lwip: make some of the component dependencies optional

components/lwip/CMakeLists.txt

@@ -86,7 +86,6 @@ set(srcs
     "port/esp32/hooks/lwip_default_hooks.c"
     "port/esp32/debug/lwip_debug.c"
     "port/esp32/freertos/sys_arch.c"
-    "port/esp32/netif/dhcp_state.c"
     "port/esp32/netif/wlanif.c")
 
 if(CONFIG_LWIP_PPP_SUPPORT)
@@ -148,11 +147,15 @@ if(CONFIG_LWIP_DHCPS)
     list(APPEND srcs "apps/dhcpserver/dhcpserver.c")
 endif()
 
+if(CONFIG_LWIP_DHCP_RESTORE_LAST_IP)
+    list(APPEND srcs "port/esp32/netif/dhcp_state.c")
+endif()
+
 idf_component_register(SRCS "${srcs}"
                     INCLUDE_DIRS "${include_dirs}"
                     LDFRAGMENTS linker.lf
                     REQUIRES vfs esp_wifi
-                    PRIV_REQUIRES esp_eth esp_netif tcpip_adapter nvs_flash openthread)
+                    PRIV_REQUIRES esp_netif tcpip_adapter)
 
 # lots of LWIP source files evaluate macros that check address of stack variables
 target_compile_options(${COMPONENT_LIB} PRIVATE -Wno-address)
@@ -174,3 +177,15 @@ set_source_files_properties(
     PROPERTIES COMPILE_FLAGS
     -Wno-type-limits
 )
+
+if(CONFIG_OPENTHREAD_ENABLED)
+    idf_component_optional_requires(PRIVATE openthread)
+endif()
+
+if(CONFIG_ETH_ENABLED)
+    idf_component_optional_requires(PRIVATE esp_eth)
+endif()
+
+if(CONFIG_LWIP_DHCP_RESTORE_LAST_IP)
+    idf_component_optional_requires(PRIVATE nvs_flash)
+endif()

tools/test_apps/system/g1_components/CMakeLists.txt

@@ -37,8 +37,6 @@ set(extra_components_which_shouldnt_be_included
     #   efuse and app_update should be removed from G1 build;
     #   [refactor-todo]: see if the dependency from spi_flash can be made weak
     bootloader_support
-    # console is pulled in by openthread, which should be removed
-    console
     # [refactor-todo]: should cxx be in G1? Can it exist without FreeRTOS?
     cxx
     # [refactor-todo]: driver is a dependency of esp_pm, esp_timer, spi_flash, vfs, esp_wifi, ${IDF_TARGET}
@@ -79,9 +77,6 @@ set(extra_components_which_shouldnt_be_included
     # esptool_py is a dependency of bootloader, esp_wifi, app_update, partition_table, all of which
     #   should be removed from G1-only build.
     esptool_py
-    # a recent addition to the G1-only build, ieee802154 is a dependency of openthread, to be removed
-    #  once openthread is (easily) removed.
-    ieee802154
     # lwip is a common component due to "sys/socket.h" header.
     #   [refactor-todo] consider adding a system-level sys/socket.h in newlib instead
     lwip
@@ -90,11 +85,8 @@ set(extra_components_which_shouldnt_be_included
     mbedtls
     # nvs_flash is required by:
     #   esp_system — no obvious reason, [refactor-todo] why?
-    #   lwip — can be turned into a weak dependency
     #   esp_wifi, esp_phy — both should be removed
     nvs_flash
-    # openthread is a dependency of lwip, it is easy to turn it into a conditional one
-    openthread
     # partition_table is pulled in by app_update, esptool_py, bootloader; all to be removed
     partition_table
     # pthread is required by esp_system (for initialization only, can be made a weak dependency)