Makefile

   1 .PHONY: all clean flash
   2 CHIP ?= 4
   3
   4 all: foo.elf
   5
   6 foo.elf: foo.S
   7         avr-gcc -Os -nostdlib -mmcu=attiny$(CHIP) -o $@ $<
   8         avr-size -C --mcu=attiny$(CHIP) $@
   9
  10 flash: foo.elf
  11         avrdude -cusbasp -Pusb -pt$(CHIP) -Uflash:w:$<:e
  12
  13 clean:
  14         rm -f foo.elf