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Subject: [Bug libstdc++/102270] std::tuple<>::swap missing constexpr specifier
Date: Fri, 26 Nov 2021 16:34:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102270

--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Jonathan Wakely
<redi@gcc.gnu.org>:

https://gcc.gnu.org/g:b3f135a50c3dd7fc04252e17d7fbb08ca95aa9a5

commit r10-10307-gb3f135a50c3dd7fc04252e17d7fbb08ca95aa9a5
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Sep 15 21:53:35 2021 +0100

    libstdc++: Add missing 'constexpr' to std::tuple [PR102270]

    This backport to gcc-10 also includes r12-3637.

    Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

    libstdc++-v3/ChangeLog:

            PR libstdc++/102270
            * include/std/tuple (_Head_base, _Tuple_impl): Add
            _GLIBCXX20_CONSTEXPR to allocator-extended constructors.
            (tuple<>::swap(tuple&)): Add _GLIBCXX20_CONSTEXPR.
            * testsuite/20_util/tuple/cons/102270.cc: New test.
            * testsuite/util/testsuite_allocator.h (SimpleAllocator): Add
            constexpr to constructor so it can be used for C++20 tests.=