[Bug debug/49841] [4.7 regression] AIX bootstrap failure in dwarf2cfi.c:maybe_record_trace_start

[rth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49841

--- Comment #2 from Richard Henderson <rth at gcc dot gnu.org> 2011-07-25 16:39:43 UTC ---
Created attachment 24832
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24832
possible fix

The ICE caught exactly what it was supposed to -- a difference in
unwind info across two paths.  Of course, that's not what we were
intending to describe for the AIX conditional save of R2.

Describing the R2 save after the join label is one way to correctly
describe unwind info; another would be a special insn pattern.  Do
you have a preference as to how this should be solved?

I've started a ppc64-linux bootstrap in the compile farm; you may
be able to get a full test result faster.