sal: sid_pal: add support for cpp linker

adds `extern "C"` guards to bt_app_callbacks header for cpp support

Signed-off-by: Martin Moya <[email protected]>

Author: moyamartin

subsys/sal/sid_pal/include/bt_app_callbacks.h

@@ -11,6 +11,10 @@
 #include <zephyr/bluetooth/bluetooth.h>
 #include <zephyr/bluetooth/gatt.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * @brief check if attr is for SMP service
  * 
@@ -64,4 +68,8 @@ enum sid_ble_id_values {
 BUILD_ASSERT(_BT_ID_MAX <= CONFIG_BT_ID_MAX,
 	     "Too many BT Ids! increase CONFIG_BT_ID_MAX, to match _BT_ID_MAX");
 #endif
+
+#ifdef __cplusplus
+}
+#endif
 #endif

utils/include/settings_utils.h

@@ -10,6 +10,10 @@
 #include <stdlib.h>
 #include <stdint.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #if defined(DEPRECATED_DFU_FLAG_SETTINGS_KEY)
 typedef enum { DFU_APPLICATION, SIDEWALK_APPLICATION } app_start_t;
 app_start_t application_to_start(void);
@@ -53,4 +57,8 @@ int settings_utils_get_value_size(const char *name, size_t *len);
  */
 int settings_utils_load_immediate_value(const char *name, void *dest, size_t len);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* SETTINGS_UTILS_H */