clang/test/SemaCXX/cxx11-gnu-attrs.cpp

   1 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -std=c++11 -Wno-gcc-compat -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 {{'fastcall' calling convention is not supported for this target}}
  13 [[gnu::fastcall]] [[gnu::stdcall]] void pr17424_2();
  14 // expected-warning@-1 {{'fastcall' calling convention is not supported for this target}}
  15 // expected-warning@-2 {{'stdcall' calling convention is not supported for this target}}
  16 [[gnu::fastcall]] __stdcall void pr17424_3();
  17 // expected-warning@-1 {{'fastcall' calling convention is not supported for this target}}
  18 // expected-warning@-2 {{'__stdcall' calling convention is not supported for this target}}
  19 [[gnu::fastcall]] void pr17424_4() [[gnu::stdcall]];
  20 // expected-warning@-1 {{'fastcall' calling convention is not supported for this target}}
  21 // expected-warning@-2 {{'stdcall' calling convention is not supported for this target}}
  22 void pr17424_5 [[gnu::fastcall]]();
  23 // expected-warning@-1 {{'fastcall' calling convention is not supported for this target}}
  24
  25 // Valid cases.
  26
  27 void aliasb [[gnu::alias("_Z6alias1v")]] ();
  28 void alias1() {}
  29 void aliasa [[gnu::alias("_Z6alias1v")]] ();
  30
  31 extern struct PR22493Ty {
  32 } PR22493 [[gnu::alias("_ZN7pcrecpp2RE6no_argE")]];
  33
  34 [[gnu::aligned(8)]] int aligned;
  35 void aligned_fn [[gnu::aligned(32)]] ();
  36 struct [[gnu::aligned(8)]] aligned_struct {};
  37
  38 void always_inline [[gnu::always_inline]] ();
  39
  40 __thread int tls_model [[gnu::tls_model("local-exec")]];
  41
  42 void cleanup(int *p) {
  43   int n [[gnu::cleanup(cleanup)]];
  44 }
  45
  46 void deprecated1 [[gnu::deprecated]] (); // expected-note {{here}}
  47 [[gnu::deprecated("custom message")]] void deprecated2(); // expected-note {{here}}
  48 void deprecated3() {
  49   deprecated1(); // expected-warning {{deprecated}}
  50   deprecated2(); // expected-warning {{custom message}}
  51 }
  52
  53 [[gnu::naked(1,2,3)]] void naked(); // expected-error {{takes no arguments}}
  54
  55 void nonnull [[gnu::nonnull]] (); // expected-warning {{applied to function with no pointer arguments}}
  56
  57 // [[gnu::noreturn]] appertains to a declaration, and marks the innermost
  58 // function declarator in that declaration as being noreturn.
  59 int noreturn [[gnu::noreturn]]; // expected-warning {{'noreturn' only applies to function types}}
  60 int noreturn_fn_1();
  61 int noreturn_fn_2() [[gnu::noreturn]]; // expected-warning {{cannot be applied to a type}}
  62 int noreturn_fn_3 [[gnu::noreturn]] ();
  63 [[gnu::noreturn]] int noreturn_fn_4();
  64 int (*noreturn_fn_ptr_1 [[gnu::noreturn]])() = &noreturn_fn_1; // expected-error {{cannot initialize}}
  65 int (*noreturn_fn_ptr_2 [[gnu::noreturn]])() = &noreturn_fn_3;
  66 [[gnu::noreturn]] int (*noreturn_fn_ptr_3)() = &noreturn_fn_1; // expected-error {{cannot initialize}}
  67 [[gnu::noreturn]] int (*noreturn_fn_ptr_4)() = &noreturn_fn_3;
  68
  69 struct [[gnu::packed]] packed { char c; int n; };
  70 static_assert(sizeof(packed) == sizeof(char) + sizeof(int), "not packed");