https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102350
--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> --- That is not possible, because std::source_location::current() should be consteval and it can't be in C++ < 20, and without consteval it will behave significantly differently. Note, the C++ FE knows std::source_location::current() and has magic behavior for it, just consteval semantics is not enough. And by providing std::source_location without the current method for C++ < 20 there would be no way to initialize it to __builtin_source_location (), std::source_location::__impl is private...
