From 76fd104fb6d41cfbde810aa9433c49ee9c84665f Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Thu, 7 Aug 2025 14:32:35 -1000
Subject: [PATCH] [mdns] Conditionally compile extra services to reduce flash
 usage (#10129)

---
 esphome/components/mdns/__init__.py        | 3 +++
 esphome/components/mdns/mdns_component.cpp | 2 ++
 esphome/components/mdns/mdns_component.h   | 4 ++++
 3 files changed, 9 insertions(+)

diff --git a/esphome/components/mdns/__init__.py b/esphome/components/mdns/__init__.py
index e32d39cede..469fe8ada6 100644
--- a/esphome/components/mdns/__init__.py
+++ b/esphome/components/mdns/__init__.py
@@ -93,6 +93,9 @@ async def to_code(config):
     var = cg.new_Pvariable(config[CONF_ID])
     await cg.register_component(var, config)
 
+    if config[CONF_SERVICES]:
+        cg.add_define("USE_MDNS_EXTRA_SERVICES")
+
     for service in config[CONF_SERVICES]:
         txt = [
             cg.StructInitializer(
diff --git a/esphome/components/mdns/mdns_component.cpp b/esphome/components/mdns/mdns_component.cpp
index 06ca99b402..640750720d 100644
--- a/esphome/components/mdns/mdns_component.cpp
+++ b/esphome/components/mdns/mdns_component.cpp
@@ -104,7 +104,9 @@ void MDNSComponent::compile_records_() {
   }
 #endif
 
+#ifdef USE_MDNS_EXTRA_SERVICES
   this->services_.insert(this->services_.end(), this->services_extra_.begin(), this->services_extra_.end());
+#endif
 
   if (this->services_.empty()) {
     // Publish "http" service if not using native API
diff --git a/esphome/components/mdns/mdns_component.h b/esphome/components/mdns/mdns_component.h
index 93a16f40d2..f87ef08bcd 100644
--- a/esphome/components/mdns/mdns_component.h
+++ b/esphome/components/mdns/mdns_component.h
@@ -35,14 +35,18 @@ class MDNSComponent : public Component {
 #endif
   float get_setup_priority() const override { return setup_priority::AFTER_CONNECTION; }
 
+#ifdef USE_MDNS_EXTRA_SERVICES
   void add_extra_service(MDNSService service) { services_extra_.push_back(std::move(service)); }
+#endif
 
   std::vector<MDNSService> get_services();
 
   void on_shutdown() override;
 
  protected:
+#ifdef USE_MDNS_EXTRA_SERVICES
   std::vector<MDNSService> services_extra_{};
+#endif
   std::vector<MDNSService> services_{};
   std::string hostname_;
   void compile_records_();