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Subject: [Bug libstdc++/96766] std::swap(std::variant, std::variant) triggers
 undefined behavior sanitizer
Date: Tue, 19 Jul 2022 13:56:55 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96766

--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:20ab3972240aff596a3fa98e9fb09ddc0658fbb3

commit r13-1749-g20ab3972240aff596a3fa98e9fb09ddc0658fbb3
Author: Marco Falke <falke.marco@gmail.com>
Date:   Tue Jul 19 10:10:39 2022 +0100

    libstdc++: Make __from_chars_alnum_to_val conversion explicit

    The optimizations from commit r12-8175-ga54137c88061c7 introduced a
    clang integer sanitizer error.

    Fix this with an explicit static_cast, similar to the fix for PR 96766.

    libstdc++-v3/ChangeLog:

            * include/std/charconv (__from_chars_alnum_to_val): Replace
            implicit conversion from int to unsigned char with explicit
            cast.=