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Subject: [Bug libstdc++/100179] [12 regression] xtreme-header-2_a.H fails on
 arm-eabi
Date: Thu, 22 Apr 2021 12:59:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100179

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:4b2db8077136d2f8b5a0db026e6161810be327b3

commit r12-59-g4b2db8077136d2f8b5a0db026e6161810be327b3
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Apr 22 11:10:06 2021 +0100

    libstdc++: Remove #error from <semaphore> implementation [PR 100179]

    This removes the #error from <bits/semaphore_base.h> for the case where
    neither __atomic_semaphore nor __platform_semaphore is defined.

    Also rename the _GLIBCXX_REQUIRE_POSIX_SEMAPHORE macro to
    _GLIBCXX_USE_POSIX_SEMAPHORE for consistency with the similar
    _GLIBCXX_USE_CXX11_ABI macro that can be used to request an alternative
    (ABI-changing) implementation.

    libstdc++-v3/ChangeLog:

            PR libstdc++/100179
            * include/bits/semaphore_base.h: Remove #error.
            * include/std/semaphore: Do not define anything unless one of
            the implementations is available.=