gcc/testsuite/gcc.dg/tree-ssa/strncat.c

   1 /* PR tree-optimization/83075 - Invalid strncpy optimization
   2    { dg-do run }
   3    { dg-options "-O2 -Wno-stringop-overflow" } */
   4
   5 int main (void)
   6 {
   7   char a[8] = "";
   8
   9   __builtin_strcpy (a, "123");
  10
  11   unsigned n0 = __builtin_strlen (a);
  12
  13   __builtin_strncat (a + 3, a, n0);
  14
  15   unsigned n1 = __builtin_strlen (a);
  16
  17   if (n1 == n0)
  18     __builtin_abort ();
  19 }