On Thu, May 12, 2005 at 06:11:46AM -0700, H. J. Lu wrote: > On Thu, May 12, 2005 at 01:42:26PM +0100, Joern RENNECKE wrote: > > Andrew Pinski wrote: > > > > >> > > >> > > >> > > >Actually it is easy to peak at any of them and you will see that the > > >tree optimizators (lim to be in fact) has changed something somewhere. > > > > > > > > The trouble is that I'm running the tests on Red hat Enterprise Linux, > > and even > > with the address randomization allegedly turned off, most addresses > > still end > > up being random. So I've looked at differences of dump file sizes > > instead, and the > > first was in the greg dumps. Still, experimentation with 3.4.3 supports > > your > > statement that the mainline code is to blame: I also get bootstrap > > comparison > > failures with 3.4.3 as the bootstrap compiler, in fact two different sets > > using two different mainline snapshots: > > > > Bootstrap comparison failure! > > ./expmed.o differs > > build/genattrtab.o differs > > build/gengtype-lex.o differs > > make[1]: *** [gnucompare] Error 1 > > > > and > > > > Bootstrap comparison failure! > > ./emit-rtl.o differs > > ./expmed.o differs > > build/genattrtab.o differs > > make[1]: *** [gnucompare] Error 1 > > FWIW, I saw the same problem on RHEL 4. >
I have verified that this patch http://gcc.gnu.org/ml/gcc-patches/2005-05/msg00955.html caused the comparsion failure on RHEL 4/ia32. RHEL 4/ia64 and RHEL 4/EM64T are OK. The difference is I have kernel.exec-shield-randomize = 0 in /etc/sysctl.conf on RHEL 4/ia32. I am rerunning it on RHEL 4/ia32 with kernel.exec-shield-randomize = 1 now. H.J.
