[Bug bootstrap/49740] New: [4.7 Regression] powerpc native bootstrap with -O3 produces "Bootstrap comparison failure!"

[dougmencken at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49740

           Summary: [4.7 Regression] powerpc native bootstrap with -O3
                    produces "Bootstrap comparison failure!"
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: bootstrap
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: dougmenc...@gmail.com


"Bootstrap comparison failure!"

After http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49474 (well-hidden wrong
comparison in rtl (cprop.c)) has been fixed, I succeeded to stage3, and got:

Comparing stages 2 and 3
warning: gcc/cc1-checksum.o differs
warning: gcc/cc1plus-checksum.o differs
Bootstrap comparison failure!
gcc/fold-const.o differs
gcc/tree-into-ssa.o differs
gcc/cfgrtl.o differs
gcc/gimplify.o differs
gcc/build/genattrtab.o differs
...

Full bootstrap log is available at:
http://ftp.osuosl.org/pub/manulix/logs+errors/gcc-v4.7-20110709-bootstrap.log