https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80265
--- Comment #22 from Jonathan Wakely <redi at gcc dot gnu.org> --- No, it worked around it by implementing char_traits a different way. We also use these functions in <algorithm>, e.g. std::equal uses __builtin_memcmp, and that needs to be constexpr too. We could keep using Pedro's trick everywhere, but it's not very scalable.
