319 lines
9.0 KiB
C++
319 lines
9.0 KiB
C++
#ifndef HU_FEATURES_H
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#define HU_FEATURES_H
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/* clang-format off */
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/**
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* \def hu_has_builtin(x)
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* Check if the builtin x is provided by the compiler.
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*
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* Example: __has_builtin(__builtin_mul_overflow)
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*
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* Supported by:
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* - Clang since at least 3.0
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*
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* Links:
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* - [Clang documentation](https://clang.llvm.org/docs/LanguageExtensions.html#has-builtin)
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*/
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/* clang-format on */
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#ifndef __has_builtin
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# define HU_HAVE_has_builtin_P 0
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# define hu_has_builtin(x) 0
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#else
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# define HU_HAVE_has_builtin_P 1
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# define HU_HAVE_has_builtin 1
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# define hu_has_builtin __has_builtin
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#endif
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/* clang-format off */
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/**
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* \def hu_has_feature(x)
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* Check if the standardised language feature x is available.
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*
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* Examples:
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* - hu_has_feature(cxx_variable_templates)
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* - hu_has_feature(c_alignas)
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* - hu_has_feature(cxx_rtti)
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*
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* Supported by:
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* - Clang since at least 3.0
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*
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* Links:
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* - [Clang documentation](https://clang.llvm.org/docs/LanguageExtensions.html#has-feature-and-has-extension)
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*/
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/* clang-format on */
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#ifndef __has_feature
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# define HU_HAVE_has_feature_P 0
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# define hu_has_feature(x) 0
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#else
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# define HU_HAVE_has_feature_P 1
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# define HU_HAVE_has_feature 1
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# define hu_has_feature __has_feature
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#endif
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/* clang-format off */
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/**
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* \def hu_has_extension(x)
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* Check if the language feature/extension x is available.
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* Examples:
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* - hu_has_extension(cxx_variable_templates)
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* - hu_has_extension(c_alignas)
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* - hu_has_extension(cxx_rtti)
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*
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* Supported by:
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* - Clang since at least 3.0
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*
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* Links:
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* - [Clang documentation](https://clang.llvm.org/docs/LanguageExtensions.html#has-feature-and-has-extension)
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*/
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/* clang-format on */
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#ifndef __has_extension
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# define HU_HAVE_has_extension_P 0
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# define hu_has_extension hu_has_feature
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#else
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# define HU_HAVE_has_extension_P 1
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# define HU_HAVE_has_extension 1
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# define hu_has_extension __has_extension
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#endif
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/* clang-format off */
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/**
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* \def hu_has_cpp_attribute(x)
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* Check if the C++ attribute [[x]] is supported. Standardised in C++20.
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*
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* Supported by:
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* - Clang since 3.6
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* - GCC since 5.1
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* - MSVC since 1920 / VS2019 v16.0.1
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*
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* Links:
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* - [C++20 Paper P0941](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0941r2.html#recs.hasattr)
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* - [cppreference overview](https://en.cppreference.com/w/User:D41D8CD98F/feature_testing_macros)
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* - [Clang documentation](https://clang.llvm.org/docs/LanguageExtensions.html#has-cpp-attribute)
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* - [GCC documentation](https://gcc.gnu.org/onlinedocs/cpp/_005f_005fhas_005fcpp_005fattribute.html#g_t_005f_005fhas_005fcpp_005fattribute)
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* - [MSVC announcement](https://docs.microsoft.com/en-us/cpp/overview/what-s-new-for-visual-cpp-in-visual-studio?view=vs-2019)
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*/
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/* clang-format on */
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#ifndef __has_cpp_attribute
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# define HU_HAVE_has_cpp_attribute_P 0
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# define hu_has_cpp_attribute(x) 0
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#else
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# define HU_HAVE_has_cpp_attribute_P 1
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# define HU_HAVE_has_cpp_attribute 1
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# define hu_has_cpp_attribute __has_cpp_attribute
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#endif
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/* clang-format off */
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/**
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* \def hu_has_c_attribute(x)
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*
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* From the Clang release notes: Detect whether a double square-bracket
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* attribute is supported in C mode. This attribute syntax can be enabled with
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* the -fdouble-square-bracket-attributes flag.
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*
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* Supported by:
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* - Clang since 6.0 in C mode, use the -fdouble-square-bracket-attributes flag.
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*
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* Links:
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* - [Clang documentation](https://clang.llvm.org/docs/LanguageExtensions.html#has-c-attribute)
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*/
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/* clang-format on */
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#ifndef __has_c_attribute
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# define HU_HAVE_has_c_attribute_P 0
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# define hu_has_c_attribute(x) 0
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#else
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# define HU_HAVE_has_c_attribute_P 1
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# define HU_HAVE_has_c_attribute 1
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# define hu_has_c_attribute __has_c_attribute
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#endif
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/* clang-format off */
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/**
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* \def hu_has_attribute(x)
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*
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* Check if a the gnu style attribute x is supported.
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*
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* Examples:
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* - hu_has_attribute(returns_nonnull)
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* - hu_has_attribute(__noreturn__)
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*
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* Supported by:
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* - Clang since at least 3.0, fixed in 3.5 to be target aware.
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* - GCC since 5.1
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*
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* Links:
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* - [Clang documentation](https://clang.llvm.org/docs/LanguageExtensions.html#has-include-next)
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* - [GCC documentation](https://gcc.gnu.org/onlinedocs/cpp/_005f_005fhas_005fattribute.html)
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*/
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/* clang-format on */
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#ifndef __has_attribute
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# define HU_HAVE_has_attribute_P 0
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# define hu_has_attribute(x) 0
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#else
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# define HU_HAVE_has_attribute_P 1
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# define HU_HAVE_has_attribute 1
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# define hu_has_attribute __has_attribute
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#endif
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/* clang-format off */
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/**
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* \def hu_has_declspec_attribute(x)
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*
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* Check if a the MSVC style __declspec attribute x is supported.
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*
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* Examples:
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* - hu_has_declspec_attribute(restrict)
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* - hu_has_attribute(__dllexport__)
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*
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* Supported by:
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* - Clang since 3.6
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*
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* Links:
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* - [Clang documentation](https://clang.llvm.org/docs/LanguageExtensions.html#has-declspec-attribute)
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*/
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/* clang-format on */
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#ifndef __has_declspec_attribute
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# define HU_HAVE_has_declspec_attribute_P 0
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# define hu_has_declspec_attribute(x) 0
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#else
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# define HU_HAVE_has_declspec_attribute_P 1
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# define HU_HAVE_has_declspec_attribute 1
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# define hu_has_declspec_attribute __has_declspec_attribute
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#endif
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/* clang-format off */
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/**
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* \def hu_is_identifier(x)
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*
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* From the Clang documentation: This function-like macro takes a single
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* identifier argument that might be either a reserved word or a regular
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* identifier. It evaluates to 1 if the argument is just a regular identifier
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* and not a reserved word, in the sense that it can then be used as the name of
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* a user-defined function or variable. Otherwise it evaluates to 0.
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*
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* Examples:
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* - hu_is_identifier(_Alignas)
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* - hu_is_identifier(__nullptr)
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*
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* Supported by:
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* - Clang since 3.5
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*
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* Links:
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* - [Clang documentation](https://clang.llvm.org/docs/LanguageExtensions.html#is-identifier)
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*/
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/* clang-format on */
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#ifndef __is_identifier
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# define HU_HAVE_has_is_identifier_P 0
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# define hu_is_identifier(x) 0
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#else
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# define HU_HAVE_has_is_identifier_P 1
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# define HU_HAVE_has_is_identifier 1
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# define hu_is_identifier __is_identifier
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#endif
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/* clang-format off */
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/**
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* \def hu_has_include(x)
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*
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* From the Clang documentation: This function-like macro takes a single file
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* name string argument that is the name of an include file. It evaluates to 1
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* if the file can be found using the include paths, or 0 otherwise.
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*
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* Examples:
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* - hu_has_include(<filesystem>)
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* - hu_has_include("hu/features.h")
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*
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* Supported by:
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* - Clang since at least 3.0
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* - GCC since 5.1
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* - MSVC since 1911 / VS2017 Update 3 v15.3.3
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*
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* Links:
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* - [Clang documentation](https://clang.llvm.org/docs/LanguageExtensions.html#has-include)
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* - [GCC documentation](https://gcc.gnu.org/onlinedocs/cpp/_005f_005fhas_005finclude.html#g_t_005f_005fhas_005finclude)
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* - [MSVC documentation](https://docs.microsoft.com/en-us/cpp/preprocessor/hash-if-hash-elif-hash-else-and-hash-endif-directives-c-cpp?view=vs-2019#__has_include)
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*/
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/* clang-format on */
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#if defined(__GNUC__) && __GNUC__ == 4 && __GNUC_MINOR__ == 9
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/* GCC 4.9.x is buggy */
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# undef __has_include
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# undef __has_include_next
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#endif
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#ifndef __has_include
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# define HU_HAVE_has_include_P 0
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# define hu_has_include(x) 0
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# define hu_maybe_has_include(x) 1
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#else
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# define HU_HAVE_has_include_P 1
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# define HU_HAVE_has_include 1
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# define hu_has_include __has_include
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# define hu_maybe_has_include __has_include
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#endif
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/* clang-format off */
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/**
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* \def hu_has_include_next(x)
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*
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* From the Clang documentation: This function-like macro takes a single file
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* name string argument that is the name of an include file. It is like
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* __has_include except that it looks for the second instance of the given file
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* found in the include paths. It evaluates to 1 if the second instance of the
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* file can be found using the include paths, or 0 otherwise.
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*
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* Examples:
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* - hu_has_include_next(<filesystem>)
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* - hu_has_include_next("hu/features.h")
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*
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* Supported by:
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* - Clang since at least 3.0
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* - GCC since 5.1
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*
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* Links:
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* - [Clang documentation](https://clang.llvm.org/docs/LanguageExtensions.html#has-include-next)
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* - [GCC 5 release announcement](https://gcc.gnu.org/gcc-5/changes.html)
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*/
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/* clang-format on */
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#ifndef __has_include_next
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# define HU_HAVE_has_include_next_P 0
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# define hu_has_include_next(x) 0
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#else
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# define HU_HAVE_has_include_next_P 1
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# define HU_HAVE_has_include_next 1
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# define hu_has_include_next __has_include_next
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#endif
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/* clang-format off */
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/**
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* \def hu_has_warning(x)
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*
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* Check if the compiler understands the warning flag x. It does not check
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* wether the warning is enabled or not.
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*
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* Examples:
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* - hu_has_warning("-Wimplicit-fallthrough")
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* - hu_has_warning("-Wconversion")
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*
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* Supported by:
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* - Clang since at least 3.0
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*
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* Links:
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* - [Clang documentation](https://clang.llvm.org/docs/LanguageExtensions.html#has-warning)
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*/
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/* clang-format on */
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#ifndef __has_warning
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# define HU_HAVE_has_warning_P 0
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# define hu_has_warning(x) 0
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#else
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# define HU_HAVE_has_warning_P 1
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# define HU_HAVE_has_warning 1
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# define hu_has_warning __has_warning
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#endif
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#endif
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