Define
	specialization for C++17 (P0513R0, LWG 2817).
	* testsuite/20_util/hash/nullptr.cc: New test.

	PR libstdc++/88125
	* config/abi/pre/gnu.ver (GLIBCXX_3.4.6): Remove unused duplicate
	pattern for std::basic_stringbuf::str().

	* config/abi/pre/gnu.ver (GLIBCXX_3.4): Correct recent changes to
	basic_ostream::operator<< patterns.

2019-01-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/filesystem/operations/last_write_time.cc: Fix
	test failures on targets with 32-bit time_t.

	* include/bits/erase_if.h: Define __cpp_lib_erase_if.
	* include/std/deque: Likewise.
	* include/std/forward_list: Likewise.
	* include/std/list: Likewise.
	* include/std/string: Likewise.
	* include/std/vector: Likewise.
	* include/std/version: Likewise.
	* testsuite/21_strings/basic_string/erasure.cc: Test macro.
	* testsuite/23_containers/deque/erasure.cc: Likewise.
	* testsuite/23_containers/forward_list/erasure.cc: Likewise.
	* testsuite/23_containers/list/erasure.cc: Likewise.
	* testsuite/23_containers/map/erasure.cc: Likewise.
	* testsuite/23_containers/set/erasure.cc: Likewise.
	* testsuite/23_containers/unordered_map/erasure.cc: Likewise.
	* testsuite/23_containers/unordered_set/erasure.cc: Likewise.
	* testsuite/23_containers/vector/erasure.cc: Likewise.

	* include/experimental/internet [AI_NUMERICSERV]
	(resolver_base::numeric_service): Define conditionally.
	* testsuite/experimental/net/internet/resolver/base.cc: Test it
	conditionally.
	* testsuite/experimental/net/internet/resolver/ops/lookup.cc:
	Likewise.

2019-01-10  Ville Voutilainen  <ville.voutilainen@gmail.com>
	    Jonathan Wakely  <jwakely@redhat.com>

	Implement LWG 2221
	* config/abi/pre/gnu.ver (GLIBCXX_3.4): Tighten patterns.
	(GLIBCXX_3.4.26): Add new exports.
	* include/Makefile.am: Add ostream-inst.cc. Move string-inst.cc to
	correct list of sources.
	* include/Makefile.in: Regenerate.
	* include/std/ostream (operator<<(nullptr_t)): New member function.
	* src/c++17/ostream-inst.cc: New file.
	* testsuite/27_io/basic_ostream/inserters_other/char/lwg2221.cc: New
	test.

2019-01-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/util/testsuite_fs.h (nonexistent_path): Include name
	of the source file containing the caller.
	* testsuite/27_io/filesystem/iterators/directory_iterator.cc: Remove
	directories created by test.
	* testsuite/27_io/filesystem/iterators/recursive_directory_iterator.cc:
	Likewise.
	* testsuite/experimental/filesystem/iterators/directory_iterator.cc:
	Likewise.
	* testsuite/experimental/filesystem/iterators/
	recursive_directory_iterator.cc: Likewise.

2019-01-10  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/88775
	* include/bits/stl_function.h (greater<_Tp*>::operator(),
	less<_Tp*>::operator(), greater_equal<_Tp*>::operator(),
	less_equal<_Tp*>::operator()): Use __builtin_is_constant_evaluated
	instead of __builtin_constant_p if available.  Don't bother with
	the pointer comparison in C++11 and earlier.

2019-01-09  Sandra Loosemore  <sandra@codesourcery.com>

	PR other/16615

	* include/ext/bitmap_allocator.h: Mechanically replace "can not"
	with "cannot".

2019-01-09  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/libstdc++-prettyprinters/cxx17.cc: Fix expected output
	for filesystem::path. Give variables more distinctive names.

	* include/std/optional (_Optional_payload_base::_M_copy_assign): New
	member function to perform non-trivial assignment.
	(_Optional_payload_base::_M_move_assign): Likewise.
	(_Optional_payload<T, true, false, true>::operator=)
	(_Optional_payload<T, true, true, false>::operator=)
	(_Optional_payload<T, true, false, false>::operator=): Call
	_M_copy_assign and/or _M_move_assign to do non-trivial assignments.

	PR libstdc++/88204
	* testsuite/26_numerics/complex/operators/more_constexpr.cc: Do not
	test std::complex<long double> if long double format is IBM128.
	* testsuite/26_numerics/complex/requirements/more_constexpr.cc:
	Likewise.

2019-01-08  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/libstdc++-prettyprinters/compat.cc: Test printer support
	for old std::unique_ptr layout.
	* testsuite/libstdc++-prettyprinters/cxx17.cc: Fix std::variant test
	to become valueless. Add filesystem::path tests.

	PR libstdc++/87855
	* include/std/optional (_Optional_payload_base): New class template
	for common code hoisted from _Optional_payload specializations. Use
	a template for the union, to allow a partial specialization for
	types with non-trivial destructors. Add constructors for in-place
	initialization to the union.
	(_Optional_payload(bool, const _Optional_payload&)): Use _M_construct
	to perform non-trivial copy construction, instead of relying on
	non-standard copy elision in a delegating constructor.
	(_Optional_payload(bool, _Optional_payload&&)): Likewise for
	non-trivial move construction.
	(_Optional_payload): Derive from _Optional_payload_base and use it
	for everything except the non-trivial assignment operators, which are
	defined as needed.
	(_Optional_payload<false, C, M>): Derive from the specialization
	_Optional_payload<true, false, false> and add a destructor.
	(_Optional_base_impl::_M_destruct, _Optional_base_impl::_M_reset):
	Forward to corresponding members of _Optional_payload.
	(_Optional_base_impl::_M_is_engaged, _Optional_base_impl::_M_get):
	Hoist common members from _Optional_base.
	(_Optional_base): Make all members and base class public.
	(_Optional_base::_M_get, _Optional_base::_M_is_engaged): Move to
	_Optional_base_impl.
	* python/libstdcxx/v6/printers.py (StdExpOptionalPrinter): Add
	support for new std::optional layout.
	* testsuite/libstdc++-prettyprinters/compat.cc: New test.

	PR libstdc++/88066
	* include/bits/locale_conv.h: Use <> for includes not "".
	* include/ext/random: Likewise.
	* include/ext/vstring.h: Likewise.

2019-01-08  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* config/abi/pre/gnu.ver (GLIBCXX_3.4): Tighten existing patterns.
	(GLIBCXX_3.4.21): Likewise.

2019-01-08  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/88749
	* src/filesystem/ops.cc (last_write_time): Fix preprocessor condition
	to match the one that controls whether utimbuf and utime are declared.

2019-01-07  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/87787
	* include/bits/char_traits.h (char_traits::move): Do not pass null
	pointers to memmove.
	* include/bits/locale_facets.h
	(ctype<char>::widen(const char*, const char*, char*)): Do not
	pass null pointers to memcpy.
	(ctype<char>::narrow(const char*, const char*, char, char*)):
	Likewise.
	(ctype<char>::do_widen(const char*, const char*, char*)):
	Likewise.
	(ctype<char>::do_narrow(const char*, const char*, char, char*)):
	Likewise.

	* doc/xml/manual/spine.xml: Update copyright years.
	* doc/xml/manual/status_cxx2017.xml: Adjust note about -lstdc++fs.
	* doc/xml/manual/using.xml: Remove requirement to link with -lstdc++fs
	for C++17 filesystem library.
	* doc/html/*: Regenerate.

	* acinclude.m4 (GLIBCXX_CHECK_FILESYSTEM_DEPS): Check for truncate.
	* config.h.in: Regenerate.
	* config/abi/pre/gnu.ver: Order patterns for filesystem operations
	alphabetically and add missing entries for copy_symlink,
	hard_link_count, rename, and resize_file.
	* configure: Regenerate.
	* src/c++17/fs_ops.cc (resize_file): Remove #if so posix::truncate is
	used unconditionally.
	* src/filesystem/ops-common.h (__gnu_posix::truncate)
	[!_GLIBCXX_HAVE_TRUNCATE]: Provide fallback definition that only
	supports truncating to zero length.
	* testsuite/27_io/filesystem/operations/all.cc: New test.
	* testsuite/27_io/filesystem/operations/resize_file.cc: New test.

2019-01-06  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/86756
	* acinclude.m4 (GLIBCXX_CHECK_FILESYSTEM_DEPS): Check for utime and
	lstat and define _GLIBCXX_USE_UTIME and _GLIBCXX_USE_LSTAT.
	* config.h.in: Regenerate.
	* config/abi/pre/gnu.ver (GLIBCXX_3.4.26): Export symbols for
	remaining std::filesystem types and functions.
	* configure: Regenerate.
	* src/c++17/Makefile.am: Add C++17 filesystem sources.
	* src/c++17/Makefile.in: Regenerate.
	* src/c++17/cow-fs_dir.cc: Move src/filesystem/cow-std-dir.cc to
	here, and change name of included file.
	* src/c++17/cow-fs_ops.cc: Move src/filesystem/cow-std-ops.cc to
	here, and change name of included file.
	* src/c++17/fs_dir.cc: Move src/filesystem/std-dir.cc to here. Change
	path to dir-common.h.
	* src/c++17/fs_ops.cc: Move src/filesystem/std-ops.cc to here. Change
	path to ops-common.h. Disable -Wunused-parameter warnings.
	(internal_file_clock): Define unconditionally.
	[!_GLIBCXX_HAVE_SYS_STAT_H] (internal_file_clock::from_stat): Do not
	define.
	(do_copy_file, do_space): Move definitions to ops.common.h.
	(copy, file_size, hard_link_count, last_write_time, space): Only
	perform operation when _GLIBCXX_HAVE_SYS_STAT_H is defined, otherwise
	report an error.
	(last_write_time, read_symlink): Remove unused attributes from
	parameters.
	* src/filesystem/Makefile.am: Remove C++17 filesystem sources.
	* src/filesystem/Makefile.in: Regenerate.
	* src/filesystem/cow-std-dir.cc: Move to src/c++17/cow-fs_dir.cc.
	* src/filesystem/cow-std-ops.cc: Move to src/c++17/cow-fs_ops.cc.
	* src/filesystem/std-dir.cc: Move to src/c++17/fs_dir.cc.
	* src/filesystem/std-ops.cc: Move to src/c++17/fs_ops.cc.
	* src/filesystem/dir-common.h [!_GLIBCXX_HAVE_DIRENT_H]: Define
	dummy types and functions instead of using #error.
	* src/filesystem/dir.cc [!_GLIBCXX_HAVE_DIRENT_H]: Use #error.
	* src/filesystem/ops-common.h [!_GLIBCXX_USE_LSTAT] (lstat): Define
	in terms of stat.
	[!_GLIBCXX_HAVE_UNISTD_H]: Define dummy types and functions.
	(do_copy_file, do_space): Move definitions here from std-ops.cc.
	* src/filesystem/ops.cc: Adjust calls to do_copy_file and do_space
	to account for new namespace.
	* testsuite/27_io/filesystem/directory_entry/86597.cc: Remove
	-lstdc++fs from dg-options.
	* testsuite/27_io/filesystem/directory_entry/lwg3171.cc: Likewise.
	* testsuite/27_io/filesystem/file_status/1.cc: Likewise.
	* testsuite/27_io/filesystem/filesystem_error/cons.cc: Likewise.
	* testsuite/27_io/filesystem/filesystem_error/copy.cc: Likewise.
	* testsuite/27_io/filesystem/iterators/directory_iterator.cc:
	Likewise.
	* testsuite/27_io/filesystem/iterators/pop.cc: Likewise.
	* testsuite/27_io/filesystem/iterators/recursive_directory_iterator.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/absolute.cc: Likewise.
	* testsuite/27_io/filesystem/operations/canonical.cc: Likewise.
	* testsuite/27_io/filesystem/operations/copy.cc: Likewise.
	* testsuite/27_io/filesystem/operations/copy_file.cc: Likewise.
	* testsuite/27_io/filesystem/operations/create_directories.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/create_directory.cc: Likewise.
	* testsuite/27_io/filesystem/operations/create_symlink.cc: Likewise.
	* testsuite/27_io/filesystem/operations/current_path.cc: Likewise.
	* testsuite/27_io/filesystem/operations/equivalent.cc: Likewise.
	* testsuite/27_io/filesystem/operations/exists.cc: Likewise.
	* testsuite/27_io/filesystem/operations/file_size.cc: Likewise.
	* testsuite/27_io/filesystem/operations/is_empty.cc: Likewise.
	* testsuite/27_io/filesystem/operations/last_write_time.cc: Likewise.
	* testsuite/27_io/filesystem/operations/permissions.cc: Likewise.
	* testsuite/27_io/filesystem/operations/proximate.cc: Likewise.
	* testsuite/27_io/filesystem/operations/read_symlink.cc: Likewise.
	* testsuite/27_io/filesystem/operations/relative.cc: Likewise.
	* testsuite/27_io/filesystem/operations/remove.cc: Likewise.
	* testsuite/27_io/filesystem/operations/remove_all.cc: Likewise.
	* testsuite/27_io/filesystem/operations/space.cc: Likewise.
	* testsuite/27_io/filesystem/operations/status.cc: Likewise.
	* testsuite/27_io/filesystem/operations/symlink_status.cc: Likewise.
	* testsuite/27_io/filesystem/operations/temp_directory_path.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/weakly_canonical.cc: Likewise.


	PR libstdc++/86756
	* config/abi/pre/gnu.ver (GLIBCXX_3.4): Make various patterns for
	typeinfo and vtables less greedy.
	(GLIBCXX_3.4.26): Export symbols for std::filesystem::path.
	* src/c++17/Makefile.am: Add fs_path.cc and cow-fs_path.cc.
	* src/c++17/Makefile.in: Regenerate.
	* src/c++17/cow-fs_path.cc: Move src/filesystem/cow-std-path.cc to
	here, and change name of included file.
	* src/c++17/fs_path.cc: Move src/filesystem/std-path.cc to here.
	* src/filesystem/Makefile.am: Remove std-path.cc and cow-std-path.cc
	from sources.
	* src/filesystem/Makefile.in: Regenerate.
	* src/filesystem/cow-std-path.cc: Move to src/c++17/cow-fs_path.cc.
	* src/filesystem/std-path.cc: Move to src/c++17/fs_path.cc.
	* testsuite/27_io/filesystem/path/append/path.cc: Remove -lstdc++fs
	from dg-options and remove dg-require-filesystem-ts.
	* testsuite/27_io/filesystem/path/append/source.cc: Likewise.
	* testsuite/27_io/filesystem/path/assign/assign.cc: Likewise.
	* testsuite/27_io/filesystem/path/assign/copy.cc: Likewise.
	* testsuite/27_io/filesystem/path/compare/compare.cc: Likewise.
	* testsuite/27_io/filesystem/path/compare/lwg2936.cc: Likewise.
	* testsuite/27_io/filesystem/path/compare/path.cc: Likewise.
	* testsuite/27_io/filesystem/path/compare/strings.cc: Likewise.
	* testsuite/27_io/filesystem/path/concat/path.cc: Likewise.
	* testsuite/27_io/filesystem/path/concat/strings.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/80762.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/copy.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/default.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/format.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/locale.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/range.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/string_view.cc: Likewise.
	* testsuite/27_io/filesystem/path/decompose/extension.cc: Likewise.
	* testsuite/27_io/filesystem/path/decompose/filename.cc: Likewise.
	* testsuite/27_io/filesystem/path/decompose/parent_path.cc: Likewise.
	* testsuite/27_io/filesystem/path/decompose/relative_path.cc: Likewise.
	* testsuite/27_io/filesystem/path/decompose/root_directory.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/decompose/root_name.cc: Likewise.
	* testsuite/27_io/filesystem/path/decompose/root_path.cc: Likewise.
	* testsuite/27_io/filesystem/path/decompose/stem.cc: Likewise.
	* testsuite/27_io/filesystem/path/generation/normal.cc: Likewise.
	* testsuite/27_io/filesystem/path/generation/normal2.cc: Likewise.
	* testsuite/27_io/filesystem/path/generation/proximate.cc: Likewise.
	* testsuite/27_io/filesystem/path/generation/relative.cc: Likewise.
	* testsuite/27_io/filesystem/path/generic/generic_string.cc: Likewise.
	* testsuite/27_io/filesystem/path/itr/components.cc: Likewise.
	* testsuite/27_io/filesystem/path/itr/traversal.cc: Likewise.
	* testsuite/27_io/filesystem/path/modifiers/clear.cc: Likewise.
	* testsuite/27_io/filesystem/path/modifiers/make_preferred.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/modifiers/remove_filename.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/modifiers/replace_extension.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/modifiers/replace_filename.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/modifiers/swap.cc: Likewise.
	* testsuite/27_io/filesystem/path/native/string.cc: Likewise.
	* testsuite/27_io/filesystem/path/nonmember/append.cc: Likewise.
	* testsuite/27_io/filesystem/path/nonmember/hash_value.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/empty.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/has_extension.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/has_filename.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/has_parent_path.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/has_relative_path.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/has_root_directory.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/has_root_name.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/has_root_path.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/has_stem.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/is_absolute.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/is_relative.cc: Likewise.

	PR libstdc++/87431
	* include/std/variant (_Variant_storage<true, _Types...>::_M_valid):
	Check is_trivially_copyable instead of is_scalar.
	(variant::emplace<N, Args>(Args&&...)): If construction of the new
	contained value can throw and its type is trivially copyable then
	construct into a temporary variant and move from it, to provide the
	strong exception safety guarantee.
	(variant::emplace<N, U, Args>(initializer_list<U>, Args&&...)):
	Likewise.
	* testsuite/20_util/variant/87431.cc: New test.
	* testsuite/20_util/variant/run.cc: Adjust test so that throwing
	conversion causes valueless state.

	PR libstdc++/88607
	* testsuite/17_intro/headers/c++1998/charset.cc: New test.
	* testsuite/17_intro/headers/c++2011/charset.cc: New test.
	* testsuite/17_intro/headers/c++2014/charset.cc: New test.
	* testsuite/17_intro/headers/c++2017/charset.cc: New test.
	* testsuite/17_intro/headers/c++2020/charset.cc: New test.

2019-01-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/fs_fwd.h (__file_clock): Define new clock.
	(file_time_type): Redefine in terms of __file_clock.
	* src/filesystem/ops-common.h (file_time): Add FIXME comment about
	overflow.
	* src/filesystem/std-ops.cc (is_set(perm_options, perm_options)): Give
	internal linkage.
	(internal_file_lock): New helper type for accessing __file_clock.
	(do_copy_file): Use internal_file_lock to convert system time to
	file_time_type.
	(last_write_time(const path&, error_code&)): Likewise.
	(last_write_time(const path&, file_time_type, error_code&)): Likewise.

2019-01-04  Jonathan Wakely  <jwakely@redhat.com>

	* config/abi/pre/gnu.ver (GLIBCXX_3.4.21): Make patterns less greedy
	for const member functions of std::basic_string.
	(GLIBCXX_3.4.26): Export member functions of std::basic_string added
	in C++17.
	* include/bits/basic_string.h (basic_string(__sv_wrapper, const A&)):
	Make non-standard constructor private.
	[!_GLIBCXX_USE_CXX11_ABI] (basic_string(__sv_wrapper, const A&)):
	Likewise.
	* include/bits/basic_string.tcc (std::string, std::wstring): Declare
	explicit instantiations for C++17 as well as earlier dialects.
	* src/c++17/Makefile.am: Add new source files.
	* src/c++17/Makefile.in: Regenerate.
	* src/c++17/cow-string-inst.cc: New file defining explicit
	instantiations for basic_string member functions added in C++17.
	* src/c++17/string-inst.cc: Likewise.

	* config/abi/pre/gnu.ver (GLIBCXX_3.4.26): Export allocator-extended
	copy/move constructors for old std::basic_string.
	* include/bits/basic_string.h [!_GLIBCXX_USE_CXX11_ABI]
	(basic_string::reference, basic_string::const_reference): Define
	as plain references for C++11 and later.
	(basic_string::basic_string()): Put constructor body outside
	preprocessor conditional groups.
	(basic_string::basic_string(basic_string&&)): Move _Alloc_hider
	instead of copying it.
	(basic_string::basic_string(const basic_string&, const _Alloc&)):
	Define.
	(basic_string::basic_string(basic_string&&, const _Alloc&)):
	Define.
	* include/bits/fs_path.h [!_GLIBCXX_USE_CXX11_ABI]: Remove special
	cases for old basic_string.
	* testsuite/21_strings/basic_string/cons/char/8.cc: Test
	allocator-extended constructors unconditionally. Add extra members to
	allocator type when using old string ABI.
	* testsuite/21_strings/basic_string/allocator/71964.cc: Enable test
	for old string ABI.
	* testsuite/21_strings/basic_string/cons/wchar_t/8.cc: Likewise.

	* testsuite/23_containers/list/61347.cc: Avoid spurious failure when
	-fno-inline added to test flags.

	* testsuite/21_strings/basic_string/requirements/
	explicit_instantiation/debug.cc: Remove XFAIL for old ABI.

	* testsuite/27_io/filesystem/filesystem_error/copy.cc: Fix static
	assertion failures with old std::string ABI.

	* include/bits/fs_path.h (path::_List::erase): Replace both overloads
	with ...
	(path::pop_back(), path::_M_erase_from(const_iterator)): New member
	functions that will only erase elements at the end.
	* src/filesystem/std-path.cc (path::_List::_Impl::pop_back()): Define.
	(path::_List::_Impl::_M_erase_from(const_iterator)): Define.
	(path::_List::operator=(const _List&)): Use _M_erase_from(p) instead
	of erase(p, end()).
	(path::_List::pop_back()): Define.
	(path::_List::_M_erase_from(const_iterator)): Define.
	(path::operator/=(const path&)): Use pop_back to remove last component
	and _M_erase_from to remove multiple components.
	(path::_M_append(basic_string_view<value_type>)): Likewise.
	(path::operator+=(const path&)): Likewise.
	(path::_M_concat(basic_string_view<value_type>)): Likewise.
	(path::remove_filename()): Likewise.
	(path::lexically_normal()): Use _List::_Impl iterators instead of
	path::iterator. Use pop_back to remove components from the end. Clear
	trailing filename, instead of using erase(const_iterator) to remove
	a non-final component.
	* testsuite/27_io/filesystem/path/generation/normal.cc: Test
	additional cases.
	* testsuite/27_io/filesystem/path/generation/normal2.cc: New test.

	* src/filesystem/std-path.cc (path::operator+=(const path&)): Fix
	incorrect treatment of empty filename after trailing slash.
	* testsuite/27_io/filesystem/path/concat/path.cc: Test problem case.

	* testsuite/21_strings/basic_string/modifiers/assign/char/
	move_assign_optim.cc: Avoid spurious failure when -fno-inline added
	to test flags.
	* testsuite/21_strings/basic_string/modifiers/assign/wchar_t/
	move_assign_optim.cc: Likewise.

2019-01-03  Jonathan Wakely  <jwakely@redhat.com>
	    Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/88607
	* include/experimental/memory: Replace UTF-8 quote characters.
	* include/std/future: Replace UTF-8 "em dash" characters.

2019-01-03  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/88607
	* include/bits/forward_list.h: Replace UTF-8 "ligature fi" character.
	* include/debug/forward_list: Likewise.
	* include/experimental/bits/shared_ptr.h: Remove UTF-8 "section sign"
	character.
	* include/experimental/chrono: Likewise.
	* include/experimental/functional: Likewise.
	* include/experimental/ratio: Likewise.
	* include/experimental/system_error: Likewise.
	* include/experimental/tuple: Likewise.
	* include/experimental/type_traits: Likewise.
	* include/parallel/workstealing.h: Replace UTF-8 "en dash" character.
	* include/parallel/multiseq_selection.h: Likewise.

	PR libstdc++/88681
	* config/abi/pre/gnu.ver: Add missing exports.
	* testsuite/22_locale/collate_byname/88681.cc: New test.
	* testsuite/22_locale/time_get/get/char/88681.cc: New test.
	* testsuite/22_locale/time_get/get/wchar_t/88681.cc: New test.

2019-01-02  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/23_containers/map/cons/deduction.cc: Test deduction from
	initializer_list<value_type> and from input iterator ranges.
	* testsuite/23_containers/multimap/cons/deduction.cc: Likewise.

	* testsuite/experimental/string_view/element_access/char/empty.cc:
	Fix year range in copyright header.

2019-01-02  Joel Brobecker  <brobecker@adacore.com>

	* testsuite/21_strings/basic_string_view/element_access/char/empty.cc:
	Fix year range in copyright header.

2019-01-01  Jakub Jelinek  <jakub@redhat.com>

	Update copyright years.
\f
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