[Bug lto/63998] gcc.dg/lto/pr60820 fails on darwin

["rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63998

--- Comment #5 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 20 Nov 2014, dominiq at lps dot ens.fr wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63998
> 
> --- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> > If so, it would probably need
> >
> > // { dg-additional-options "-Wl,-undefined,dynamic_lookup" { target *-*-darwin* } }
> > // { dg-additional-options "-Wl,-flat_namespace" { target *-*-darwin[89]* } }
> >
> > (see gcc.dg/attr-weakref-1.c).
> >
> > Untested so far.
> 
> It does not work because lto does not support dg-additional-options.
> 
> I confirm that adding -w to dg-lto-options fixes the failures. However I have
> noticed that there is a lto_prune_warns in lib/lto.exp. It would probably
> better to add
> "warning: alias definitions not supported in Mach-O; ignored" to the list.

I'd rather skip the test for darwin then.  The test tests sth with
"weak" which results in alias definitions, so if that doesn't work
then what's the point testing it?

Richard.