https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94933
--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-10 branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:8836c35d5d6fefa514cb78cb6800670869fb1df2 commit r10-8135-g8836c35d5d6fefa514cb78cb6800670869fb1df2 Author: Jonathan Wakely <jwak...@redhat.com> Date: Tue May 12 09:54:24 2020 +0100 libstdc++: Make byte-sized std::fill_n a constant expression (PR 94933) The overload for byte types uses memset and isn't constexpr. This adds the specifier and uses std::is_constant_evaluated() to provide a compile-time alternative. Backport from mainline 2020-05-03 Jonathan Wakely <jwak...@redhat.com> PR libstdc++/94933 * include/bits/stl_algobase.h (__fill_a1): Make overload for byte types usable in constant expressions. * testsuite/25_algorithms/fill_n/constexpr.cc: Test with bytes and non-scalars.
