gcc/testsuite/gcc.dg/Wstrict-overflow-15.c

/* { dg-do compile } */
/* { dg-options "-fstrict-overflow -O2 -Wstrict-overflow=4" } */

/* Source: Ian Lance Taylor.  */

int
foo (int j)
{
  int i;
  int sum = 0;

  for (i = 1; i < j; i += i)
    sum += __builtin_abs (i); /* { dg-warning "assuming signed overflow does not occur" "" } */
  return sum;
}