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Edit File : c_attribute.h \| Size : 2.23 KB
#ifndef RBIMPL_HAS_C_ATTRIBUTE_H /--C++--vi:se ft=cpp:/ #define RBIMPL_HAS_C_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_C_ATTRIBUTE. / #include "ruby/internal/has/extension.h" #include "ruby/internal/has/warning.h" /* Wraps (or simulates) `__has_c_attribute`. / #if defined(__cplusplus) # / Makes no sense. / # define RBIMPL_HAS_C_ATTRIBUTE(_) 0 #elif RBIMPL_HAS_EXTENSION(c_attributes) # / Hmm. It seems Clang 17 has this macro defined even when -std=c99 mode, # * _and_ fails to compile complaining that attributes are C2X feature. We # * need to work around this nonsense. / # define RBIMPL_HAS_C_ATTRIBUTE(_) __has_c_attribute(_) #elif RBIMPL_HAS_WARNING("-Wc2x-extensions") # define RBIMPL_HAS_C_ATTRIBUTE(_) 0 #elif defined(__has_c_attribute) # define RBIMPL_HAS_C_ATTRIBUTE(_) __has_c_attribute(_) #else # / As of writing everything that lacks __has_c_attribute also completely # * lacks C2x attributes as well. Might change in future? / # define RBIMPL_HAS_C_ATTRIBUTE(_) 0 #endif #endif / RBIMPL_HAS_C_ATTRIBUTE_H */ Back

Edit File : c_attribute.h | Size : 2.23 KB

#ifndef RBIMPL_HAS_C_ATTRIBUTE_H                     /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_HAS_C_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_C_ATTRIBUTE.
 */

#include "ruby/internal/has/extension.h"
#include "ruby/internal/has/warning.h"

/** Wraps (or simulates) `__has_c_attribute`. */
#if defined(__cplusplus)
# /* Makes no sense. */
# define RBIMPL_HAS_C_ATTRIBUTE(_) 0

#elif RBIMPL_HAS_EXTENSION(c_attributes)
# /* Hmm.  It  seems Clang 17 has  this macro defined even  when -std=c99 mode,
#  * _and_ fails  to compile complaining  that attributes are C2X  feature.  We
#  * need to work around this nonsense. */
# define RBIMPL_HAS_C_ATTRIBUTE(_) __has_c_attribute(_)

#elif RBIMPL_HAS_WARNING("-Wc2x-extensions")
# define RBIMPL_HAS_C_ATTRIBUTE(_) 0

#elif defined(__has_c_attribute)
# define RBIMPL_HAS_C_ATTRIBUTE(_) __has_c_attribute(_)

#else
# /* As  of writing  everything  that lacks  __has_c_attribute also  completely
#  * lacks C2x attributes as well.  Might change in future? */
# define RBIMPL_HAS_C_ATTRIBUTE(_) 0
#endif

#endif /* RBIMPL_HAS_C_ATTRIBUTE_H */

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