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✏️ Editing: c_attribute.h

#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.
 */

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