On 04/28/2018 12:46 AM, Richard Biener wrote: > 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. > FWIW, the PA port has been failing a standard -O2 bootstrap for a few days.
r259643 is good, r259672 is bad. I haven't looked into it any deeper yet. jeff
