gcc/testsuite/gcc.dg/Wstrict-overflow-13.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-fstrict-overflow -O2 -Wstrict-overflow=2" } */
   3
   4 /* Source: Ian Lance Taylor.  Dual of no-strict-overflow-6.c.  */
   5
   6 /* VRP test.  This turns into an infinite loop (depending on what
   7    bigtime_test does), but at least we warn about it.  */
   8
   9 extern int bigtime_test (int);
  10 int
  11 foo ()
  12 {
  13   int j;
  14   for (j = 1; 0 < j; j *= 2) /* { dg-warning "assuming signed overflow does not occur" "correct warning" } */
  15     if (! bigtime_test (j))
  16       return 1;
  17   return 0;
  18 }