CC = arm-none-eabi-gcc
  CXX = arm-none-eabi-g++
  LD = arm-none-eabi-gcc
  GDB = arm-none-eabi-gdb
  OBJCOPY = arm-none-eabi-objcopy
  SIZE = arm-none-eabi-size
  
  ifeq ($(DEBUG),1)
  SFLAGS += -ggdb3
  else
  SFLAGS += -fdata-sections -ffunction-sections
  LDFLAGS += -Wl,--gc-sections
  endif
  SFLAGS += -mthumb -march=armv7e-m -mfloat-abi=hard -mcpu=cortex-m4 -mfpu=fpv4-sp-d16
  LDFLAGS += $(SFLAGS) -lgcc -Wl,-T,$(LDSCRIPT)