1// RUN: %clang_cc1 -fsyntax-only -verify %s 2// RUN: %clang_cc1 -fsyntax-only -verify -Wretained-language-linkage -DW_RETAINED_LANGUAGE_LINKAGE %s 3extern "C" { 4 extern "C" void f(int); 5} 6 7extern "C++" { 8 extern "C++" int& g(int); 9 float& g(); 10} 11double& g(double); 12 13void test(int x, double d) { 14 f(x); 15 float &f1 = g(); 16 int& i1 = g(x); 17 double& d1 = g(d); 18} 19 20extern "C" int foo; 21extern "C" int foo; 22 23extern "C" const int bar; 24extern "C" int const bar; 25 26// <rdar://problem/6895431> 27extern "C" struct bar d; 28extern struct bar e; 29 30extern "C++" { 31 namespace N0 { 32 struct X0 { 33 int foo(int x) { return x; } 34 }; 35 } 36} 37 38// PR5430 39namespace pr5430 { 40 extern "C" void func(void); 41} 42using namespace pr5430; 43extern "C" void pr5430::func(void) { } 44 45// PR5405 46int f2(char *) 47{ 48 return 0; 49} 50 51extern "C" 52{ 53 int f2(int) 54 { 55 return f2((char *)0); 56 } 57} 58 59namespace PR5405 { 60 int f2b(char *) { 61 return 0; 62 } 63 64 extern "C" { 65 int f2b(int) { 66 return f2b((char *)0); // ok 67 } 68 } 69} 70 71// PR6991 72extern "C" typedef int (*PutcFunc_t)(int); 73 74 75// PR7859 76extern "C" void pr7859_a(int) {} // expected-note {{previous definition}} 77extern "C" void pr7859_a(int) {} // expected-error {{redefinition}} 78 79extern "C" void pr7859_b() {} // expected-note {{previous definition}} 80extern "C" void pr7859_b(int) {} // expected-error {{conflicting}} 81 82extern "C" void pr7859_c(short) {} // expected-note {{previous definition}} 83extern "C" void pr7859_c(int) {} // expected-error {{conflicting}} 84 85// <rdar://problem/8318976> 86extern "C" { 87 struct s0 { 88 private: 89 s0(); 90 s0(const s0 &); 91 }; 92} 93 94//PR7754 95extern "C++" template <class T> int pr7754(T param); 96 97namespace N { 98 int value; 99} 100 101extern "C++" using N::value; 102 103// PR7076 104extern "C" const char *Version_string = "2.9"; 105 106extern "C" { 107 extern const char *Version_string2 = "2.9"; 108} 109 110namespace PR9162 { 111 extern "C" { 112 typedef struct _ArtsSink ArtsSink; 113 struct _ArtsSink { 114 int sink; 115 }; 116 } 117 int arts_sink_get_type() 118 { 119 return sizeof(ArtsSink); 120 } 121} 122 123namespace pr14958 { 124 namespace js { extern int ObjectClass; } 125 extern "C" { 126 namespace js {} 127 } 128 int js::ObjectClass; 129} 130 131extern "C" void PR16167; // expected-error {{variable has incomplete type 'void'}} 132extern void PR16167_0; // expected-error {{variable has incomplete type 'void'}} 133 134// PR7927 135enum T_7927 { 136 E_7927 137}; 138 139extern "C" void f_pr7927(int); 140 141namespace { 142 extern "C" void f_pr7927(int); 143 144 void foo_pr7927() { 145 f_pr7927(E_7927); 146 f_pr7927(0); 147 ::f_pr7927(E_7927); 148 ::f_pr7927(0); 149 } 150} 151 152void bar_pr7927() { 153 f_pr7927(E_7927); 154 f_pr7927(0); 155 ::f_pr7927(E_7927); 156 ::f_pr7927(0); 157} 158 159namespace PR17337 { 160 extern "C++" { 161 class Foo; 162 extern "C" int bar3(Foo *y); 163 class Foo { 164 int x; 165 friend int bar3(Foo *y); 166#ifdef W_RETAINED_LANGUAGE_LINKAGE 167// expected-note@-5 {{previous declaration is here}} 168// expected-warning@-3 {{retaining previous language linkage}} 169#endif 170 }; 171 extern "C" int bar3(Foo *y) { 172 return y->x; 173 } 174 } 175} 176