[Bug tree-optimization/10980] vararg functions are not inlined

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=10980

--- Comment #12 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-10-18 09:54:03 UTC ---
(In reply to comment #11)
> (In reply to comment #10)
> > I bet it just ignores the attribute that is not how the attribute is
> > supposed to work.
> > 
> > We output error in this case intentionally (and warning in at the same
> > spot if function is declared inline and -Winline is given).
> > Functions marked always_inlined really ought to be always inlined and
> > attribute is supposed to be useable in the cases where compilation would
> > fail otherwise (such as SSE buitins).
> > 
> > Our documentation is however not particularly clear here, perhaps it should
> > be updated...
> > 
> > Honza
> 
> Seeing that documentation is unclear (no mention of when errors or warnings are
> produced), and Qt Creator devs want to know what version of GCC started
> errorring on this, could you please let me know what GCC version started
> producing errors? Thanks!

GCC always errored out on this (previously by sorry(), now with error()).

We can possibly inline varargs functions when we delay lowering the
vararg builtins to the stdarg pass (which would clean up its implementation
a lot ...).