1 // RUN: %clang_cc1 -std=gnu++17 -fsyntax-only -fms-compatibility -verify %s
2 
f()3 void f() {
4   // GNU-style attributes are prohibited in this position.
5   auto P = new int * __attribute__((vector_size(8))); // expected-error {{an attribute list cannot appear here}} \
6                                                       // expected-error {{invalid vector element type 'int *'}}
7 
8   // Ensure that MS type attribute keywords are still supported in this
9   // position.
10   auto P2 = new int * __sptr; // Ok
11 }
12 
13 void g(int a[static [[]] 5]); // expected-error {{static array size is a C99 feature, not permitted in C++}}
14 
15 namespace {
16 class B {
17 public:
test()18   virtual void test() {}
test2()19   virtual void test2() {}
test3()20   virtual void test3() {}
21 };
22 
23 class D : public B {
24 public:
test()25   void test() __attribute__((deprecated)) final {} // expected-warning {{GCC does not allow an attribute in this position on a function declaration}}
test2()26   void test2() [[]] override {} // Ok
test3()27   void test3() __attribute__((cf_unknown_transfer)) override {} // Ok, not known to GCC.
28 };
29 }
30 
31 template<typename T>
32 union Tu { T b; } __attribute__((transparent_union)); // expected-warning {{'transparent_union' attribute ignored}}
33 
34 template<typename T>
35 union Tu2 { int x; T b; } __attribute__((transparent_union)); // expected-warning {{'transparent_union' attribute ignored}}
36 
37 union Tu3 { int x; } __attribute((transparent_union)); // expected-warning {{'transparent_union' attribute ignored}}
38 
39 void tuTest1(Tu<int> u); // expected-note {{candidate function not viable: no known conversion from 'int' to 'Tu<int>' for 1st argument}}
40 void tuTest2(Tu3 u); // expected-note {{candidate function not viable: no known conversion from 'int' to 'Tu3' for 1st argument}}
tu()41 void tu() {
42   int x = 2;
43   tuTest1(x); // expected-error {{no matching function for call to 'tuTest1'}}
44   tuTest2(x); // expected-error {{no matching function for call to 'tuTest2'}}
45 }
46 
f2()47 [[gnu::__const__]] int f2() { return 12; }
f3()48 [[__gnu__::__const__]] int f3() { return 12; }
f4()49 [[using __gnu__ : __const__]] int f4() { return 12; }
50 
51 static_assert(__has_cpp_attribute(gnu::__const__));
52 static_assert(__has_cpp_attribute(__gnu__::__const__));
53