1 // RUN: %clang_cc1 -fms-compatibility -fms-extensions -fsyntax-only -verify -std=c++11 %s
2 // MSVC produces similar diagnostics.
3
foo()4 __declspec(selectany) void foo() { } // expected-error{{'selectany' can only be applied to data items with external linkage}}
5
6 __declspec(selectany) int x1 = 1;
7
8 const __declspec(selectany) int x2 = 2; // expected-error{{'selectany' can only be applied to data items with external linkage}}
9
10 extern const __declspec(selectany) int x3 = 3;
11
12 extern const int x4;
13 const __declspec(selectany) int x4 = 4;
14
15 // MSDN says this is incorrect, but MSVC doesn't diagnose it.
16 extern __declspec(selectany) int x5;
17
18 static __declspec(selectany) int x6 = 2; // expected-error{{'selectany' can only be applied to data items with external linkage}}
19
20 // FIXME: MSVC accepts this and makes x7 externally visible and comdat, but keep
21 // it as internal and not weak/linkonce.
22 static int x7; // expected-note{{previous definition}}
23 extern __declspec(selectany) int x7; // expected-warning{{attribute declaration must precede definition}}
24
asdf()25 int asdf() { return x7; }
26
27 class X {
28 public:
X(int i)29 X(int i) { i++; };
30 int i;
31 };
32
33 __declspec(selectany) X x(1);
34
35 namespace { class Internal {}; }
36 __declspec(selectany) auto x8 = Internal(); // expected-error {{'selectany' can only be applied to data items with external linkage}}
37
38
39 // The D3D11 headers do something like this. MSVC doesn't error on this at
40 // all, even without the __declspec(selectany), in violation of the standard.
41 // We fall back to a warning for selectany to accept headers.
42 struct SomeStruct {
43 int foo;
44 };
45 extern const __declspec(selectany) SomeStruct some_struct; // expected-warning {{default initialization of an object of const type 'const SomeStruct' without a user-provided default constructor is a Microsoft extension}}
46
47 // It should be possible to redeclare variables that were defined
48 // __declspec(selectany) previously.
49 extern const SomeStruct some_struct;
50
51 // Without selectany, this should stay an error.
52 const SomeStruct some_struct2; // expected-error {{default initialization of an object of const type 'const SomeStruct' without a user-provided default constructor}}
53