[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 #19 from Eyal Rozenberg <eyalroz1 at gmx dot com> ---
(In reply to Jonathan Wakely from comment #17)
Ok, have read the wiki page.

> The linker could easily say that, with no changes from GCC.

Is the signature, or name, of the "key function" present in compiled object
files which have seen the class definition?

If the answer is yes, we could just go ahead and file a bug against binutils...

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