[Bug testsuite/100748] [12 regression] 30_threads/jthread/95989.cc fails after r12-843

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100748

--- Comment #12 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:18eecb8c4a97716d4bc4890b05c91f172fadc7b3

commit r10-10928-g18eecb8c4a97716d4bc4890b05c91f172fadc7b3
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Nov 9 23:45:36 2021 +0000

    libstdc++: Disable gthreads weak symbols for glibc 2.34 [PR103133]

    Since Glibc 2.34 all pthreads symbols are defined directly in libc not
    libpthread, and since Glibc 2.32 we have used __libc_single_threaded to
    avoid unnecessary locking in single-threaded programs. This means there
    is no reason to avoid linking to libpthread now, and so no reason to use
    weak symbols defined in gthr-posix.h for all the pthread_xxx functions.

    libstdc++-v3/ChangeLog:

            PR libstdc++/100748
            PR libstdc++/103133
            * config/os/gnu-linux/os_defines.h (_GLIBCXX_GTHREAD_USE_WEAK):
            Define for glibc 2.34 and later.

    (cherry picked from commit 80fe172ba9820199c2bbce5d0611ffca27823049)