On Fri, 27 Apr 2018, Richard Biener wrote: > On Fri, 27 Apr 2018, David Edelsohn wrote: > > > Hi, Richi > > > > This patches causes a boostrap failure on AIX. Everything miscompares. > > The code itself is the same, but the DWARF debug information contains many > > differences. > > Does AIX use bootstrap-debug by default? I don't see how the patch > can cause this kind of issue directly but of course it will change > CH decisions which may expose latent bugs somewhere. > > Can you provide more details please, like actual differences? > I would have expected the dwarf2out.c change to be a more likely > candidate for such symtoms but I trust that you did properly > bisect to my patch?
OK, so the x86-64 -O3 bootstrap failure is not caused by this patch, reverting it doesn't fix the issue. The difference w/ the patch reverted is in debug info, all (indirect) strings reside at different offsets. If I strip the objects they compare identical. I'm trying reversal of that dwarf2out patch now. Richard.
