https://git.ruby-lang.org/ruby.git/commit/?id=d76be10df1

From d76be10df11cf24d7a5a1f88a4aadc6d817db4a7 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Mon, 19 Aug 2019 14:43:15 +0900
Subject: missing/memcmp.c: suppress a `-Wparentheses` warning


diff --git a/missing/memcmp.c b/missing/memcmp.c
index a81eec4..9657e6c 100644
--- a/missing/memcmp.c
+++ b/missing/memcmp.c
@@ -11,7 +11,8 @@ memcmp(const void *s1, const void *s2, size_t len) https://github.com/ruby/ruby/blob/trunk/missing/memcmp.c#L11
     register int tmp;
 
     for (; len; --len) {
-	if (tmp = *a++ - *b++)
+	tmp = *a++ - *b++;
+	if (tmp)
 	    return tmp;
     }
     return 0;
-- 
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