From 9c86553e36a73fdb034666df216ab13d2e60b0d2 Mon Sep 17 00:00:00 2001
From: Guo Ruijing <ruijing.guo@intel.com>
Date: Wed, 16 Sep 2020 16:24:51 +0800
Subject: [PATCH] fix envoy build failed with unused variable factory_name

Signed-off-by: Guo Ruijing <ruijing.guo@intel.com>
---
 include/envoy/registry/registry.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/envoy/registry/registry.h b/include/envoy/registry/registry.h
index b52686036074..37583c8accae 100644
--- a/include/envoy/registry/registry.h
+++ b/include/envoy/registry/registry.h
@@ -345,7 +345,7 @@ template <class Base> class FactoryRegistry : public Logger::Loggable<Logger::Id
   static std::unique_ptr<absl::flat_hash_map<std::string, Base*>> buildFactoriesByType() {
     auto mapping = std::make_unique<absl::flat_hash_map<std::string, Base*>>();
 
-    for (const auto& [factory_name, factory] : factories()) {
+    for (const auto& [[[maybe_unused]]factory_name, factory] : factories()) {
       if (factory == nullptr) {
         continue;
       }