revert r39861

* include/ruby/ruby.h: revert r39861 because RB_UNUSED_VAR() is used
  for array variables in extension libraries.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39864 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 1 deletions

diff --git a/vm_core.h b/vm_core.h
index c942c6e3e6..576ba8e0d9 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -115,7 +115,13 @@
 #define UNLIKELY(x) (x)
 #endif /* __GNUC__ >= 3 */
 
-#define UNINITIALIZED_VAR(x) RB_UNUSED_VAR(x)
+#if (defined(__clang__) && (__clang_major__ == 4 && __clang_minor__ == 2))
+#define UNINITIALIZED_VAR(x) x __attribute__((unused))
+#elif defined(__GNUC__) && __GNUC__ >= 3
+#define UNINITIALIZED_VAR(x) x = x
+#else
+#define UNINITIALIZED_VAR(x) x
+#endif
 
 typedef unsigned long rb_num_t;