Merge branch 'feature/add_lwip_to_components' into 'refactor'

Add lwip to components

See merge request sdk/ESP8266_RTOS_SDK!17

Makefile

@@ -417,9 +417,10 @@ $(foreach image,$(GEN_IMAGES),$(eval $(call MakeImage,$(basename $(image)))))
 INCLUDES := $(INCLUDES) -I $(SDK_PATH)/include -I $(SDK_PATH)/extra_include
 INCLUDES += -I $(SDK_PATH)/driver_lib/include
 INCLUDES += -I $(SDK_PATH)/include/espressif
-INCLUDES += -I $(SDK_PATH)/include/lwip
-INCLUDES += -I $(SDK_PATH)/include/lwip/ipv4
-INCLUDES += -I $(SDK_PATH)/include/lwip/ipv6
+INCLUDES += -I $(SDK_PATH)/components/lwip/include
+INCLUDES += -I $(SDK_PATH)/components/lwip/include/lwip
+INCLUDES += -I $(SDK_PATH)/components/lwip/include/lwip/ipv4
+INCLUDES += -I $(SDK_PATH)/components/lwip/include/lwip/ipv6
 INCLUDES += -I $(SDK_PATH)/include/nopoll
 INCLUDES += -I $(SDK_PATH)/include/spiffs
 INCLUDES += -I $(SDK_PATH)/include/ssl

components/lwip/component.mk

@@ -0,0 +1,9 @@
+#
+# Component Makefile
+#
+COMPONENT_ADD_INCLUDEDIRS += include/ipv4 include/ipv6 include/posix
+
+COMPONENT_SRCDIRS += source/api source/api/multi-threads source/apps source/arch \
+                     source/netif source/core source/core/ipv4 source/core/ipv6
+
+CFLAGS += -D_POSIX_SOURCE -DLWIP_OPEN_SRC -DPBUF_RSV_FOR_WLAN -DEBUF_LWIP