[Bug ld/28973] Improve error message for missing vtable

[amodra at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28973

Alan Modra <amodra at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |NOTABUG

--- Comment #1 from Alan Modra <amodra at gmail dot com> ---
The related gcc "bug" has been around since 2009, and no one wanting an
improvement in the error message has been bothered enough to write a patch. 
Anyone hitting the error does a web search and quickly finds what "vtable for"
means.  That indicates to me that this linker bug will sit here forever too.

I am not going to write a patch, but if someone did want to emit a slightly
better message, you'd need to look at ldmain.c:undefined_symbol and match
symbols starting with "_ZTV" to emit a slightly better message mentioning "the
first non-pure non-inline virtual member function" of the type.  I don't know
how the linker can know the key function B::foo in the example.

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