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Subject: [Bug libstdc++/109339] [12 Regression] stop_token compiled with -Og
 yields maybe-uninitialized
Date: Thu, 27 Apr 2023 14:43:55 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109339

--- Comment #14 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Jonathan Wakely
<redi@gcc.gnu.org>:

https://gcc.gnu.org/g:47880309516fd5c913102eb4c52dc86da7051983

commit r12-9486-g47880309516fd5c913102eb4c52dc86da7051983
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Mar 31 13:38:14 2023 +0100

    libstdc++: Avoid -Wmaybe-uninitialized warning in std::stop_source
[PR109339]

    We pass a const-reference to *this before it's constructed, and GCC
    assumes that all const-references are accessed. Add the access attribute
    to say it's not accessed.

    libstdc++-v3/ChangeLog:

            PR libstdc++/109339
            * include/std/stop_token (_Stop_state_ptr(const stop_source&)):
            Add attribute access with access-mode 'none'.
            * testsuite/30_threads/stop_token/stop_source/109339.cc: New te=
st.

    (cherry picked from commit a35e8042fbc7a3eb9cece1fba4cdd3b6cdfb906f)=