https://git.ruby-lang.org/ruby.git/commit/?id=67d259c5dc

From 67d259c5dccd31fe49d417fec169977712ffdf10 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Wed, 20 May 2020 02:37:58 +0900
Subject: Use __bultin_assume() from clang-7

We observed combination of multiple __builtin_assume() can cause
strange compile results on clang-6 (-DNDEBUG exposed this issue).
To avoid this problem, __builtin_assume() is from clang-7.
https://github.com/ruby/ruby/pull/3120#issuecomment-630821333

diff --git a/include/ruby/assert.h b/include/ruby/assert.h
index ac9b9c8..a79abea 100644
--- a/include/ruby/assert.h
+++ b/include/ruby/assert.h
@@ -90,7 +90,7 @@ RBIMPL_SYMBOL_EXPORT_END() https://github.com/ruby/ruby/blob/trunk/include/ruby/assert.h#L90
 # define RBIMPL_ASSERT_OR_ASSUME(_) RUBY_ASSERT(_)
 #elif defined(RBIMPL_HAVE___ASSUME)
 # define RBIMPL_ASSERT_OR_ASSUME(_) RBIMPL_ASSUME(_)
-#elif RBIMPL_HAS_BUILTIN(__builtin_assume)
+#elif RBIMPL_HAS_BUILTIN(__builtin_assume) && RBIMPL_COMPILER_SINCE(Clang, 7, 0, 0)
 # define RBIMPL_ASSERT_OR_ASSUME(_) RBIMPL_ASSUME(_)
 #else
 # define RBIMPL_ASSERT_OR_ASSUME(_) /* void */
-- 
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