| // RUN: %clang_cc1 -fsyntax-only -verify %s |
| |
| namespace test1 { |
| extern "C" { |
| void test1_f() { |
| void test1_g(int); |
| } |
| } |
| } |
| int test1_g(int); |
| |
| namespace test2 { |
| extern "C" { |
| void test2_f() { |
| extern int test2_x; // expected-note {{declared with C language linkage here}} |
| } |
| } |
| } |
| float test2_x; // expected-error {{declaration of 'test2_x' in global scope conflicts with declaration with C language linkage}} |
| |
| namespace test3 { |
| extern "C" { |
| void test3_f() { |
| extern int test3_b; // expected-note {{previous declaration is here}} |
| } |
| } |
| extern "C" { |
| float test3_b; // expected-error {{redefinition of 'test3_b' with a different type: 'float' vs 'int'}} |
| } |
| } |
| |
| namespace N { |
| extern "C" { |
| void test4_f() { |
| extern int test4_b; // expected-note {{declared with C language linkage here}} |
| } |
| } |
| } |
| static float test4_b; // expected-error {{declaration of 'test4_b' in global scope conflicts with declaration with C language linkage}} |
| |
| extern "C" { |
| void test4c_f() { |
| extern int test4_c; // expected-note {{previous}} |
| } |
| } |
| static float test4_c; // expected-error {{redefinition of 'test4_c' with a different type: 'float' vs 'int'}} |
| |
| namespace N { |
| extern "C" { |
| void test5_f() { |
| extern int test5_b; // expected-note {{declared with C language linkage here}} |
| } |
| } |
| } |
| extern "C" { |
| static float test5_b; // expected-error {{declaration of 'test5_b' in global scope conflicts with declaration with C language linkage}} |
| } |
| |
| extern "C" { |
| void test5c_f() { |
| extern int test5_c; // expected-note {{previous}} |
| } |
| } |
| extern "C" { |
| static float test5_c; // expected-error {{redefinition of 'test5_c' with a different type: 'float' vs 'int'}} |
| } |
| |
| extern "C" { |
| void f() { |
| extern int test6_b; |
| } |
| } |
| namespace foo { |
| extern "C" { |
| static float test6_b; |
| extern float test6_b; |
| } |
| } |
| |
| namespace linkage { |
| namespace redecl { |
| extern "C" { |
| static void linkage_redecl(); |
| static void linkage_redecl(int); |
| void linkage_redecl(); // ok, still not extern "C" |
| void linkage_redecl(int); // ok, still not extern "C" |
| void linkage_redecl(float); // expected-note {{previous}} |
| void linkage_redecl(double); // expected-error {{conflicting types}} |
| } |
| } |
| namespace from_outer { |
| void linkage_from_outer_1(); // expected-note {{previous}} |
| void linkage_from_outer_2(); // expected-note {{previous}} |
| extern "C" { |
| void linkage_from_outer_1(int); |
| void linkage_from_outer_1(); // expected-error {{different language linkage}} |
| void linkage_from_outer_2(); // expected-error {{different language linkage}} |
| } |
| } |
| namespace mixed { |
| extern "C" { |
| void linkage_mixed_1(); |
| static void linkage_mixed_1(int); |
| |
| static void linkage_mixed_2(int); |
| void linkage_mixed_2(); |
| } |
| } |
| namespace across_scopes { |
| namespace X { |
| extern "C" void linkage_across_scopes_f() { |
| void linkage_across_scopes_g(); // expected-note {{previous}} |
| } |
| } |
| namespace Y { |
| extern "C" void linkage_across_scopes_g(int); // expected-error {{conflicting}} |
| } |
| } |
| } |
| |
| int lookup_in_global_f; // expected-note {{here}} |
| namespace lookup_in_global { |
| void lookup_in_global_f(); |
| void lookup_in_global_g(); |
| extern "C" { |
| void lookup_in_global_f(int); // expected-error {{conflicts with declaration in global scope}} |
| void lookup_in_global_g(int); // expected-note {{here}} |
| } |
| } |
| int lookup_in_global_g; // expected-error {{conflicts with declaration with C language linkage}} |
| |
| namespace N1 { |
| extern "C" int different_kind_1; // expected-note {{here}} |
| extern "C" void different_kind_2(); // expected-note {{here}} |
| } |
| namespace N2 { |
| extern "C" void different_kind_1(); // expected-error {{different kind of symbol}} |
| extern "C" int different_kind_2; // expected-error {{different kind of symbol}} |
| } |
| |
| // We allow all these even though the standard says they are ill-formed. |
| extern "C" { |
| struct stat {}; // expected-warning{{empty struct has size 0 in C, size 1 in C++}} |
| void stat(struct stat); |
| } |
| namespace X { |
| extern "C" { |
| void stat(struct ::stat); |
| } |
| } |
| int stat(int *p); |
| void global_fn_vs_extern_c_var_1(); |
| namespace X { |
| extern "C" int global_fn_vs_extern_c_var_1; |
| extern "C" int global_fn_vs_extern_c_var_2; |
| } |
| void global_fn_vs_extern_c_var_2(); |
| void global_fn_vs_extern_c_fn_1(); |
| namespace X { |
| extern "C" int global_fn_vs_extern_c_fn_1(int); |
| extern "C" int global_fn_vs_extern_c_fn_2(int); |
| } |
| void global_fn_vs_extern_c_fn_2(); |
| extern "C" void name_with_using_decl_1(int); |
| namespace using_decl { |
| void name_with_using_decl_1(); |
| void name_with_using_decl_2(); |
| void name_with_using_decl_3(); |
| } |
| using using_decl::name_with_using_decl_1; |
| using using_decl::name_with_using_decl_2; |
| extern "C" void name_with_using_decl_2(int); |
| extern "C" void name_with_using_decl_3(int); |
| using using_decl::name_with_using_decl_3; |
| |
| // We do not allow a global variable and an extern "C" function to have the same |
| // name, because such entities may have the same mangled name. |
| int global_var_vs_extern_c_fn_1; // expected-note {{here}} |
| namespace X { |
| extern "C" void global_var_vs_extern_c_fn_1(); // expected-error {{conflicts with declaration in global scope}} |
| extern "C" void global_var_vs_extern_c_fn_2(); // expected-note {{here}} |
| } |
| int global_var_vs_extern_c_fn_2; // expected-error {{conflicts with declaration with C language linkage}} |
| int global_var_vs_extern_c_var_1; // expected-note {{here}} |
| namespace X { |
| extern "C" double global_var_vs_extern_c_var_1; // expected-error {{conflicts with declaration in global scope}} |
| extern "C" double global_var_vs_extern_c_var_2; // expected-note {{here}} |
| } |
| int global_var_vs_extern_c_var_2; // expected-error {{conflicts with declaration with C language linkage}} |
| |
| template <class T> struct pr5065_n1 {}; |
| extern "C" { |
| union pr5065_1 {}; // expected-warning{{empty union has size 0 in C, size 1 in C++}} |
| struct pr5065_2 { int: 0; }; // expected-warning{{struct has size 0 in C, size 1 in C++}} |
| struct pr5065_3 {}; // expected-warning{{empty struct has size 0 in C, size 1 in C++}} |
| struct pr5065_4 { // expected-warning{{empty struct has size 0 in C, size 1 in C++}} |
| struct Inner {}; // expected-warning{{empty struct has size 0 in C, size 1 in C++}} |
| }; |
| // These should not warn |
| class pr5065_n3 {}; |
| pr5065_n1<int> pr5065_v; |
| struct pr5065_n4 { void m() {} }; |
| struct pr5065_n5 : public pr5065_3 {}; |
| struct pr5065_n6 : public virtual pr5065_3 {}; |
| } |
| struct pr5065_n7 {}; |
| |
| namespace tag_hiding { |
| namespace namespace_with_injected_name { |
| class Boo { |
| friend struct ExternCStruct1; |
| }; |
| void ExternCStruct4(); // expected-note 2{{candidate}} |
| } |
| |
| class Baz { |
| friend struct ExternCStruct2; |
| friend void ExternCStruct3(); |
| }; |
| |
| using namespace namespace_with_injected_name; |
| |
| extern "C" { |
| struct ExternCStruct1; |
| struct ExternCStruct2; |
| struct ExternCStruct3; |
| struct ExternCStruct4; // expected-note {{candidate}} |
| } |
| ExternCStruct1 *p1; |
| ExternCStruct2 *p2; |
| ExternCStruct3 *p3; |
| ExternCStruct4 *p4; // expected-error {{ambiguous}} |
| |
| extern "C" { |
| struct ExternCStruct1; |
| struct ExternCStruct2; |
| struct ExternCStruct3; |
| struct ExternCStruct4; // expected-note {{candidate}} |
| } |
| ExternCStruct1 *q1 = p1; |
| ExternCStruct2 *q2 = p2; |
| ExternCStruct3 *q3 = p3; |
| ExternCStruct4 *q4 = p4; // expected-error {{ambiguous}} |
| } |
| |
| namespace PR35697 { |
| typedef struct {} *ReturnStruct; |
| extern "C" ReturnStruct PR35697_f(); |
| extern "C" ReturnStruct PR35697_v; |
| ReturnStruct PR35697_f(); |
| ReturnStruct PR35697_v; |
| |
| namespace { |
| extern "C" ReturnStruct PR35697_f(); |
| extern "C" ReturnStruct PR35697_v; |
| void q() { |
| extern ReturnStruct PR35697_f(); |
| extern ReturnStruct PR35697_v; |
| } |
| } |
| } |