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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libgcc/114646] libgcc's gthr.h still defines GTHREAD_USE_WEAK
 to 1 for newer glibc
Date: Mon, 08 Apr 2024 20:18:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114646

--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
r12-5108

commit 80fe172ba9820199c2bbce5d0611ffca27823049
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.

fixed static C++ pthread programs.  libgfortran neeeds a similar fix.=