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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
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 20:59:47 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105844

--- Comment #15 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Jonathan Wakely
<redi@gcc.gnu.org>:

https://gcc.gnu.org/g:b357af31b8d1e93f0f70133e25d3ad4045f7a32b

commit r10-11389-gb357af31b8d1e93f0f70133e25d3ad4045f7a32b
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed May 3 21:40:01 2023 +0100

    libstdc++: Ensure constexpr std::lcm detects out-of-range result [PR105=
844]

    On the gcc-10 branch, __glibcxx_assert does not unconditionally check
    the condition during constant evaluation. This means we need an explicit
    additional check for std::lcm results that cannot be represented in an
    unsigned result type.

    libstdc++-v3/ChangeLog:

            PR libstdc++/105844
            * include/std/numeric (lcm): Ensure out-of-range result is
            detected in constant evaluation.
            * testsuite/26_numerics/lcm/105844.cc: Adjust dg-error string.=