1 // RUN: %clang_cc1 -triple x86_64-apple-darwin10 -fsyntax-only -verify -std=c2x %s
2 
3 struct S {};
4 struct S * [[clang::address_space(1)]] Foo;
5 
6 enum [[clang::enum_extensibility(open)]] EnumOpen {
7   C0 = 1, C1 = 10
8 };
9 
10 enum [[clang::flag_enum]] EnumFlag {
11   D0 = 1, D1 = 8
12 };
13 
14 void foo(void *c) [[clang::overloadable]];
15 void foo(char *c) [[clang::overloadable]];
16 
17 void context_okay(void *context [[clang::swift_context]]) [[clang::swiftcall]];
18 void context_okay2(void *context [[clang::swift_context]], void *selfType, char **selfWitnessTable) [[clang::swiftcall]];
19 
20 void *f1(void) [[clang::ownership_returns(foo)]];
21 void *f2() [[clang::ownership_returns(foo)]]; // expected-warning {{'ownership_returns' attribute only applies to non-K&R-style functions}}
22 
23 void foo2(void) [[clang::unavailable("not available - replaced")]]; // expected-note {{'foo2' has been explicitly marked unavailable here}}
bar(void)24 void bar(void) {
25   foo2(); // expected-error {{'foo2' is unavailable: not available - replaced}}
26 }
27 
28 [[nodiscard]] int without_underscores(void);
29 [[__nodiscard__]] int underscores(void);
30 
31 // Match GCC's behavior for C attributes as well.
32 [[gnu::constructor]] void ctor_func(void);
33 [[gnu::destructor]] void dtor_func(void);
34 [[gnu::hot]] void hot_func(void);
35 [[__gnu__::hot]] void hot_func2(void);
36 [[gnu::__hot__]] void hot_func3(void);
37 [[__gnu__::__hot__]] void hot_func4(void);
38 
39 // Note how not all GCC attributes are supported in C.
40 [[gnu::abi_tag("")]] void abi_func(void); // expected-warning {{unknown attribute 'abi_tag' ignored}}
41 struct S s [[gnu::init_priority(1)]]; // expected-warning {{unknown attribute 'init_priority' ignored}}
42