https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113960
--- Comment #18 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-12 branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:6f5dcea85a31845ec6f4b6886734b0f02e013718 commit r12-10251-g6f5dcea85a31845ec6f4b6886734b0f02e013718 Author: Jonathan Wakely <jwak...@redhat.com> Date: Tue Feb 27 17:50:34 2024 +0000 libstdc++: Fix conditions for using memcmp in std::lexicographical_compare_three_way [PR113960] The change in r11-2981-g2f983fa69005b6 meant that std::lexicographical_compare_three_way started to use memcmp for unsigned integers on big endian targets, but for that to be valid we need the two value types to have the same size and we need to use that size to compute the length passed to memcmp. I already defined a __is_memcmp_ordered_with trait that does the right checks, std::lexicographical_compare_three_way just needs to use it. libstdc++-v3/ChangeLog: PR libstdc++/113960 * include/bits/stl_algobase.h (__is_byte_iter): Replace with ... (__memcmp_ordered_with): New concept. (lexicographical_compare_three_way): Use __memcmp_ordered_with instead of __is_byte_iter. Use correct length for memcmp. * testsuite/25_algorithms/lexicographical_compare_three_way/113960.cc: New test. (cherry picked from commit f5cdda8acb06c20335855ed353ab9a441c12128a)
