1 /* $NetBSD: msg_171.c,v 1.9 2023/07/07 19:45:22 rillig Exp $ */
2 # 3 "msg_171.c"
3
4 // Test for message: cannot assign to '%s' from '%s' [171]
5
6 /* lint1-extra-flags: -X 351 */
7
8 struct s {
9 int member;
10 };
11
12 /*ARGSUSED*/
13 void
example(int i,void * vp,struct s * s)14 example(int i, void *vp, struct s *s)
15 {
16 /* expect+1: error: cannot assign to 'int' from 'struct s' [171] */
17 i = *s;
18 /* expect+1: error: cannot assign to 'struct s' from 'int' [171] */
19 *s = i;
20
21 /* expect+1: error: cannot assign to 'pointer to void' from 'struct s' [171] */
22 vp = *s;
23 /* expect+1: error: cannot assign to 'struct s' from 'pointer to void' [171] */
24 *s = vp;
25 }
26
27 /*
28 * C99 6.5.2.5 says that a compound literal evaluates to an unnamed object
29 * with automatic storage duration, like any normal named object. It is an
30 * lvalue, which means that it is possible to take the address of the object.
31 * Seen in external/mpl/bind/dist/lib/dns/rbtdb.c, update_rrsetstats.
32 *
33 * Before init.c 1.111 from 2021-03-23, lint could not handle these nested
34 * initializations (the outer one for the variable 'p', the inner one for the
35 * compound literal) and wrongly complained about a type mismatch between
36 * 'struct point' and 'pointer to struct point'.
37 */
38 void
pointer_to_compound_literal(void)39 pointer_to_compound_literal(void)
40 {
41 struct point {
42 int x;
43 int y;
44 };
45 struct point *p = &(struct point){
46 12, 5,
47 };
48
49 /*
50 * A sizeof expression is another way to create nested
51 * initializations.
52 */
53 struct point p2 = {
54 (int)sizeof(struct point){
55 (int)sizeof(struct point){
56 (int)sizeof(struct point){
57 (int)sizeof(struct point){
58 0,
59 0,
60 },
61 0,
62 },
63 0,
64 },
65 0,
66 },
67 0,
68 };
69 }
70