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

["redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

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

--- Comment #25 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes, and it 1) refers to the key function and 2) is done by the linker not the
compiler.

Which is what I've been suggesting.

If binutils wants to do this and wants to provide a URL, we'll need a more
permanent home for the info at
https://gcc.gnu.org/wiki/VerboseDiagnostics#undefined_reference_to_vtable_for_X

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