gcc/testsuite/gcc.c-torture/execute/enum-2.c

   1 /* Copyright (C) 2000 Free Software Foundation */
   2 /* by Alexandre Oliva  <aoliva@redhat.com> */
   3
   4 enum foo { FOO, BAR };
   5
   6 /* Even though the underlying type of an enum is unspecified, the type
   7    of enumeration constants is explicitly defined as int (6.4.4.3/2 in
   8    the C99 Standard).  Therefore, `i' must not be promoted to
   9    `unsigned' in the comparison below; we must exit the loop when it
  10    becomes negative. */
  11
  12 int
  13 main ()
  14 {
  15   int i;
  16   for (i = BAR; i >= FOO; --i)
  17     if (i == -1)
  18       abort ();
  19
  20   exit (0);
  21 }
  22