[Bug libstdc++/112858] [14 Regression] nvptx: 'unresolved symbol __cxa_thread_atexit_impl'

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112858

--- Comment #7 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Alexandre Oliva <aoliva@gcc.gnu.org>:

https://gcc.gnu.org/g:3d0f3382fa7b5677f35a9becf75ac436cd7eda7b

commit r14-6261-g3d0f3382fa7b5677f35a9becf75ac436cd7eda7b
Author: Alexandre Oliva <oliva@adacore.com>
Date:   Thu Dec 7 00:38:14 2023 -0300

    libsupc++: try cxa_thread_atexit_impl at runtime

    g++.dg/tls/thread_local-order2.C fails when the toolchain is built for
    a platform that lacks __cxa_thread_atexit_impl, even if the program is
    built and run using that toolchain on a (later) platform that offers
    __cxa_thread_atexit_impl.

    This patch adds runtime testing for __cxa_thread_atexit_impl on select
    platforms (GNU variants, for starters) that support weak symbols.


    for  libstdc++-v3/ChangeLog

            PR libstdc++/112858
            * config/os/gnu-linux/os_defines.h
            (_GLIBCXX_MAY_HAVE___CXA_THREAD_ATEXIT_IMPL): Define.
            * libsupc++/atexit_thread.cc [__GXX_WEAK__ &&
            _GLIBCXX_MAY_HAVE___CXA_THREAD_ATEXIT_IMPL]
            (__cxa_thread_atexit): Add dynamic detection of
            __cxa_thread_atexit_impl.