[Bug other/42540] c++ error message [vtable undefined] is unhelpful

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42540

--- Comment #20 from Jonathan Wakely <redi at gcc dot gnu.org> ---
No, but "the first non-pure, non-inline virtual function in the class" is easy
for the user to find.