[Bug c++/113658] GCC 14 has incomplete impl for declared feature "cxx_constexpr_string_builtins"

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113658

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Newer libc++ does the "correct" thing even:
https://github.com/llvm/llvm-project/blob/430c1fd50d774dc30a9628bcf60ce243f74ff376/libcxx/include/__string/constexpr_c_functions.h#L121