https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71460
--- Comment #19 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Uroš Bizjak from comment #18)
> (In reply to rguent...@suse.de from comment #17)
> > But this also hints at the ABI for
> >
> > void foo (union U { int x; float y; });
> >
> > changing with the patch, no? Or ultimatively at the FE using a bogus
> > check to verify ABI compatibility (just looking at TYPE_MODE).
Following test doesn't compile with patched compiler:
--cut here--
union U { int x; float y; } __attribute__ ((transparent_union));
void foo (union U);
void test (void)
{
union U t;
foo (1.0f);
foo (1);
}
--cut here--
-O2 -mfpmath=387 -m32:
union.c:1:7: warning: union cannot be made transparent
union U { int x; float y; } __attribute__ ((transparent_union));
but does compile OK with:
-msse -O2 -mfpmath=sse -m32
