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