[Bug sanitizer/82779] New: [8 regression] On ppc64le bootstrap-ubsan causes "gcc -dumpspecs" segfault

["trippels at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82779

            Bug ID: 82779
           Summary: [8 regression] On ppc64le bootstrap-ubsan causes "gcc
                    -dumpspecs" segfault
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org
                CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
                    jakub at gcc dot gnu.org, kcc at gcc dot gnu.org, marxin at gcc dot gnu.org
  Target Milestone: ---

On ppc64le --with-build-config=bootstrap-ubsan:

trippels@gcc2-power8 gcc_build_dir_ % gdb --args
/home/trippels/gcc_build_dir_/./gcc/xgcc -B/home/trippels/gcc_build_dir_/./gcc/
-dumpspecs
Reading symbols from /home/trippels/gcc_build_dir_/./gcc/xgcc...done.
(gdb) run
Starting program: /home/trippels/gcc_build_dir_/gcc/xgcc
-B/home/trippels/gcc_build_dir_/./gcc/ -dumpspecs
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) bt
#0  0x0000000000000000 in ?? ()
#1  0x000000001028cb44 in __interceptor_signal (signum=<optimized out>,
handler=0x1) at
../../../../gcc/libsanitizer/sanitizer_common/sanitizer_signal_interceptors.inc:32
#2  0x0000000010020130 in driver::global_initializations (this=0x3fffffffec30)
at ../../gcc/gcc/gcc.c:7391
#3  0x0000000010003f84 in driver::main (this=0x3fffffffec30, argc=<optimized
out>, argv=<optimized out>) at ../../gcc/gcc/gcc.c:7302
#4  0x00000000100045a8 in main (argc=<optimized out>, argv=0x3ffffffff068) at
../../gcc/gcc/gcc-main.c:46