CC=$(ARM_CC)
LIBS=-L$(NEWLIB_NANO)/arm-none-eabi/lib/thumb/v7e-m/fpv4-sp/hard -lc -lm -lgcc
-STM32F4_CFLAGS=-mlittle-endian -mcpu=cortex-m4 -mthumb \
+STM32F4_CFLAGS=-mlittle-endian -mcpu=cortex-m4 -mthumb -mfloat-abi=hard \
-I$(TOPDIR)/stm32f4 $(AO_CFLAGS) $(NEWLIB_CFLAGS)