Daily bump.

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

2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/atomic: Add missing @endcond doxygen comment.

2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-11-25  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/107850
        * include/bits/erase_if.h (__erase_nodes_if): Use non-const
        reference to the container.
        * include/experimental/map (erase_if): Likewise.
        * include/experimental/set (erase_if): Likewise.
        * include/experimental/unordered_map (erase_if): Likewise.
        * include/experimental/unordered_set (erase_if): Likewise.
        * include/std/map (erase_if): Likewise.
        * include/std/set (erase_if): Likewise.
        * include/std/unordered_map (erase_if): Likewise.
        * include/std/unordered_set (erase_if): Likewise.
        * testsuite/23_containers/map/erasure.cc: Check with
        const-incorrect predicate.
        * testsuite/23_containers/set/erasure.cc: Likewise.
        * testsuite/23_containers/unordered_map/erasure.cc: Likewise.
        * testsuite/23_containers/unordered_set/erasure.cc: Likewise.
        * testsuite/experimental/map/erasure.cc: Likewise.
        * testsuite/experimental/set/erasure.cc: Likewise.
        * testsuite/experimental/unordered_map/erasure.cc: Likewise.
        * testsuite/experimental/unordered_set/erasure.cc: Likewise.

2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-11-28  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/26_numerics/random/subtract_with_carry_engine/cons/lwg3809.cc:
        Replace non-ASCII character.

2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-02-28  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/108952
        * include/bits/uses_allocator_args.h
        (uses_allocator_construction_args): Implement LWG 3527.
        * testsuite/20_util/pair/astuple/get-2.cc: New test.
        * testsuite/20_util/scoped_allocator/108952.cc: New test.
        * testsuite/20_util/uses_allocator/lwg3527.cc: New test.

2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-03-31  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/109339
        * include/std/stop_token (_Stop_state_ptr(const stop_source&)):
        Add attribute access with access-mode 'none'.
        * testsuite/30_threads/stop_token/stop_source/109339.cc: New test.

2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-11-28  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/107466
        * include/bits/random.h (subtract_with_carry_engine): Use 32-bit
        type for default seed. Use 0u as default argument for
        subtract_with_carry_engine(result_type) constructor and
        seed(result_type) member function.
        * include/bits/random.tcc (subtract_with_carry_engine): Use
        32-bit type for default seed and engine used for initial state.
        * testsuite/26_numerics/random/subtract_with_carry_engine/cons/lwg3809.cc:
        New test.

2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/mofunc_impl.h: Fix typo in doxygen comment.

2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

        * doc/doxygen/user.cfg.in (SOURCE_BROWSER): Only set to YES for
        HTML docs.
        * include/bits/gslice_array.h (_DEFINE_VALARRAY_OPERATOR): Omit
        from doxygen docs.
        * include/bits/indirect_array.h (_DEFINE_VALARRAY_OPERATOR):
        Likewise.
        * include/bits/mask_array.h (_DEFINE_VALARRAY_OPERATOR):
        Likewise.
        * include/bits/slice_array.h (_DEFINE_VALARRAY_OPERATOR):
        Likewise.
        * include/std/valarray (_DEFINE_VALARRAY_UNARY_OPERATOR)
        (_DEFINE_VALARRAY_AUGMENTED_ASSIGNMENT)
        (_DEFINE_VALARRAY_EXPR_AUGMENTED_ASSIGNMENT)
        (_DEFINE_BINARY_OPERATOR): Likewise.

2023-04-21  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/103755
        * include/bits/locale_classes.tcc (try_facet, use_facet): Do not
        check array index or dynamic type when accessing required
        specializations of std::ctype, std::num_get, or std::num_put.
        * testsuite/22_locale/ctype/is/string/89728_neg.cc: Adjust
        expected errors.

2023-04-20  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-11-29  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/107852
        PR libstdc++/106199
        PR libstdc++/100366
        * include/bits/vector.tcc (vector::_M_fill_insert): Copy
        _M_start and _M_finish members before allocating.
        (vector::_M_default_append): Likewise.
        (vector::_M_range_insert): Likewise.

2023-04-20  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-04-04  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/extensions.xml: Remove std::bad_exception from
        example program.
        * doc/html/manual/ext_demangling.html: Regenerate.

2023-04-20  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-04-05  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/regex.h (sub_match::swap): New function.
        * testsuite/28_regex/sub_match/lwg3204.cc: New test.

2023-04-20  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/103387
        * include/bits/istream.tcc (istream::_M_extract(ValueT&)): Use
        std::use_facet instead of cached _M_num_get facet.
        (istream::operator>>(short&)): Likewise.
        (istream::operator>>(int&)): Likewise.
        * include/bits/ostream.tcc (ostream::_M_insert(ValueT)): Use
        std::use_facet instead of cached _M_num_put facet.

2023-04-20  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-01-15  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/30_threads/jthread/jthread.cc: Remove -pthread from
        dg-options.

2023-04-20  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-03-22  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/shared_ptr_atomic.h (atomic::operator=(nullptr_t)):
        Add overload, as per LWG 3893.
        * testsuite/20_util/shared_ptr/atomic/atomic_shared_ptr.cc:
        Check assignment from nullptr.

2023-04-20  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-03-29  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/expected (expected::value() &): Use const lvalue
        for unex member passed to bad_expected_access constructor, as
        per LWG 3843.

2023-04-20  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-02-02  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/variant (variant::operator=): Implement resolution
        of LWG 3585.
        * testsuite/20_util/variant/lwg3585.cc: New test.

2023-04-12  Patrick Palka  <ppalka@redhat.com>

        Backported from master:
        2023-04-12  Patrick Palka  <ppalka@redhat.com>

        * src/c++17/floating_from_chars.cc: Include <algorithm>,
        <iterator>, <limits> and <cstdint>.

2023-03-30  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-03-29  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/109242
        * include/std/optional (transform): Use std::remove_cv_t.
        * testsuite/20_util/optional/monadic/pr109242.cc: New test.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-12-16  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/108118
        * include/bits/shared_ptr_base.h (weak_ptr::operator=):
        Implement as move-and-swap exactly as specified in the standard.
        * testsuite/20_util/weak_ptr/cons/self_move.cc: New test.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-11-03  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/ranges_algobase.h (__detail::__copy_or_move):
        Move output iterator.
        * testsuite/25_algorithms/copy/constrained.cc: Check copying to
        move-only output iterator.

2023-03-28  Björn Schäpers  <bjoern@hazardy.de>

        Backported from master:
        2023-01-14  Björn Schäpers  <bjoern@hazardy.de>

        * include/std/stacktrace (stacktrace_entry::_S_demangle): Use
        raw __name if __cxa_demangle could not demangle it.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-12-12  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/stacktrace (operator<<): Only output to narrow
        ostreams (LWG 3515).
        * testsuite/19_diagnostics/stacktrace/synopsis.cc:

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-12-09  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/chrono.h (duration_cast, floor, round, abs, ceil)
        (time_point_cast): Add [[nodiscard]] attribute and doxygen
        comments.
        (treat_as_floating_point): Add doxygen commen.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-12-09  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/chrono.h (duration, time_point): Change 'struct'
        to 'class'.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-01-26  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/108554
        * include/bits/stl_tree.h (_Rb_tree_insert_and_rebalance): Add
        nonnull attribute.
        (_Rb_tree_rebalance_for_erase): Add nonnull and returns_nonnull
        attributes.
        * testsuite/23_containers/map/modifiers/108554.cc: New test.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-09-23  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/bitset (bitset::_M_copy_to_string): Find set bits
        instead of iterating over individual bits.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-09-15  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/shared_ptr_atomic.h (_GLIBCXX_TSAN_MUTEX_PRE_LOCK):
        Replace with ...
        (_GLIBCXX_TSAN_MUTEX_TRY_LOCK): ... this, add try_lock flag.
        (_GLIBCXX_TSAN_MUTEX_TRY_LOCK_FAILED): New macro using
        try_lock_failed flag
        (_GLIBCXX_TSAN_MUTEX_POST_LOCK): Rename to ...
        (_GLIBCXX_TSAN_MUTEX_LOCKED): ... this.
        (_GLIBCXX_TSAN_MUTEX_PRE_UNLOCK): Remove invalid flag.
        (_GLIBCXX_TSAN_MUTEX_POST_UNLOCK): Remove invalid flag.
        (_Sp_atomic::_Atomic_count::lock): Use new macros.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-09-14  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/shared_ptr_atomic.h (_GLIBCXX_TSAN_MUTEX_DESTROY)
        (_GLIBCXX_TSAN_MUTEX_PRE_LOCK, _GLIBCXX_TSAN_MUTEX_POST_LOCK)
        (_GLIBCXX_TSAN_MUTEX_PRE_UNLOCK, _GLIBCXX_TSAN_MUTEX_POST_UNLOCK)
        (_GLIBCXX_TSAN_MUTEX_PRE_SIGNAL, _GLIBCXX_TSAN_MUTEX_POST_SIGNAL):
        Define macros for TSan annotation functions.
        (_Sp_atomic::_Atomic_count): Add annotations.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-17  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/memory_resource (new_delete_resource): Add
        nodiscard, returns_nonnull and const attributes.
        (null_memory_resource): Likewise.
        (set_default_resource, get_default_resource): Add returns_nonnull
        attribute.
        (memory_resource::is_equal): Add nodiscard attribute.
        (operator==, operator!=): Likewise.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-09-14  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/future
        (_State_baseV2::__setter(exception_ptr&, promise&)): Add
        assertion for LWG 2276 precondition.
        * testsuite/30_threads/promise/members/set_exception_neg.cc:
        New test.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-09-08  Jonathan Wakely  <jwakely@redhat.com>

        * include/c_global/cstddef (byte): Add always_inline attribute
        to all operator overloads.
        (to_integer): Add always_inline attribute.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-09-08  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/system_error (__adl_only::make_error_code): Add
        deleted function.
        (__adl_only::make_error_condition): Likewise.
        (error_code::error_code(ErrorCodeEnum)): Add using-declaration
        for deleted function.
        (error_condition::error_condition(ErrorConditionEnum)):
        Likewise.
        * testsuite/19_diagnostics/error_code/cons/lwg3629.cc: New test.
        * testsuite/19_diagnostics/error_condition/cons/lwg3629.cc: New test.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-17  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/ios_base.h (io_category): Add const and nodiscard
        attributes.
        (make_error_code, make_error_condition): Add nodiscard.
        * include/std/future (future_category): Add const and nodiscard.
        (make_error_code, make_error_condition): Add nodiscard.
        * include/std/system_error (generic_category system_category):
        Add nodiscard. Replace _GLIBCXX_CONST with C++11 attribute.
        (error_code::value, error_code::category, error_code::operator bool)
        (error_condition::value, error_condition::category)
        (error_condition::operator bool, make_error_code)
        (make_error_condition, operator==, operator!=, operator<=>): Add
        nodiscard.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-13  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/std_thread.h (thread, thread::id): Improve
        doxygen docs.
        * include/std/future: Likewise.
        * include/std/thread (jthread): Likewise.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-13  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/system_error: Improve doxygen comments.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-02-16  Jonathan Wakely  <jwakely@redhat.com>

        * include/ext/throw_allocator.h: Use reserved names for
        parameters.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-11-25  Jonathan Wakely  <jwakely@redhat.com>

        * acinclude.m4 (GLIBCXX_CHECK_UCHAR_H): Don't use AC_MSG_RESULT
        unless the AC_MSG_CHECKING happened.
        * configure: Regenerate.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-01-12  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/abi.xml: Add latest library versions.
        * doc/html/manual/abi.html: Regenerate.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/char_traits.h (char_traits::copy): Return without
        using memcpy if n==0.
        (char_traits::assign): Likewise for memset.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/109299
        * include/bits/basic_string.h (basic_string::_M_is_local()): Add
        hint for compiler that local strings fit in the local buffer.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-03-01  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/cow_string.h: Fix typo in comment.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-02-16  Jonathan Wakely  <jwakely@redhat.com>

        * include/experimental/optional: Fix header name in comment.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-01-16  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/108413
        * include/c_compatibility/stdatomic.h: Change copyright line to
        be consistent with other headers contributed under DCO terms.
        * include/std/expected: Add full stop to copyright line.

2023-03-21  Matthias Kretz  <m.kretz@gsi.de>

        Backported from master:
        2023-03-21  Matthias Kretz  <m.kretz@gsi.de>

        * include/experimental/bits/simd_x86.h
        (_SimdImplX86::_S_divides): Replace test for __GCC_IEC_559 == 0
        with __RECIPROCAL_MATH__.

2023-03-21  Matthias Kretz  <m.kretz@gsi.de>

        Backported from master:
        2023-03-21  Matthias Kretz  <m.kretz@gsi.de>

        * include/experimental/bits/simd_detail.h: Don't define
        _GLIBCXX_SIMD_WORKAROUND_PR90993 for Clang.
        * include/experimental/bits/simd_x86.h (_S_divides): Remove
        check for __clang__.

2023-03-21  Matthias Kretz  <m.kretz@gsi.de>

        Backported from master:
        2023-03-21  Matthias Kretz  <m.kretz@gsi.de>

        * testsuite/experimental/simd/tests/operators.cc: Clang doesn't
        define __GCC_IEC_559. Use __STDC_IEC_559__ instead.

2023-03-20  François Dumont  <fdumont@gcc.gnu.org>

        Backported from master:
        2022-11-16  François Dumont  <fdumont@gcc.gnu.org>

        * python/libstdcxx/v6/printers.py (FilteringTypePrinter): Rename 'match' field
        'template'. Add self.targ1 to specify the first template parameter of the instantiation
        to match.
        (add_one_type_printer): Add targ1 optional parameter, default to None.
        Use gdb.types.get_basic_type to compare the type to recognize and the type
        returned from the typedef lookup.
        (register_type_printers): Adapt calls to add_one_type_printers.

2023-03-20  François Dumont  <fdumont@gcc.gnu.org>

        Backported from master:
        2022-10-03  François Dumont  <fdumont@gcc.gnu.org>

        * python/libstdcxx/v6/printers.py (Printer.add_version): Do not add version
        namespace for __cxx11 symbols.
        (add_one_template_type_printer): Likewise.
        (add_one_type_printer): Likewise.
        (FilteringTypePrinter._recognizer.recognize): Add a workaround for std::string & al
        ambiguous typedef matching both std:: and std::__cxx11:: symbols.
        * testsuite/libstdc++-prettyprinters/cxx17.cc: Remove obsolete
        \#define _GLIBCXX_USE_CXX11_ABI 0.
        * testsuite/libstdc++-prettyprinters/simple.cc: Likewise. Adapt test to accept
        std::__cxx11::list.
        * testsuite/libstdc++-prettyprinters/simple11.cc: Likewise.
        * testsuite/libstdc++-prettyprinters/whatis.cc: Likewise.
        * testsuite/libstdc++-prettyprinters/80276.cc: Likewise and remove xfail for c++20
        and debug mode.
        * testsuite/libstdc++-prettyprinters/libfundts.cc: Likewise.

2023-03-20  François Dumont  <fdumont@gcc.gnu.org>

        Backported from master:
        2022-09-22  François Dumont  <fdumont@gcc.gnu.org>

        * python/libstdcxx/v6/printers.py: Remove ptinter registration for non-existing
        types std::__debug::unique_ptr, std::__debug::stack, std::__debug::queue,
        std::__debug::priority_queue.

2023-03-20  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-03-10  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/109064
        * python/libstdcxx/v6/xmethods.py (SharedPtrUseCountWorker):
        Remove self-recursion in __init__. Add missing _supports.
        * testsuite/libstdc++-xmethods/shared_ptr.cc: Check use_count()
        and unique().

2023-03-20  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/109182
        * include/std/expected (expected<void>::expected(in_place_t)):
        Remove template-head.

2023-03-20  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/109165
        * include/std/coroutine (hash<>::operator()): Add const.
        * testsuite/18_support/coroutines/hash.cc: New test.

2023-03-10  Thomas W Rodgers  <rodgert@twrodgers.com>

        Backported from master:
        2023-02-14  Thomas W Rodgers  <rodgert@twrodgers.com>

        PR libstdc++/103934
        * include/std/atomic (atomic_flag_wait): Add.
        (atomic_flag_wait_explicit): Add.
        (atomic_flag_notify): Add.
        (atomic_flag_notify_explicit): Add.
        * testsuite/29_atomics/atomic_flag/wait_notify/1.cc:
        Add test case to cover missing atomic_flag free functions.

2023-02-23  Matthias Kretz  <m.kretz@gsi.de>

        Backported from master:
        2023-02-23  Matthias Kretz  <m.kretz@gsi.de>

        PR libstdc++/108030
        * include/experimental/bits/simd.h (__vector_broadcast):
        Implement via __vector_broadcast_impl instead of
        __call_with_n_evaluations + 2 lambdas.
        (__vector_broadcast_impl): New.

2023-02-23  Matthias Kretz  <m.kretz@gsi.de>

        Backported from master:
        2023-02-23  Matthias Kretz  <m.kretz@gsi.de>

        * include/experimental/bits/simd_builtin.h (_S_set): Compare as
        int. The actual range of these indexes is very small.

2023-02-23  Matthias Kretz  <m.kretz@gsi.de>

        Backported from master:
        2023-02-23  Matthias Kretz  <m.kretz@gsi.de>

        * include/experimental/bits/simd_x86.h (_S_bit_shift_left)
        (_S_bit_shift_right): Declare constexpr. The implementation was
        already expecting constexpr evaluation.

2023-02-23  Matthias Kretz  <m.kretz@gsi.de>

        Backported from master:
        2023-02-20  Matthias Kretz  <m.kretz@gsi.de>

        * include/experimental/bits/simd.h (__extract_part, split):
        Use reserved name for template parameter.

2023-02-21  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-08-31  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/refwrap.h (reference_wrapper::operator()): Add
        noexcept-specifier and use __invoke_result instead of result_of.
        * testsuite/20_util/reference_wrapper/invoke-noexcept.cc: New test.

2023-02-21  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-02-02  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/108636
        * include/bits/fs_path.h (path::path(string_view, _Type))
        (path::_Cmpt::_Cmpt(string_view, _Type, size_t)): Move inline
        definitions to ...
        * src/c++17/fs_path.cc: ... here.
        * testsuite/27_io/filesystem/path/108636.cc: New test.

2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

        Backported from master:
        2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

        * include/experimental/bits/simd_math.h (__hypot): Bitcasting
        between scalars requires the __bit_cast helper function instead
        of simd_bit_cast.

2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

        Backported from master:
        2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

        * include/experimental/bits/simd_x86.h
        (_SimdImplX86::_S_not_equal_to, _SimdImplX86::_S_less)
        (_SimdImplX86::_S_less_equal): Do not call
        __builtin_is_constant_evaluated in constexpr-if.

2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

        Backported from master:
        2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

        * testsuite/experimental/simd/tests/bits/verify.h
        (verify::verify): Use %zx for size_t in format string.

2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

        Backported from master:
        2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

        * testsuite/experimental/simd/README.md: Document the timeout
        and timeout-factor directives. Minor typo fixed.

2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

        Backported from master:
        2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

        * include/experimental/bits/simd.h
        (_SimdWrapper::_M_is_constprop_none_of)
        (_SimdWrapper::_M_is_constprop_all_of): Return false unless the
        computed result still satisfies __builtin_constant_p.

2023-02-14  Thomas W Rodgers  <rodgert@twrodgers.com>

        Backported from master:
        2023-02-14  Thomas W Rodgers  <rodgert@twrodgers.com>

        PR libstdc++/103934
        * include/std/atomic (atomic_flag_test): Add.
        (atomic_flag_test_explicit): Add.
        * testsuite/29_atomics/atomic_flag/test/explicit.cc: Add
        test case to cover missing atomic_flag free functions.
        * testsuite/29_atomics/atomic_flag/test/implicit.cc:
        Likewise.

2023-02-10  Jakub Jelinek  <jakub@redhat.com>

        Backported from master:
        2022-11-24  Jakub Jelinek  <jakub@redhat.com>

        PR libstdc++/107468
        * src/c++17/fast_float/fast_float.h: Partial merge from fast_float
        2ef9abbcf6a11958b6fa685a89d0150022e82e78 commit.

2023-02-10  Jakub Jelinek  <jakub@redhat.com>

        Backported from master:
        2022-11-07  Jakub Jelinek  <jakub@redhat.com>

        PR libstdc++/107468
        * src/c++17/fast_float/fast_float.h: Partial merge from fast_float
        662497742fea7055f0e0ee27e5a7ddc382c2c38e commit.
        * testsuite/20_util/from_chars/pr107468.cc: New test.

2023-02-02  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-02-01  Jonathan Wakely  <jwakely@redhat.com>

        * src/c++11/random.cc (random_device::_M_fini): Do not try to
        close the file handle if the target doesn't support the
        /dev/random and /dev/urandom files.

2023-02-02  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-02-01  Jonathan Wakely  <jwakely@redhat.com>

        * config/os/generic/error_constants.h (errc::value_too_large)
        [__AVR__]: Define.
        * src/c++11/system_error.cc
        (system_category::default_error_condition) [__AVR__]: Only match
        recognize values equal to EDOM, ERANGE, ENOSYS and EINTR.
        * src/c++17/fs_ops.cc (fs::current_path) [__AVR__]: Do not check
        for ENOENT etc. in switch.
        (fs::remove_all) [__AVR__]: Likewise.
        * src/filesystem/ops-common.h [__AVR__]: Do not use POSIX open,
        close etc.

2023-02-02  Patrick Palka  <ppalka@redhat.com>

        Backported from master:
        2022-11-06  Patrick Palka  <ppalka@redhat.com>

        * include/bits/atomic_wait.h (_detail::__platform_wait_alignment):
        Declare inline.  Remove redundant static specifier.
        (__detail::__atomic_spin_count_relax): Declare inline.
        (__detail::__atomic_spin_count): Likewise.
        * include/bits/regex_automaton.h (__detail::_S_invalid_state_id):
        Declare inline for C++17.  Declare constexpr.  Remove
        redundant const and static specifiers.
        * include/bits/regex_error.h (regex_constants::error_collate):
        Declare inline for C++17 as per P0607R0.
        (regex_constants::error_ctype): Likewise.
        (regex_constants::error_escape): Likewise.
        (regex_constants::error_backref): Likewise.
        (regex_constants::error_brack): Likewise.
        (regex_constants::error_paren): Likewise.
        (regex_constants::error_brace): Likewise.
        (regex_constants::error_badbrace): Likewise.
        (regex_constants::error_range): Likewise.
        (regex_constants::error_space): Likewise.
        (regex_constants::error_badrepeat): Likewise.
        (regex_constants::error_complexity): Likewise.
        (regex_constants::error_stack): Likewise.
        * include/ext/concurrence.h (__gnu_cxx::__default_lock_policy):
        Likewise.  Remove redundant static specifier.
        * include/pstl/execution_defs.h (execution::seq): Declare inline
        for C++17 as per P0607R0.
        (execution::par): Likewise.
        (execution::par_unseq): Likewise.
        (execution::unseq): Likewise.

2023-01-18  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-12-22  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105730
        * src/c++11/compatibility-condvar.cc (__nothrow_wait_cv::wait):
        Access private data member of base class and call its wait
        member.

2023-01-16  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-08-04  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/106183
        * include/bits/atomic_wait.h (__waiter_pool_base::_M_notify):
        Move increment of _M_ver here.
        [!_GLIBCXX_HAVE_PLATFORM_WAIT]: Lock mutex around increment.
        Use relaxed memory order and always notify all waiters.
        (__waiter_base::_M_do_wait) [!_GLIBCXX_HAVE_PLATFORM_WAIT]:
        Check value again after locking mutex.
        (__waiter_base::_M_notify): Remove increment of _M_ver.

2023-01-05  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2023-01-05  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/108265
        * include/std/chrono (hh_mm_ss): Do not use chrono::abs if
        duration rep is unsigned. Remove incorrect noexcept-specifier.
        * testsuite/std/time/hh_mm_ss/1.cc: Check unsigned rep. Check
        floating-point representations. Check default construction.

2022-12-21  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-11-23  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/107814
        * testsuite/experimental/filesystem/iterators/error_reporting.cc:
        Use a static buffer with space after it.

2022-12-21  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-12-16  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/expected (expected::_M_swap_val_unex): Guard the
        correct object.
        (expected::swap): Move is_swappable
        requirement from static_assert to constraint.
        (swap): Likewise.
        (operator==): Remove noexcept-specifier.
        * testsuite/20_util/expected/swap.cc: Check swapping of
        types without non-throwing move constructor. Check constraints
        on swap.
        * testsuite/20_util/expected/unexpected.cc: Check constraints on
        swap.
        * testsuite/20_util/expected/equality.cc: New test.

2022-12-14  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-12-14  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/108097
        * include/std/stacktrace (basic_stracktrace::_Impl): Do not
        multiply N by sizeof(value_type) when allocating.

2022-11-24  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-09-15  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/memory: Do not include <bits/stl_algobase.h>.

2022-11-24  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-11-11  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/20_util/tuple/swap.cc (MoveOnly::operator==): Add
        const qualifier.
        * testsuite/26_numerics/valarray/87641.cc (X::operator==):
        Likewise.

2022-11-24  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-11-02  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/expected (expected::_M_invalid): Remove.

2022-11-24  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-11-21  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/chrono.h (duration): Check preconditions on
        template arguments before using them.

2022-11-24  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-10-28  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/fs_path.h (path::filename()): Fix dangling
        reference.

2022-11-24  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-09-14  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/intro.xml: Document LWG 1203.
        * doc/html/*: Regenerate.

2022-11-24  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-09-07  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/barrier: Add missing runtime exception.

2022-11-24  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-08-04  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/fs_dir.h (directory_iterator): Add comparison
        with std::default_sentinel_t. Remove redundant operator!= for
        C++20.
        * (recursive_directory_iterator): Likewise.
        * include/bits/iterator_concepts.h [!__cpp_lib_concepts]
        (default_sentinel_t, default_sentinel): Define even if concepts
        are not supported.
        * include/bits/regex.h (regex_iterator): Add comparison with
        std::default_sentinel_t. Remove redundant operator!= for C++20.
        (regex_token_iterator): Likewise.
        (regex_token_iterator::_M_end_of_seq()): Add noexcept.
        * testsuite/27_io/filesystem/iterators/lwg3719.cc: New test.
        * testsuite/28_regex/iterators/regex_iterator/lwg3719.cc:
        New test.
        * testsuite/28_regex/iterators/regex_token_iterator/lwg3719.cc:
        New test.

2022-11-24  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-09-23  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/91456
        * include/std/type_traits (__is_nothrow_invocable): Remove.
        (__is_invocable_impl::__nothrow_type): New member type which
        checks if the conversion can throw.
        (__is_nt_invocable_impl): Replace class template with alias
        template to __is_nt_invocable_impl::__nothrow_type.
        * testsuite/20_util/is_nothrow_invocable/91456.cc: New test.
        * testsuite/20_util/is_nothrow_convertible/value.cc: Remove
        macro used by value_ext.cc test.
        * testsuite/20_util/is_nothrow_convertible/value_ext.cc: Remove
        test for non-standard __is_nothrow_invocable trait.

2022-11-22  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/106201
        * include/bits/fs_path.h (filesystem::swap(path&, path&)):
        Replace with abbreviated function template.
        * include/experimental/bits/fs_path.h (filesystem::swap):
        Likewise.
        * testsuite/27_io/filesystem/iterators/106201.cc: New test.
        * testsuite/experimental/filesystem/iterators/106201.cc: New test.

2022-11-22  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-11-22  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/107801
        * src/c++17/memory_resource.cc (pool_sizes): Disable large pools
        for targets with 16-bit int.

2022-11-14  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/mofunc_impl.h (move_only_function::__param_t):
        Use __is_scalar instead of is_trivially_copyable.
        * testsuite/20_util/move_only_function/call.cc: Check parameters
        involving incomplete types.

2022-11-14  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-11-11  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/95048
        * include/bits/fs_path.h (path::_Codecvt): New class template
        that selects the kind of code conversion done.
        (path::_Codecvt<wchar_t>): Select based on sizeof(wchar_t).
        (_GLIBCXX_CONV_FROM_UTF8): New macro to allow the same code to
        be used for Windows and POSIX.
        (path::_S_convert(const EcharT*, const EcharT*)): Simplify by
        using _Codecvt and _GLIBCXX_CONV_FROM_UTF8 abstractions.
        (path::_S_str_convert(basic_string_view<value_type>, const A&)):
        Simplify nested conditions.
        * include/experimental/bits/fs_path.h (path::_Cvt): Define
        nested typedef controlling type of code conversion done.
        (path::_Cvt::_S_wconvert): Use new typedef.
        (path::string(const A&)): Likewise.
        * testsuite/27_io/filesystem/path/construct/95048.cc: New test.
        * testsuite/experimental/filesystem/path/construct/95048.cc: New
        test.

2022-11-14  Nathaniel Shead  <nathanieloshead@gmail.com>

        Backported from master:
        2022-11-11  Nathaniel Shead  <nathanieloshead@gmail.com>

        PR libstdc++/103295
        * include/bits/basic_string.h (_M_use_local_data): Set active
        member to _M_local_buf.

2022-11-08  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-11-08  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/authors.xml: Remove empty author element.
        * doc/xml/manual/spine.xml: Likewise.
        * doc/html/manual/index.html: Regenerate.

2022-10-19  Alexandre Oliva  <oliva@adacore.com>

        Backported from master:
        2022-06-22  Alexandre Oliva  <oliva@adacore.com>

        * libsupc++/eh_globals.cc [!_GLIBCXX_HAVE_TLS]
        (__eh_globals_init::~__eh_globals_init): Clear _S_init first.

2022-09-29  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-09-28  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/evolution.xml: Document std::bind API
        changes.
        * doc/xml/manual/intro.xml: Document LWG 2487 status.
        * doc/xml/manual/using.xml: Clarify default value of
        _GLIBCXX_USE_DEPRECATED.
        * doc/html/*: Regenerate.
        * include/std/functional (_Bind::operator()(Args&&...) volatile)
        (_Bind::operator()(Args&&...) const volatile)
        (_Bind_result::operator()(Args&&...) volatile)
        (_Bind_result::operator()(Args&&...) const volatile): Replace
        with deleted overload for C++20 and later.
        * testsuite/20_util/bind/cv_quals.cc: Check for deprecated
        warnings in C++17.
        * testsuite/20_util/bind/cv_quals_2.cc: Likewise, and check for
        ill-formed in C++20.

2022-09-16  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/abi.xml: Document GLIBCXX_3.4.30 version.
        * doc/html/manual/abi.html: Regenerate.

2022-09-12  Patrick Palka  <ppalka@redhat.com>

        Backported from master:
        2022-09-12  Patrick Palka  <ppalka@redhat.com>

        PR libstdc++/106320
        * testsuite/std/ranges/adaptors/join.cc (test13): New test.

2022-09-07  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-08-22  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/106695
        * include/bits/std_thread.h (thread::_State_impl): Forward
        individual arguments to _Invoker constructor.
        (thread::_Invoker): Add constructor. Delete copies.
        * include/std/future (__future_base::_Deferred_state): Forward
        individual arguments to _Invoker constructor.
        (__future_base::_Async_state_impl): Likewise.
        * testsuite/30_threads/async/106695.cc: New test.
        * testsuite/30_threads/thread/106695.cc: New test.

2022-09-07  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-08-22  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/106607
        * include/bits/regex_compiler.tcc (_Compiler::_M_cur_int_value):
        Use built-ins to check for integer overflow in back-reference
        number.
        * testsuite/28_regex/basic_regex/106607.cc: New test.

2022-08-24  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-08-23  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/106589
        * include/std/variant (__do_visit): Handle is_void<R> for zero
        argument case.
        * testsuite/20_util/variant/visit_r.cc: Check std::visit<void>(v).

2022-08-23  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-08-22  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105678
        * doc/xml/manual/using.xml: Document -lstdc++_libbacktrace
        requirement for using std::stacktrace. Also adjust -frtti and
        -fexceptions to document non-default (i.e. negative) forms.
        * doc/html/*: Regenerate.

2022-08-19  Release Manager

        * GCC 12.2.0 released.

2022-08-05  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-08-04  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/string_view (basic_string_view(Range&&)): Add
        explicit as per P2499R0.
        * testsuite/21_strings/basic_string_view/cons/char/range_c++20.cc:
        Adjust implicit conversions. Check implicit conversions fail.
        * testsuite/21_strings/basic_string_view/cons/wchar_t/range_c++20.cc:
        Likewise.

2022-08-05  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-08-04  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/expected (unexpected::_M_val): Rename to _M_unex.
        (bad_expected_access::_M_val): Likewise.

2022-08-05  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-08-04  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/ios_base.h (__cpp_lib_ios_noreplace): Update
        value to 202207L.
        * include/std/version (__cpp_lib_ios_noreplace): Likewise.
        * testsuite/27_io/basic_ofstream/open/char/noreplace.cc: Check
        for new value.
        * testsuite/27_io/basic_ofstream/open/wchar_t/noreplace.cc:
        Likewise.

2022-08-03  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-06-28  Jonathan Wakely  <jwakely@redhat.com>

        * src/c++17/fs_dir.cc (_Dir::dir_and_pathname):: Replace with
        current() returning _At_path.
        (_Dir::_Dir, _Dir::open_subdir, _Dir::do_unlink): Adjust.
        * src/filesystem/dir-common.h (_Dir_base::_At_path): New class.
        (_Dir_base::_Dir_Base, _Dir_base::openat): Use _At_path.
        * src/filesystem/dir.cc (_Dir::dir_and_pathname): Replace with
        current() returning _At_path.
        (_Dir::_Dir, _Dir::open_subdir): Adjust.

2022-08-03  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-07-29  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104443
        * include/bits/stl_iterator.h (common_iterator::operator->):
        Change return type to just auto.

2022-08-03  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-07-12  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/106248
        * include/std/istream [C++17] (operator>>(istream&, char*)):
        Set eofbit if we stopped extracting at EOF.
        * testsuite/27_io/basic_istream/extractors_character/char/pr106248.cc:
        New test.
        * testsuite/27_io/basic_istream/extractors_character/wchar_t/pr106248.cc:
        New test.

2022-08-03  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-07-01  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/fs_ops.h: Add nodiscard to all pure functions.
        * include/experimental/bits/fs_ops.h: Likewise.
        * testsuite/27_io/filesystem/operations/all.cc: Do not discard
        results of absolute and canonical.
        * testsuite/27_io/filesystem/operations/absolute.cc: Cast
        discarded result to void.
        * testsuite/27_io/filesystem/operations/canonical.cc: Likewise.
        * testsuite/27_io/filesystem/operations/exists.cc: Likewise.
        * testsuite/27_io/filesystem/operations/is_empty.cc: Likewise.
        * testsuite/27_io/filesystem/operations/read_symlink.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/experimental/filesystem/operations/canonical.cc:
        Likewise.
        * testsuite/experimental/filesystem/operations/exists.cc:
        Likewise.
        * testsuite/experimental/filesystem/operations/is_empty.cc:
        Likewise.
        * testsuite/experimental/filesystem/operations/read_symlink.cc:
        Likewise.
        * testsuite/experimental/filesystem/operations/temp_directory_path.cc:
        Likewise.

2022-08-03  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-06-16  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105995
        * include/bits/basic_string.h (_M_use_local_data): Initialize
        the entire SSO buffer.
        * testsuite/21_strings/basic_string/cons/char/105995.cc: New test.

2022-08-03  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-06-14  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/new_allocator.h: Fix indentation.
        * include/ext/malloc_allocator.h: Likewise.

2022-08-03  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-06-14  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105957
        * include/bits/allocator.h (allocator::allocate): Check for
        overflow in constexpr allocation.
        * testsuite/20_util/allocator/105975.cc: New test.

2022-08-03  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-06-10  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105844
        * include/experimental/numeric (experimental::gcd): Simplify
        assertions. Use __abs_r instead of __absu.
        (experimental::lcm): Likewise. Remove use of __detail::__lcm so
        overflow can be detected.
        * include/std/numeric (__detail::__absu): Rename to __abs_r and
        change to allow signed result type, so overflow can be detected.
        (__detail::__lcm): Remove.
        (gcd): Simplify assertions. Use __abs_r instead of __absu.
        (lcm): Likewise. Remove use of __detail::__lcm so overflow can
        be detected.
        * testsuite/26_numerics/gcd/gcd_neg.cc: Adjust dg-error lines.
        * testsuite/26_numerics/lcm/lcm_neg.cc: Likewise.
        * testsuite/26_numerics/gcd/105844.cc: New test.
        * testsuite/26_numerics/lcm/105844.cc: New test.

2022-07-26  Thomas Rodgers  <trodgers@redhat.com>

        Backported from master:
        2022-07-26  Thomas Rodgers  <trodgers@redhat.com>

        * include/bits/atomic_wait.h (__atomic_spin): Merge spin loops.

2022-07-22  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-06-28  Jonathan Wakely  <jwakely@redhat.com>

        * src/c++17/fs_dir.cc (_Dir::_Dir) [!_GLIBCXX_HAVE_OPENAT]:
        Always store pathname if we don't have openat or unlinkat,
        because the full path is needed to open sub-directories and
        remove entries.

2022-07-22  Alexandre Oliva  <oliva@adacore.com>

        Backported from master:
        2022-06-27  Alexandre Oliva  <oliva@adacore.com>

        * src/c++17/fs_dir.cc (dir_and_pathname): Use dirfd if
        _GLIBCXX_HAVE_OPENAT.

2022-07-22  Alexandre Oliva  <oliva@adacore.com>

        Backported from master:
        2022-06-24  Alexandre Oliva  <oliva@adacore.com>

        * acinclude.m4 (GLIBCXX_CHECK_FILESYSTEM_DEPS): Check for
        openat.
        * configure, config.h.in: Rebuilt.
        * src/filesystem/dir-common.h (openat): Use ::openat if
        _GLIBCXX_HAVE_OPENAT.
        * src/filesystem/dir.cc (dir_and_pathname): Use dirfd if
        _GLIBCXX_HAVE_OPENAT.

2022-07-22  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-06  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/stacktrace: Do not include <cxxabi.h>.
        (__cxa_demangle): Declare.

2022-07-21  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-07-20  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/100823
        * include/bits/stl_iterator.h (common_iterator): Define move
        constructor and move assignment operator.
        (common_iterator::_M_assign): New function implementing
        assignment.
        (common_iterator::operator=): Use _M_assign.
        (common_iterator::_S_valueless): New constant.
        * testsuite/24_iterators/common_iterator/100823.cc: New test.

2022-07-21  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-07-20  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/stl_iterator.h (common_iterator): Fix incorrect
        uses of is_nothrow_assignable_v. Fix inconsistent constraints on
        friend declaration. Do not move argument in copy constructor.
        * testsuite/24_iterators/common_iterator/1.cc: Check for
        noexcept constructibnle/assignable.

2022-07-21  Nathan Sidwell  <nathan@acm.org>

        Backported from master:
        2022-05-26  Nathan Sidwell  <nathan@acm.org>

        * include/bits/hashtable.h: Include required headers.
        * include/bits/hashtable_policy.h: Likewise.
        * include/bits/stl_heap.h: Likewise.
        * include/bits/stl_iterator_base_funcs.h: Likewise.

2022-07-21  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-06-30  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/utility.h: Fix comment typos.

2022-07-21  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-06-28  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/20_util/from_chars/4.cc: Only use log2 if C99 math
        functions are available.

2022-07-21  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-06-23  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/26_numerics/random/random_device/entropy.cc: Use
        numeric_limits<unsigned>::digits.

2022-07-21  Marco Falke  <falke.marco@gmail.com>

        Backported from master:
        2022-07-19  Marco Falke  <falke.marco@gmail.com>

        * include/std/charconv (__from_chars_alnum_to_val): Replace
        implicit conversion from int to unsigned char with explicit
        cast.

2022-07-21  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-06-30  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/88881
        * src/filesystem/ops.cc (has_trailing_slash): New helper
        function.
        (fs::status): Strip trailing slashes.
        (fs::symlink_status): Likewise.
        * testsuite/experimental/filesystem/operations/temp_directory_path.cc:
        Clean the environment before each test and use TMP instead of
        TMPDIR so the test passes on Windows.

2022-07-21  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-06-10  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105880
        * libsupc++/eh_globals.cc (eh_globals): Ensure constant init and
        prevent destruction during termination.
        (__eh_globals_init::_M_init): Replace with static member _S_init.
        (__cxxabiv1::__cxa_get_globals_fast): Update.
        (__cxxabiv1::__cxa_get_globals): Likewise.

2022-07-07  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-07-01  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/106162
        * include/Makefile.am (largefile-config.h): Add
        stamp-${host_alias} prerequisite.
        * include/Makefile.in: Regenerate.

2022-07-07  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-06-23  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/27_io/filesystem/iterators/error_reporting.cc: Use
        rmdir to remove directories.
        * testsuite/experimental/filesystem/iterators/error_reporting.cc:
        Likewise.

2022-06-14  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-06-13  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/atomic (__atomic_val_t): Use __type_identity_t
        instead of atomic<T>::value_type, as per LWG 3220.
        * testsuite/29_atomics/atomic/lwg3220.cc: New test.

2022-06-14  Mark Mentovai  <mark@mentovai.com>

        Backported from master:
        2022-06-13  Mark Mentovai  <mark@mentovai.com>

        * include/experimental/bits/fs_path.h (__detail::__null_terminated):
        Rename to __nul_terminated to avoid colliding with a macro in
        Apple's SDK.

2022-06-08  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-27  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105671
        * include/std/sstream (basic_stringbuf::_M_high_mark): Add
        always_inline attribute.

2022-06-08  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-26  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105681
        * include/ext/pb_ds/detail/resize_policy/hash_prime_size_policy_imp.hpp:
        Limit ga_sizes array to values that fit in size_t.
        * include/ext/random [__SIZE_WIDTH < 32] (sfmt86243)
        (sfmt86243_64, sfmt132049, sfmt132049_64, sfmt216091)
        (sfmt216091_64): Do not declare.

2022-06-08  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-19  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/basic_string.h: Do not include <ext/atomicity.h>
        here.
        * include/bits/cow_string.h: Include it here.

2022-05-27  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-26  Jonathan Wakely  <jwakely@redhat.com>

        * python/libstdcxx/v6/printers.py (StdErrorCodePrinter): Make
        lookup for ios_errc and future_errc check versioned namespace.
        (StdAtomicPrinter): Strip versioned namespace from typename.

2022-05-27  François Dumont  <fdumont@gcc.gnu.org>

        Backported from master:
        2022-05-26  François Dumont  <fdumont@gcc.gnu.org>

        * python/libstdcxx/v6/printers.py (StdSpanPrinter.__init__):
        Strip typename from version namespace.

2022-05-27  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-26  Jonathan Wakely  <jwakely@redhat.com>

        * python/libstdcxx/v6/printers.py (SharedPointerPrinter): Strip
        versioned namespace from the template argument too.

2022-05-27  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-26  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/stl_iterator.h (counted_iterator::operator++(int)):
        Add 'constexpr' as per LWG 3643.
        * testsuite/24_iterators/counted_iterator/lwg3643.cc: New test.

2022-05-27  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-19  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/memory_resource (polymorphic_allocator): Add
        non-template equality operator, as proposed for LWG 3683.
        * testsuite/20_util/polymorphic_allocator/lwg3683.cc: New test.

2022-05-27  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-20  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/26_numerics/random/bernoulli_distribution/operators/values.cc:
        Run fewer iterations for simulator targets.
        * testsuite/26_numerics/random/binomial_distribution/operators/values.cc:
        Likewise.
        * testsuite/26_numerics/random/discrete_distribution/operators/values.cc:
        Likewise.
        * testsuite/26_numerics/random/geometric_distribution/operators/values.cc:
        Likewise.
        * testsuite/26_numerics/random/negative_binomial_distribution/operators/values.cc:
        Likewise.
        * testsuite/26_numerics/random/poisson_distribution/operators/values.cc:
        Likewise.
        * testsuite/26_numerics/random/uniform_int_distribution/operators/values.cc:
        Likewise.

2022-05-27  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-17  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/20_util/expected/synopsis.cc: Skip for versioned
        namespace.
        * testsuite/27_io/headers/iosfwd/synopsis.cc: Likewise.

2022-05-27  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-13  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/mofunc_impl.h: Fix doxygen command.

2022-05-27  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-13  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/future (launch): Make operators noexcept.

2022-05-16  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-16  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/prerequisites.xml: Fix attributes for external
        hyperlink.
        * doc/html/manual/setup.html: Regenerate.

2022-05-16  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-16  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/status_cxx2023.xml: Update with gcc-12 support.
        * doc/html/*: Regenerate.

2022-05-16  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-16  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/intro.xml: Include new chapter.
        * doc/xml/manual/status_cxx2020.xml: Tweak release numbers.
        * doc/xml/manual/status_cxx2023.xml: New file.
        * doc/html/*: Regenerate.

2022-05-16  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-16  Jonathan Wakely  <jwakely@redhat.com>

        * doc/html/manual/status.html: Regenerate.
        * doc/xml/manual/status_cxx2020.xml: Fix supported version for
        C++20 bit operations.

2022-05-13  Alexandre Oliva  <oliva@adacore.com>

        Backported from master:
        2022-05-06  Alexandre Oliva  <oliva@adacore.com>

        * include/experimental/bits/simd.h [__ALTIVEC__]: Require VSX
        for double, long long, and 64-bit long intrinsic types.
        [__ALTIVEC__] (__intrinsic_type): Mention 128-bit in
        preexisting long double diagnostic, adjust no-VSX double
        diagnostic to cover 64-bit long double as well.

2022-05-10  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-10  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105284
        * include/std/iosfwd: Add declarations for <spanstream> class
        templates and typedefs.
        * include/std/spanstream (basic_spanbuf, basic_ispanstream)
        (basic_ospanstream, basic_spanstream): Remove default template
        arguments.
        * testsuite/27_io/headers/iosfwd/synopsis.cc: Add <spanstream>
        declarations.
        * testsuite/27_io/headers/iosfwd/types.cc: Check <spanstream>
        default arguments.

2022-05-10  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-10  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105284
        * include/std/iosfwd: Add declarations for <synstream> class
        templates and typedefs.
        * include/std/syncstream (basic_syncbuf, basic_osyncstream):
        Remove default template arguments.
        * testsuite/27_io/headers/iosfwd/synopsis.cc: New test.
        * testsuite/27_io/headers/iosfwd/types.cc: New test.

2022-05-09  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-06  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104731
        * testsuite/27_io/filesystem/iterators/error_reporting.cc:
        Use a trailing char array as storage for dirent::d_name.

2022-05-06  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-05-06  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105502
        * include/bits/random.tcc
        (operator>>(basic_istream<C,T>&, normal_distribution<R>&)):
        Update state when __state_avail is false.
        * testsuite/26_numerics/random/normal_distribution/operators/serialize.cc:
        Check that deserialized object equals serialized one.

2022-05-06  Patrick Palka  <ppalka@redhat.com>

        Backported from master:
        2022-05-02  Patrick Palka  <ppalka@redhat.com>

        PR libstdc++/103911
        * src/c++17/floating_from_chars.cc (find_end_of_float): Accept
        two delimeters for the exponent part in the form of a possibly
        NULL string of length two.  Don't use std::tolower.
        (pattern): Adjust calls to find_end_of_float accordingly.

2022-05-06  Alexandre Oliva  <oliva@adacore.com>

        Backported from master:
        2022-05-03  Alexandre Oliva  <oliva@adacore.com>

        PR c++/105324
        * testsuite/20_util/from_chars/pr105324.cc: Guard test body
        with conditional for floating-point overloads of from_char.

2022-05-06  Release Manager

        * GCC 12.1.0 released.

2022-05-02  Patrick Palka  <ppalka@redhat.com>

        Backported from master:
        2022-05-02  Patrick Palka  <ppalka@redhat.com>

        PR libstdc++/105441
        * src/c++17/floating_from_chars.cc (__floating_from_chars_hex):
        Also accept 'P' as the start of the exponent.
        * testsuite/20_util/from_chars/7.cc: Add corresponding testcase.

2022-04-29  Jonathan Wakely  <jwakely@redhat.com>

        Backported from master:
        2022-04-29  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105417
        * config/abi/post/powerpc64-linux-gnu/baseline_symbols.txt:
        Regenerate.
        * src/c++11/compatibility-ldbl-alt128.cc [_GLIBCXX_USE_DUAL_ABI]:
        Define __gnu_ieee128::num_get<C>::_M_extract_int[abi:cxx11]<I>
        symbols as aliases for corresponding symbols without abi-tag.

2022-04-29  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.

2022-04-28  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/status_cxx1998.xml: Refer to GCC 12 not
        mainline.
        * doc/xml/manual/status_cxx2011.xml: Likewise.
        * doc/xml/manual/status_cxx2014.xml: Likewise.
        * doc/xml/manual/status_cxx2017.xml: Likewise.
        * doc/xml/manual/status_cxx2020.xml: Likewise.
        * doc/xml/manual/status_cxxtr1.xml: Likewise.
        * doc/xml/manual/status_cxxtr24733.xml: Likewise.
        * doc/html/manual/status.html: Regenerate.

2022-04-28  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/99290
        * src/c++17/fs_ops.cc (fs::copy): Pass error_code to
        directory_iterator constructor, and check on each iteration.
        * src/filesystem/ops.cc (fs::copy): Likewise.
        * testsuite/27_io/filesystem/operations/copy.cc: Check for
        errors during recursion.
        * testsuite/experimental/filesystem/operations/copy.cc:
        Likewise.

2022-04-28  François Dumont  <fdumont@gcc.gnu.org>

        * config/abi/pre/gnu-versioned-namespace.ver: Remove
        std::random_device::* pattern.

2022-04-27  Jakub Jelinek  <jakub@redhat.com>

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

2022-04-27  Jonathan Wakely  <jwakely@redhat.com>

        * python/libstdcxx/v6/printers.py (SharedPointerPrinter): Add
        support for atomic<shared_ptr<T>> and atomic<weak_ptr<T>>.
        (StdAtomicPrinter): New printer.
        (build_libstdcxx_dictionary): Register new printer.
        * testsuite/libstdc++-prettyprinters/cxx11.cc: Test std::atomic.
        * testsuite/libstdc++-prettyprinters/cxx20.cc: Test atomic smart
        pointers.

2022-04-26  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/shared_ptr_atomic.h (atomic<shared_ptr>): Add
        constructor for constant initialization from nullptr_t.
        * testsuite/20_util/shared_ptr/atomic/atomic_shared_ptr.cc:
        Check for new constructor.

2022-04-26  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/fs_path.h (hash<filesystem::path>): Define.
        * testsuite/27_io/filesystem/path/nonmember/hash_value.cc:
        Check std::hash specialization.

2022-04-25  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/ptr_traits.h (__cpp_lib_constexpr_memory): Define
        conditionally.
        * include/bits/unique_ptr.h (__cpp_lib_constexpr_memory):
        Define for C++23.
        (default_delete, default_delete<T[]>, __uniq_ptr_impl)
        (unique_ptr, unique_ptr<T[], D>): Add constexpr to all member
        functions.
        * include/std/version (__cpp_lib_constexpr_memory): Define new
        value for C++23.
        * testsuite/20_util/unique_ptr/assign/constexpr.cc: New test.
        * testsuite/20_util/unique_ptr/comparison/constexpr.cc: New test.
        * testsuite/20_util/unique_ptr/cons/constexpr_c++20.cc: New test.
        * testsuite/20_util/unique_ptr/creation/constexpr.cc: New test.
        * testsuite/20_util/unique_ptr/modifiers/constexpr.cc: New test.
        * testsuite/20_util/unique_ptr/specialized_algorithms/constexpr.cc:
        New test.

2022-04-25  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105375
        * include/std/future (packaged_task): Add deduction guides.
        * testsuite/30_threads/packaged_task/cons/deduction.cc: New test.

2022-04-25  Philipp Fent  <fent@in.tum.de>

        * python/libstdcxx/v6/printers.py (StdSpanPrinter._iterator):
        Rename as iterator.
        (StdInitializerListPrinter): Define new printer.
        (build_libstdcxx_dictionary): Register new printer.
        * testsuite/libstdc++-prettyprinters/cxx11.cc: Check printer for
        initializer_list.

2022-04-22  Thomas W Rodgers  <trodgers@redhat.com>

        PR libstdc++/102994
        * include/bits/atomic_base.h (atomic_flag::notify_one,
        notify_all): Remove const qualification.
        (__atomic_base::notify_one, notify_all): Likewise.
        * include/std/atomic (atomic<bool>::notify_one, notify_all):
        Likewise.
        (atomic::notify_one, notify_all): Likewise.
        (atomic<T*>::notify_one, notify_all): Likewise.
        (atomic_notify_one, atomic_notify_all): Likewise.
        * testsuite/29_atomics/atomic/wait_notify/102994.cc: Adjust test
        to account for change in notify_one/notify_all signature.

2022-04-21  Patrick Palka  <ppalka@redhat.com>

        * include/std/charconv (__from_chars_alnum_to_val_table):
        Simplify initialization of __lower/__upper_letters.
        (__from_chars_alnum_to_val): Default the template parameter to
        false.
        * src/c++17/floating_from_chars.cc (starts_with_ci): Don't
        assume the uppercase and lowercase letters are contiguous.
        (__floating_from_chars_hex): Likewise.

2022-04-21  Patrick Palka  <ppalka@redhat.com>

        PR c++/105297
        PR c++/105322
        * include/std/charconv (__from_chars_alnum_to_val): Make
        initializer for __table dependent in an artificial way.

2022-04-21  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105324
        * src/c++17/floating_from_chars.cc (buffer_resource::do_allocate):
        Remove assertion.
        * testsuite/20_util/from_chars/pr105324.cc: New test.

2022-04-20  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/21_strings/basic_string_view/operations/copy/char/constexpr.cc:
        Check correct feature test macro.

2022-04-20  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/93602
        * doc/xml/manual/prerequisites.xml: Document libiconv
        workarounds.
        * doc/html/manual/setup.html: Regenerate.
        * src/Makefile.am (CXXLINK): Add $(LTLIBICONV).
        * src/Makefile.in: Regenerate.

2022-04-19  Patrick Palka  <ppalka@redhat.com>

        * src/c++17/floating_to_chars.cc (_GLIBCXX_ASSERTIONS): Don't
        define.
        (__floating_to_chars_shortest): Add __builtin_unreachable calls to
        squelch false-positive -Wmaybe-uninitialized and -Wreturn-type
        warnings.
        (__floating_to_chars_precision): Likewise.

2022-04-19  Philipp Fent  <fent@in.tum.de>

        * python/libstdcxx/v6/printers.py (StdSpanPrinter): Define.
        * testsuite/libstdc++-prettyprinters/cxx20.cc: Test it.

2022-04-19  Jonathan Wakely  <jwakely@redhat.com>

        * acinclude.m4 (GLIBCXX_ENABLE_BACKTRACE): Fix shell operators.
        * configure: Regenerate.

2022-04-18  Patrick Palka  <ppalka@redhat.com>

        * include/std/charconv (__from_chars_pow2_base): Manually
        unroll the first iteration of the main loop and simplify
        accordingly.

2022-04-15  Patrick Palka  <ppalka@redhat.com>

        PR libstdc++/104858
        * include/bits/ranges_algo.h (__minmax_fn): Avoid dereferencing
        __first twice at the start.
        * testsuite/25_algorithms/minmax/constrained.cc (test06): New test.

2022-04-15  Patrick Palka  <ppalka@redhat.com>

        * include/std/charconv (__from_chars_alnum_to_val_table): Define.
        (__from_chars_alnum_to_val): Define.
        (__from_chars_binary): Rename to ...
        (__from_chars_pow2_base): ... this.  Generalize to handle any
        power-of-two base using __from_chars_alnum_to_val.
        (__from_chars_digit): Optimize digit recognition to a single
        test instead of two tests.  Use [[__unlikely___]] attribute.
        (__from_chars_alpha_to_num): Remove.
        (__from_chars_alnum): Use __from_chars_alnum_to_val.  Use a
        nested loop for the overflow case.  Maintain a lower bound
        on the number of available bits in the result and use it to
        omit the overflow check.
        (from_chars): Adjust appropriately.
        * src/c++17/floating_from_chars.cc (ascii_to_hexit): Remove.
        (__floating_from_chars_hex): Use __from_chars_alnum_to_val
        to recognize a hex digit instead.

2022-04-14  Palmer Dabbelt  <palmer@rivosinc.com>

        * acinclude.m4 (GLIBCXX_ENABLE_LOCK_POLICY): Force auto to mutex
        for RISC-V.
        * configure: Regenerate.

2022-04-14  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/intro.xml: Fix comment.

2022-04-14  Jonathan Wakely  <jwakely@redhat.com>

        * include/precompiled/stdc++.h: Include <stacktrace> and
        <stdatomic.h> for C++23.

2022-04-14  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105269
        * include/bits/stl_vector.h (__cpp_lib_constexpr_vector):
        Define.
        * include/c_compatibility/stdatomic.h (__cpp_lib_stdatomic_h):
        Define.
        * include/std/optional (__cpp_lib_optional): Define new value
        for C++23.
        (__cpp_lib_monadic_optional): Remove.
        * include/std/version (__cpp_lib_constexpr_vector): Define.
        (__cpp_lib_stdatomic_h): Define.
        (__cpp_lib_optional): Define new value for C++23.
        (__cpp_lib_monadic_optional): Remove.
        * testsuite/20_util/optional/monadic/and_then.cc: Adjust.
        * testsuite/20_util/optional/requirements.cc: Adjust for C++23.
        * testsuite/20_util/optional/version.cc: Likewise.
        * testsuite/23_containers/vector/cons/constexpr.cc: Check
        feature test macro.
        * testsuite/29_atomics/headers/stdatomic.h/c_compat.cc:
        Likewise.
        * testsuite/20_util/optional/monadic/version.cc: Removed.
        * testsuite/23_containers/vector/requirements/version.cc: New test.
        * testsuite/29_atomics/headers/stdatomic.h/version.cc: New test.

2022-04-12  Jonathan Wakely  <jwakely@redhat.com>

        * acinclude.m4 (GLIBCXX_ENABLE_BACKTRACE): Check for mmap.
        * config.h.in: Regenerate.
        * configure: Regenerate.

2022-04-12  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/stacktrace (basic_stacktrace::current): Reallocate
        a smaller container if the unused capacity is larger than the
        used size.

2022-04-12  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/stacktrace (basic_stacktrace): Use _Impl::_M_clone
        or _Impl::_M_assign to initialize elements in allocated storage.
        (basic_stacktrace::_M_clear()): Use _Impl::_M_resize instead of
        _Impl::_M_destroy.
        (basic_stacktrace::_Impl::_M_destroy()): Replace with ...
        (basic_stacktrace::_Impl::_M_resize(size_type, allocator&)): New
        function.
        (basic_stacktrace::_Impl::_M_push_back): Use _M_xclone. Construct
        new element using allocator.
        (basic_stacktrace::_Impl::_M_clone): New function.
        (basic_stacktrace::_Impl::_M_xclone): New function.
        (basic_stacktrace::_Impl::_M_assign): New function.

2022-04-12  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/stacktrace (basic_stacktrace::_Impl::_M_allocate):
        Use nothrow new instead of try block for std::allocator.
        (basic_stacktrace::_Impl::_M_deallocate): Use delete for
        std::allocator.

2022-04-12  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/stacktrace (basic_stacktrace::current): Replace
        calls to _M_reserve and _S_curr_cb with call to _M_prepare.
        Check return value of backtrace_simple when max depth given.
        (basic_stacktrace::_M_reserve): Remove.
        (basic_stacktrace::_S_curr_cb): Remove.
        (basic_stacktrace::_M_prepare(size_type)): New function to
        reserve initial capacity and return callback.
        (basic_stacktrace::_Impl::_M_allocate): Remove check for 0 < n
        and remove redundant zeroing of _M_frames and _M_capacity.
        (basic_stacktrace::_Impl::_M_push_back): Add [[unlikely]]
        attribute. Assign _Impl instead of swapping.
        * testsuite/19_diagnostics/stacktrace/current.cc: New test.

2022-04-11  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/stacktrace (basic_stacktrace::_Impl::_M_allocate):
        Change [[unlikely]] attribute to [[likely]].

2022-04-11  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105031
        * include/std/stacktrace (basic_stacktrace::basic_stacktrace):
        Fix allocator usage in constructors.
        (basic_stacktrace::operator=(const basic_stacktrace&)): Do not
        try to reallocate using const allocator.
        (basic_stacktrace::operator=(basic_stacktrace&&)): Fix
        if-constexpr with non-constant condition. Do not allocate new
        storage if allocator propagates. Do not set _M_size if
        allocation fails.
        (basic_stacktrace::swap(basic_stacktrace&)): Fix typo. Add
        assertion that non-propagating allocators are equal.
        * testsuite/19_diagnostics/stacktrace/stacktrace.cc: New test.

2022-04-11  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/stacktrace (basic_stacktrace::current): Duplicate
        implementation into each overload. Add noinline attribute and
        skip current frame.
        (basic_stacktrace::max_size()): Call _Impl::_S_max_size.
        (basic_stacktrace::_S_curr_cb()): New function defining lambda.
        (basic_stacktrace::_Impl::_S_max_size): New function defining
        maximum size in terms of allocator and size_type.
        (basic_stacktrace::_Impl::_M_allocate): Check against
        max_size().
        * testsuite/19_diagnostics/stacktrace/entry.cc: Call function
        for non-constexpr checks. Check line number is correct.

2022-04-11  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/20_util/stacktrace/entry.cc: Moved to...
        * testsuite/19_diagnostics/stacktrace/entry.cc: ...here.
        * testsuite/20_util/stacktrace/synopsis.cc: Moved to...
        * testsuite/19_diagnostics/stacktrace/synopsis.cc: ...here.
        * testsuite/20_util/stacktrace/version.cc: Moved to...
        * testsuite/19_diagnostics/stacktrace/version.cc: ...here.

2022-04-11  Jonathan Wakely  <jwakely@redhat.com>

        * include/experimental/bits/fs_path.h (path): Define special
        members after path::_Cmpt is complete.

2022-04-08  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105153
        * include/std/expected
        (expected<void,E>::expected(expected<U,G>&&)): Fix constraints.
        * testsuite/20_util/expected/cons.cc: Check constructor.

2022-04-08  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105154
        * include/std/expected (expected<void, E>::swap): Set
        _M_has_value to false for objects that previously had a value.
        * testsuite/20_util/expected/swap.cc: Fix test to check void
        specialization.

2022-04-08  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105146
        * include/std/expected (bad_expected_access): Move constructor
        parameter.
        * testsuite/20_util/expected/bad.cc: New test.

2022-04-07  Hans-Peter Nilsson  <hp@axis.com>

        * testsuite/20_util/expected/requirements.cc: Correct minimal-size
        test.

2022-04-02  Jakub Jelinek  <jakub@redhat.com>

        PR libstdc++/105128
        * include/std/source_location (std::source_location::__impl): Move
        definition before using __builtin_ret_type.

2022-04-01  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/utility (unreachable): Define for C++23.
        * include/std/version (__cpp_lib_unreachable): Define.
        * src/c++11/debug.cc (__glibcxx_assert_fail): Check for valid
        arguments. Handle only the function being given.
        * testsuite/20_util/unreachable/1.cc: New test.
        * testsuite/20_util/unreachable/version.cc: New test.

2022-04-01  Jonathan Wakely  <jwakely@redhat.com>

        * include/experimental/bits/fs_fwd.h (copy_file): Remove
        incorrect noexcept from declaration.
        * include/experimental/bits/fs_path.h (path::begin, path::end):
        Add noexcept to declarations, to match definitions.

2022-04-01  Timm Bäder  <tbaeder@redhat.com>

        * include/bits/fs_ops.h: Fix filename in Doxygen comment.
        * include/experimental/bits/fs_ops.h: Likewise.

2022-03-31  Jonathan Wakely  <jwakely@redhat.com>

        * libsupc++/new_opa.cc (aligned_alloc): Add comment.

2022-03-29  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/18_support/exception/38732.cc: Disable for C++23.
        * testsuite/18_support/headers/exception/synopsis.cc: Likewise.
        * testsuite/18_support/unexpected_handler.cc: Likewise.

2022-03-29  Jonathan Wakely  <jwakely@redhat.com>

        * libsupc++/compare (_Strong_order) [!__cpp_using_enum]: Add
        static data members for _Fp_fmt enumerators.

2022-03-29  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/version (__cpp_lib_variant): Fix conditions to
        match <variant>.
        (__cpp_lib_expected): Fix condition to match <expected>.

2022-03-28  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/20_util/optional/monadic/and_then.cc: Fix typo.
        * testsuite/20_util/optional/monadic/transform.cc: Likewise.
        * testsuite/22_locale/codecvt/always_noconv/char/1.cc: Likewise.
        * testsuite/22_locale/codecvt/encoding/char/1.cc: Likewise.
        * testsuite/22_locale/codecvt/in/char/1.cc: Likewise.
        * testsuite/22_locale/codecvt/max_length/char/1.cc: Likewise.
        * testsuite/22_locale/codecvt/out/char/1.cc: Likewise.
        * testsuite/22_locale/codecvt/unshift/char/1.cc: Likewise.

2022-03-27  Jonathan Wakely  <jwakely@redhat.com>

        * doc/doxygen/user.cfg.in: Add new header.
        * include/Makefile.am: Likewise.
        * include/Makefile.in: Regenerate.
        * include/precompiled/stdc++.h: Add new header.
        * include/std/version (__cpp_lib_expected): Define.
        * libsupc++/exception [__cplusplus > 202002] (unexpected)
        (unexpected_handler, set_unexpected): Do not declare for C++23.
        * include/std/expected: New file.
        * testsuite/20_util/expected/assign.cc: New test.
        * testsuite/20_util/expected/cons.cc: New test.
        * testsuite/20_util/expected/illformed_neg.cc: New test.
        * testsuite/20_util/expected/observers.cc: New test.
        * testsuite/20_util/expected/requirements.cc: New test.
        * testsuite/20_util/expected/swap.cc: New test.
        * testsuite/20_util/expected/synopsis.cc: New test.
        * testsuite/20_util/expected/unexpected.cc: New test.
        * testsuite/20_util/expected/version.cc: New test.

2022-03-25  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/bit (bit_cast, byteswap, endian): Add doxygen
        comments.

2022-03-23  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105027
        * include/std/bit (bit_cast): Add constraints.
        * testsuite/26_numerics/bit/bit.cast/105027.cc: New test.

2022-03-23  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/version [!_GLIBCXX_HOSTED]
        (__cpp_lib_hardware_interference_size): Define for freestanding.
        (__cpp_lib_bit_cast): Likewise.
        (__cpp_lib_is_layout_compatible): Likewise.
        (__cpp_lib_is_pointer_interconvertible): Likewise.
        (__cpp_lib_adaptor_iterator_pair_constructor): Do not define for
        freestanding.
        (__cpp_lib_invoke_r): Likewise.
        (__cpp_lib_ios_noreplace): Likewise.
        (__cpp_lib_monadic_optional): Likewise.
        (__cpp_lib_move_only_function): Likewise.
        (__cpp_lib_spanstream): Likewise.
        (__cpp_lib_stacktrace): Likewise.
        (__cpp_lib_string_contains): Likewise.
        (__cpp_lib_string_resize_and_overwrite): Likewise.
        (__cpp_lib_to_underlying): Likewise.

2022-03-23  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/105021
        * include/bits/atomic_base.h [!_GLIBCXX_HOSTED]: Do not include
        <bits/atomic_wait.h> for freestanding.

2022-03-22  Hans-Peter Nilsson  <hp@axis.com>

        * testsuite/20_util/from_chars/6.cc (test01) [FE_DOWNWARD]:
        Conditionalize call to fesetround.

2022-03-21  Jakub Jelinek  <jakub@redhat.com>

        PR libstdc++/104990
        * include/bits/locale_facets_nonio.tcc (get): Don't check if do_get
        isn't overloaded if __clang__ is defined.

2022-03-18  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104242
        * include/std/any (any(T&&)): Revert change to constraints.
        * testsuite/20_util/any/cons/104242.cc: New test.

2022-03-18  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/92546
        * include/pstl/glue_algorithm_defs.h: Replace <functional> with
        <bits/stl_pair.h>.
        * include/pstl/utils.h: Replace <iterator> with <type_traits>.
        (__pstl::__internal::__except_handler): Use std::__terminate
        instead of std::terminate.
        * src/c++17/fs_path.cc: Include <array>.
        * testsuite/25_algorithms/adjacent_find/constexpr.cc: Include
        <functional>.
        * testsuite/25_algorithms/binary_search/constexpr.cc: Likewise.
        * testsuite/25_algorithms/clamp/constrained.cc: Likewise.
        * testsuite/25_algorithms/equal/constrained.cc: Likewise.
        * testsuite/25_algorithms/for_each/constrained.cc: Likewise.
        * testsuite/25_algorithms/includes/constrained.cc: Likewise.
        * testsuite/25_algorithms/is_heap/constexpr.cc: Likewise.
        * testsuite/25_algorithms/is_heap_until/constexpr.cc: Likewise.
        * testsuite/25_algorithms/is_permutation/constrained.cc: Include
        <iterator>.
        * testsuite/25_algorithms/is_sorted/constexpr.cc: Include
        <functional>.
        * testsuite/25_algorithms/is_sorted_until/constexpr.cc:
        Likewise.
        * testsuite/25_algorithms/lexicographical_compare/constexpr.cc:
        Likewise.
        * testsuite/25_algorithms/lexicographical_compare/constrained.cc:
        Likewise.
        * testsuite/25_algorithms/lexicographical_compare_three_way/1.cc:
        Include <array>.
        * testsuite/25_algorithms/lower_bound/constexpr.cc: Include
        <functional>.
        * testsuite/25_algorithms/max/constrained.cc: Likewise.
        * testsuite/25_algorithms/max_element/constrained.cc: Likewise.
        * testsuite/25_algorithms/min/constrained.cc: Likewise.
        * testsuite/25_algorithms/min_element/constrained.cc: Likewise.
        * testsuite/25_algorithms/minmax_element/constrained.cc:
        Likewise.
        * testsuite/25_algorithms/mismatch/constexpr.cc: Likewise.
        * testsuite/25_algorithms/move/93872.cc: Likewise.
        * testsuite/25_algorithms/move_backward/93872.cc: Include
        <iterator>.
        * testsuite/25_algorithms/nth_element/constexpr.cc: Include
        <functional>.
        * testsuite/25_algorithms/partial_sort/constexpr.cc: Likewise.
        * testsuite/25_algorithms/partial_sort_copy/constexpr.cc:
        Likewise.
        * testsuite/25_algorithms/search/constexpr.cc: Likewise.
        * testsuite/25_algorithms/search_n/constrained.cc: Likewise.
        * testsuite/25_algorithms/set_difference/constexpr.cc: Likewise.
        * testsuite/25_algorithms/set_difference/constrained.cc:
        Likewise.
        * testsuite/25_algorithms/set_intersection/constexpr.cc:
        Likewise.
        * testsuite/25_algorithms/set_intersection/constrained.cc:
        Likewise.
        * testsuite/25_algorithms/set_symmetric_difference/constexpr.cc:
        Likewise.
        * testsuite/25_algorithms/set_union/constexpr.cc: Likewise.
        * testsuite/25_algorithms/set_union/constrained.cc: Likewise.
        * testsuite/25_algorithms/sort/constexpr.cc: Likewise.
        * testsuite/25_algorithms/sort_heap/constexpr.cc: Likewise.
        * testsuite/25_algorithms/transform/constrained.cc: Likewise.
        * testsuite/25_algorithms/unique/constexpr.cc: Likewise.
        * testsuite/25_algorithms/unique/constrained.cc: Likewise.
        * testsuite/25_algorithms/unique_copy/constexpr.cc: Likewise.
        * testsuite/25_algorithms/upper_bound/constexpr.cc: Likewise.
        * testsuite/std/ranges/adaptors/elements.cc: Include <vector>.
        * testsuite/std/ranges/adaptors/lazy_split.cc: Likewise.
        * testsuite/std/ranges/adaptors/split.cc: Likewise.

2022-03-17  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/92546
        * include/bits/fs_path.h (path::make_preferred): Use
        handwritten loop instead of std::replace.

2022-03-17  Jonathan Wakely  <jwakely@redhat.com>

        PR middle-end/104966
        * include/bits/locale_facets_nonio.tcc
        (__moneypunct_cache::_M_cache): Replace try-catch with RAII and
        make all string copies before any stores to *this.

2022-03-17  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/util/testsuite_character.h: Fix comment.

2022-03-16  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/103407
        * config/abi/pre/gnu.ver: Make version for std::from_chars
        depend on HAVE_USELOCALE macro.
        * testsuite/util/testsuite_abi.cc (compare_symbols): Treat
        std::from_chars for floating-point types as undesignated if
        not found in the baseline symbols file.

2022-03-16  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/charconv (__cpp_lib_to_chars): Only define when
        both from_chars and to_chars are supported for floating-point
        types.
        (from_chars, to_chars): Adjust preprocessor conditions guarding
        declarations.
        * include/std/version (__cpp_lib_to_chars): Adjust condition to
        match <charconv> definition.
        * src/c++17/floating_from_chars.cc (from_chars_strtod): New
        function template.
        (from_chars): Simplify preprocessor checks and use
        from_chars_strtod when appropriate.

2022-03-14  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104875
        * src/c++11/codecvt.cc (read_utf8_code_point): Use char32_t to
        hold octets that will be left-shifted.

2022-03-10  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104870
        * src/c++17/floating_from_chars.cc: Check __SIZE_WIDTH__ >= 32
        before using fast_float.

2022-03-10  Detlef Vollmann  <dv@vollmann.ch>

        PR libstdc++/104866
        * include/bits/this_thread_sleep.h: Fix order of #endif and
        closing brace of namespace.

2022-03-10  Jonathan Wakely  <jwakely@redhat.com>

        * libsupc++/compare (_Strong_order::_S_fp_cmp) [__vax__]:
        Handle NaN.

2022-03-10  Jonathan Wakely  <jwakely@redhat.com>

        * libsupc++/compare (_Strong_ordering::_S_fp_cmp) [__vax__]: Use
        <=> comparison.

2022-03-09  Patrick Palka  <ppalka@redhat.com>

        PR libstdc++/104859
        * src/c++17/floating_to_chars.cc (__floating_to_chars_hex):
        Be explicit when narrowing the shifted effective_mantissa,
        since it may have an integer-class type.

2022-03-08  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/uses_allocator_args.h: Remove incorrect copyright
        notice.

2022-03-07  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104807
        * include/bits/c++config (__terminate, __glibcxx_assert_fail):
        Replace _GLIBCXX_VISIBILITY on function with visibility pragma.
        (__is_constant_evaluated): Add visibility pragma.

2022-03-07  Rasmus Villemoes  <rasmus.villemoes@prevas.dk>

        * config/locale/vxworks/ctype_members.cc: Remove <iostream>
          include.

2022-03-05  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/c++config (__glibcxx_assert_fail): Add visibility
        attribute.
        (__terminate): Likewise.

2022-03-04  Jonathan Wakely  <jwakely@redhat.com>

        * libsupc++/compare (strong_order::_S_fp_cmp): Move typedef
        inside #if condition.

2022-03-03  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104748
        * testsuite/std/ranges/adaptors/all.cc: Use non-debug vector for
        constexpr test.

2022-03-03  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/17_intro/names.cc (func): Undef on AIX.

2022-03-03  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/96526
        * libsupc++/compare (strong_order): Add missing support for
        floating-point types.
        * testsuite/18_support/comparisons/algorithms/strong_order_floats.cc:
        New test.

2022-03-01  Jonathan Wakely  <jwakely@redhat.com>

        PR middle-end/103984
        * include/bits/regex_compiler.h (_BracketMatcher::_M_char): Use
        default member initializer.

2022-02-24  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104602
        * include/std/source_location (source_location::current): Use
        deduced type of __builtin_source_location().

2022-02-22  Patrick Palka  <ppalka@redhat.com>

        * include/bits/ranges_base.h (__detail::__is_initializer_list):
        Define.
        (viewable_range): Adjust as per P2415R2.
        * include/bits/ranges_cmp.h (__cpp_lib_ranges): Adjust value.
        * include/std/ranges (owning_view): Define as per P2415R2.
        (enable_borrowed_range<owning_view>): Likewise.
        (views::__detail::__can_subrange): Replace with ...
        (views::__detail::__can_owning_view): ... this.
        (views::_All::_S_noexcept): Sync with operator().
        (views::_All::operator()): Use owning_view instead of subrange
        as per P2415R2.
        * include/std/version (__cpp_lib_ranges): Adjust value.
        * testsuite/std/ranges/adaptors/all.cc (test06): Adjust now that
        views::all uses owning_view instead of subrange.
        (test08): New test.
        * testsuite/std/ranges/adaptors/lazy_split.cc (test09): Adjust
        now that rvalue non-view non-borrowed ranges are viewable.
        * testsuite/std/ranges/adaptors/split.cc (test06): Likewise.

2022-02-17  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104559
        * doc/xml/manual/evolution.xml: Document deprecation.
        * doc/html/manual/api.html: Regenerate.
        * include/bits/stl_bvector.h (insert(const_iterator, const bool&)):
        Remove default argument.
        (insert(const_iterator)): New overload with deprecated attribute.
        * testsuite/23_containers/vector/bool/modifiers/insert/104559.cc:
        New test.

2022-02-17  Jonathan Wakely  <jwakely@redhat.com>

        * python/libstdcxx/v6/printers.py (StdErrorCodePrinter): Replace
        code that call cat->name() on std::error_category objects.
        Identify known categories by symbol name and use a hardcoded
        name. Print error code values as enumerators where appopriate.
        * testsuite/libstdc++-prettyprinters/cxx11.cc: Adjust expected
        name of custom category. Check io_errc and future_errc errors.

2022-02-15  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104542
        * include/bits/uses_allocator_args.h (make_obj_using_allocator)
        (uninitialized_construct_using_allocator): Add constexpr.
        * testsuite/20_util/uses_allocator/make_obj.cc: Check constexpr.
        * testsuite/20_util/uses_allocator/uninitialized_construct.cc: New test.

2022-02-14  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/100912
        * config/locale/gnu/c_locale.h (__convert_from_v): Use inline
        namespace for IEEE128 long double mode.
        * config/os/gnu-linux/ldbl-ieee128-extra.ver: Add new symbol
        version and export __gnu_cxx_ieee128::__convert_from_v.
        * include/bits/locale_facets_nonio.tcc (money_put::__do_put):
        Make __ibm128 overload use snprintf directly
        * testsuite/util/testsuite_abi.cc: Add new symbol version.
        Remove stable IEEE128/LDBL versions.

2022-02-14  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/103891
        * include/bits/c++config (_GLIBCXX_HAVE_COND_TRIVIAL_SPECIAL_MEMBERS):
        Remove.
        * include/std/variant: Check feature test macros instead.
        * include/std/version: Likewise.

2022-02-14  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/20_util/unsynchronized_pool_resource/allocate.cc:
        Fix typo.

2022-02-14  Jonathan Wakely  <jwakely@redhat.com>

        * src/c++17/floating_to_chars.cc (FLOAT128_TO_CHARS): Depend on
        LONG_DOUBLE_ALT128_COMPAT instead of USE_FLOAT128.

2022-02-11  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/20_util/temporary_buffer.cc: Fix dg-warning target
        selector.

2022-02-11  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/20_util/monotonic_buffer_resource/allocate.cc:
        Ignore -Walloc-larger-than warning.
        * testsuite/20_util/unsynchronized_pool_resource/allocate.cc:
        Likewise.
        * testsuite/29_atomics/atomic/cons/user_pod.cc: Compile with -O1
        to avoid linker error for __atomic_is_lock_free.

2022-02-10  Thomas Rodgers  <rodgert@appliantology.com>

        * include/bits/atomic_wait.h (__waiter_base::_S_do_spin,
        __waiter_base::_S_do_spin_v): Change memory order from relaxed
        to acquire.

2022-02-10  Jonathan Wakely  <jwakely@redhat.com>

        * include/c_compatibility/stdatomic.h (atomic_fetch_xor): Add
        using-declaration.
        (atomic_fetch_xor_explicit): Likewise.
        * testsuite/29_atomics/headers/stdatomic.h/c_compat.cc: Check
        arithmetic and logical operations for atomic_int.

2022-02-10  Jonathan Wakely  <jwakely@redhat.com>

        * src/filesystem/dir-common.h (_GLIBCXX_HAVE_DIRFD): Undefine
        when <dirent.h> is not available.
        (_GLIBCXX_HAVE_UNLINKAT):  Likewise.

2022-02-09  Thomas Rodgers  <rodgert@appliantology.com>

        PR libstdc++/104442
        * include/bits/atomic_wait.h (__waiter::_M_do_wait_v): Move spin
         loop inside do loop so that threads failing the wait, reload
         _M_ver.

2022-02-08  Jonathan Wakely  <jwakely@redhat.com>

        * src/c++17/fs_dir.cc (_Dir(DIR*, const path&)): Change first
        parameter to _Dir_base&&.
        * src/filesystem/dir-common.h (_Dir_base(DIR*)): Remove.
        * src/filesystem/dir.cc (_Dir(DIR*, const path&)): Change first
        parameter to _Dir_base&&.

2022-02-08  Jonathan Wakely  <jwakely@redhat.com>

        * acinclude.m4 (GLIBCXX_ENABLE_LOCK_POLICY): Add comment about
        checking for CAS on correct word size.

2022-02-08  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/experimental/filesystem/operations/create_directories.cc:
        Adjust expected results for Windows.

2022-02-08  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104161
        * src/c++17/fs_dir.cc (fs::recursive_directory_iterator::__erase):
        [i_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Refresh entry._M_type member,
        instead of checking for errno values indicating a directory.
        * src/c++17/fs_ops.cc (fs::remove_all(const path&)): Use similar
        logic to non-throwing overload.
        (fs::remove_all(const path&, error_code&)): Add comments.
        * src/filesystem/ops-common.h: Likewise.

2022-02-04  Jonathan Wakely  <jwakely@redhat.com>

        * src/filesystem/dir-common.h (_Dir_base::openat): Change return
        type to use portable posix::DIR alias.

2022-02-04  Jonathan Wakely  <jwakely@redhat.com>

        * include/c_compatibility/stdatomic.h [__clang__]: Use
        #include_next <stdatomic.h>.

2022-02-04  Jonathan Wakely  <jwakely@redhat.com>

        * include/experimental/bits/fs_ops.h (fs::copy_file): Remove
        noexcept.
        (fs::create_directories): Likewise.
        (fs::remove_all): Likewise.
        * src/filesystem/ops.cc (fs::copy_file): Remove noexcept.
        (fs::create_directories): Likewise.
        (fs::remove_all): Likewise.

2022-02-04  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104161
        * acinclude.m4 (GLIBCXX_CHECK_FILESYSTEM_DEPS): Check for dirfd
        and unlinkat.
        * config.h.in: Regenerate.
        * configure: Regenerate.
        * include/bits/fs_dir.h (recursive_directory_iterator): Declare
        remove_all overloads as friends.
        (recursive_directory_iterator::__erase): Declare new member
        function.
        * include/bits/fs_fwd.h (remove, remove_all): Declare.
        * src/c++17/fs_dir.cc (_Dir): Add filename_only parameter to
        constructor. Pass file descriptor argument to base constructor.
        (_Dir::dir_and_pathname, _Dir::open_subdir, _Dir::do_unlink)
        (_Dir::unlink, _Dir::rmdir): Define new member functions.
        (directory_iterator): Pass filename_only argument to _Dir
        constructor.
        (recursive_directory_iterator::_Dir_stack): Adjust constructor
        parameters to take a _Dir rvalue instead of creating one.
        (_Dir_stack::orig): Add data member for storing original path.
        (_Dir_stack::report_error): Define new member function.
        (__directory_iterator_nofollow): Move here from dir-common.h and
        fix value to be a power of two.
        (__directory_iterator_filename_only): Define new constant.
        (recursive_directory_iterator): Construct _Dir object and move
        into _M_dirs stack. Pass skip_permission_denied argument to first
        advance call.
        (recursive_directory_iterator::increment): Use _Dir::open_subdir.
        (recursive_directory_iterator::__erase): Define new member
        function.
        * src/c++17/fs_ops.cc (ErrorReporter, do_remove_all): Remove.
        (fs::remove_all): Use new recursive_directory_iterator::__erase
        member function.
        * src/filesystem/dir-common.h (_Dir_base): Add int parameter to
        constructor and use openat to implement nofollow semantics.
        (_Dir_base::fdcwd, _Dir_base::set_close_on_exec, _Dir_base::openat):
        Define new member functions.
        (__directory_iterator_nofollow): Move to fs_dir.cc.
        * src/filesystem/dir.cc (_Dir): Pass file descriptor argument to
        base constructor.
        (_Dir::dir_and_pathname, _Dir::open_subdir): Define new member
        functions.
        (recursive_directory_iterator::_Dir_stack): Adjust constructor
        parameters to take a _Dir rvalue instead of creating one.
        (recursive_directory_iterator): Check for new nofollow option.
        Construct _Dir object and move into _M_dirs stack. Pass
        skip_permission_denied argument to first advance call.
        (recursive_directory_iterator::increment): Use _Dir::open_subdir.
        * src/filesystem/ops.cc (fs::remove_all): Use C++17 remove_all.

2022-02-04  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/allocator.h: Qualify std::allocator_traits in
        deprecated warnings.
        * libsupc++/exception (uncaught_exception): Add suggestion to
        deprecated warning.

2022-02-02  Jonathan Wakely  <jwakely@redhat.com>

        * src/c++17/fs_dir.cc (fs::recursive_directory_iterator::pop):
        Add [[maybe_unused]] attribute.
        * src/filesystem/dir.cc (fs::recursive_directory_iterator::pop):
        Likewise.

2022-02-02  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/23_containers/multiset/operators/cmp_c++20.cc: Use
        custom comparison function for multiset.
        * testsuite/23_containers/set/operators/cmp_c++20.cc: Use custom
        comparison function for set.

2022-02-02  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/boost_concept_check.h (_OutputIteratorConcept):
        Change member function to data member of function pointer type.

2022-02-02  Martin Sebor  <msebor@redhat.com>

        PR libstdc++/101831
        * include/std/array (begin): Declare const member function attribute
        const.
        (end, rbegin, rend, size, max_size, empty, data): Same.
        * testsuite/23_containers/array/capacity/empty.cc: Add test cases.
        * testsuite/23_containers/array/capacity/max_size.cc: Same.
        * testsuite/23_containers/array/capacity/size.cc: Same.
        * testsuite/23_containers/array/iterators/begin_end.cc: New test.

2022-02-02  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/27_io/filesystem/iterators/error_reporting.cc: Use
        autoconf macro to check whether d_type is present.
        * testsuite/experimental/filesystem/iterators/error_reporting.cc:
        Likewise.

2022-02-01  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/27_io/filesystem/iterators/97731.cc: New test.
        * testsuite/27_io/filesystem/iterators/recursive_directory_iterator.cc:
        Check follow_directory_symlink option.
        * testsuite/experimental/filesystem/iterators/recursive_directory_iterator.cc:
        Likewise.

2022-02-01  Jonathan Wakely  <jwakely@redhat.com>

        * src/c++17/fs_dir.cc (recursive_directory_iterator::increment):
        Reset state to past-the-end iterator on error.
        (fs::recursive_directory_iterator::pop(error_code&)): Likewise.
        (fs::recursive_directory_iterator::pop()): Check _M_dirs before
        it might get reset.
        * src/filesystem/dir.cc (recursive_directory_iterator): Likewise,
        for the TS implementation.
        * testsuite/27_io/filesystem/iterators/error_reporting.cc: New test.
        * testsuite/experimental/filesystem/iterators/error_reporting.cc: New test.

2022-02-01  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/fs_fwd.h (filesystem::perms): Fix comment.

2022-02-01  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104301
        * acinclude.m4 (GLIBCXX_ENABLE_CSTDIO): Print different messages
        for stdio_pure and stdio_posix options.
        * configure: Regenerate.

2022-02-01  Thomas Rodgers  <rodgert@appliantology.com>

        * include/bits/atomic_wait.h: Change memory order from
        Acquire/Release with relaxed loads to SeqCst+Release for
        accesses to the waiter's count.

2022-01-31  Martin Liska  <mliska@suse.cz>

        * acinclude.m4: Detect *_ld_is_mold and use it.
        * configure: Regenerate.

2022-01-30  Hans-Peter Nilsson  <hp@axis.com>

        * testsuite/27_io/basic_istream/get/char/lwg3464.cc: Don't run on
        simulator targets.
        * testsuite/27_io/basic_istream/get/wchar_t/lwg3464.cc: Likewise.

2022-01-27  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/100516
        * include/bits/deque.tcc (_M_range_initialize<ForwardIterator>):
        Add __builtin_unreachable to loop.
        * testsuite/23_containers/deque/100516.cc: New test.

2022-01-27  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/ranges_base.h (ranges::advance): Avoid signed
        overflow. Do nothing if already equal to desired result.
        * testsuite/24_iterators/range_operations/advance_overflow.cc:
        New test.

2022-01-27  Martin Liska  <mliska@suse.cz>

        PR libstdc++/104259
        * acinclude.m4: Fix typo.
        * configure: Regenerate.

2022-01-25  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104019
        * include/bits/istream.tcc (basic_istream::sentry): Add braces
        around try-block.
        * include/bits/shared_ptr_base.h (_Sp_counted_array_base::_M_init):
        Add pragmas to disable bogus warnings from PR 61596.

2022-01-25  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104217
        * src/c++17/fs_ops.cc (_GNU_SOURCE): Define.
        * src/filesystem/dir.cc (_GNU_SOURCE): Define.
        * src/filesystem/ops.cc (_GNU_SOURCE): Define.

2022-01-25  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104161
        * acinclude.m4 (GLIBCXX_CHECK_FILESYSTEM_DEPS): Check for
        fdopendir.
        * config.h.in: Regenerate.
        * configure: Regenerate.
        * src/c++17/fs_dir.cc (_Dir): Add nofollow flag to constructor
        and pass it to base class constructor.
        (directory_iterator): Pass nofollow flag to _Dir constructor.
        (fs::recursive_directory_iterator::increment): Likewise.
        * src/c++17/fs_ops.cc (do_remove_all): Use nofollow option for
        directory_iterator constructor. Move error check outside loop.
        * src/filesystem/dir-common.h (_Dir_base): Add nofollow flag to
        constructor and when it's set use ::open with O_NOFOLLOW and
        O_DIRECTORY.
        * src/filesystem/dir.cc (_Dir): Add nofollow flag to constructor
        and pass it to base class constructor.
        (directory_iterator): Pass nofollow flag to _Dir constructor.
        (fs::recursive_directory_iterator::increment): Likewise.
        * src/filesystem/ops.cc (remove_all): Use nofollow option for
        directory_iterator constructor. Move error check outside loop.

2022-01-23  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104032
        * include/std/spanstream (basic_spanbuf(basic_spanbuf&&)): Use
        mem-initializer for _M_buf.
        (basic_spanbuf::Operator=(basic_spanbuf&&)): Fix ill-formed
        member access.
        * testsuite/27_io/spanstream/2.cc: New test.

2022-01-23  Jonathan Wakely  <jwakely@redhat.com>

        * src/c++17/floating_from_chars.cc (USE_STRTOD_FOR_FROM_CHARS):
        Define macro for case where std::from_chars is implemented in
        terms of strtod, strtof or strtold.
        (buffer_resource, valid_fmt, find_end_of_float, pattern)
        (from_chars_impl, make_result, reserve_string): Do not define
        unless USE_STRTOD_FOR_FROM_CHARS is defined.
        (from_chars): Define when at least one of USE_LIB_FAST_FLOAT and
        USE_STRTOD_FOR_FROM_CHARS is defined, instead of
        _GLIBCXX_HAVE_USELOCALE. Use fast_float for long double when it
        is binary64.

2022-01-23  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104174
        * include/bits/hashtable_policy.h (_Map_base): Add partial
        specialization for maps with const key types.
        * testsuite/23_containers/unordered_map/104174.cc: New test.

2022-01-23  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104019
        * include/bits/shared_ptr_base.h (_Sp_counted_base<>::_M_release):
        Set members to zero without type punning.

2022-01-21  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/20_util/shared_ptr/cons/array.cc: Fix comment.

2022-01-21  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/87193
        PR libstdc++/104019
        * include/bits/alloc_traits.h (__cpp_lib_allocator_traits_is_always_equal):
        Define as type long.
        * include/bits/allocator.h (__cpp_lib_incomplete_container_elements):
        Likewise.
        * include/bits/basic_string.h (__cpp_lib_string_udls): Likewise.
        * include/bits/chrono.h (__cpp_lib_chrono): Likewise.
        (__cpp_lib_chrono_udls): Likewise.
        * include/bits/move.h (__cpp_lib_addressof_constexpr): Likewise.
        * include/bits/node_handle.h (__cpp_lib_node_extract): Likewise.
        * include/bits/range_access.h (__cpp_lib_nonmember_container_access):
        Likewise.
        * include/bits/shared_ptr.h (__cpp_lib_enable_shared_from_this):
        Likewise.
        * include/bits/stl_algo.h (__cpp_lib_clamp): Likewise.
        (__cpp_lib_sample): Likewise.
        * include/bits/stl_algobase.h (__cpp_lib_robust_nonmodifying_seq_ops):
        Likewise.
        * include/bits/stl_function.h (__cpp_lib_transparent_operators):
        Likewise.
        * include/bits/stl_iterator.h (__cpp_lib_make_reverse_iterator):
        Likewise.
        * include/bits/stl_map.h (__cpp_lib_map_try_emplace):
        Likewise.
        * include/bits/stl_tree.h (__cpp_lib_generic_associative_lookup):
        Likewise.
        * include/bits/unique_ptr.h (__cpp_lib_make_unique):
        Likewise.
        * include/bits/unordered_map.h (__cpp_lib_unordered_map_try_emplace):
        Likewise.
        * include/c_global/cmath (__cpp_lib_hypot): Likewise.
        * include/c_global/cstddef (__cpp_lib_byte): Likewise.
        * include/std/atomic (__cpp_lib_atomic_is_always_lock_free):
        Likewise.
        * include/std/complex (__cpp_lib_complex_udls): Likewise.
        * include/std/filesystem (__cpp_lib_filesystem): Likewise.
        * include/std/functional (__cpp_lib_not_fn): Likewise.
        (__cpp_lib_boyer_moore_searcher): Likewise.
        * include/std/iomanip (__cpp_lib_quoted_string_io): Likewise.
        * include/std/mutex (__cpp_lib_scoped_lock): Likewise.
        * include/std/numeric (__cpp_lib_gcd_lcm): Likewise.
        (__cpp_lib_gcd, __cpp_lib_lcm): Likewise.
        * include/std/tuple (__cpp_lib_apply): Likewise.
        (__cpp_lib_make_from_tuple): Likewise.
        * include/std/type_traits (__cpp_lib_integral_constant_callable)
        (__cpp_lib_bool_constant, __cpp_lib_logical_traits)
        (__cpp_lib_is_null_pointer, __cpp_lib_transformation_trait_aliases)
        (__cpp_lib_result_of_sfinae, __cpp_lib_void_t)
        (__cpp_lib_is_swappable, __cpp_lib_is_invocable)
        (__cpp_lib_has_unique_object_representations)
        (__cpp_lib_is_aggregate): Likewise.
        * include/std/version: Likewise.
        * libsupc++/new (__cpp_lib_launder): Likewise.

2022-01-21  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/version (__cpp_lib_shared_ptr_arrays): Fix
        condition for C++17 definition.

2022-01-21  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/shared_ptr_atomic.h (_Sp_atomic::_Atomic_count):
        Add constexpr.
        (_Sp_atomic::_M_ptr): Add default member-initializer.
        * testsuite/20_util/shared_ptr/atomic/atomic_shared_ptr.cc:
        Check constant initialization.
        * testsuite/20_util/weak_ptr/atomic_weak_ptr.cc: Likewise.

2022-01-20  Jonathan Wakely  <jwakely@redhat.com>

        * src/c++11/cxx11-ios_failure.cc (__constinit): Define as
        equivalent attribute for Clang.
        * src/c++11/future.cc (__constinit): Likewise.
        * src/c++11/system_error.cc (__constinit): Likewise.
        * src/c++17/memory_resource.cc (__constinit): Likewise.

2022-01-20  Jonathan Wakely  <jwakely@redhat.com>

        * scripts/testsuite_flags.in: Only add src/filesystem/.libs and
        src/libbacktrace/.libs to LDFLAGS if those directories exist.

2022-01-19  Jonathan Wakely  <jwakely@redhat.com>

        * configure.ac (GLIBCXX_ENABLE_DEBUG_FLAGS): Remove -gdwarf-4
        from default flags.
        * configure: Regenerate.

2022-01-19  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104123
        * testsuite/29_atomics/headers/stdatomic.h/c_compat.cc: Include
        <stddef.h>.

2022-01-19  Jonathan Wakely  <jwakely@redhat.com>

        * scripts/testsuite_flags.in: Add src/libbacktrace/.libs to
        linker search paths.
        * src/Makefile.am: Fix src/debug/libbacktrace build.
        * src/Makefile.in: Regenerate.
        * src/libbacktrace/Makefile.am: Use per-library CPPFLAGS
        variable. Use symlinks for the source files.
        * src/libbacktrace/Makefile.in: Regenerate.

2022-01-19  Matthias Kretz  <m.kretz@gsi.de>

        * include/experimental/bits/simd.h (__floating_point_flags): Do
        not rely on math_errhandling to expand to a constant expression.

2022-01-19  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/evolution.xml: Document deprecations.
        * doc/xml/manual/status_cxx2017.xml: Update status.
        * doc/html/*: Regenerate.

2022-01-19  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/stl_tempbuf.h (get_temporary_buffer): Change
        _GLIBCXX14_DEPRECATED to _GLIBCXX17_DEPRECATED.

2022-01-19  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/stl_pair.h (_PCC::_DeprConsPair): Remove unused
        function.

2022-01-19  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104101
        * include/bits/shared_ptr_atomic.h (_Sp_atomic::_Atomic_count::lock):
        Only use __thread_relax if __cpp_lib_atomic_wait is defined.

2022-01-18  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104099
        * include/bits/basic_string.h (basic_string(nullptr_t)): Only
        define for C++23.
        (operator=(nullptr_t)): Likewise.
        * include/bits/cow_string.h: Likewise.
        * include/std/string_view (basic_string_view(nullptr_t)):
        Likewise.
        * testsuite/21_strings/basic_string/cons/char/nullptr.cc: Adjust
        expected error. Add examples that become ill-formed in C++23.
        * testsuite/21_strings/basic_string_view/cons/char/nonnull.cc:
        Adjust expected errors.
        * testsuite/21_strings/basic_string_view/cons/wchar_t/nonnull.cc:
        Likewise.

2022-01-18  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104098
        * include/bits/stl_iterator.h (reverse_iterator): Check
        __cpp_lib_concepts instead of __cplusplus.

2022-01-18  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/101124
        * include/bits/stl_pair.h (pair): Adjust constraints on
        deprecated constructors accepting literal zero as null pointer
        constant. Improve wording of deprecated attribute.
        * testsuite/20_util/pair/cons/99957.cc: Check that deprecated
        constructors do not cause ambiguities for copyable types.

2022-01-18  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/stl_function.h (ptr_fun): Fix suggestion for
        non-deprecated alternative.

2022-01-18  Tom Honermann  <tom@honermann.net>

        * acinclude.m4: Define config macros if uchar.h provides
        c8rtomb() and mbrtoc8().
        * config.h.in: Regenerate.
        * configure: Regenerate.
        * include/c_compatibility/uchar.h (c8rtomb, mbrtoc8): Define.
        * include/c_global/cuchar (c8rtomb, mbrtoc8): Likewise.
        * include/c_std/cuchar (c8rtomb, mbrtoc8): Likewise.
        * testsuite/21_strings/headers/cuchar/functions_std_cxx20.cc:
        New test.
        * testsuite/21_strings/headers/cuchar/functions_std_fchar8_t.cc:
        New test.

2022-01-18  Jonathan Wakely  <jwakely@redhat.com>

        * include/Makefile.am: Install new header.
        * include/Makefile.in: Regenerate.
        * include/c_compatibility/stdatomic.h: New file.
        * testsuite/29_atomics/headers/stdatomic.h/c_compat.cc: New test.

2022-01-18  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104080
        * src/c++17/fast_float/LOCAL_PATCHES: Update.
        * src/c++17/fast_float/fast_float.h (FASTFLOAT_IS_BIG_ENDIAN):
        Define in terms of __BYTE_ORDER__.

2022-01-18  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104080
        * src/c++17/fast_float/LOCAL_PATCHES: UPDATE.
        * src/c++17/fast_float/fast_float.h (round): Use explicit
        template argument list for std::min.

2022-01-18  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/status_cxx2017.xml: Update C++17 status.
        * doc/xml/manual/status_cxx2020.xml: Use 12.1 instead of 12 for
        upcoming release.
        * doc/html/manual/status.html: Regenerate.

2022-01-18  Jonathan Wakely  <jwakely@redhat.com>

        * acinclude.m4 (GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING): Improve
        comments.
        * configure: Regenerate.

2022-01-17  Patrick Palka  <ppalka@redhat.com>

        * src/c++17/floating_from_chars.cc: (USE_LIB_FAST_FLOAT):
        Conditionally define, and use it to conditionally include
        fast_float.
        (from_chars): Use fast_float for float and double when
        USE_LIB_FAST_FLOAT.

2022-01-17  Patrick Palka  <ppalka@redhat.com>

        * src/c++17/fast_float/LOCAL_PATCHES: Update.
        * src/c++17/fast_float/fast_float.h (from_chars_advanced): In
        case of over/underflow, return errc::result_out_of_range and don't
        modify 'value'.

2022-01-17  Patrick Palka  <ppalka@redhat.com>

        * src/c++17/fast_float/LOCAL_PATCHES: Update.
        * src/c++17/fast_float/fast_float.h: Apply local modifications.

2022-01-17  Patrick Palka  <ppalka@redhat.com>

        * src/c++17/fast_float/LOCAL_PATCHES: New file.
        * src/c++17/fast_float/MERGE: New file.
        * src/c++17/fast_float/README.md: New file, copied from the
        fast_float repository.
        * src/c++17/fast_float/fast_float.h: New file, an amalgamation
        of the fast_float library.

2022-01-17  Patrick Palka  <ppalka@redhat.com>

        * src/c++17/floating_from_chars.cc: Include <bit>.
        (ascii_to_hexit, starts_with_ci): Conditionally define.
        (__floating_from_chars_hex):  Conditionally define.
        (from_chars): Use __floating_from_chars_hex for
        chars_format::hex parsing of binary32/64 float/double.
        (testsuite/20_util/from_chars/7.cc): New test.
        * testsuite/20_util/from_chars/7.cc: New file.

2022-01-17  Jonathan Wakely  <jwakely@redhat.com>

        * acinclude.m4 (GLIBCXX_ENABLE_BACKTRACE): New macro.
        * configure.ac: Use GLIBCXX_ENABLE_BACKTRACE.
        * include/Makefile.am: Add new header.
        * include/Makefile.in: Regenerate.
        * include/std/stacktrace: New header.
        * include/std/version (__cpp_lib_stacktrace): Define.
        * Makefile.in: Regenerate.
        * config.h.in: Regenerate.
        * configure: Regenerate.
        * doc/Makefile.in: Regenerate.
        * libsupc++/Makefile.in: Regenerate.
        * po/Makefile.in: Regenerate.
        * python/Makefile.in: Regenerate.
        * src/Makefile.am: Regenerate.
        * src/Makefile.in: Regenerate.
        * src/c++11/Makefile.in: Regenerate.
        * src/c++17/Makefile.in: Regenerate.
        * src/c++20/Makefile.in: Regenerate.
        * src/c++98/Makefile.in: Regenerate.
        * src/filesystem/Makefile.in: Regenerate.
        * testsuite/Makefile.in: Regenerate.
        * src/libbacktrace/Makefile.am: New file.
        * src/libbacktrace/Makefile.in: New file.
        * src/libbacktrace/backtrace-rename.h: New file.
        * src/libbacktrace/backtrace-supported.h.in: New file.
        * src/libbacktrace/config.h.in: New file.
        * testsuite/lib/libstdc++.exp (check_effective_target_stacktrace):
        New proc.
        * testsuite/20_util/stacktrace/entry.cc: New test.
        * testsuite/20_util/stacktrace/synopsis.cc: New test.
        * testsuite/20_util/stacktrace/version.cc: New test.

2022-01-17  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/status_cxx2020.xml: Use final C++20 option
        names.
        * doc/html/manual/status.html: Regenerate.

2022-01-17  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/103650
        * include/Makefile.am: Rename LT_OBJDIR and STDC_HEADERS.
        * include/Makefile.in: Regenerate.
        * testsuite/17_intro/headers/c++1998/103650.cc: New test.

2022-01-17  Matthias Kretz  <m.kretz@gsi.de>

        * include/experimental/bits/simd.h (__floating_point_flags): Do
        not rely on the presence of the math_errhandling macro.

2022-01-17  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/shared_ptr_atomic.h (_Sp_atomic): Add typename
        to qualified-id for dependent type.

2022-01-17  Jonathan Wakely  <jwakely@redhat.com>

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

2022-01-17  Jonathan Wakely  <jwakely@redhat.com>
            Thomas Rodgers  <trodgers@redhat.com>

        * include/bits/shared_ptr_atomic.h (__cpp_lib_atomic_shared_ptr):
        New macro.
        (_Sp_atomic): New class template.
        (atomic<shared_ptr<T>>, atomic<weak_ptr<T>>): New partial
        specializations.
        * include/bits/shared_ptr_base.h (__shared_count, __weak_count)
        (__shared_ptr, __weak_ptr): Declare _Sp_atomic as a friend.
        * include/std/version (__cpp_lib_atomic_shared_ptr): New macro.
        * testsuite/20_util/shared_ptr/atomic/atomic_shared_ptr.cc: New
        test.
        * testsuite/20_util/weak_ptr/atomic_weak_ptr.cc: New test.

2022-01-15  Matthias Kretz  <m.kretz@gsi.de>

        * include/experimental/bits/simd.h: Move feature detection bools
        and add __have_avx512bitalg, __have_avx512vbmi2,
        __have_avx512vbmi, __have_avx512ifma, __have_avx512cd,
        __have_avx512vnni, __have_avx512vpopcntdq.
        (__detail::__machine_flags): New function which returns a unique
        uint64 depending on relevant -m and -f flags.
        (__detail::__odr_helper): New type alias for either an anonymous
        type or a type specialized with the __machine_flags number.
        (_SimdIntOperators): Change template parameters from _Impl to
        _Tp, _Abi because _Impl now has an __odr_helper parameter which
        may be _OdrEnforcer from the anonymous namespace, which makes
        for a bad base class.
        (many): Either add __odr_helper template parameter or mark as
        always_inline.
        * include/experimental/bits/simd_detail.h: Add defines for
        AVX512BITALG, AVX512VBMI2, AVX512VBMI, AVX512IFMA, AVX512CD,
        AVX512VNNI, AVX512VPOPCNTDQ, and AVX512VP2INTERSECT.
        * include/experimental/bits/simd_builtin.h: Add __odr_helper
        template parameter or mark as always_inline.
        * include/experimental/bits/simd_fixed_size.h: Ditto.
        * include/experimental/bits/simd_math.h: Ditto.
        * include/experimental/bits/simd_scalar.h: Ditto.
        * include/experimental/bits/simd_neon.h: Add __odr_helper
        template parameter.
        * include/experimental/bits/simd_ppc.h: Ditto.
        * include/experimental/bits/simd_x86.h: Ditto.

2022-01-14  Uroš Bizjak  <ubizjak@gmail.com>

        * testsuite/22_locale/numpunct/members/char/3.cc:
        Require pt_PT locale instead of nl_NL.
        (test02): Use pt_PT locale instead of nl_NL.

2022-01-14  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/91260
        PR libstdc++/91383
        PR libstdc++/95065
        * include/backward/binders.h (bind1st, bind2nd): Add deprecated
        attribute.
        * include/bits/refwrap.h (_Maybe_unary_or_binary_function):
        Disable deprecated warnings for base classes.
        (_Reference_wrapper_base): Likewise.
        * include/bits/shared_ptr_base.h (_Sp_owner_less): Likewise.
        * include/bits/stl_bvector.h (_Bit_iterator_base): Likewise.
        * include/bits/stl_function.h (unary_function, binary_function):
        Add deprecated attribute.
        (unary_negate, not1, binary_negate, not2, ptr_fun)
        (pointer_to_unary_function, pointer_to_binary_function)
        (mem_fun_t, const_mem_fun_t, mem_fun_ref_t, const_mem_fun_ref_t)
        (mem_fun1_t, const_mem_fun1_t, mem_fun_ref1_t)
        (const_mem_fun1_ref_t, mem_fun, mem_fun_ref): Add deprecated
        attributes.
        * include/bits/stl_iterator.h: Disable deprecated warnings for
        std::iterator base classes.
        * include/bits/stl_iterator_base_types.h (iterator): Add
        deprecated attribute.
        * include/bits/stl_map.h (map::value_compare): Disable
        deprecated warnings for base class.
        * include/bits/stl_multimap.h (multimap::value_compare):
        Likewise.
        * include/bits/stl_raw_storage_iter.h (raw_storage_iterator):
        Add deprecated attribute.
        * include/bits/stl_tempbuf.h (get_temporary_buffer): Likewise.
        * include/bits/stream_iterator.h: Disable deprecated warnings.
        * include/bits/streambuf_iterator.h: Likewise.
        * include/ext/bitmap_allocator.h: Remove unary_function base
        classes.
        * include/ext/functional: Disable deprecated warnings.
        * include/ext/rope: Likewise.
        * include/ext/throw_allocator.h: Likewise.
        * include/std/type_traits (result_of): Add deprecated attribute.
        * include/tr1/functional: Disable deprecated warnings.
        * include/tr1/functional_hash.h: Likewise.
        * testsuite/20_util/function_objects/binders/1.cc: Add
        -Wno-disable-deprecations.
        * testsuite/20_util/function_objects/binders/3113.cc: Likewise.
        * testsuite/20_util/function_objects/constexpr.cc: Add
        dg-warning.
        * testsuite/20_util/raw_storage_iterator/base.cc: Likewise.
        * testsuite/20_util/raw_storage_iterator/dr2127.cc: Likewise.
        * testsuite/20_util/raw_storage_iterator/requirements/base_classes.cc:
        Likewise.
        * testsuite/20_util/raw_storage_iterator/requirements/explicit_instantiation/1.cc:
        Likewise.
        * testsuite/20_util/raw_storage_iterator/requirements/typedefs.cc:
        Likewise.
        * testsuite/20_util/reference_wrapper/24803.cc:
        Likewise.
        * testsuite/20_util/reference_wrapper/typedefs.cc: Enable for
        C++20 and check for absence of nested types.
        * testsuite/20_util/shared_ptr/comparison/less.cc: Remove
        std::binary_function base class.
        * testsuite/20_util/temporary_buffer.cc: Add dg-warning.
        * testsuite/21_strings/basic_string/cons/char/69092.cc: Remove
        std::iterator base class.
        * testsuite/24_iterators/back_insert_iterator/requirements/base_classes.cc:
        Likewise.
        * testsuite/24_iterators/front_insert_iterator/requirements/base_classes.cc:
        Likewise.
        * testsuite/24_iterators/insert_iterator/requirements/base_classes.cc:
        Likewise.
        * testsuite/24_iterators/istream_iterator/requirements/base_classes.cc:
        Likewise.
        * testsuite/24_iterators/istreambuf_iterator/92285.cc:
        Likewise.
        * testsuite/24_iterators/istreambuf_iterator/requirements/base_classes.cc:
        Likewise.
        * testsuite/24_iterators/ostream_iterator/requirements/base_classes.cc:
        Likewise.
        * testsuite/24_iterators/ostreambuf_iterator/requirements/base_classes.cc:
        Likewise.
        * testsuite/24_iterators/reverse_iterator/requirements/base_classes.cc:
        Likewise.
        * testsuite/25_algorithms/copy/34595.cc:
        Likewise.
        * testsuite/25_algorithms/minmax/3.cc: Remove std::binary_function
        base class.
        * testsuite/25_algorithms/all_of/requirements/explicit_instantiation/2.cc:
        Disable deprecated warnings.
        * testsuite/25_algorithms/all_of/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/any_of/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/any_of/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/copy_if/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/copy_if/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/count_if/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/count_if/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/find_end/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/find_end/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/find_first_of/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/find_first_of/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/find_if/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/find_if/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/find_if_not/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/find_if_not/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/for_each/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/for_each/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/is_partitioned/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/is_partitioned/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/is_permutation/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/is_permutation/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/none_of/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/none_of/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/partition/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/partition/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/partition_copy/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/partition_copy/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/partition_point/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/partition_point/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/random_shuffle/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/random_shuffle/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/remove_copy_if/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/remove_copy_if/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/remove_if/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/remove_if/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/replace_copy_if/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/replace_copy_if/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/replace_if/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/replace_if/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/search/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/search/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/search_n/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/search_n/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/stable_partition/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/stable_partition/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/25_algorithms/transform/requirements/explicit_instantiation/2.cc:
        Likewise.
        * testsuite/25_algorithms/transform/requirements/explicit_instantiation/pod.cc:
        Likewise.
        * testsuite/27_io/basic_filebuf/underflow/wchar_t/9178.cc: Add
        dg-warning.
        * testsuite/ext/pb_ds/example/priority_queue_erase_if.cc:
        Likewise.
        * testsuite/ext/pb_ds/example/priority_queue_split_join.cc:
        Likewise.
        * testsuite/tr1/3_function_objects/reference_wrapper/typedefs.cc:
        Disable deprecated warnings.
        * testsuite/tr1/6_containers/hash/requirements/base_classes.cc:
        Likewise.
        * testsuite/util/regression/trait/erase_if_fn.hpp: Remove
        std::unary_function base classes.
        * testsuite/util/testsuite_iterators.h (output_iterator_wrapper):
        Remove std::iterator base classes.

2022-01-14  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/shared_ptr.h (__cpp_lib_shared_ptr_weak_type):
        Correct type of macro value.
        (shared_ptr): Add additional friend declarations.
        (make_shared, allocate_shared): Constrain existing overloads and
        remove static_assert.
        * include/bits/shared_ptr_base.h (__cpp_lib_smart_ptr_for_overwrite):
        New macro.
        (_Sp_counted_ptr_inplace<T, Alloc, Lp>): New partial
        specialization for use with make_shared_for_overwrite.
        (__cpp_lib_shared_ptr_arrays): Update value for C++20.
        (_Sp_counted_array_base): New class template.
        (_Sp_counted_array): New class template.
        (__shared_count(_Tp*&, const _Sp_counted_array_base&, _Init)):
        New constructor for allocating shared arrays.
        (__shared_ptr(const _Sp_counted_array_base&, _Init)): Likewise.
        * include/std/version (__cpp_lib_shared_ptr_weak_type): Correct
        type.
        (__cpp_lib_shared_ptr_arrays): Update value for C++20.
        (__cpp_lib_smart_ptr_for_overwrite): New macro.
        * testsuite/20_util/shared_ptr/creation/99006.cc: Adjust
        expected errors.
        * testsuite/20_util/shared_ptr/creation/array.cc: New test.
        * testsuite/20_util/shared_ptr/creation/overwrite.cc: New test.
        * testsuite/20_util/shared_ptr/creation/version.cc: New test.
        * testsuite/20_util/unique_ptr/creation/for_overwrite.cc: Check
        feature test macro. Test non-trivial default-initialization.

2022-01-14  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/stl_construct.h (_Construct, _Construct_novalue):
        Also cast away cv-qualifiers when converting pointer to void.
        * testsuite/20_util/allocator/void.cc: Test construct function
        with cv-qualified types.

2022-01-14  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/103992
        * include/bits/stl_iterator.h (common_iterator): Use
        std::construct_at instead of placement new.
        * testsuite/24_iterators/common_iterator/1.cc: Check copy
        construction is usable in constant expressions.

2022-01-14  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/status_cxx2011.xml: Document new tokens
        accepted by std::random_device constructor.
        * doc/html/manual/status.html: Regenerate.

2022-01-12  Patrick Palka  <ppalka@redhat.com>

        * testsuite/20_util/to_chars/103955.cc: Add explicit dg-do
        directive.

2022-01-12  Patrick Palka  <ppalka@redhat.com>

        PR libstdc++/103955
        * src/c++17/floating_to_chars.cc (__floating_to_chars_hex):
        Track the excess precision separately from the effective
        precision.  Avoid overflow in bounds check by splitting it into
        two checks.
        (__floating_to_chars_precision): Avoid overflow in bounds checks
        similarly.
        * testsuite/20_util/to_chars/103955.cc: New test.

2022-01-11  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/103726
        * include/Makefile.am: Install <source_location> for
        freestanding.
        * include/Makefile.in: Regenerate.
        * include/std/version (__cpp_lib_source_location): Define for
        freestanding.

2022-01-11  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/ranges (ranges::lazy_split_view::_InnerIter::end()):
        Add neoxcept (LWG 3593).

2022-01-11  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/ranges (ranges::__detail::__box): Add constexpr to
        assignment operators (LWG 3572).
        * testsuite/std/ranges/adaptors/filter.cc: Check assignment of a
        view that uses copyable-box.

2022-01-11  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/103726
        * include/Makefile.am: Install <coroutine> for freestanding.
        * include/Makefile.in: Regenerate.
        * include/std/coroutine: Adjust headers and preprocessor
        conditions.
        (__coroutine_traits_impl): Use concepts when available.
        [_GLIBCXX_HOSTED] (hash<coroutine_handle>): Define.

2022-01-11  Jonathan Wakely  <jwakely@redhat.com>

        * include/std/ostream (operator<<(basic_ostream&, charT)):
        Use unformatted input if no padding is needed.
        (operator<<(basic_ostream<char>&, char)): Likewise.

2022-01-11  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/103891
        * include/bits/c++config (_GLIBCXX_HAVE_COND_TRIVIAL_SPECIAL_MEMBERS):
        Define.
        * include/std/variant (__cpp_lib_variant): Only define C++20
        value when the compiler is known to support conditionally
        trivial destructors.
        * include/std/version (__cpp_lib_variant): Likewise.

2022-01-11  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/stl_iterator.h (common_iterator): Add constexpr
        to all member functions (LWG 3574).
        * testsuite/24_iterators/common_iterator/1.cc: Evaluate some
        tests as constant expressions.
        * testsuite/24_iterators/common_iterator/2.cc: Likewise.

2022-01-10  Jakub Jelinek  <jakub@redhat.com>

        PR libstdc++/77760
        * include/bits/locale_facets_nonio.h (__time_get_state): New struct.
        (time_get::_M_extract_via_format): Declare new method with
        __time_get_state& as an extra argument.
        * include/bits/locale_facets_nonio.tcc (_M_extract_via_format): Add
        __state argument, set various fields in it while parsing.  Handle %j,
        %U, %w and %W, fix up handling of %y, %Y and %C, don't adjust tm_hour
        for %p immediately.  Add a wrapper around the method without the
        __state argument for backwards compatibility.
        (_M_extract_num): Remove all __len == 4 special cases.
        (time_get::do_get_time, time_get::do_get_date, time_get::do_get): Zero
        initialize __state, pass it to _M_extract_via_format and finalize it
        at the end.
        (do_get_year): For 1-2 digit parsed years, map 0-68 to 2000-2068,
        69-99 to 1969-1999.  For 3-4 digit parsed years use that as year.
        (get): If do_get isn't overloaded from the locale_facets_nonio.tcc
        version, don't call do_get but call _M_extract_via_format instead to
        pass around state.
        * config/abi/pre/gnu.ver (GLIBCXX_3.4.30): Export _M_extract_via_format
        with extra __time_get_state and __time_get_state::_M_finalize_state.
        * src/c++98/locale_facets.cc (is_leap, day_of_the_week,
        day_of_the_year): New functions in anon namespace.
        (mon_yday): New var in anon namespace.
        (__time_get_state::_M_finalize_state): Define.
        * testsuite/22_locale/time_get/get/char/4.cc: New test.
        * testsuite/22_locale/time_get/get/wchar_t/4.cc: New test.
        * testsuite/22_locale/time_get/get_year/char/1.cc (test01): Parse 197
        as year 197AD instead of error.
        * testsuite/22_locale/time_get/get_year/char/5.cc (test01): Parse 1 as
        year 2001 instead of error.
        * testsuite/22_locale/time_get/get_year/char/6.cc: New test.
        * testsuite/22_locale/time_get/get_year/wchar_t/1.cc (test01): Parse
        197 as year 197AD instead of error.
        * testsuite/22_locale/time_get/get_year/wchar_t/5.cc (test01): Parse
        1 as year 2001 instead of error.
        * testsuite/22_locale/time_get/get_year/wchar_t/6.cc: New test.

2022-01-10  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/103866
        * acinclude.m4 (GLIBCXX_COMPUTE_STDIO_INTEGER_CONSTANTS): Do
        nothing for freestanding builds.
        (GLIBCXX_ENABLE_HOSTED): Define FREESTANDING_FLAGS.
        * configure.ac: Do not use AC_LIBTOOL_DLOPEN when configured
        with --without-headers.  Do not use GCC_HEADER_STDINT for
        freestanding builds.
        * libsupc++/Makefile.am (HOSTED_CXXFLAGS): Use -ffreestanding
        for freestanding builds.
        * configure: Regenerate.
        * Makefile.in: Regenerate.
        * doc/Makefile.in: Regenerate.
        * include/Makefile.in: Regenerate.
        * libsupc++/Makefile.in: Regenerate.
        * po/Makefile.in: Regenerate.
        * python/Makefile.in: Regenerate.
        * src/Makefile.in: Regenerate.
        * src/c++11/Makefile.in: Regenerate.
        * src/c++17/Makefile.in: Regenerate.
        * src/c++20/Makefile.in: Regenerate.
        * src/c++98/Makefile.in: Regenerate.
        * src/filesystem/Makefile.in: Regenerate.
        * testsuite/Makefile.in: Regenerate.

2022-01-10  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/28_regex/algorithms/regex_replace/char/103664.cc:
        Add dg-timeout-factor directive.
        * testsuite/28_regex/basic_regex/84110.cc: Likewise.
        * testsuite/28_regex/basic_regex/ctors/char/other.cc: Likewise.
        * testsuite/28_regex/match_results/102667.cc: Likewise.

2022-01-10  Jonathan Wakely  <jwakely@redhat.com>

        * doc/xml/manual/using.xml: Update documentation around default
        -std option.
        * doc/html/*: Regenerate.

2022-01-10  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/100017
        * src/c++17/Makefile.am (AM_CXXFLAGS): Add -nostdinc++.
        * src/c++17/Makefile.in: Regenerate.

2022-01-09  Sandra Loosemore  <sandra@codesourcery.com>

        * testsuite/18_support/type_info/constexpr.cc: Add explicit
        -fdelete-null-pointer-checks option.

2022-01-06  Pavel I. Kryukov  <pavel.kryukov@phystech.edu>
            Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/103853
        * include/bits/forward_list.tcc (forward_list::merge): Check for
        self-merge.
        * testsuite/23_containers/forward_list/operations/merge.cc: New test.

2022-01-06  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/regex.h (basic_regex, match_results): Qualify
        name in friend declaration, to work around Clang bug.

2022-01-06  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/ext/rope/pthread7-rope.cc: Add dg-timeout-factor.

2022-01-06  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/103911
        * include/std/charconv (__from_chars_alpha_to_num): Return
        char instead of unsigned char. Change invalid return value to
        127 instead of using numeric trait.
        (__from_chars_alnum): Fix comment. Do not use std::isdigit.
        Change type of variable to char.

2022-01-05  François Dumont  <fdumont@gcc.gnu.org>

        PR libstdc++/68303
        * include/bits/hashtable_policy.h
        (_Hashtable_hash_traits<_Hash>): New.
        (_Hash_code_base<>::_M_hash_code(const _Hash_node_value<>&)): New.
        (_Hashtable_base<>::_M_key_equals): New.
        (_Hashtable_base<>::_M_equals): Use latter.
        (_Hashtable_base<>::_M_key_equals_tr): New.
        (_Hashtable_base<>::_M_equals_tr): Use latter.
        * include/bits/hashtable.h
        (_Hashtable<>::__small_size_threshold()): New, use _Hashtable_hash_traits.
        (_Hashtable<>::find): Loop through elements to look for key if size is lower
        than __small_size_threshold().
        (_Hashtable<>::_M_emplace(true_type, _Args&&...)): Likewise.
        (_Hashtable<>::_M_insert_unique(_Kt&&, _Args&&, const _NodeGenerator&)): Likewise.
        (_Hashtable<>::_M_compute_hash_code(const_iterator, const key_type&)): New.
        (_Hashtable<>::_M_emplace(const_iterator, false_type, _Args&&...)): Use latter.
        (_Hashtable<>::_M_find_before_node(const key_type&)): New.
        (_Hashtable<>::_M_erase(true_type, const key_type&)): Use latter.
        (_Hashtable<>::_M_erase(false_type, const key_type&)): Likewise.
        * src/c++11/hashtable_c++0x.cc: Include <bits/functional_hash.h>.
        * testsuite/util/testsuite_performance.h
        (report_performance): Use 9 width to display memory.
        * testsuite/performance/23_containers/insert_erase/unordered_small_size.cc:
        New performance test case.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/103919
        * include/bits/basic_string.h (basic_string(const T&, size_t, size_t)):
        Relax constraints on string_view parameter.
        * include/bits/cow_string.h (basic_string(const T&, size_t, size_t)):
        Likewise.
        * testsuite/21_strings/basic_string/cons/char/103919.cc: New test.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

        * config/abi/pre/gnu.ver (GLIBCXX_3.4.30): Export new symbol for
        ARM EABI.
        * include/bits/c++config (_GLIBCXX23_CONSTEXPR): Define.
        * include/std/version (__cpp_lib_constexpr_typeinfo): Define.
        * libsupc++/tinfo.cc: Add #error to ensure non-inline definition
        is emitted.
        (type_info::__equal): Define alias symbol.
        * libsupc++/typeinfo (type_info::before): Combine different
        implementations into one.
        (type_info::operator==): Likewise. Use address equality for
        constant evaluation. Call __equal for targets that require the
        definition to be non-inline.
        * testsuite/18_support/type_info/constexpr.cc: New test.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

        * src/c++11/cxx11-ios_failure.cc (io_error_category): Define
        class and virtual functions as 'final'.
        (io_category_instance): Use constinit union to make the object
        immortal.
        * src/c++11/future.cc (future_error_category): Define class and
        virtual functions as 'final'.
        (future_category_instance): Use constinit union.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

        * python/libstdcxx/v6/printers.py (StdErrorCodePrinter): Strip
        versioned namespace from the type name that is printed.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

        * python/libstdcxx/v6/printers.py (StdRegexStatePrinter): New
        printer for std::regex NFA states.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/23_containers/forward_list/operations/1.cc: Fill in
        placeholders in comments.
        * testsuite/23_containers/forward_list/operations/2.cc:
        Likewise.
        * testsuite/23_containers/forward_list/operations/3.cc:
        Likewise.
        * testsuite/23_containers/forward_list/operations/4.cc:
        Likewise.
        * testsuite/23_containers/forward_list/operations/5.cc:
        Likewise.
        * testsuite/23_containers/forward_list/operations/6.cc:
        Likewise.
        * testsuite/23_containers/forward_list/operations/7.cc:
        Likewise.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/103848
        * include/bits/stl_deque.h (operator-): Do not use 0 as null
        pointer constant.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/alloc_traits.h (allocator_traits<allocator<void>>):
        Use std::_Construct for construct.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/103877
        * doc/xml/faq.xml: Add '-x c++' to preprocessor command.
        * doc/html/faq.html: Regenerate.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/regex.h (__regex_algo_impl): Change __policy and
        __match_mode template parameters to be function parameters.
        (regex_match, regex_search): Pass policy and match mode as
        function arguments.
        * include/bits/regex.tcc (__regex_algo_impl): Change template
        parameters to function parameters.
        * include/bits/regex_compiler.h (_RegexTranslatorBase): Use
        'if constexpr' for conditions using template parameters.
        (_RegexTranslator): Likewise.
        * include/bits/regex_executor.tcc (_Executor::_M_handle_accept):
        Likewise.
        * testsuite/util/testsuite_regex.h (regex_match_debug)
        (regex_search_debug): Move template arguments to function
        arguments.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

        * testsuite/util/testsuite_regex.h (regex_match_debug): Compare
        results even if the match failed.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

        * include/bits/regex_compiler.tcc: Adjust all calls to
        __throw_regex_error.
        * include/bits/regex_error.h (__throw_regex_error): Add noreturn
        attribute.
        * include/bits/regex_scanner.tcc: Likewise.
        * src/c++11/regex.cc (desc): New helper function.
        (regex_error::regex_error(error_type)): Use desc to get a string
        corresponding to the error code.

\f
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