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wg21.link/P2552 suggest that __has_cpp_attribute should return a non-zero value for all attributes that the implementation does something interesting with. Clang does something meaninful with all attributes except for: - no_unique_address which we do not support for msvc target - carries_dependency which arguably does nothing interesting. P2552 shies away from specifying a behavior for that attribute (despite being the only one for which a recommandation would have been interesting, arguably) As such, we have nothing to change for this paper. This paper is a DR and clang always behaved reasonably.
21 lines
952 B
C++
21 lines
952 B
C++
// RUN: %clang_cc1 %s -x c++ -std=c++11 -triple x86_64-pc-linux -fsyntax-only -verify -Wno-c++17-extensions
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// RUN: %clang_cc1 %s -x c++ -std=c++11 -triple x86_64-windows-msvc -fsyntax-only -verify=msvc -Wno-c++17-extensions
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// expected-no-diagnostics
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// Check we return non-zero values for supported attributes as per
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// wg21.link/P2552
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static_assert(__has_cpp_attribute(assume));
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// The standard does not prescribe a behavior for [[carries_dependency]]
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static_assert(__has_cpp_attribute(deprecated));
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static_assert(__has_cpp_attribute(fallthrough));
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static_assert(__has_cpp_attribute(likely));
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static_assert(__has_cpp_attribute(unlikely));
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static_assert(__has_cpp_attribute(maybe_unused));
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static_assert(__has_cpp_attribute(nodiscard));
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static_assert(__has_cpp_attribute(noreturn));
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// We do not support [[no_unique_address]] in MSVC emulation mode
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static_assert(__has_cpp_attribute(no_unique_address)); // msvc-error {{static assertion failed}}
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