[Bug sanitizer/80550] New: error: case label does not reduce to an integer constant

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80550

            Bug ID: 80550
           Summary: error: case label does not reduce to an integer
                    constant
           Product: gcc
           Version: 7.1.0
            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
  Target Milestone: ---

markus@x4 mplayer % cat demux_mov.i
void foo(int a) {
  switch (a)
  case 169 << 24:;
}

markus@x4 mplayer % gcc -c demux_mov.i
markus@x4 mplayer % clang -fsanitize=undefined -c demux_mov.i
markus@x4 mplayer % gcc -fsanitize=undefined -c demux_mov.i
demux_mov.i: In function ‘foo’:
demux_mov.i:3:3: error: case label does not reduce to an integer constant
   case 169 << 24:;
   ^~~~