[Bug c++/67155] Linking of complex constexpr static class member failing across files

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67155

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
https://gcc.gnu.org/wiki/VerboseDiagnostics#missing_static_const_definition