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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"
#include "ruby/internal/token_paste.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_TOKEN_PASTE(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_TOKEN_PASTE(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_TOKEN_PASTE(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 */
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