c_attribute.h

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#ifndef RBIMPL_HAS_C_ATTRIBUTE_H                     /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_HAS_C_ATTRIBUTE_H
#include "ruby/internal/has/extension.h"
#include "ruby/internal/has/warning.h"
 
#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 */