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cpp_attribute.h
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#ifndef RBIMPL_HAS_CPP_ATTRIBUTE_H /*-*-C++-*-vi:se ft=cpp:*/ #define RBIMPL_HAS_CPP_ATTRIBUTE_H /** * @file * @author Ruby developers <ruby-core@ruby-lang.org> * @copyright This file is a part of the programming language Ruby. * Permission is hereby granted, to either redistribute and/or * modify this file, provided that the conditions mentioned in the * file COPYING are met. Consult the file for details. * @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are * implementation details. Don't take them as canon. They could * rapidly appear then vanish. The name (path) of this header file * is also an implementation detail. Do not expect it to persist * at the place it is now. Developers are free to move it anywhere * anytime at will. * @note To ruby-core: remember that this header can be possibly * recursively included from extension libraries written in C++. * Do not expect for instance `__VA_ARGS__` is always available. * We assume C99 for ruby itself but we don't assume languages of * extension libraries. They could be written in C++98. * @brief Defines #RBIMPL_HAS_CPP_ATTRIBUTE. */ #include "ruby/internal/compiler_is.h" #include "ruby/internal/compiler_since.h" /** @cond INTERNAL_MACRO */ #if RBIMPL_COMPILER_IS(SunPro) # /* Oracle Developer Studio 12.5's C++ preprocessor is reportedly broken. We # * could simulate __has_cpp_attribute like below, but don't know the exact # * list of which version supported which attribute. Just kill everything for # * now. If you can please :FIXME: */ # /* https://unicode-org.atlassian.net/browse/ICU-12893 */ # /* https://github.com/boostorg/config/pull/95 */ # define RBIMPL_HAS_CPP_ATTRIBUTE0(_) 0 #elif defined(__has_cpp_attribute) # define RBIMPL_HAS_CPP_ATTRIBUTE0(_) __has_cpp_attribute(_) #elif RBIMPL_COMPILER_IS(MSVC) # /* MSVC has never updated its __cplusplus since forever (unless specified # * explicitly by a compiler flag). They also lack __has_cpp_attribute until # * 2019. However, they do have attributes since 2015 or so. */ # /* https://docs.microsoft.com/en-us/cpp/overview/visual-cpp-language-conformance */ # define RBIMPL_HAS_CPP_ATTRIBUTE0(_) (RBIMPL_HAS_CPP_ATTRIBUTE_ ## _) # define RBIMPL_HAS_CPP_ATTRIBUTE_noreturn 200809 * RBIMPL_COMPILER_SINCE(MSVC, 19, 00, 0) # define RBIMPL_HAS_CPP_ATTRIBUTE_carries_dependency 200809 * RBIMPL_COMPILER_SINCE(MSVC, 19, 00, 0) # define RBIMPL_HAS_CPP_ATTRIBUTE_deprecated 201309 * RBIMPL_COMPILER_SINCE(MSVC, 19, 10, 0) # define RBIMPL_HAS_CPP_ATTRIBUTE_fallthrough 201603 * RBIMPL_COMPILER_SINCE(MSVC, 19, 10, 0) # define RBIMPL_HAS_CPP_ATTRIBUTE_maybe_unused 201603 * RBIMPL_COMPILER_SINCE(MSVC, 19, 11, 0) # define RBIMPL_HAS_CPP_ATTRIBUTE_nodiscard 201603 * RBIMPL_COMPILER_SINCE(MSVC, 19, 11, 0) #elif RBIMPL_COMPILER_BEFORE(Clang, 3, 6, 0) # /* Clang 3.6.0 introduced __has_cpp_attribute. Prior to that following # * attributes were already there. */ # /* https://clang.llvm.org/cxx_status.html */ # define RBIMPL_HAS_CPP_ATTRIBUTE0(_) (RBIMPL_HAS_CPP_ATTRIBUTE_ ## _) # define RBIMPL_HAS_CPP_ATTRIBUTE_noreturn 200809 * RBIMPL_COMPILER_SINCE(Clang, 3, 3, 0) # define RBIMPL_HAS_CPP_ATTRIBUTE_deprecated 201309 * RBIMPL_COMPILER_SINCE(Clang, 3, 4, 0) #elif RBIMPL_COMPILER_BEFORE(GCC, 5, 0, 0) # /* GCC 5+ have __has_cpp_attribute, while 4.x had following attributes. */ # /* https://gcc.gnu.org/projects/cxx-status.html */ # define RBIMPL_HAS_CPP_ATTRIBUTE0(_) (RBIMPL_HAS_CPP_ATTRIBUTE_ ## _) # define RBIMPL_HAS_CPP_ATTRIBUTE_noreturn 200809 * RBIMPL_COMPILER_SINCE(GCC, 4, 8, 0) # define RBIMPL_HAS_CPP_ATTRIBUTE_deprecated 201309 * RBIMPL_COMPILER_SINCE(GCC, 4, 9, 0) #else # /* :FIXME: # * Candidate compilers to list here: # * - icpc: They have __INTEL_CXX11_MODE__. # */ # define RBIMPL_HAS_CPP_ATTRIBUTE0(_) 0 #endif /** @endcond */ /** Wraps (or simulates) `__has_cpp_attribute`. */ #if ! defined(__cplusplus) # /* Makes no sense. */ # define RBIMPL_HAS_CPP_ATTRIBUTE(_) 0 #else # /* GCC needs workarounds. See https://gcc.godbolt.org/z/jdz3pa */ # define RBIMPL_HAS_CPP_ATTRIBUTE(_) \ ((RBIMPL_HAS_CPP_ATTRIBUTE0(_) <= __cplusplus) ? RBIMPL_HAS_CPP_ATTRIBUTE0(_) : 0) #endif #endif /* RBIMPL_HAS_CPP_ATTRIBUTE_H */