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

[iains at gcc dot gnu.org]

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

--- Comment #27 from Iain Sandoe <iains at gcc dot gnu.org> 2011-10-12 22:48:18 UTC ---
(In reply to comment #26)
> > reproducible (using gdb 7.1) on darwin9 @ m64 (m32 is OK on D9 and D10) - 
> > - so where are we looking for a problem- in the m64 libgcc_s unwinder - or in
> > the ada handers? .. or in libSystem ?
> 
> First the signal unwinder, i.e. how it restores registers that have been saved
> by the kernel when the signal was raised.  So libgcc or the system equivalent
> if there is one.  Unfortunately my Darwin knowledge is pretty limited...

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 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 ;-)