| 1 | // RUN: %clang_cc1 -fsyntax-only -Wheader-hygiene -verify %s |
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| 2 | |
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| 3 | #ifdef BE_THE_HEADER |
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| 4 | namespace warn_in_header_in_global_context {} |
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| 5 | using namespace warn_in_header_in_global_context; // expected-warning {{using namespace directive in global context in header}} |
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| 6 | |
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| 7 | // While we want to error on the previous using directive, we don't when we are |
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| 8 | // inside a namespace |
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| 9 | namespace dont_warn_here { |
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| 10 | using namespace warn_in_header_in_global_context; |
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| 11 | } |
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| 12 | |
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| 13 | // We should warn in toplevel extern contexts. |
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| 14 | namespace warn_inside_linkage {} |
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| 15 | extern "C++" { |
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| 16 | using namespace warn_inside_linkage; // expected-warning {{using namespace directive in global context in header}} |
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| 17 | } |
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| 18 | |
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| 19 | // This is really silly, but we should warn on it: |
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| 20 | extern "C++" { |
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| 21 | extern "C" { |
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| 22 | extern "C++" { |
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| 23 | using namespace warn_inside_linkage; // expected-warning {{using namespace directive in global context in header}} |
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| 24 | } |
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| 25 | } |
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| 26 | } |
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| 27 | |
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| 28 | // But we shouldn't warn in extern contexts inside namespaces. |
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| 29 | namespace dont_warn_here { |
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| 30 | extern "C++" { |
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| 31 | using namespace warn_in_header_in_global_context; |
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| 32 | } |
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| 33 | } |
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| 34 | |
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| 35 | // We also shouldn't warn in case of functions. |
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| 36 | inline void foo() { |
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| 37 | using namespace warn_in_header_in_global_context; |
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| 38 | } |
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| 39 | |
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| 40 | |
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| 41 | namespace macronamespace {} |
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| 42 | #define USING_MACRO using namespace macronamespace; |
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| 43 | |
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| 44 | // |using namespace| through a macro should warn if the instantiation is in a |
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| 45 | // header. |
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| 46 | USING_MACRO // expected-warning {{using namespace directive in global context in header}} |
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| 47 | |
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| 48 | #else |
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| 49 | |
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| 50 | #define BE_THE_HEADER |
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| 51 | #include __FILE__ |
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| 52 | |
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| 53 | namespace dont_warn {} |
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| 54 | using namespace dont_warn; |
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| 55 | |
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| 56 | // |using namespace| through a macro shouldn't warn if the instantiation is in a |
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| 57 | // cc file. |
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| 58 | USING_MACRO |
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| 59 | |
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| 60 | // Check behavior of line markers. |
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| 61 | namespace warn_header_with_line_marker {} |
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| 62 | # 1 "XXX.h" 1 |
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| 63 | using namespace warn_header_with_line_marker; // expected-warning {{using namespace directive in global context in header}} |
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| 64 | # 70 "warn-using-namespace-in-header.cpp" 2 |
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| 65 | |
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| 66 | namespace nowarn_after_line_marker {} |
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| 67 | using namespace nowarn_after_line_marker; |
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| 68 | |
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| 69 | #endif |
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| 70 | |
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