gcc/testsuite/c-c++-common/Warray-bounds-6.c

   1 /* PR tree-optimization/86614 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O2 -Warray-bounds" } */
   4
   5 extern char *strncpy (char *, const char *, __SIZE_TYPE__);
   6
   7 void sink (void *);
   8
   9 struct A { char b[17]; } a[2];
  10
  11 void g (const char *s, unsigned n)
  12 {
  13   int i = (char *)a[1].b - (char *)a + 1;
  14   char *d = a[1].b;
  15   /* Ensure the same bug is not diagnosed more than once.  */
  16   strncpy (d + i, s, n);        /* { dg-warning "array subscript \[0-9]+ is outside array bounds of" } */
  17                                 /* { dg-bogus "offset \[0-9]+ is out of the bounds \\\[0, \[0-9]+\\\] of object 'a' with type" "" { target *-*-* } .-1 } */
  18 }