1// RUN:     %clang_cc1 -std=c++1z -fmodules-ts -emit-module-interface %s -o %t.0.pcm -verify -DTEST=0
2// RUN:     %clang_cc1 -std=c++1z -fmodules-ts -emit-module-interface %s -o %t.1.pcm -verify -DTEST=1
3// RUN:     %clang_cc1 -std=c++1z -fmodules-ts -emit-module-interface %s -fmodule-file=%t.0.pcm -o %t.2.pcm -verify -DTEST=2
4// RUN:     %clang_cc1 -std=c++1z -fmodules-ts -emit-module-interface %s -fmodule-file=%t.0.pcm -o %t.3.pcm -verify -Dfoo=bar -DTEST=3
5
6#if TEST == 0
7// expected-no-diagnostics
8#endif
9
10export module foo;
11#if TEST == 2
12// expected-error@-2 {{redefinition of module 'foo'}}
13// [email protected]:* {{loaded from}}
14#endif
15
16static int m;
17#if TEST == 2
18// expected-error@-2 {{redefinition of '}}
19// expected-note@-3 {{unguarded header; consider using #ifdef guards or #pragma once}}
20// FIXME: We should drop the "header from" in this diagnostic.
21// [email protected]:1 {{'{{.*}}modules-ts.cppm' included multiple times, additional include site in header from module 'foo'}}
22#endif
23int n;
24#if TEST == 2
25// expected-error@-2 {{redefinition of '}}
26// expected-note@-3 {{unguarded header; consider using #ifdef guards or #pragma once}}
27// FIXME: We should drop the "header from" in this diagnostic.
28// [email protected]:1 {{'{{.*}}modules-ts.cppm' included multiple times, additional include site in header from module 'foo'}}
29#endif
30
31#if TEST == 0
32export {
33  int a;
34  int b;
35  constexpr int *p = &n;
36}
37export int c;
38
39namespace N {
40export void f() {}
41} // namespace N
42
43export struct T {
44} t;
45#elif TEST == 3
46int use_a = a; // expected-error {{declaration of 'a' must be imported from module 'foo' before it is required}}
47// expected-note@-14 {{declaration here is not visible}}
48
49#undef foo
50import foo;
51
52export {} // expected-error {{export declaration cannot be empty}}
53export {  // expected-note {{begins here}}
54  ;       // expected-warning {{ISO C++20 does not permit an empty declaration to appear in an export block}}
55}
56export {               // expected-note {{begins here}}
57  static_assert(true); // expected-warning {{ISO C++20 does not permit a static_assert declaration to appear in an export block}}
58}
59
60int use_b = b;
61int use_n = n; // FIXME: this should not be visible, because it is not exported
62
63extern int n;
64static_assert(&n != p);
65#endif
66
67#if TEST == 1
68struct S {
69  export int n;        // expected-error {{expected member name or ';'}}
70  export static int n; // expected-error {{expected member name or ';'}}
71};
72#endif
73
74// FIXME: Exports of declarations without external linkage are disallowed.
75// Exports of declarations with non-external-linkage types are disallowed.
76
77// Cannot export within another export. This isn't precisely covered by the
78// language rules right now, but (per personal correspondence between zygoloid
79// and gdr) is the intent.
80#if TEST == 1
81export { // expected-note {{export block begins here}}
82  extern "C++" {
83  namespace NestedExport {
84  export { // expected-error {{appears within another export}}
85    int q;
86  }
87  } // namespace NestedExport
88  }
89}
90#endif
91