build system: Initial cmake support, work in progress

components/lwip/CMakeLists.txt

@@ -0,0 +1,37 @@
+set(COMPONENT_ADD_INCLUDEDIRS
+	include/lwip
+	include/lwip/port
+	include/lwip/posix
+	apps/ping
+    )
+
+if(CONFIG_PPP_SUPPORT)
+set(LWIP_PPP_DIRS netif/ppp/polarssl netif/ppp)
+endif()
+
+set(COMPONENT_SRCDIRS
+	api
+	apps apps/sntp apps/ping
+	core core/ipv4 core/ipv6
+	${LWIP_PPP_DIRS} netif
+	port/freertos port/netif port/debug port)
+
+register_component()
+
+target_compile_options(lwip PRIVATE
+	-Wno-address
+)
+
+# patch around warnings in third-party files
+set_source_files_properties(api/tcpip.c
+  PROPERTIES COMPILE_FLAGS
+  -Wno-unused-variable
+  )
+set_source_files_properties(core/pbuf.c core/tcp_in.c
+  PROPERTIES COMPILE_FLAGS
+  -Wno-unused-but-set-variable
+  )
+set_source_files_properties(apps/dhcpserver.c
+  PROPERTIES COMPILE_FLAGS
+  "-Wno-unused-variable -Wno-unused-but-set-variable -Wno-type-limits"
+  )