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