| // 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 definition 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 {}; |
| 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}} |