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