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

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

        * include/bits/random.tcc (operator==): Only check
        normal_distribution::_M_saved_available once.
        * testsuite/26_numerics/random/normal_distribution/operators/equal.cc:
        Check equality after state changes.
        * testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error
        lineno.

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  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.

2022-05-06  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>

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

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

        PR libstdc++/99871
        * include/bits/specfun.h: Use visibility attribute on namespace,
        instead of pragma push/pop.
        * libsupc++/compare: Likewise.
        * libsupc++/exception: Likewise.
        * libsupc++/exception.h: Likewise.
        * libsupc++/exception_ptr.h: Likewise.
        * libsupc++/initializer_list: Likewise.
        * libsupc++/nested_exception.h: Likewise.

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

        * doc/xml/manual/test.xml: Remove requirement for copyright and
        GPL notice in tests.
        * doc/html/manual/test.html: Regenerate.

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

        * include/experimental/memory_resource [!__cpp_rtti]
        (__resource_adaptor_imp::do_is_equal): Do not use dynamic_cast
        when RTTI is disabled.
        * testsuite/17_intro/freestanding.cc: Require RTTI.
        * testsuite/18_support/exception/38732.cc: Likewise.
        * testsuite/18_support/exception_ptr/rethrow_exception.cc:
        Likewise.
        * testsuite/18_support/nested_exception/68139.cc: Likewise.
        * testsuite/18_support/nested_exception/rethrow_if_nested.cc:
        Likewise.
        * testsuite/18_support/type_info/103240.cc: Likewise.
        * testsuite/18_support/type_info/fundamental.cc: Likewise.
        * testsuite/18_support/type_info/hash_code.cc: Likewise.
        * testsuite/20_util/any/assign/emplace.cc: Likewise.
        * testsuite/20_util/any/cons/in_place.cc: Likewise.
        * testsuite/20_util/any/misc/any_cast.cc: Likewise.
        * testsuite/20_util/any/observers/type.cc: Likewise.
        * testsuite/20_util/function/1.cc: Likewise.
        * testsuite/20_util/function/2.cc: Likewise.
        * testsuite/20_util/function/3.cc: Likewise.
        * testsuite/20_util/function/4.cc: Likewise.
        * testsuite/20_util/function/5.cc: Likewise.
        * testsuite/20_util/function/6.cc: Likewise.
        * testsuite/20_util/function/7.cc: Likewise.
        * testsuite/20_util/function/8.cc: Likewise.
        * testsuite/20_util/polymorphic_allocator/resource.cc: Likewise.
        * testsuite/20_util/shared_ptr/casts/1.cc: Likewise.
        * testsuite/20_util/shared_ptr/casts/rval.cc: Likewise.
        * testsuite/20_util/shared_ptr/cons/unique_ptr_deleter_ref_2.cc:
        Likewise.
        * testsuite/20_util/shared_ptr/misc/get_deleter.cc: Likewise.
        * testsuite/20_util/typeindex/comparison_operators.cc: Likewise.
        * testsuite/20_util/typeindex/comparison_operators_c++20.cc:
        Likewise.
        * testsuite/20_util/typeindex/hash.cc: Likewise.
        * testsuite/20_util/typeindex/hash_code.cc: Likewise.
        * testsuite/20_util/typeindex/name.cc: Likewise.
        * testsuite/22_locale/ctype/is/string/89728_neg.cc: Likewise.
        * testsuite/22_locale/global_templates/standard_facet_hierarchies.cc:
        Likewise.
        * testsuite/22_locale/global_templates/user_facet_hierarchies.cc:
        Likewise.
        * testsuite/22_locale/locale/13630.cc: Check type without using
        RTTI.
        * testsuite/23_containers/array/requirements/non_default_constructible.cc:
        Require RTTI.
        * testsuite/27_io/basic_ostream/emit/1.cc: Likewise.
        * testsuite/27_io/fpos/14320-1.cc: Check type without using RTTI.
        * testsuite/27_io/fpos/mbstate_t/12065.cc: Require RTTI.
        * testsuite/27_io/ios_base/failure/dual_abi.cc: Likewise.
        * testsuite/experimental/any/misc/any_cast.cc: Likewise.
        * testsuite/experimental/any/observers/type.cc: Likewise.
        * testsuite/experimental/memory_resource/resource_adaptor.cc:
        Likewise.
        * testsuite/lib/libstdc++.exp (check_effective_target_rtti):
        Define new proc.
        * testsuite/tr1/3_function_objects/function/1.cc: Likewise.
        * testsuite/tr1/3_function_objects/function/2.cc: Likewise.
        * testsuite/tr1/3_function_objects/function/3.cc: Likewise.
        * testsuite/tr1/3_function_objects/function/4.cc: Likewise.
        * testsuite/tr1/3_function_objects/function/5.cc: Likewise.
        * testsuite/tr1/3_function_objects/function/6.cc: Likewise.
        * testsuite/tr1/3_function_objects/function/7.cc: Likewise.
        * testsuite/tr1/3_function_objects/function/8.cc: Likewise.
        * testsuite/tr2/bases/value.cc: Likewise.
        * testsuite/tr2/direct_bases/value.cc: Likewise.
        * testsuite/util/exception/safety.h [!__cpp_rtti]: Don't print
        types without RTTI.

2022-05-04  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104719
        * include/std/array (array::size(), array::max_size())
        (array::empty(), array::data()): Add  always_inline attribute.

2022-05-04  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/104719
        * include/std/array (__array_traits::_S_ref): Remove.
        (__array_traits::_S_ptr): Remove.
        (__array_traits<T, 0>::_Type): Define operator[] and operator T*
        to provide an array-like API.
        (array::_AT_Type): Remove public typeef.
        (array::operator[], array::at, array::front, array::back): Use
        index operator to access _M_elems instead of _S_ref.
        (array::data): Use implicit conversion from _M_elems to pointer.
        (swap(array&, array&)): Use __enable_if_t helper.
        (get<I>): Use index operator to access _M_elems.
        * testsuite/23_containers/array/tuple_interface/get_neg.cc:
        Adjust dg-error line numbers.

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.

2022-05-02  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.

2022-05-02  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>

        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>

        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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