From 3dfd86062b9edf30f48701413ade565d67d3c1bb Mon Sep 17 00:00:00 2001
From: Amaury Denoyelle <adenoyelle@haproxy.com>
Date: Thu, 11 Jun 2026 11:47:57 +0200
Subject: [PATCH] BUILD: h3: fix compilation with USE_TRACE=0

Mark argument in h3_trace_header as unused if USE_TRACE is not set.

No need to backport unless HTTP/3 header traces are picked.
---
 src/h3.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/h3.c b/src/h3.c
index 7b469df45..071206b7a 100644
--- a/src/h3.c
+++ b/src/h3.c
@@ -639,7 +639,8 @@ static void _h3_trace_header(const struct ist n, const struct ist v,
                              const struct qcc *qcc, const struct qcs *qcs)
 {
 	struct ist n_short, v_short;
-	const char *c_str, *s_str;
+	const char *c_str __maybe_unused;
+	const char *s_str __maybe_unused;
 
 	chunk_reset(&trash);
 	c_str = chunk_newstr(&trash);