[Bug sanitizer/97868] warn about using fences with TSAN

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97868

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Martin Liska <mar...@gcc.gnu.org>:

https://gcc.gnu.org/g:8833eab4461b4b7050f06a231c3311cc1fa87523

commit r11-6112-g8833eab4461b4b7050f06a231c3311cc1fa87523
Author: Martin Liska <mli...@suse.cz>
Date:   Mon Dec 7 15:55:59 2020 +0100

    Add -Wtsan.

    gcc/ChangeLog:

            PR sanitizer/97868
            * common.opt: Add new warning -Wtsan.
            * doc/invoke.texi: Likewise.
            * tsan.c (instrument_builtin_call): Warn users about unsupported
            std::atomic_thread_fence.

    gcc/testsuite/ChangeLog:

            PR sanitizer/97868
            * gcc.dg/tsan/atomic-fence.c: New test.