Yet another arduino Makefile

Makefile

MCU_TARGET=atmega328p

ARDUINO_DIR=/usr/share/arduino
ARDUINO_HARDWARE:=$(ARDUINO_DIR)/hardware/arduino
ARDUINO_CORE:=$(ARDUINO_HARDWARE)/avr/cores/arduino
ARDUINO_VARIANT:=$(ARDUINO_HARDWARE)/avr/variants/standard

ARDUINO_CORE_LIBRARIES=Wire SPI

ARDUINO_LIBDIRS=Adafruit_MLX90614_Library

ARCH=avr

AVRDUDECONF := /etc/avrdude.conf

PROGPORT := /dev/arduino
PROGBAUD := 115200
PROGID := arduino

APPBAUD := 9600

# shouldn't need to touch things below here

CFLAGS+=-DF_CPU=16000000UL

PROJECT:=$(notdir $(PWD))

O:=build

PREFIX=$(if $(ARCH),$(ARCH)-,)

AVRDUDE=avrdude
AS=$(PREFIX)gcc
CC=$(PREFIX)gcc
CXX=$(PREFIX)g++
LD=$(PREFIX)g++

SRCPATHS=$(ARDUINO_CORE) $(ARDUINO_VARIANT) $(wildcard $(ARDUINO_HARDWARE)/avr/libraries/*/src) $(ARDUINO_LIBDIRS)

CFLAGS+=-Os
CFLAGS+=-mmcu=$(MCU_TARGET) -DARDUINO=185
CFLAGS+=-funsigned-char -fno-stack-protector
CFLAGS+=-ffunction-sections -fdata-sections -Wl,--gc-sections
CFLAGS+=$(patsubst %,-I%,$(SRCPATHS))

VPATH=$(foreach dir,$(SRCPATHS),$(shell find -H $(dir) -type d))

CXXSRC=$(wildcard *.cpp) $(foreach dir,$(SRCPATHS),$(shell find -H $(dir) -name '*.cpp'))
CSRC=$(wildcard *.c) $(foreach dir,$(SRCPATHS),$(shell find -H $(dir) -name '*.c'))
ASRC=$(wildcard *.S) $(foreach dir,$(SRCPATHS),$(shell find -H $(dir) -name '*.S'))

INO=$(PROJECT).ino

OBJS=	$(patsubst %.ino,$(O)/%.ino.o, $(INO)) \
	$(patsubst %.cpp,$(O)/%.cpp.o, $(notdir $(CXXSRC))) \
	$(patsubst %.c,$(O)/%.c.o, $(notdir $(CSRC))) \
	$(patsubst %.S,$(O)/%.S.o, $(notdir $(ASRC)))

# comment if your ino contains int main()
OBJ=$(OBJS)
# uncomment if your ino contains int main()
# OBJ=$(patsubst $(O)/main.cpp.o,,$(OBJS))

.PHONY: all clean functionsbysize flash console

all: $(O)/$(PROJECT).hex

clean:
	rm -r $(O)

functionsbysize: $(OBJ)
	@$(PREFIX)objdump -h $^ | grep '\.text\.' | perl -ne '/\.text\.(\S+)\s+([0-9a-f]+)/ && printf "%u\t%s\n", eval("0x$$2"), $$1;' | sort -n

flash: $(O)/$(PROJECT).hex
	@#stty $(PROGBAUD) raw ignbrk hup < $(PROGPORT)
	@#sleep 0.1
	@#@stty $(PROGBAUD) raw ignbrk hup < $(PROGPORT)
	$(AVRDUDE) -c$(PROGID) -b$(PROGBAUD) -p$(MCU_TARGET) -P$(PROGPORT) -C$(AVRDUDECONF) -U flash:w:$<
	@#stty $(APPBAUD) raw ignbrk -hup -echo ixoff < $(PROGPORT)

console: $(PROGPORT)
	@stty $(APPBAUD) raw ignbrk hup < $(PROGPORT)
	@( cat <&3 & cat >&3; trap "kill -9 $!" INT; kill %%; ) 3<>$(PROGPORT)

$(O):
	@mkdir -p "$@"

$(O)/$(PROJECT).elf: $(OBJ) | $(O)
	@echo "  LINK  " "$@"
	@$(LD) $(CFLAGS) -o $@ $^

$(O)/%.cpp.o: %.cpp | $(O)
	@echo "  CXX   " "$@"
	@$(CXX) $(CFLAGS) -c -o $@ $<

$(O)/%.c.o: %.c | $(O)
	@echo "  CC    " "$@"
	@$(CC) $(CFLAGS) -c -o $@ $<

$(O)/%.S.o: %.S | $(O)
	@echo "  ASM   " "$@"
	@$(AS) $(CFLAGS) -c -o $@ $<

$(O)/%.ino.o: %.ino | $(O)
	@echo "  INO   " "$@"
	@( echo '#include <Arduino.h>'; cat "$^"; ) | $(CXX) $(CFLAGS) -x c++ -c -o $@ -

%.hex: %.elf
	@echo "  HEX   "  "$@"
	@$(PREFIX)objcopy -j .text -j .data -O ihex $< $@