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

# Ensure newlib is not added if picolibc is already in FEATURES_USED or USEMODULE.
# nucleo-l011k4 doesn't use features to forces picolibc but directly set it in
# USEMODULE. This is because during the first pass of the dependency resolution,
# with the feature mechanism, the picolib feature is not present in FEATURES_USED
# at this staged and as a result newlib modules are wrongly added.
ifneq (,$(filter picolibc,$(FEATURES_USED) $(USEMODULE)))
  # Use Picolibc when explicitly selected
  USEMODULE += picolibc
else
  # all cortex MCU's use newlib as libc
  USEMODULE += newlib
  # use the nano-specs of Newlib when available
  USEMODULE += newlib_nano
endif

# 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

# Enable the MPU stack guard if develhelp is enabled
ifeq (1, $(DEVELHELP))
  FEATURES_OPTIONAL += cortexm_mpu
endif

# Make calls to malloc and friends thread-safe
USEMODULE += malloc_thread_safe