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 {
40  export void f() {}
41}
42
43export struct T {} t;
44#elif TEST == 3
45int use_a = a; // expected-error {{declaration of 'a' must be imported from module 'foo' before it is required}}
46// expected-note@-13 {{previous}}
47
48#undef foo
49import foo;
50
51export {} // expected-error {{export declaration cannot be empty}}
52export { ; }
53export { static_assert(true); }
54
55int use_b = b;
56int use_n = n; // FIXME: this should not be visible, because it is not exported
57
58extern int n;
59static_assert(&n != p);
60#endif
61
62
63#if TEST == 1
64struct S {
65  export int n; // expected-error {{expected member name or ';'}}
66  export static int n; // expected-error {{expected member name or ';'}}
67};
68#endif
69
70// FIXME: Exports of declarations without external linkage are disallowed.
71// Exports of declarations with non-external-linkage types are disallowed.
72
73// Cannot export within another export. This isn't precisely covered by the
74// language rules right now, but (per personal correspondence between zygoloid
75// and gdr) is the intent.
76#if TEST == 1
77export {
78  extern "C++" {
79    namespace NestedExport {
80      export { // expected-error {{appears within another export}}
81        int q;
82      }
83    }
84  }
85}
86#endif
87