gcc/testsuite/c-c++-common/Wsizeof-pointer-div.c

   1 /* Test -Wsizeof-pointer-div warnings.  */
   2 /* { dg-do compile } */
   3 /* { dg-options "-Wall" } */
   4
   5 int
   6 f1 (int *array)
   7 {
   8   int i;
   9   i = sizeof array / sizeof *array;             /* { dg-warning "does not compute the number of array elements" } */
  10   i += sizeof array / sizeof array[0];          /* { dg-warning "does not compute the number of array elements" } */
  11   i += sizeof(array) / sizeof(*array);          /* { dg-warning "does not compute the number of array elements" } */
  12   i += sizeof(array) / sizeof(array[0]);        /* { dg-warning "does not compute the number of array elements" } */
  13   i += (sizeof(array)) / (sizeof(array[0]));    /* { dg-warning "does not compute the number of array elements" } */
  14   i += sizeof(array) / sizeof(int);             /* { dg-warning "does not compute the number of array elements" } */
  15   i += sizeof(array) / sizeof(char);
  16   i += sizeof(*array) / sizeof(char);
  17   i += sizeof(array[0]) / sizeof(char);
  18   return i;
  19 }
  20
  21 int
  22 f2 (void)
  23 {
  24   int array[10];
  25   int i;
  26   i = sizeof array / sizeof *array;
  27   i += sizeof array / sizeof array[0];
  28   i += sizeof(array) / sizeof(*array);
  29   i += sizeof(array) / sizeof(array[0]);
  30   i += (sizeof(array)) / (sizeof(array[0]));
  31   i += sizeof(array) / sizeof(int);
  32   i += sizeof(array) / sizeof(char);
  33   i += sizeof(*array) / sizeof(char);
  34   i += sizeof(array[0]) / sizeof(char);
  35   return i;
  36 }
  37
  38 int
  39 f3 (int a[])
  40 {
  41   return sizeof a / sizeof *a;                  /* { dg-warning "Wsizeof-array-argument" } */
  42 }