| 1 | // RUN: %clang_cc1 -Wreturn-type -fsyntax-only -std=c++11 -verify %s |
|---|
| 2 | |
|---|
| 3 | class A { |
|---|
| 4 | public: |
|---|
| 5 | A(const A&); |
|---|
| 6 | }; |
|---|
| 7 | |
|---|
| 8 | struct S { |
|---|
| 9 | int i; |
|---|
| 10 | double d; |
|---|
| 11 | |
|---|
| 12 | virtual void B() {} |
|---|
| 13 | }; |
|---|
| 14 | |
|---|
| 15 | union U { |
|---|
| 16 | struct { |
|---|
| 17 | int i; |
|---|
| 18 | virtual void B() {} // Can only do this in C++11 |
|---|
| 19 | } t; |
|---|
| 20 | }; |
|---|
| 21 | |
|---|
| 22 | struct S2 { |
|---|
| 23 | int i; |
|---|
| 24 | double d; |
|---|
| 25 | }; |
|---|
| 26 | |
|---|
| 27 | extern "C" U f3( void ); // expected-warning {{'f3' has C-linkage specified, but returns user-defined type 'U' which is incompatible with C}} |
|---|
| 28 | extern "C" S f0(void); // expected-warning {{'f0' has C-linkage specified, but returns user-defined type 'S' which is incompatible with C}} |
|---|
| 29 | extern "C" A f4( void ); // expected-warning {{'f4' has C-linkage specified, but returns user-defined type 'A' which is incompatible with C}} |
|---|
| 30 | |
|---|
| 31 | // These should all be fine |
|---|
| 32 | extern "C" S2 f5( void ); |
|---|
| 33 | extern "C" void f2( A x ); |
|---|
| 34 | extern "C" void f6( S s ); |
|---|
| 35 | extern "C" void f7( U u ); |
|---|
| 36 | extern "C" double f8(void); |
|---|
| 37 | extern "C" long long f11( void ); |
|---|
| 38 | extern "C" A *f10( void ); |
|---|
| 39 | |
|---|
| 40 | extern "C" struct mypodstruct f12(); // expected-warning {{'f12' has C-linkage specified, but returns incomplete type 'struct mypodstruct' which could be incompatible with C}} |
|---|
| 41 | |
|---|
| 42 | namespace test2 { |
|---|
| 43 | // FIXME: we should probably suppress the first warning as the second one |
|---|
| 44 | // is more precise. |
|---|
| 45 | // For now this tests that a second 'extern "C"' is not necessary to trigger |
|---|
| 46 | // the warning. |
|---|
| 47 | struct A; |
|---|
| 48 | extern "C" A f(void); // expected-warning {{'f' has C-linkage specified, but returns incomplete type 'test2::A' which could be incompatible with C}} |
|---|
| 49 | struct A { |
|---|
| 50 | A(const A&); |
|---|
| 51 | }; |
|---|
| 52 | A f(void); // no warning. warning is already issued on first declaration. |
|---|
| 53 | } |
|---|
| 54 | |
|---|
| 55 | namespace test3 { |
|---|
| 56 | struct A { |
|---|
| 57 | A(const A&); |
|---|
| 58 | }; |
|---|
| 59 | extern "C" { |
|---|
| 60 | // Don't warn for static functions. |
|---|
| 61 | static A f(void); |
|---|
| 62 | } |
|---|
| 63 | } |
|---|
| 64 | |
|---|
| 65 | // rdar://13364028 |
|---|
| 66 | namespace rdar13364028 { |
|---|
| 67 | class A { |
|---|
| 68 | public: |
|---|
| 69 | virtual int x(); |
|---|
| 70 | }; |
|---|
| 71 | |
|---|
| 72 | extern "C" { |
|---|
| 73 | #pragma clang diagnostic push |
|---|
| 74 | #pragma clang diagnostic ignored "-Wreturn-type-c-linkage" |
|---|
| 75 | A xyzzy(); |
|---|
| 76 | #pragma clang diagnostic pop |
|---|
| 77 | A bbb(); // expected-warning {{'bbb' has C-linkage specified, but returns user-defined type 'rdar13364028::A' which is incompatible with C}} |
|---|
| 78 | A ccc() { // expected-warning {{'ccc' has C-linkage specified, but returns user-defined type 'rdar13364028::A' which is incompatible with C}} |
|---|
| 79 | return A(); |
|---|
| 80 | }; |
|---|
| 81 | } |
|---|
| 82 | |
|---|
| 83 | A xyzzy(); |
|---|
| 84 | |
|---|
| 85 | A xyzzy() |
|---|
| 86 | { |
|---|
| 87 | return A(); |
|---|
| 88 | } |
|---|
| 89 | |
|---|
| 90 | A bbb() |
|---|
| 91 | { |
|---|
| 92 | return A(); |
|---|
| 93 | } |
|---|
| 94 | |
|---|
| 95 | A bbb(); |
|---|
| 96 | |
|---|
| 97 | A ccc(); |
|---|
| 98 | } |
|---|
| 99 | |
|---|