gcc/testsuite/gcc.dg/pr89689.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -Warray-bounds" } */
   3
   4 #include <string.h>
   5 #include <assert.h>
   6 #include <stdio.h>
   7
   8 static inline __attribute__((__artificial__)) void *a(char *c, const char *d, long n)
   9 {
  10     return __builtin___memcpy_chk(c, d, n, __builtin_object_size(c, 0));
  11 }
  12 typedef struct {
  13     char *data;
  14     int len;
  15 } sb_t;
  16 const char __sb_slop[1];
  17 static void inline set0(sb_t *c)
  18 {
  19     if (c->data != __sb_slop)
  20         c->data[0] = 0;
  21     else
  22         assert (c->data[0] == 0);
  23 }
  24 char buf[5];
  25 sb_t l = {
  26     .data = buf,
  27     .len = 0
  28 };
  29 void o()
  30 {
  31     char *data = "abcd";
  32     sb_t h = l;
  33     set0(&h);
  34     a(h.data, data, strlen(data));
  35     printf("%s\n", h.data);
  36     printf("%d\n", h.data == __sb_slop);
  37     printf("%d\n", h.data == buf);
  38     set0(&h);
  39 }
  40 int main(void) {
  41     o();
  42     return 0;
  43 }