gcc/testsuite/gcc.dg/Wstringop-overflow-63.c

   1 /* PR middle-end/92936 - missing warning on a past-the-end store to a PHI
   2    Test case derived from gcc/opts-common.c.
   3    { dg-do compile }
   4    { dg-options "-O2 -Wall" } */
   5
   6 typedef __SIZE_TYPE__ size_t;
   7
   8 char* f (const void*, ...);
   9
  10 const char *
  11 candidates_list_and_hint (const char *arg, char **str, const char *a[])
  12 {
  13   size_t len = 0;
  14   int i;
  15
  16   for (i = 0; a[i]; ++i)
  17     len += __builtin_strlen (a[i]) + 1;
  18
  19   char *p = (char*)__builtin_malloc (len);
  20   *str = p;
  21
  22   for (i = 0; a[i]; ++i)
  23     {
  24       len = __builtin_strlen (a[i]);
  25       __builtin_memcpy (p, a[i], len);
  26       p[len] = ' ';
  27       p += len + 1;
  28     }
  29
  30   p[-1] = '\0';     // { dg-bogus "\\\[-Wstringop-overflow" }
  31
  32   return f (arg, &a);
  33 }