41 lines
1.3 KiB
C++
41 lines
1.3 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -Wunused -Wused-but-marked-unused -std=c++17 -Wc++17-extensions -verify %s
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// RUN: %clang_cc1 -fsyntax-only -Wunused -Wused-but-marked-unused -std=c++11 -Wc++17-extensions -verify -DEXT %s
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static_assert(__has_cpp_attribute(maybe_unused) == 201603, "");
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struct [[maybe_unused]] S {};
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enum E1 {
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EnumVal [[maybe_unused]],
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UsedEnumVal,
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};
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void f() {
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int x; // expected-warning {{unused variable}}
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typedef int I; // expected-warning {{unused typedef 'I'}}
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E1 e;
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switch (e) { // expected-warning {{enumeration value 'UsedEnumVal' not handled in switch}}
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}
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// Should not warn about these due to not being used.
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[[maybe_unused]] int y;
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typedef int maybe_unused_int [[maybe_unused]];
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// Should not warn about these uses.
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S s;
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maybe_unused_int test;
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y = 12;
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switch (e) {
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case UsedEnumVal:
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break;
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}
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}
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#ifdef EXT
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// expected-warning@6 {{use of the 'maybe_unused' attribute is a C++17 extension}}
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// expected-warning@9 {{use of the 'maybe_unused' attribute is a C++17 extension}}
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// expected-warning@9 {{attributes on an enumerator declaration are a C++17 extension}}
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// expected-warning@21 {{use of the 'maybe_unused' attribute is a C++17 extension}}
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// expected-warning@22 {{use of the 'maybe_unused' attribute is a C++17 extension}}
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#endif
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