[Bug c++/104712] -fkeep-inline-functions causing link errors (debian but not godbolt?)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104712

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
You only have a declaration and not a definition.
You need to add:
int C::XYZZY;

And that will fix the issue you are seeing.