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82 lines
4.1 KiB
C++
82 lines
4.1 KiB
C++
/** \noop-*-C++-*-vi:ft=cpp
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* @file
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* @author Ruby developers <ruby-core@ruby-lang.org>
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* @copyright This file is a part of the programming language Ruby.
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* Permission is hereby granted, to either redistribute and/or
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* modify this file, provided that the conditions mentioned in the
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* file COPYING are met. Consult the file for details.
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* @warning Symbols prefixed with either `RUBY3` or `ruby3` are
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* implementation details. Don't take them as canon. They could
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* rapidly appear then vanish. The name (path) of this header file
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* is also an implementation detail. Do not expect it to persist
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* at the place it is now. Developers are free to move it anywhere
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* anytime at will.
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* @note To ruby-core: remember that this header can be possibly
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* recursively included from extension libraries written in C++.
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* Do not expect for instance `__VA_ARGS__` is always available.
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* We assume C99 for ruby itself but we don't assume languages of
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* extension libraries. They could be written in C++98.
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* @brief Defines #RUBY3_HAS_CPP_ATTRIBUTE.
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*/
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#include "ruby/3/compiler_is.h"
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#include "ruby/3/compiler_since.h"
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#include "ruby/3/token_paste.h"
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/** @cond INTERNAL_MACRO */
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#if defined(RUBY3_HAS_CPP_ATTRIBUTE0)
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# /* Take that. */
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#elif defined(__has_cpp_attribute)
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# define RUBY3_HAS_CPP_ATTRIBUTE0(_) __has_cpp_attribute(_)
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#elif RUBY3_COMPILER_IS(MSVC)
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# /* MSVC has never updated its __cplusplus since forever (unless specified
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# * explicitly by a compiler flag). They also lack __has_cpp_attribute until
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# * 2019. However, they do have attributes since 2015 or so. */
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# /* https://docs.microsoft.com/en-us/cpp/overview/visual-cpp-language-conformance */
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# define RUBY3_HAS_CPP_ATTRIBUTE0(_) RUBY3_TOKEN_PASTE(RUBY3_HAS_CPP_ATTRIBUTE_, _)
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# define RUBY3_HAS_CPP_ATTRIBUTE_noreturn 200809 * RUBY3_COMPILER_SINCE(MSVC, 19, 00, 0)
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# define RUBY3_HAS_CPP_ATTRIBUTE_carries_dependency 200809 * RUBY3_COMPILER_SINCE(MSVC, 19, 00, 0)
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# define RUBY3_HAS_CPP_ATTRIBUTE_deprecated 201309 * RUBY3_COMPILER_SINCE(MSVC, 19, 10, 0)
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# define RUBY3_HAS_CPP_ATTRIBUTE_fallthrough 201603 * RUBY3_COMPILER_SINCE(MSVC, 19, 10, 0)
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# define RUBY3_HAS_CPP_ATTRIBUTE_maybe_unused 201603 * RUBY3_COMPILER_SINCE(MSVC, 19, 11, 0)
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# define RUBY3_HAS_CPP_ATTRIBUTE_nodiscard 201603 * RUBY3_COMPILER_SINCE(MSVC, 19, 11, 0)
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#elif RUBY3_COMPILER_BEFORE(Clang, 3, 6, 0)
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# /* Clang 3.6.0 introduced __has_cpp_attribute. Prior to that following
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# * attributes were already there. */
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# /* https://clang.llvm.org/cxx_status.html */
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# define RUBY3_HAS_CPP_ATTRIBUTE0(_) RUBY3_TOKEN_PASTE(RUBY3_HAS_CPP_ATTRIBUTE_, _)
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# define RUBY3_HAS_CPP_ATTRIBUTE_noreturn 200809 * RUBY3_COMPILER_SINCE(Clang, 3, 3, 0)
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# define RUBY3_HAS_CPP_ATTRIBUTE_deprecated 201309 * RUBY3_COMPILER_SINCE(Clang, 3, 4, 0)
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#elif RUBY3_COMPILER_BEFORE(GCC, 5, 0, 0)
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# /* GCC 5+ have __has_cpp_attribute, while 4.x had following attributes. */
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# /* https://gcc.gnu.org/projects/cxx-status.html */
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# define RUBY3_HAS_CPP_ATTRIBUTE0(_) RUBY3_TOKEN_PASTE(RUBY3_HAS_CPP_ATTRIBUTE_, _)
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# define RUBY3_HAS_CPP_ATTRIBUTE_noreturn 200809 * RUBY3_COMPILER_SINCE(GCC, 4, 8, 0)
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# define RUBY3_HAS_CPP_ATTRIBUTE_deprecated 201309 * RUBY3_COMPILER_SINCE(GCC, 4, 9, 0)
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#else
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# /* :FIXME:
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# * Candidate compilers to list here:
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# * - icpc: They have __INTEL_CXX11_MODE__.
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# * - SunPro: Seems they support C++11.
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# */
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# define RUBY3_HAS_CPP_ATTRIBUTE0(_) 0
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#endif
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/** @endcond */
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/** Wraps (or simulates) `__has_cpp_attribute`. */
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#ifdef RUBY3_HAS_CPP_ATTRIBUTE
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# /* Take that. */
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#elif ! defined(__cplusplus)
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# /* Makes no sense. */
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# define RUBY3_HAS_CPP_ATTRIBUTE(_) 0
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#else
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# /* GCC needs workarounds. See https://gcc.godbolt.org/z/jdz3pa */
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# define RUBY3_HAS_CPP_ATTRIBUTE(_) \
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((RUBY3_HAS_CPP_ATTRIBUTE0(_) <= __cplusplus) ? RUBY3_HAS_CPP_ATTRIBUTE0(_) : 0)
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#endif
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