From 7451fe4766be12776013fa11fcbc99547aac00a4 Mon Sep 17 00:00:00 2001
From: Guilherme Ferreira <guilherme.ferreira@espressif.com>
Date: Mon, 16 Mar 2026 19:09:38 -0300
Subject: [PATCH] ci(esp_eth): add C++ regression guard for ethernet macros

---
 .../esp_eth/test_apps/main/CMakeLists.txt     |  1 +
 .../test_apps/main/esp_eth_test_emac_init.cpp | 66 +++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 components/esp_eth/test_apps/main/esp_eth_test_emac_init.cpp

diff --git a/components/esp_eth/test_apps/main/CMakeLists.txt b/components/esp_eth/test_apps/main/CMakeLists.txt
index 762a8c213f..e59653346d 100644
--- a/components/esp_eth/test_apps/main/CMakeLists.txt
+++ b/components/esp_eth/test_apps/main/CMakeLists.txt
@@ -4,6 +4,7 @@ idf_component_register(SRCS "esp_eth_test_main.c"
                             "esp_eth_test_utils.c"
                             "esp_eth_test_esp_emac.c"
                             "esp_eth_test_emac_sleep_retention.c"
+                            "esp_eth_test_emac_init.cpp"
                        INCLUDE_DIRS "."
                        PRIV_INCLUDE_DIRS "."
                        PRIV_REQUIRES unity esp_eth esp_netif esp_http_client esp_driver_gpio esp_driver_uart
diff --git a/components/esp_eth/test_apps/main/esp_eth_test_emac_init.cpp b/components/esp_eth/test_apps/main/esp_eth_test_emac_init.cpp
new file mode 100644
index 0000000000..79d429873e
--- /dev/null
+++ b/components/esp_eth/test_apps/main/esp_eth_test_emac_init.cpp
@@ -0,0 +1,66 @@
+/*
+ * SPDX-FileCopyrightText: 2022-2026 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+
+// Initialize the Ethernet stack compiling as C++ to catch possible C++ specific build issues.
+#include "sdkconfig.h"
+#include "esp_eth_mac.h"
+#include "esp_eth_mac_esp.h"
+#include "esp_eth_phy.h"
+#include "esp_eth_driver.h"
+
+#if CONFIG_ETH_USE_ESP32_EMAC
+static void cpp_eth_init_internal_emac(void) __attribute__((unused));
+static void cpp_eth_init_internal_emac(void)
+{
+    eth_mac_config_t mac_config = ETH_MAC_DEFAULT_CONFIG();
+
+    eth_phy_config_t phy_config = ETH_PHY_DEFAULT_CONFIG();
+    eth_esp32_emac_config_t esp32_config = ETH_ESP32_EMAC_DEFAULT_CONFIG();
+
+    esp_eth_mac_t *mac = esp_eth_mac_new_esp32(&esp32_config, &mac_config);
+    if (mac == nullptr) {
+        return;
+    }
+    esp_eth_phy_t *phy = esp_eth_phy_new_generic(&phy_config);
+    if (phy == nullptr) {
+        (void)mac->del(mac);
+        return;
+    }
+    esp_eth_config_t eth_config = ETH_DEFAULT_CONFIG(mac, phy);
+    esp_eth_handle_t handle = nullptr;
+    if (esp_eth_driver_install(&eth_config, &handle) != ESP_OK) {
+        (void)phy->del(phy);
+        (void)mac->del(mac);
+        return;
+    }
+    (void)esp_eth_driver_uninstall(handle);
+    (void)phy->del(phy);
+    (void)mac->del(mac);
+}
+
+#endif // CONFIG_ETH_USE_ESP32_EMAC
+
+#if CONFIG_ETH_USE_SPI_ETHERNET
+#include "ethernet_init.h"
+
+static void cpp_eth_spi_custom_driver_config(void) __attribute__((unused));
+static void cpp_eth_spi_custom_driver_config(void)
+{
+    volatile eth_spi_custom_driver_config_t cfg = ETH_DEFAULT_SPI;
+    (void)cfg;
+}
+
+static void cpp_eth_init_spi(void) __attribute__((unused));
+static void cpp_eth_init_spi(void)
+{
+    esp_eth_handle_t *handles = nullptr;
+    uint8_t cnt = 0;
+    (void)ethernet_init_all(&handles, &cnt);
+    if (handles != nullptr && cnt > 0) {
+        (void)ethernet_deinit_all(handles);
+    }
+}
+#endif // CONFIG_ETH_USE_SPI_ETHERNET