ruby.h: align

* include/ruby/ruby.h (RBasic): to be aligned on a VALUE size
  boundary.  [Bug #7647]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38741 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Wed Jan  9 02:13:22 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* include/ruby/ruby.h (RBasic): to be aligned on a VALUE size
+	  boundary.  [Bug #7647]
+
 Tue Jan  8 14:41:41 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* vm_core.h (rb_iseq_t): move flip_cnt from struct iseq_compile_data,

include/ruby/ruby.h

@@ -699,7 +699,11 @@ VALUE rb_newobj_of(VALUE, VALUE);
 struct RBasic {
     VALUE flags;
     VALUE klass;
-};
+}
+#ifdef __GNUC__
+    __attribute__((aligned(sizeof(VALUE))))
+#endif
+;
 
 #define ROBJECT_EMBED_LEN_MAX 3
 struct RObject {