esp_netif: added missing C++ guards

Closes https://github.com/espressif/esp-idf/issues/4389

components/esp_netif/include/esp_netif.h

@@ -22,6 +22,10 @@
 #include "esp_netif_types.h"
 #include "esp_netif_defaults.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 //
 // Note: tcpip_adapter legacy API has to be included by default to provide full compatibility
 //  for applications that used tcpip_adapter API without explicit inclusion of tcpip_adapter.h
@@ -736,4 +740,8 @@ size_t esp_netif_get_nr_of_ifs(void);
  * @}
  */
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /*  _ESP_NETIF_H_ */

components/esp_netif/include/esp_netif_defaults.h

@@ -15,6 +15,10 @@
 #ifndef _ESP_NETIF_DEFAULTS_H
 #define _ESP_NETIF_DEFAULTS_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 //
 // Macros to assemble master configs with partial configs from netif, stack and driver
 //
@@ -85,4 +89,8 @@ extern const esp_netif_inherent_config_t _g_esp_netif_inherent_sta_config;
 extern const esp_netif_inherent_config_t _g_esp_netif_inherent_ap_config;
 extern const esp_netif_inherent_config_t _g_esp_netif_inherent_eth_config;
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif //_ESP_NETIF_DEFAULTS_H

components/esp_netif/include/esp_netif_ip_addr.h

@@ -16,6 +16,11 @@
 #define _ESP_NETIF_IP_ADDR_H_
 
 #include <machine/endian.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #if BYTE_ORDER == BIG_ENDIAN
 #define esp_netif_htonl(x) ((uint32_t)(x))
 #else
@@ -95,4 +100,8 @@ typedef struct _ip_addr {
     uint8_t type;
 } esp_ip_addr_t;
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif //_ESP_NETIF_IP_ADDR_H_

components/esp_netif/include/esp_netif_net_stack.h

@@ -15,6 +15,10 @@
 #ifndef _ESP_NETIF_NET_STACK_H_
 #define _ESP_NETIF_NET_STACK_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 //
 // Network stack API: This ESP-NETIF API are supposed to be called only from internals of TCP/IP stack
 //
@@ -76,4 +80,8 @@ void esp_netif_free_rx_buffer(void *esp_netif, void* buffer);
  * @}
  */
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif //_ESP_NETIF_NET_STACK_H_

components/esp_netif/include/esp_netif_sta_list.h

@@ -17,6 +17,10 @@
 
 #include "esp_netif_types.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * @brief station list info element
  */
@@ -59,4 +63,9 @@ esp_err_t esp_netif_get_sta_list(const wifi_sta_list_t *wifi_sta_list, esp_netif
 /**
  * @}
  */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif //_ESP_NETIF_STA_LIST_H_

components/esp_netif/include/esp_netif_types.h

@@ -15,6 +15,10 @@
 #ifndef _ESP_NETIF_TYPES_H_
 #define _ESP_NETIF_TYPES_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * @brief Definition of ESP-NETIF based errors
  */
@@ -198,4 +202,8 @@ struct esp_netif_config {
  */
 typedef esp_err_t (*esp_netif_receive_t)(esp_netif_t *esp_netif, void *buffer, size_t len, void *eb);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // _ESP_NETIF_TYPES_H_