clang/test/SemaCXX/attr-gnu.cpp

   1 // RUN: %clang_cc1 -std=gnu++03 -fsyntax-only -fms-compatibility -Wno-c++11-extensions -Wno-c++17-extensions -verify %s
   2 // RUN: %clang_cc1 -std=gnu++17 -fsyntax-only -fms-compatibility -verify %s
   3
   4 void f() {
   5   // GNU-style attributes are prohibited in this position.
   6   auto P = new int * __attribute__((vector_size(8))); // expected-error {{an attribute list cannot appear here}} \
   7                                                       // expected-error {{invalid vector element type 'int *'}}
   8
   9   // Ensure that MS type attribute keywords are still supported in this
  10   // position.
  11   auto P2 = new int * __sptr; // Ok
  12 }
  13
  14 void g(int a[static [[]] 5]); // expected-error {{static array size is a C99 feature, not permitted in C++}}
  15
  16 template<typename T> struct A {
  17   int x[sizeof(T)] __attribute((vector_size(8))); // expected-error {{invalid vector element type 'int[sizeof(T)]'}}
  18 };
  19
  20 typedef int myvect[4] __attribute__((vector_size(16))); // expected-error {{invalid vector element type 'int[4]'}}
  21 void foo(myvect *in, myvect *out) { (*out)[0] = (*in)[0]; }
  22
  23 namespace {
  24 class B {
  25 public:
  26   virtual void test() {}
  27   virtual void test2() {}
  28   virtual void test3() {}
  29 };
  30
  31 class D : public B {
  32 public:
  33   void test() __attribute__((deprecated)) final {} // expected-warning {{GCC does not allow an attribute in this position on a function declaration}}
  34   void test2() [[]] override {} // Ok
  35   void test3() __attribute__((cf_unknown_transfer)) override {} // Ok, not known to GCC.
  36 };
  37 }
  38
  39 template<typename T>
  40 union Tu { T b; } __attribute__((transparent_union)); // expected-warning {{'transparent_union' attribute ignored}}
  41
  42 template<typename T>
  43 union Tu2 { int x; T b; } __attribute__((transparent_union)); // expected-warning {{'transparent_union' attribute ignored}}
  44
  45 union Tu3 { int x; } __attribute((transparent_union)); // expected-warning {{'transparent_union' attribute ignored}}
  46
  47 void tuTest1(Tu<int> u); // expected-note {{candidate function not viable: no known conversion from 'int' to 'Tu<int>' for 1st argument}}
  48 void tuTest2(Tu3 u); // expected-note {{candidate function not viable: no known conversion from 'int' to 'Tu3' for 1st argument}}
  49 void tu() {
  50   int x = 2;
  51   tuTest1(x); // expected-error {{no matching function for call to 'tuTest1'}}
  52   tuTest2(x); // expected-error {{no matching function for call to 'tuTest2'}}
  53 }
  54
  55 [[gnu::__const__]] int f2() { return 12; }
  56 [[__gnu__::__const__]] int f3() { return 12; }
  57 [[using __gnu__ : __const__]] int f4() { return 12; }
  58
  59 static_assert(__has_cpp_attribute(gnu::__const__));
  60 static_assert(__has_cpp_attribute(__gnu__::__const__));