default: app/timex.elf

app/timex.elf: libopencm3/lib/libopencm3_stm32f1.a boot/usbdfu.elf
	make -C app

boot/usbdfu.elf: libopencm3/lib/libopencm3_stm32f1.a
	make -C boot

libopencm3/lib/libopencm3_stm32f1.a:
	make -C libopencm3

.PRECIOUS: app/timex.elf libopencm3/lib/libopencm3_stm32f1.a boot/usbdfu.elf