test/SemaCXX/linkage-spec.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s
   2 extern "C" {
   3   extern "C" void f(int);
   4 }
   5
   6 extern "C++" {
   7   extern "C++" int& g(int);
   8   float& g();
   9 }
  10 double& g(double);
  11
  12 void test(int x, double d) {
  13   f(x);
  14   float &f1 = g();
  15   int& i1 = g(x);
  16   double& d1 = g(d);
  17 }
  18
  19 extern "C" int foo;
  20 extern "C" int foo;
  21
  22 extern "C" const int bar;
  23 extern "C" int const bar;
  24
  25 // <rdar://problem/6895431>
  26 extern "C" struct bar d;
  27 extern struct bar e;
  28
  29 extern "C++" {
  30   namespace N0 {
  31     struct X0 {
  32       int foo(int x) { return x; }
  33     };
  34   }
  35 }
  36
  37 // PR5430
  38 namespace pr5430 {
  39   extern "C" void func(void);
  40 }
  41 using namespace pr5430;
  42 extern "C" void pr5430::func(void) { }
  43
  44 // PR5404
  45 int f2(char *)
  46 {
  47         return 0;
  48 }
  49
  50 extern "C"
  51 {
  52     int f2(int)
  53     {
  54         return f2((char *)0);
  55     }
  56 }
  57
  58 // PR6991
  59 extern "C" typedef int (*PutcFunc_t)(int);
  60
  61
  62 // PR7859
  63 extern "C" void pr7859_a(int) {} // expected-note {{previous definition}}
  64 extern "C" void pr7859_a(int) {} // expected-error {{redefinition}}
  65
  66 extern "C" void pr7859_b() {} // expected-note {{previous definition}}
  67 extern "C" void pr7859_b(int) {} // expected-error {{conflicting}}
  68
  69 extern "C" void pr7859_c(short) {} // expected-note {{previous definition}}
  70 extern "C" void pr7859_c(int) {} // expected-error {{conflicting}}
  71
  72 // <rdar://problem/8318976>
  73 extern "C" {
  74   struct s0 {
  75   private:
  76     s0();
  77     s0(const s0 &);
  78   };
  79 }
  80
  81 //PR7754
  82 extern "C++" template <class T> int pr7754(T param);
  83
  84 namespace N {
  85   int value;
  86 }
  87
  88 extern "C++" using N::value;
  89
  90 // PR7076
  91 extern "C" const char *Version_string = "2.9";