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c37a357c13
This reverts commit443389effc. This reverts commitd94960f22e. Inclusion of header files must be explicit. Every file shall directly include what is necessary. https://github.com/include-what-you-use/include-what-you-use says: > When every file includes what it uses, then it is possible to edit any > file and remove unused headers, without fear of accidentally breaking > the upwards dependencies of that file. It also becomes easy to > automatically track and update dependencies in the source code. Though we don't use iwyu itself, the principle quoted above is a good thing that we can agree. Now that include guards were added to every and all of the headers inside of our project this changeset does not increase compile time, at least on my machine.
79 lines
4 KiB
C++
79 lines
4 KiB
C++
#ifndef RUBY3_HAS_CPP_ATTRIBUTE_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RUBY3_HAS_CPP_ATTRIBUTE_H
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/**
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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(__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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#if ! 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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#endif /* RUBY3_HAS_CPP_ATTRIBUTE_H */
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