[Bug middle-end/99612] Remove "#pragma GCC system_header" from atomic file to warn on incorrect memory order

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99612

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Martin Sebor <mse...@gcc.gnu.org>:

https://gcc.gnu.org/g:5a431b60d1f221992e5e9f7a5c032df3b5fa35a5

commit r12-6216-g5a431b60d1f221992e5e9f7a5c032df3b5fa35a5
Author: Martin Sebor <mse...@redhat.com>
Date:   Tue Jan 4 13:44:23 2022 -0700

    Eenable -Winvalid-memory-order for C++ [PR99612].

    Resolves:
    PR middle-end/99612 - Remove "#pragma GCC system_header" from atomic file
to warn on incorrect memory order

    gcc/ChangeLog:

            PR middle-end/99612
            * builtins.c (get_memmodel): Move warning code to
            gimple-ssa-warn-access.cc.
            (expand_builtin_atomic_compare_exchange): Same.
            (expand_ifn_atomic_compare_exchange): Same.
            (expand_builtin_atomic_load): Same.
            (expand_builtin_atomic_store): Same.
            (expand_builtin_atomic_clear): Same.
            * doc/extend.texi (__atomic_exchange_n): Update valid memory
            models.
            * gimple-ssa-warn-access.cc (memmodel_to_uhwi): New function.
            (struct memmodel_pair): New struct.
            (memmodel_name): New function.
            (pass_waccess::maybe_warn_memmodel): New function.
            (pass_waccess::check_atomic_memmodel): New function.
            (pass_waccess::check_atomic_builtin): Handle memory model.
            * input.c (expansion_point_location_if_in_system_header): Return
            original location if expansion location is in a system header.

    gcc/testsuite/ChangeLog:

            PR middle-end/99612
            * c-c++-common/pr83059.c: Adjust text of expected diagnostics.
            * gcc.dg/atomic-invalid-2.c: Same.
            * gcc.dg/atomic-invalid.c: Same.
            * c-c++-common/Winvalid-memory-model.c: New test.
            * g++.dg/warn/Winvalid-memory-model-2.C: New test.
            * g++.dg/warn/Winvalid-memory-model.C: New test.