Adding CMakeLists.txt files for NUCLEO_G431KB

Author: Tauno Magnusson

targets/TARGET_STM/TARGET_STM32G4/TARGET_STM32G431xB/CMakeLists.txt

@@ -1,6 +1,10 @@
 # Copyright (c) 2020 ARM Limited. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
+if("NUCLEO_G474RE" IN_LIST MBED_TARGET_LABELS)
+    add_subdirectory(TARGET_NUCLEO_G431KB)
+endif()
+
 if(${MBED_TOOLCHAIN} STREQUAL "GCC_ARM")
     set(STARTUP_FILE TOOLCHAIN_GCC_ARM/startup_stm32g431xx.S)
     set(LINKER_FILE TOOLCHAIN_GCC_ARM/stm32g431xb.ld)
@@ -13,6 +17,7 @@ set_property(GLOBAL PROPERTY MBED_TARGET_LINKER_FILE ${CMAKE_CURRENT_SOURCE_DIR}
 
 target_sources(mbed-core
     INTERFACE
+    	system_clock.c
         ${STARTUP_FILE}
 )
 

targets/TARGET_STM/TARGET_STM32G4/TARGET_STM32G431xB/TARGET_NUCLEO_G431KB/CMakeLists.txt

@@ -0,0 +1,12 @@
+# Copyright (c) 2020 ARM Limited. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+target_sources(mbed-core
+    INTERFACE
+        PeripheralPins.c
+)
+
+target_include_directories(mbed-core
+    INTERFACE
+        .
+)