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

   1 /* PR tree-optimization/86614 - duplicate -Warray-bounds for a strncpy
   2    call with out-of-bounds offset
   3    { dg-do compile }
   4    { dg-options "-O2 -Warray-bounds" } */
   5
   6 #if __cplusplus
   7 extern "C"
   8 #endif
   9 char *strncpy (char *, const char *, __SIZE_TYPE__);
  10
  11 void sink (void *);
  12
  13 struct A { char b[17]; } a[2];
  14
  15 void g (const char *s, unsigned n)
  16 {
  17   int i = (char *)a[1].b - (char *)a + 1;
  18   char *d = a[1].b;
  19   /* Verify the bug is diagnosed exactly once, using either form
  20      of the warning.  */
  21   strncpy (d + i, s, n);        /* { dg-warning "array subscript \[0-9]+ is outside array bounds|offset \[0-9]+ is out of the bounds" } */
  22                                 /* { dg-bogus "offset \[0-9]+ is out of the bounds|array subscript \[0-9]+ is outside array bounds" "" { target *-*-* } .-1 } */
  23 }