gcc/testsuite/gcc.dg/Wstrict-overflow-12.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 when using strict
   7    overflow semantics.  */
   8
   9 int
  10 foo ()
  11 {
  12   int i, bits;
  13   for (i = 1, bits = 1; i > 0; i += i) /* { dg-warning "assuming signed overflow does not occur" "correct warning" } */
  14     ++bits;
  15   return bits;
  16 }