1 /* { dg-do compile } */
2 /* { dg-options "" } */
3
4 /* Check compatibility of array declarations. */
5
6 /* Incomplete decl matches. */
7 extern char arr0[];
8 char arr0[1];
9
10 /* Two integral expressions must be the same. Note that 0 is
11 a gcc extension, but it should work like any other constant. */
12 extern char arr1[1];
13 char arr1[1];
14 extern char arr2[0];
15 char arr2[0];
16 extern char arr3[0]; /* { dg-message "note: previous declaration" } */
17 char arr3[1]; /* { dg-error "conflicting types" } */
18
19 /* Variable size matches. */
func(int n,int m)20 void func(int n, int m)
21 {
22 /* The next two are from the example in c99 6.7.5.2/9. */
23 {
24 /* Invalid: not compatible because 4 != 6. */
25 int a[n][6][m];
26 int (*p)[4][n+1];
27 p = a; /* { dg-warning "incompatible" } */
28 }
29 {
30 /* Compatible, but defined behavior only if n == 6 and m == n+1. */
31 int c[n][n][6][m];
32 int (*r)[n][n][n+1];
33 r = c;
34 }
35 {
36 /* Compatible, but undefined behavior; (2, 2) is not a constant
37 expression, and thus A is a VLA. */
38 int a[6][(2, 2)];
39 int (*p)[3];
40 p = a; /* { dg-bogus "incompatible" "bad vla handling" } */
41 }
42 }
43