From 21429b1488faf58b6683eef2c9c24e00796a32ae Mon Sep 17 00:00:00 2001
From: shyouhei <shyouhei@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 15 Jan 2018 02:35:17 +0000
Subject: __alignof__ to take alignment of a type

C11 and C++11 has this feature so why not use it when available.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61828 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 include/ruby/defines.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'include')

diff --git a/include/ruby/defines.h b/include/ruby/defines.h
index da2ba24109..322df4c6d2 100644
--- a/include/ruby/defines.h
+++ b/include/ruby/defines.h
@@ -380,6 +380,16 @@ void rb_ia64_flushrs(void);
 #define RUBY_ALIGNAS(x) y
 #endif
 
+#ifdef RUBY_ALIGNOF
+/* OK, take that definition */
+#elif defined(__cplusplus) && (__cplusplus >= 201103L)
+#define RUBY_ALIGNOF alignof
+#elif defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L)
+#define RUBY_ALIGNOF _Alignof
+#else
+#define RUBY_ALIGNOF(x) ((size_t)offsetof(struct { char f1; type f2; }, f2))
+#endif
+
 RUBY_SYMBOL_EXPORT_END
 
 #if defined(__cplusplus)
-- 
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