[Bug c++/67519] warn for calls to member functions before all base classes constructed

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67519

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Markus Trippelsdorf from comment #2)
> Also -fsanitize=undefined doesn't handle this issue yet.

It does if there is a vtable.