| 1 | // RUN: %clang_cc1 -fsyntax-only -verify %s |
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| 2 | |
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| 3 | // C++ [basic.def.odr]p1: |
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| 4 | // No translation unit shall contain more than one definition of any |
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| 5 | // variable, [...]. |
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| 6 | |
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| 7 | // Bad: in C++, these are both definitions. None of that C99 tentative stuff. |
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| 8 | int i; // expected-note {{previous}} |
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| 9 | int i; // expected-error {{redefinition}} |
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| 10 | |
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| 11 | // OK: decl + def |
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| 12 | extern int j; |
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| 13 | int j; |
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| 14 | |
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| 15 | // OK: def + decl |
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| 16 | int k; |
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| 17 | extern int k; |
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| 18 | |
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| 19 | // Bad. The important thing here is that we don't emit the diagnostic twice. |
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| 20 | int l = 1; // expected-note {{previous}} |
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| 21 | int l = 2; // expected-error {{redefinition}} |
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| 22 | |
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