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

["eyalroz1 at gmx dot com" <gcc-bugzilla@gcc.gnu.org>]

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

--- Comment #21 from Eyal Rozenberg <eyalroz1 at gmx dot com> ---
(In reply to Jonathan Wakely from comment #20)
> No, but "the first non-pure, non-inline virtual function in the class" is
> easy for the user to find.

Well, yes, granted, that would be a huge improvement. But then, is binutils
allowed to make that assumption about the ABI?  ... actually, never mind. Even
if it isn't, they could still write something like "The probable cause is a
lack of definition of the first virtual method in the class which isn't inline
nor pure-virtual".

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