[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 #12 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Zhihao Yuan from comment #11)
> 1. Adjust the error message to say, "The first non-inline, non-pure function
> may not have a definition in <Class>."

That error comes from the linker. The linker is not part of GCC, so this is the
wrong place to ask for linker changes.

> 2. Add extra information to name the key function, and pass it to the
> linker, generate an error message to match MSVC's quality.

That's what comment 7 suggested. Comment 10 links to the response to that.

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