56 lines · cpp
1// RUN: %clang_cc1 -triple x86_64-win32 -fms-compatibility -fms-extensions -fsyntax-only -verify -std=c++11 %s2// RUN: %clang_cc1 -triple x86_64-unknown-linux -fms-compatibility -fms-extensions -fsyntax-only -verify -std=c++11 %s3// RUN: %clang_cc1 -triple x86_64-win32-macho -fms-compatibility -fms-extensions -fsyntax-only -verify -std=c++11 %s4 5// MSVC produces similar diagnostics.6 7__declspec(selectany) void foo() { } // expected-error{{'selectany' can only be applied to data items with external linkage}}8 9__declspec(selectany) int x1 = 1;10 11const __declspec(selectany) int x2 = 2; // expected-error{{'selectany' can only be applied to data items with external linkage}}12 13extern const __declspec(selectany) int x3 = 3;14 15extern const int x4;16const __declspec(selectany) int x4 = 4;17 18// MSDN says this is incorrect, but MSVC doesn't diagnose it.19extern __declspec(selectany) int x5;20 21static __declspec(selectany) int x6 = 2; // expected-error{{'selectany' can only be applied to data items with external linkage}}22 23// FIXME: MSVC accepts this and makes x7 externally visible and comdat, but keep24// it as internal and not weak/linkonce.25static int x7; // expected-note{{previous definition}}26extern __declspec(selectany) int x7; // expected-warning{{attribute declaration must precede definition}}27 28int asdf() { return x7; }29 30class X {31 public:32 X(int i) { i++; };33 int i;34};35 36__declspec(selectany) X x(1);37 38namespace { class Internal {}; }39__declspec(selectany) auto x8 = Internal(); // expected-error {{'selectany' can only be applied to data items with external linkage}}40 41 42// The D3D11 headers do something like this. MSVC doesn't error on this at43// all, even without the __declspec(selectany), in violation of the standard.44// We fall back to a warning for selectany to accept headers.45struct SomeStruct {46 int foo;47};48extern 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}}49 50// It should be possible to redeclare variables that were defined51// __declspec(selectany) previously.52extern const SomeStruct some_struct;53 54// Without selectany, this should stay an error.55const SomeStruct some_struct2; // expected-error {{default initialization of an object of const type 'const SomeStruct' without a user-provided default constructor}}56