clang/test/SemaCXX/attr-gnu.cpp

   1 // RUN: %clang_cc1 -std=gnu++17 -fsyntax-only -fms-compatibility -verify %s
   2
   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 template<typename T> struct A {
  16   int x[sizeof(T)] __attribute((vector_size(8))); // expected-error {{invalid vector element type 'int[sizeof(T)]'}}
  17 };
  18
  19 typedef int myvect[4] __attribute__((vector_size(16))); // expected-error {{invalid vector element type 'int[4]'}}
  20 void foo(myvect *in, myvect *out) { (*out)[0] = (*in)[0]; }
  21
  22 namespace {
  23 class B {
  24 public:
  25   virtual void test() {}
  26   virtual void test2() {}
  27   virtual void test3() {}
  28 };
  29
  30 class D : public B {
  31 public:
  32   void test() __attribute__((deprecated)) final {} // expected-warning {{GCC does not allow an attribute in this position on a function declaration}}
  33   void test2() [[]] override {} // Ok
  34   void test3() __attribute__((cf_unknown_transfer)) override {} // Ok, not known to GCC.
  35 };
  36 }
  37
  38 template<typename T>
  39 union Tu { T b; } __attribute__((transparent_union)); // expected-warning {{'transparent_union' attribute ignored}}
  40
  41 template<typename T>
  42 union Tu2 { int x; T b; } __attribute__((transparent_union)); // expected-warning {{'transparent_union' attribute ignored}}
  43
  44 union Tu3 { int x; } __attribute((transparent_union)); // expected-warning {{'transparent_union' attribute ignored}}
  45
  46 void tuTest1(Tu<int> u); // expected-note {{candidate function not viable: no known conversion from 'int' to 'Tu<int>' for 1st argument}}
  47 void tuTest2(Tu3 u); // expected-note {{candidate function not viable: no known conversion from 'int' to 'Tu3' for 1st argument}}
  48 void tu() {
  49   int x = 2;
  50   tuTest1(x); // expected-error {{no matching function for call to 'tuTest1'}}
  51   tuTest2(x); // expected-error {{no matching function for call to 'tuTest2'}}
  52 }
  53
  54 [[gnu::__const__]] int f2() { return 12; }
  55 [[__gnu__::__const__]] int f3() { return 12; }
  56 [[using __gnu__ : __const__]] int f4() { return 12; }
  57
  58 static_assert(__has_cpp_attribute(gnu::__const__));
  59 static_assert(__has_cpp_attribute(__gnu__::__const__));