Description of problem:
An internal compiler error occures in compiling.

Version-Release number of selected component (if applicable):
4.1.0-3

How reproducible:
Always

Steps to Reproduce:
$ cat foo.c
int
foo(void)
{
   if (sizeof(long) == 8) {
      typedef union {
         long i;
         char c[8];
      } comm;
      comm static volatile u;
      u.i = 0x01020304;
      u.i <<= 16, u.i <<= 16;
      u.i |= 0x05060708;
      return u.c[0] == 0x01 && u.c[1] == 0x02;
   }
   return 2;
}
$ gcc -O0 -g -c foo.c

Actual results:
foo.c:16: internal compiler error: in dwarf2out_finish, at dwarf2out.c:14116
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://bugzilla.redhat.com/bugzilla> for instructions.
Preprocessed source stored into /tmp/cc??????.out file, please attach this to
your bugreport.

Expected results:
Compilation should be finish successful.

Additional info:
By omit "-g" or change "-O0" to "-O1", we can get around this error.