🚀 go-pugleaf

/* This program illustrates a bug in the gcc optimizer, version 2.3.3
 * on a DECstation 3100.  Normal execution should return without printing
 * anything and this is the result when compiled without optimization.
 * However, when the -O2 flag is used, this program prints the error message.
 *
 * Ross Johnson (ross@cs.wisc.edu)
 */

void
Init(int *var)
{
  *var = 0;
}

void
main()
{
  int stuff, count, x = 0;
  char word[] = "c";

  Init(&stuff);
  word[count = 0] = (stuff == 0 ? (x=1, 'a') : (x=2, 'b'));
  /* if compared with 'c', the optimized program returns without ERROR */
  if (word[count] == 'a')
    return;
  printf("ERROR: prefix `%s' %d\n", word, x);
}