RIOT/cpu/cortexm_common/Makefile.dep

# Tell the build system that the CPU depends on the Cortex-M common files:
USEMODULE += cortexm_common

# include common periph code
USEMODULE += cortexm_common_periph

# all cortex MCU's use newlib as libc
USEMODULE += newlib

# use the nano-specs of Newlib when available
USEMODULE += newlib_nano

# Export the peripheral drivers to be linked into the final binary:
USEMODULE += periph

# Use Hardware FPU by default if present
FEATURES_OPTIONAL += cortexm_fpu
ifneq (,$(filter cortexm_fpu,$(FEATURES_USED)))
  DEFAULT_MODULE += cortexm_fpu
endif