[Bug bootstrap/50543] New: Bootstrap fails to build for latest 4.6.0

["kirill.yukhin at intel dot com" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50543

             Bug #: 50543
           Summary: Bootstrap fails to build for latest 4.6.0
    Classification: Unclassified
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: kirill.yukhin@intel.com


Hi,
I am not sure, but possibly this will duplicate some other bug.

Bootstrap miscompares on latest 4.6.0 sources:


$ ../gcc/configure i686-linux --with-arch=corei7 --with-cpu=corei7
--enable-clocale=gnu --with-system-zlib --enable-shared --with-demangler-in-ld
--enable-cloog-backend=isl --with-fpmath=sse --prefix=$PREFIX
--enable-languages=c,c++,fortran
$ make -j24
...
make[2]: Entering directory `/export/users/kyukhin/ws_ref/4.6_build'
make[3]: Entering directory `/export/users/kyukhin/ws_ref/4.6_build'
rm -f stage_current
make[3]: Leaving directory `/export/users/kyukhin/ws_ref/4.6_build'
Comparing stages 2 and 3
warning: gcc/cc1plus-checksum.o differs
warning: gcc/cc1-checksum.o differs
Bootstrap comparison failure!
gcc/tree-ssa-loop-im.o differs
gcc/loop-iv.o differs
gcc/ira-build.o differs
gcc/reload.o differs
gcc/gcov.o differs
gcc/tree-vect-stmts.o differs
gcc/tree-vrp.o differs
gcc/reload1.o differs
gcc/bb-reorder.o differs
gcc/real.o differs
gcc/ira.o differs
gcc/dwarf2out.o differs
gcc/tree-ssa-loop-prefetch.o differs
gcc/fold-const.o differs
gcc/ira-emit.o differs
gcc/cfgexpand.o differs
gcc/build/genautomata.o differs
gcc/omega.o differs
gcc/ira-conflicts.o differs
gcc/gcc.o differs
gcc/store-motion.o differs
gcc/ipa-split.o differs
gcc/sel-sched.o differs
gcc/plugin.o differs
gcc/tree-predcom.o differs
gcc/driver-i386.o differs
gcc/tree.o differs
libcpp/directives.o differs
libcpp/charset.o differs
libcpp/traditional.o differs
libcpp/expr.o differs
libdecnumber/bid2dpd_dpd2bid.o differs
libiberty/sha1.o differs
libiberty/pic/sha1.o differs
lto-plugin/.libs/lto-plugin.o differs
make[2]: *** [compare] Error 1
make[2]: Leaving directory `/export/users/kyukhin/ws_ref/4.6_build'
make[1]: *** [stage3-bubble] Error 2
make[1]: Leaving directory `/export/users/kyukhin/ws_ref/4.6_build'
make: *** [all] Error 2