gcc/testsuite/gcc.dg/pr78185.c

   1 /* { dg-do run { target *-*-linux* *-*-gnu* } } */
   2 /* { dg-options "-O" } */
   3
   4 #include <unistd.h>
   5 #include <signal.h>
   6 #include <stdlib.h>
   7
   8 static char var1 = 0L;
   9 static char *var2 = &var1;
  10
  11 void do_exit (int i)
  12 {
  13   exit (0);
  14 }
  15
  16 int main(void)
  17 {
  18   struct sigaction s;
  19   sigemptyset (&s.sa_mask);
  20   s.sa_handler = do_exit;
  21   s.sa_flags = 0;
  22   sigaction (SIGALRM, &s, NULL);
  23   alarm (1);
  24   /* The following loop is infinite, the division by zero should not
  25      be hoisted out of it.  */
  26   for (; (var1 == 0 ? 0 : (100 / var1)) == *var2; );
  27   return 0;
  28 }