[Bug target/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 #41 from Iain Sandoe <iains at gcc dot gnu.org> 2011-10-17 22:52:28 UTC ---
(In reply to comment #39)

I'll try and cook up a radar...  (against sigtramp unwind data in Libc taking
into account your following comment).

I guess we should not expect a fix for Darwin 9 - so the fix will likely be
needed in any case.

> > It should be possible to produce a test-case w/out Ada (filing a bug that
> > requires GCC+Ada is not likely to get far).   I wonder why my c++ case doesn't
> > appear to fail.
> 
> Because %rbx is saved in the prologue of do_fail.

hm.  Isn't that the correct action?
also - _ada_c52104y saves %rbx in its prologue.  

I thought we were looking for a situation where the saves were OK, but the
restores were wrong - and I was expecting the c++ emulation to do roughly the
same thing.  Perhaps there's a difference in the way it unwinds.