https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114646
--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
r12-5108
commit 80fe172ba9820199c2bbce5d0611ffca27823049
Author: Jonathan Wakely <jwak...@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.
