1 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -std=c++11 -verify %s
2 
3 // Error cases.
4 
5 [[gnu::this_attribute_does_not_exist]] int unknown_attr;
6 // expected-warning@-1 {{unknown attribute 'this_attribute_does_not_exist' ignored}}
7 int [[gnu::unused]] attr_on_type;
8 // expected-error@-1 {{'unused' attribute cannot be applied to types}}
9 int *[[gnu::unused]] attr_on_ptr;
10 // expected-warning@-1 {{attribute 'unused' ignored, because it cannot be applied to a type}}
11 
12 // Valid cases.
13 
14 void aliasb [[gnu::alias("_Z6alias1v")]] ();
15 void alias1() {}
16 void aliasa [[gnu::alias("_Z6alias1v")]] ();
17 
18 [[gnu::aligned(8)]] int aligned;
19 void aligned_fn [[gnu::aligned(32)]] ();
20 struct [[gnu::aligned(8)]] aligned_struct {};
21 
22 [[gnu::malloc, gnu::alloc_size(1,2)]] void *alloc_size(int a, int b);
23 
24 void always_inline [[gnu::always_inline]] ();
25 
26 __thread int tls_model [[gnu::tls_model("local-exec")]];
27 
28 void cleanup(int *p) {
29   int n [[gnu::cleanup(cleanup)]];
30 }
31 
32 void deprecated1 [[gnu::deprecated]] (); // expected-note {{here}}
33 [[gnu::deprecated("custom message")]] void deprecated2(); // expected-note {{here}}
34 void deprecated3() {
35   deprecated1(); // expected-warning {{deprecated}}
36   deprecated2(); // expected-warning {{custom message}}
37 }
38 
39 [[gnu::naked(1,2,3)]] void naked(); // expected-error {{takes no arguments}}
40 
41 void nonnull [[gnu::nonnull]] (); // expected-warning {{applied to function with no pointer arguments}}
42 
43 // [[gnu::noreturn]] appertains to a declaration, and marks the innermost
44 // function declarator in that declaration as being noreturn.
45 int noreturn [[gnu::noreturn]]; // expected-warning {{'noreturn' only applies to function types}}
46 int noreturn_fn_1();
47 int noreturn_fn_2() [[gnu::noreturn]]; // expected-warning {{cannot be applied to a type}}
48 int noreturn_fn_3 [[gnu::noreturn]] ();
49 [[gnu::noreturn]] int noreturn_fn_4();
50 int (*noreturn_fn_ptr_1 [[gnu::noreturn]])() = &noreturn_fn_1; // expected-error {{cannot initialize}}
51 int (*noreturn_fn_ptr_2 [[gnu::noreturn]])() = &noreturn_fn_3;
52 [[gnu::noreturn]] int (*noreturn_fn_ptr_3)() = &noreturn_fn_1; // expected-error {{cannot initialize}}
53 [[gnu::noreturn]] int (*noreturn_fn_ptr_4)() = &noreturn_fn_3;
54 
55 struct [[gnu::packed]] packed { char c; int n; };
56 static_assert(sizeof(packed) == sizeof(char) + sizeof(int), "not packed");
57