restrict.h

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#ifndef RBIMPL_ATTR_RESTRICT_H                       /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_ATTR_RESTRICT_H
#include "ruby/internal/compiler_since.h"
#include "ruby/internal/has/attribute.h"
 
/* :FIXME:  config.h  includes conflicting  `#define  restrict`.   MSVC can  be
 * detected  using `RBIMPL_COMPILER_SINCE()`,  but  Clang &  family cannot  use
 * `__has_declspec_attribute()` which involves macro substitution. */
 
#if RBIMPL_COMPILER_SINCE(MSVC, 14, 0, 0)
# define RBIMPL_ATTR_RESTRICT() __declspec(re ## strict)
 
#elif RBIMPL_HAS_ATTRIBUTE(malloc)
# define RBIMPL_ATTR_RESTRICT() __attribute__((__malloc__))
 
#elif RBIMPL_COMPILER_SINCE(SunPro, 5, 10, 0)
# define RBIMPL_ATTR_RESTRICT() _Pragma("returns_new_memory")
 
#else
# define RBIMPL_ATTR_RESTRICT() /* void */
#endif
 
#endif /* RBIMPL_ATTR_RESTRICT_H */