[Bug bootstrap/66801] New: [6 Regression] gcc miscompiled during PGO/LTO bootstrap

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66801

            Bug ID: 66801
           Summary: [6 Regression] gcc miscompiled during PGO/LTO
                    bootstrap
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org
  Target Milestone: ---

On ppc64le gcc gets miscompiled during stagefeedback phase:

 % /home/trippels/gcc_build_dir_/./gcc/xgcc --version
[1]    53644 segmentation fault (core dumped) 
/home/trippels/gcc_build_dir_/./gcc/xgcc --version

 % ../gcc/configure --with-cpu=power8 --disable-libstdcxx-pch --disable-libvtv
--disable-libitm --disable-libcilkrts --disable-libssp --disable-libgomp
--disable-werror --disable-multilib --enable-languages=c,c++
--enable-checking=release --with-build-config=bootstrap-lto
 % make -j120 BOOT_CFLAGS="-mcpu=power8 -O3 -pipe" STAGE1_CFLAGS="-mcpu=power8
-O3 -pipe" CFLAGS_FOR_TARGET="-mcpu=power8 -O3 -pipe"
CXXFLAGS_FOR_TARGET="-mcpu=power8 -O3 -pipe" profiledbootstrap