https://git.ruby-lang.org/ruby.git/commit/?id=d8be7d463d

From d8be7d463d0c0764a9fcd25bdf1c2a0a4cb215a4 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 2 Jul 2022 22:41:19 +0900
Subject: Suppress -Wstring-concatenation

This concatenation of string literals is to not empty the array
initialization even if no counter is declared, but warned by clang as
suspicious.
---
 debug_counter.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/debug_counter.c b/debug_counter.c
index e7b0bb0acd..cc522283a1 100644
--- a/debug_counter.c
+++ b/debug_counter.c
@@ -17,7 +17,9 @@ https://github.com/ruby/ruby/blob/trunk/debug_counter.c#L17
 #if USE_DEBUG_COUNTER
 
 static const char *const debug_counter_names[] = {
-    ""
+#define DEBUG_COUNTER_NAME_EMPTY "" /* Suppress -Wstring-concatenation */
+    DEBUG_COUNTER_NAME_EMPTY
+#undef DEBUG_COUNTER_NAME_EMPTY
 #define RB_DEBUG_COUNTER(name) #name,
 #include "debug_counter.h"
 #undef RB_DEBUG_COUNTER
-- 
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