Silence expansion-to-defined in nrfx

Author: Johnny Robeson

targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_SDK_15_0/CMakeLists.txt

@@ -3,9 +3,12 @@
 
 add_library(mbed-sdk-15-0 INTERFACE)
 
+# Silence unfixable warning in nrfx
+target_compile_options(mbed-sdk-15-0 INTERFACE -Wno-expansion-to-defined)
+
 add_subdirectory(TARGET_SOFTDEVICE_NONE EXCLUDE_FROM_ALL)
 add_subdirectory(components EXCLUDE_FROM_ALL)
 add_subdirectory(integration EXCLUDE_FROM_ALL)
 add_subdirectory(modules EXCLUDE_FROM_ALL)
 
-target_link_libraries(mbed-sdk-15-0 INTERFACE mbed-softdevice-none)
+target_link_libraries(mbed-sdk-15-0 INTERFACE mbed-softdevice-none)