b144d36693
selectany only applies to externally visible global variables. It has the effect of making the data weak_odr. The MSDN docs suggest that unused definitions can only be dropped at linktime, so Clang uses weak instead of linkonce. MSVC optimizes away references to constant selectany data, so it must assume that there is only one definition, hence weak_odr. Reviewers: espindola Differential Revision: http://llvm-reviews.chandlerc.com/D814 llvm-svn: 182266
34 lines
1.1 KiB
C++
34 lines
1.1 KiB
C++
// RUN: %clang_cc1 -fms-extensions -fsyntax-only -verify %s
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// MSVC produces similar diagnostics.
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__declspec(selectany) void foo() { } // expected-error{{'selectany' can only be applied to data items with external linkage}}
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__declspec(selectany) int x1 = 1;
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const __declspec(selectany) int x2 = 2; // expected-error{{'selectany' can only be applied to data items with external linkage}}
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extern const __declspec(selectany) int x3 = 3;
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extern const int x4;
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const __declspec(selectany) int x4 = 4;
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// MSDN says this is incorrect, but MSVC doesn't diagnose it.
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extern __declspec(selectany) int x5;
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static __declspec(selectany) int x6 = 2; // expected-error{{'selectany' can only be applied to data items with external linkage}}
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// FIXME: MSVC accepts this and makes x7 externally visible and comdat, but keep
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// it as internal and not weak/linkonce.
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static int x7; // expected-note{{previous definition}}
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extern __declspec(selectany) int x7; // expected-warning{{attribute declaration must precede definition}}
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int asdf() { return x7; }
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class X {
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public:
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X(int i) { i++; };
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int i;
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};
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__declspec(selectany) X x(1);
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