[Bug tree-optimization/16573] New: compiler crash while building groff with -fmudflap

["fche at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>]

Building groff/src/libs/libgroff/font.cpp recently started to die when
compiled with -fmudflap with a mainline CVS compiler.  I attach various
versions of test cases, and show the transcript here.


int text_file::next()
{
  if (buf == 0) {
    buf = 0;
  }
  for (;;) {
    int c;
    if
#if COMPILER_SEGV
      (0)
#else /* DOMINANCE_ABORT */
      (invalid_input_char(c))
#endif
      error("invalid input character code `%1'", int(c));
  } 
  return 0;
}

with COMPILER_SEGV defined, one gets

 /notnfs/fche/BUILD-gcc-mudflap/INST/libexec/gcc/i686-pc-linux-gnu/3.5.0/cc1plus
-fpreprocessed font2.ii -quiet -dumpbase font2.cpp -mtune=pentiumpro -auxbase
font2 -g -O2 -version -fmudflap -fno-builtin -fno-merge-constants -o font2.s
GNU C++ version 3.5.0 20040715 (experimental) (i686-pc-linux-gnu)
        compiled by GNU C version 3.5.0 20040713 (experimental).
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
font2.cpp: In member function `int text_file::next()':
font2.cpp:52: internal compiler error: Segmentation fault

without COMPILER_SEGV, one gets

 /notnfs/fche/BUILD-gcc-mudflap/INST/libexec/gcc/i686-pc-linux-gnu/3.5.0/cc1plus
-fpreprocessed font2.ii -quiet -dumpbase font2.cpp -mtune=pentiumpro -auxbase
font2 -g -O2 -version -fmudflap -fno-builtin -fno-merge-constants -o font2.s
GNU C++ version 3.5.0 20040715 (experimental) (i686-pc-linux-gnu)
        compiled by GNU C version 3.5.0 20040713 (experimental).
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
font2.cpp: In member function `int text_file::next()':
font2.cpp:52: error: dominator of 10 should be 11, not 0
font2.cpp:52: internal compiler error: in verify_dominators, at dominance.c:828
Please submit a full bug report,

-- 
           Summary: compiler crash while building groff with -fmudflap
           Product: gcc
           Version: 3.5.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: fche at redhat dot com
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16573