RIOT/cpu/avr8_common/Makefile.dep

# avr libc needs some RIOT-specific support code
USEMODULE += avr_libc_extra

# tell the build system to build the avr8 common files
USEMODULE += avr8_common avr8_common_periph

# All avr8 CPUs provide PM
DEFAULT_MODULE += pm_layered

# The AVR-libc provides no thread safe malloc implementation and has no hooks
# to inject. Use malloc_thread_safe to link calls to malloc to safe wrappers
# instead.
USEMODULE += malloc_thread_safe

# The AVR-libc provides no strerror, so we provide it via tiny_strerror
USEMODULE += tiny_strerror_as_strerror

# static C++ constructors need guards for thread safe initialization
ifneq (,$(filter cpp,$(FEATURES_USED)))
  USEMODULE += cxx_ctor_guards
endif