more support for NORETURN

Before this NORETURN was checked only for __attribute__ or __declspec,
but nowadays other ways are there to tell compilers that a function
never returns.  Take them into account.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61831 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

include/ruby/defines.h

@@ -29,10 +29,6 @@ extern "C" {
 #ifndef PUREFUNC
 # define PUREFUNC(x) x
 #endif
-#define NORETURN_STYLE_NEW 1
-#ifndef NORETURN
-# define NORETURN(x) x
-#endif
 #ifndef DEPRECATED
 # define DEPRECATED(x) x
 #endif
@@ -390,6 +386,17 @@ void rb_ia64_flushrs(void);
 #define RUBY_ALIGNOF(x) ((size_t)offsetof(struct { char f1; type f2; }, f2))
 #endif
 
+#define NORETURN_STYLE_NEW 1
+#ifdef NORETURN
+/* OK, take that definition */
+#elif defined(__cplusplus) && (__cplusplus >= 201103L)
+#define NORETURN(x) [[ noreturn ]] x
+#elif defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L)
+#define NORETURN(x) _Noreturn x
+#else
+#define NORETURN(x) x
+#endif
+
 RUBY_SYMBOL_EXPORT_END
 
 #if defined(__cplusplus)