[Bug c++/102350] __builtin_source_location not available in earlier language modes

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102350

--- Comment #19 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #14)
> As for std::experimental::source_location, could we change ABI of those?

Yes, we don't promise stability between major releases for the experimental
stuff (although in practice it doesn't change).