https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115668
--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-14 branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:d5e352addf4c17d28bcada42409881089c5d8088 commit r14-10356-gd5e352addf4c17d28bcada42409881089c5d8088 Author: Jonathan Wakely <jwak...@redhat.com> Date: Wed Jun 26 20:22:54 2024 +0100 libstdc++: Fix std::format for chrono::duration with unsigned rep [PR115668] Using std::chrono::abs is only valid if numeric_limits<rep>::is_signed is true, so using it unconditionally made it ill-formed to format a duration with an unsigned rep. The duration formatter might as well negate the duration itself instead of using chrono::abs, because it already needs to check for a negative value. libstdc++-v3/ChangeLog: PR libstdc++/115668 * include/bits/chrono_io.h (formatter<duration<R,P, C>::format): Do not use chrono::abs. * testsuite/20_util/duration/io.cc: Check formatting a duration with unsigned rep. (cherry picked from commit dafa750c8a6f0a088677871bfaad054881737ab1)
