gcc_attribute_var.c revision 1.13 
1/*	$NetBSD: gcc_attribute_var.c,v 1.13 2024/09/28 15:51:40 rillig Exp $	*/
2# 3 "gcc_attribute_var.c"
3
4/*
5 * Tests for the GCC __attribute__ for variables.
6 *
7 * https://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html
8 */
9
10/* lint1-extra-flags: -X 351 */
11
12void
13write_to_page(unsigned index, char ch)
14{
15	static char page[4096]
16	    __attribute__((__aligned__(4096)));
17
18	page[index] = ch;
19}
20
21void
22placement(
23    __attribute__((__deprecated__)) int before,
24    int __attribute__((__deprecated__)) between,
25    int after __attribute__((__deprecated__))
26);
27
28void println(void);
29
30/*
31 * A GCC extension allows statement of the form __attribute__((fallthrough)),
32 * therefore, to avoid shift/reduce conflicts in the grammar, the attributes
33 * cannot be part of the declaration specifiers between begin_type/end_type.
34 */
35void
36ambiguity_for_attribute(void)
37{
38	__attribute__((unused)) _Bool var1;
39
40	switch (1) {
41	case 1:
42		println();
43		__attribute__((unused)) _Bool var2;
44		__attribute__((fallthrough));
45		case 2:
46			println();
47	}
48}
49
50void
51attribute_after_array_brackets(
52    const char *argv[] __attribute__((__unused__))
53)
54{
55}
56
57struct attribute_in_member_declaration {
58	int __attribute__(())
59	    x __attribute__(()),
60	    y __attribute__(());
61
62	unsigned int __attribute__(())
63	    bit1:1 __attribute__(()),
64	    bit2:2 __attribute__(()),
65	    bit3:3 __attribute__(());
66};
67
68
69void
70anonymous_members(void)
71{
72	struct single_attribute_outer {
73		struct single_attribute_inner {
74			int member;
75		} __attribute__(());
76	} __attribute__(());
77
78	struct multiple_attributes_outer {
79		struct multiple_attributes_inner {
80			int member;
81		} __attribute__(()) __attribute__(());
82	} __attribute__(()) __attribute__(());
83}
84