sys: auto_init: introduce new auto initialization scheme for network interfaces

sys/Makefile.include

-ifneq (,$(filter auto_init,$(USEMODULE)))
-    include $(RIOTBASE)/sys/auto_init/Makefile.include
-endif
 ifneq (,$(filter nomac,$(USEMODULE)))
     USEMODULE_INCLUDES += $(RIOTBASE)/sys/net/include
 endif

sys/auto_init/Makefile

@@ -8,4 +8,8 @@ endif
 
 DIRS += $(AUTO_INIT_MODULES)
 
+ifneq (,$(filter auto_init_ng_netif,$(USEMODULE)))
+DIRS += netif
+endif
+
 include $(RIOTBASE)/Makefile.base

sys/auto_init/Makefile.include

-# try to find the ng_netif auto init implementation in the application or in
-# the board, respectively. If it is not found, nothing is called.
-ifneq (,$(filter ng_netif,$(USEMODULE)))
-  ifneq (,$(wildcard $(APPDIR)/auto_init_ng_netif/*))
-    export AUTO_INIT_MODULES += $(APPDIR)/auto_init_ng_netif
-    export USEMODULE += auto_init_ng_netif
-  else
-    ifneq (,$(wildcard $(RIOTBOARD)/$(BOARD)/auto_init_ng_netif/*))
-      export AUTO_INIT_MODULES += $(RIOTBOARD)/$(BOARD)/auto_init_ng_netif
-      export USEMODULE += auto_init_ng_netif
-    endif
-  endif
-endif

sys/auto_init/auto_init.c

@@ -306,8 +306,4 @@ void auto_init(void)
     DEBUG("Auto init UDP module.\n");
     ng_udp_init();
 #endif
-#ifdef MODULE_AUTO_INIT_NG_NETIF
-    DEBUG("Auto init network interfaces.\n");
-    auto_init_ng_netif();
-#endif
 }

sys/auto_init/netif/Makefile

+MODULE = auto_init_ng_netif
+
+include $(RIOTBASE)/Makefile.base

sys/include/auto_init.h

@@ -49,22 +49,6 @@ extern "C" {
  */
 void auto_init(void);
 
-/**
- * @brief Initialize network interfaces and register them with ng_netif
- *
- *        This function must be implemented in the board or in the application,
- *        in a subfolder that must be named auto_init_ng_netif
- *        This function is called under two conditions:
- *          1. the ng_netif module is used (USEMODULE contains ng_netif)
- *          2. the board or the application contains a subfolder called
- *             auto_init_ng_netif
- *        If the board and the application both contain the mentioned subfolder,
- *        the contents from the applications subfolder have a higher priority
- *        and will be compiled and linked, while the board's subfolder is then
- *        ignored.
- */
-void auto_init_ng_netif(void);
-
 #ifdef __cplusplus
 }
 #endif