1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
/* -fstrict-flex-arrays=3 is the strictest, only [] is treated as
flexible array. */
/* PR tree-optimization/101836 */
/* { dg-do run } */
/* { dg-options "-O2 -fstrict-flex-arrays=3" } */
#include <stdio.h>
#define expect(p, _v) do { \
size_t v = _v; \
if (p == v) \
printf("ok: %s == %zd\n", #p, p); \
else \
{ \
printf("WAT: %s == %zd (expected %zd)\n", #p, p, v); \
__builtin_abort (); \
} \
} while (0);
struct trailing_array_1 {
int a;
int b;
int c[4];
};
struct trailing_array_2 {
int a;
int b;
int c[1];
};
struct trailing_array_3 {
int a;
int b;
int c[0];
};
struct trailing_array_4 {
int a;
int b;
int c[];
};
void __attribute__((__noinline__)) stuff(
struct trailing_array_1 *normal,
struct trailing_array_2 *trailing_1,
struct trailing_array_3 *trailing_0,
struct trailing_array_4 *trailing_flex)
{
expect(__builtin_object_size(normal->c, 1), 4 * __SIZEOF_INT__);
expect(__builtin_object_size(trailing_1->c, 1), __SIZEOF_INT__);
expect(__builtin_object_size(trailing_0->c, 1), 0);
expect(__builtin_object_size(trailing_flex->c, 1), -1);
}
int main(int argc, char *argv[])
{
stuff((void *)argv[0], (void *)argv[0], (void *)argv[0], (void *)argv[0]);
return 0;
}
|
