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      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 [[gnu::fastcall]] void pr17424_1();
     12 // expected-warning@-1 {{calling convention 'fastcall' ignored for this target}}
     13 [[gnu::fastcall]] [[gnu::stdcall]] void pr17424_2();
     14 // expected-warning@-1 {{calling convention 'fastcall' ignored for this target}}
     15 // expected-warning@-2 {{calling convention 'stdcall' ignored for this target}}
     16 [[gnu::fastcall]] __stdcall void pr17424_3();
     17 // expected-warning@-1 {{calling convention 'fastcall' ignored for this target}}
     18 // expected-warning@-2 {{calling convention '__stdcall' ignored for this target}}
     19 [[gnu::fastcall]] void pr17424_4() [[gnu::stdcall]];
     20 // expected-warning@-1 {{calling convention 'fastcall' ignored for this target}}
     21 // expected-warning@-2 {{attribute 'stdcall' ignored, because it cannot be applied to a type}}
     22 // expected-warning@-3 {{calling convention 'stdcall' ignored for this target}}
     23 void pr17424_5 [[gnu::fastcall]]();
     24 // expected-warning@-1 {{calling convention 'fastcall' ignored for this target}}
     25 
     26 // Valid cases.
     27 
     28 void aliasb [[gnu::alias("_Z6alias1v")]] ();
     29 void alias1() {}
     30 void aliasa [[gnu::alias("_Z6alias1v")]] ();
     31 
     32 extern struct PR22493Ty {
     33 } PR22493 [[gnu::alias("_ZN7pcrecpp2RE6no_argE")]];
     34 
     35 [[gnu::aligned(8)]] int aligned;
     36 void aligned_fn [[gnu::aligned(32)]] ();
     37 struct [[gnu::aligned(8)]] aligned_struct {};
     38 
     39 void always_inline [[gnu::always_inline]] ();
     40 
     41 __thread int tls_model [[gnu::tls_model("local-exec")]];
     42 
     43 void cleanup(int *p) {
     44   int n [[gnu::cleanup(cleanup)]];
     45 }
     46 
     47 void deprecated1 [[gnu::deprecated]] (); // expected-note {{here}}
     48 [[gnu::deprecated("custom message")]] void deprecated2(); // expected-note {{here}}
     49 void deprecated3() {
     50   deprecated1(); // expected-warning {{deprecated}}
     51   deprecated2(); // expected-warning {{custom message}}
     52 }
     53 
     54 [[gnu::naked(1,2,3)]] void naked(); // expected-error {{takes no arguments}}
     55 
     56 void nonnull [[gnu::nonnull]] (); // expected-warning {{applied to function with no pointer arguments}}
     57 
     58 // [[gnu::noreturn]] appertains to a declaration, and marks the innermost
     59 // function declarator in that declaration as being noreturn.
     60 int noreturn [[gnu::noreturn]]; // expected-warning {{'noreturn' only applies to function types}}
     61 int noreturn_fn_1();
     62 int noreturn_fn_2() [[gnu::noreturn]]; // expected-warning {{cannot be applied to a type}}
     63 int noreturn_fn_3 [[gnu::noreturn]] ();
     64 [[gnu::noreturn]] int noreturn_fn_4();
     65 int (*noreturn_fn_ptr_1 [[gnu::noreturn]])() = &noreturn_fn_1; // expected-error {{cannot initialize}}
     66 int (*noreturn_fn_ptr_2 [[gnu::noreturn]])() = &noreturn_fn_3;
     67 [[gnu::noreturn]] int (*noreturn_fn_ptr_3)() = &noreturn_fn_1; // expected-error {{cannot initialize}}
     68 [[gnu::noreturn]] int (*noreturn_fn_ptr_4)() = &noreturn_fn_3;
     69 
     70 struct [[gnu::packed]] packed { char c; int n; };
     71 static_assert(sizeof(packed) == sizeof(char) + sizeof(int), "not packed");
     72