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      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";
     92 
     93 namespace PR9162 {
     94   extern "C" {
     95     typedef struct _ArtsSink ArtsSink;
     96     struct _ArtsSink {
     97       int sink;
     98     };
     99   }
    100   int arts_sink_get_type()
    101   {
    102     return sizeof(ArtsSink);
    103   }
    104 }
    105