# check that one, and only one log backend is being used
USED_LOG_BACKENDS := $(sort $(filter log_%,$(USEMODULE)))

ifeq (0,$(words $(USED_LOG_BACKENDS)))
  $(error The log module is being used but no backend is provided.)
else ifeq (1,$(words $(USED_LOG_BACKENDS)))
  # only one backend is provided, this is correct
else
  $(info Only one log backend can be used at a time.)
  $(error Currently selecting: $(USED_LOG_BACKENDS))
endif

ifneq (,$(filter log_printfnoformat,$(USEMODULE)))
  USEMODULE_INCLUDES += $(RIOTBASE)/sys/log/log_printfnoformat
endif

ifneq (,$(filter log_color,$(USEMODULE)))
  USEMODULE_INCLUDES += $(RIOTBASE)/sys/log/log_color
endif