[Bug ada/50678] [4.7 Regression] FAIL: c52104y on x86_64-apple-darwin10

[ebotcazou at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50678

--- Comment #28 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2011-10-12 22:54:57 UTC ---
> OK. well  libgcc_s or libSystem contains the unwinder, depending on whether
> it's darwin9 or darwin10 (and assuming that there's no insertion caused by a
> DYLD_LIBRARY_PATH).  I'll have to trawl through it in more detail.

I'll try as well.

> I suppose that the fact that the tests pass at -O0 might simply reflect
> different register usage...  I was hoping that it might indicate a code-gen
> problem ;-)

Yes, it passes at -O0 because the stack pointer is restored from a stack slot
instead of from %rbx.  Tom's patch changed %r12 into %rbx here, which is OK.