[PATCH] libsupc++: try cxa_thread_atexit_impl at runtime

[Alexandre Oliva]

On Nov  9, 2023, Jonathan Wakely <jwakely@redhat.com> wrote:

> On Thu, 9 Nov 2023 at 01:56, Alexandre Oliva <oliva@adacore.com> wrote:

>> 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
>> platforms that support weak symbols.
>> 
>> Regstrapped on x86_64-linux-gnu, also tested with gcc-13 on i686- and
>> x86_64-, and with ac_cv_func___cxa_thread_atexit_impl=no, that, on a
>> distro that lacks __cxa_thread_atexit in libc, forces the newly-added
>> code to be exercised, and that enabled thread_local-order2.C to pass
>> where the runtime libc has __cxa_thread_atexit_impl.  Ok to install?

> Seems fine to me. Any objections, Jason?

Jason, ping?
https://gcc.gnu.org/pipermail/gcc-patches/2023-November/635750.html

-- 
Alexandre Oliva, happy hacker            https://FSFLA.org/blogs/lxo/
   Free Software Activist                   GNU Toolchain Engineer
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