https://sourceware.org/bugzilla/show_bug.cgi?id=16746
--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> ---
(In reply to Richard Guenther from comment #2)
> Hmm, but that breaks the case where the symbol is still referenced from the
> linker plugin provided input
>
> extern void foobar (void);
> int
> main (int argc, char **argv)
> {
> if (!__builtin_constant_p (argc))
> foobar ();
> return 0;
> }
>
> add void foobar () {} to t2.c to make the link succeed.
Which of course may simply mean that the path through lang_add_input_file
misses
to emit warnings at all.
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