From 7ceb16cc5a4b078eebe0e67e82462f16faee9f1f Mon Sep 17 00:00:00 2001
From: Jimmy Hedman <jimmy.hedman@gmail.com>
Date: Tue, 20 Jun 2023 00:34:46 +0200
Subject: [PATCH] Preprocess away unused code when IPv6 is disabled (#4973)

---
 esphome/components/wifi/wifi_component_esp_idf.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/esphome/components/wifi/wifi_component_esp_idf.cpp b/esphome/components/wifi/wifi_component_esp_idf.cpp
index e18d3cc043..744fc755fe 100644
--- a/esphome/components/wifi/wifi_component_esp_idf.cpp
+++ b/esphome/components/wifi/wifi_component_esp_idf.cpp
@@ -58,7 +58,9 @@ struct IDFWiFiEvent {
     wifi_event_ap_probe_req_rx_t ap_probe_req_rx;
     wifi_event_bss_rssi_low_t bss_rssi_low;
     ip_event_got_ip_t ip_got_ip;
+#if LWIP_IPV6
     ip_event_got_ip6_t ip_got_ip6;
+#endif
     ip_event_ap_staipassigned_t ip_ap_staipassigned;
   } data;
 };
@@ -82,8 +84,10 @@ void event_handler(void *arg, esp_event_base_t event_base, int32_t event_id, voi
     memcpy(&event.data.sta_disconnected, event_data, sizeof(wifi_event_sta_disconnected_t));
   } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
     memcpy(&event.data.ip_got_ip, event_data, sizeof(ip_event_got_ip_t));
+#if LWIP_IPV6
   } else if (event_base == IP_EVENT && event_id == IP_EVENT_GOT_IP6) {
     memcpy(&event.data.ip_got_ip6, event_data, sizeof(ip_event_got_ip6_t));
+#endif
   } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_LOST_IP) {  // NOLINT(bugprone-branch-clone)
     // no data
   } else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_SCAN_DONE) {
@@ -504,7 +508,9 @@ const char *get_auth_mode_str(uint8_t mode) {
 }
 
 std::string format_ip4_addr(const esp_ip4_addr_t &ip) { return str_snprintf(IPSTR, 15, IP2STR(&ip)); }
+#if LWIP_IPV6
 std::string format_ip6_addr(const esp_ip6_addr_t &ip) { return str_snprintf(IPV6STR, 39, IPV62STR(ip)); }
+#endif
 const char *get_disconnect_reason_str(uint8_t reason) {
   switch (reason) {
     case WIFI_REASON_AUTH_EXPIRE:
@@ -644,9 +650,11 @@ void WiFiComponent::wifi_process_event_(IDFWiFiEvent *data) {
              format_ip4_addr(it.ip_info.gw).c_str());
     s_sta_got_ip = true;
 
+#if LWIP_IPV6
   } else if (data->event_base == IP_EVENT && data->event_id == IP_EVENT_GOT_IP6) {
     const auto &it = data->data.ip_got_ip6;
     ESP_LOGV(TAG, "Event: Got IPv6 address=%s", format_ip6_addr(it.ip6_info.ip).c_str());
+#endif
 
   } else if (data->event_base == IP_EVENT && data->event_id == IP_EVENT_STA_LOST_IP) {
     ESP_LOGV(TAG, "Event: Lost IP");