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-warning@-1 {{attribute 'unused' ignored, because it is not attached to a declaration}} 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 alias1() {} 15 void alias2 [[gnu::alias("_Z6alias1v")]] (); 16 17 [[gnu::aligned(8)]] int aligned; 18 void aligned_fn [[gnu::aligned(32)]] (); 19 struct [[gnu::aligned(8)]] aligned_struct {}; 20 21 [[gnu::malloc, gnu::alloc_size(1,2)]] void *alloc_size(int a, int b); 22 23 void always_inline [[gnu::always_inline]] (); 24 25 __thread int tls_model [[gnu::tls_model("local-exec")]]; 26 27 void cleanup(int *p) { 28 int n [[gnu::cleanup(cleanup)]]; 29 } 30 31 void deprecated1 [[gnu::deprecated]] (); // expected-note {{here}} 32 [[gnu::deprecated("custom message")]] void deprecated2(); // expected-note {{here}} 33 void deprecated3() { 34 deprecated1(); // expected-warning {{deprecated}} 35 deprecated2(); // expected-warning {{custom message}} 36 } 37 38 [[gnu::naked(1,2,3)]] void naked(); // expected-error {{takes no arguments}} 39 40 void nonnull [[gnu::nonnull]] (); // expected-warning {{applied to function with no pointer arguments}} 41 42 int noreturn [[gnu::noreturn]]; // expected-warning {{'noreturn' only applies to function types}} 43 44 struct [[gnu::packed]] packed { char c; int n; }; 45 static_assert(sizeof(packed) == sizeof(char) + sizeof(int), "not packed"); 46