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Subject: [Bug libstdc++/105844] [10/11 Regression] std::lcm(50000, 49999) is
 UB but accepted in a constexpr due to cast to unsigned
Date: Wed, 03 May 2023 15:16:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105844

--- Comment #12 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Jonathan Wakely
<redi@gcc.gnu.org>:

https://gcc.gnu.org/g:ad076469c00af1fbe2f848844ab5937587772a70

commit r11-10740-gad076469c00af1fbe2f848844ab5937587772a70
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed May 3 16:05:23 2023 +0100

    libstdc++: Fix broken backport for std::lcm [PR105844]

    The backport for gcc-11 was incomplete and should have replaced all uses
    of std::__is_constant_evaluated with __builtin_is_constant_evaluated.

    We also need to prune some additional output for the new tests, because
    the r12-4425-g1595fe44e11a96 change to always prune those lines is not
    present on the branch.

    libstdc++-v3/ChangeLog:

            PR libstdc++/105844
            * include/experimental/numeric (lcm): Use built-in instead of
            __is_constant_evaluated.
            * include/std/numeric (__abs_r, lcm): Likewise.
            * testsuite/26_numerics/gcd/105844.cc: Add dg-prune-output.
            * testsuite/26_numerics/lcm/105844.cc: Likewise.=