[Bug bootstrap/52041] New: [4.7 Regression] Bootstrap failure at revision 183650 with --enable-checking=release

["dominiq at lps dot ens.fr" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52041

             Bug #: 52041
           Summary: [4.7 Regression] Bootstrap failure at revision 183650
                    with --enable-checking=release
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: dominiq@lps.ens.fr
                CC: iains@gcc.gnu.org, ian@gcc.gnu.org
              Host: x86_64-apple-darwin10
            Target: x86_64-apple-darwin10
             Build: x86_64-apple-darwin10


Bootstrapping revision 183650 configured with '--enable-checking=release' fails
on x86_64-apple-darwin10 with

...
Comparing stages 2 and 3
warning: gcc/cc1-checksum.o differs
warning: gcc/cc1plus-checksum.o differs
Bootstrap comparison failure!
gcc/tree-ssa-strlen.o differs
make[2]: *** [compare] Error 1
make[1]: *** [stage3-bubble] Error 2
make: *** [all] Error 2

Revision 183649 is OK:

[macbook] f90/bug% gfcp -v
Using built-in specs.
COLLECT_GCC=gfcp
COLLECT_LTO_WRAPPER=/opt/gcc/gcc4.7p/libexec/gcc/x86_64-apple-darwin10.8.0/4.7.0/lto-wrapper
Target: x86_64-apple-darwin10.8.0
Configured with: ../p_work/configure --prefix=/opt/gcc/gcc4.7p
--enable-languages=c,c++,lto,fortran --with-gmp=/opt/mp --with-system-zlib
--enable-checking=release --with-cloog=/opt/mp --enable-cloog-backend=isl
--enable-lto
Thread model: posix
gcc version 4.7.0 20120127 (experimental) [trunk revision 183649] (GCC) 

as well as 183674 without '--enable-checking=release'

[macbook] f90/bug% gfc -v
Using built-in specs.
COLLECT_GCC=gfc
COLLECT_LTO_WRAPPER=/opt/gcc/gcc4.7w/libexec/gcc/x86_64-apple-darwin10.8.0/4.7.0/lto-wrapper
Target: x86_64-apple-darwin10.8.0
Configured with: ../work/configure --prefix=/opt/gcc/gcc4.7w
--enable-languages=c,c++,fortran,objc,obj-c++,java,ada,lto --with-gmp=/opt/mp
--with-system-zlib --with-cloog=/opt/mp --enable-cloog-backend=isl --enable-lto
Thread model: posix
gcc version 4.7.0 20120129 (experimental) [trunk revision 183674p7] (GCC)