Switch project to GNU Make + VS Code

makefile

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+include local.make
+
+
+arduino_packages = ~/.arduino15/packages/arduino
+arduino_lib = $(arduino_packages)/hardware/avr/1.8.6
+
+
+# Flags
+debug = -g
+lto = -flto
+mcu = -mmcu=atmega32u4
+optimization = -O3
+macros = \
+	-D F_CPU=16000000L \
+	-D ARDUINO=10607 \
+	-D ARDUINO_AVR_MICRO \
+	-D ARDUINO_ARCH_AVR \
+	-D USB_PRODUCT='"Arduino Micro"' \
+	-D USB_MANUFACTURER='"Unknown"' \
+	-D USB_VID=0x2341 \
+	-D USB_PID=0x8037
+header_locations = \
+	-I $(arduino_lib)/cores/arduino \
+	-I $(arduino_lib)/variants/micro
+
+# Flag sets
+c_flags = $(debug) $(lto) $(mcu) $(optimization) $(macros) $(header_locations) \
+	-std=gnu11 \
+	-ffunction-sections \
+	-fdata-sections \
+	-fno-fat-lto-objects
+cplusplus_flags = $(debug) $(lto) $(mcu) $(optimization) $(macros) $(header_locations) \
+	-std=gnu++11 \
+	-ffunction-sections \
+	-fdata-sections \
+	-fpermissive \
+	-fno-exceptions \
+	-fno-threadsafe-statics \
+	-Wno-error=narrowing
+assembly_flags = $(debug) $(lto) $(mcu) $(macros) $(header_locations)
+linking_flags = $(debug) $(lto) $(mcu) $(optimization) \
+	-fuse-linker-plugin \
+	-Wl,--gc-sections \
+	-lm
+
+
+build/kulifuli-cpp.o : src/main.cpp
+	mkdir -p build
+	avr-g++ -c $(cplusplus_flags) -o $@ $<
+
+build/arduino-lib/%-cpp.o : $(arduino_lib)/cores/arduino/%.cpp
+	mkdir -p build/arduino-lib
+	avr-g++ -c $(cplusplus_flags) -o $@ $<
+
+build/arduino-lib/%-c.o : $(arduino_lib)/cores/arduino/%.c
+	mkdir -p build/arduino-lib
+	avr-gcc -c $(c_flags) -o $@ $<
+
+build/arduino-lib/%-s.o : $(arduino_lib)/cores/arduino/%.S
+	mkdir -p build/arduino-lib
+	avr-gcc -c $(assembly_flags) -x assembler-with-cpp -o $@ $<
+
+core_objects = $(addprefix build/arduino-lib/, \
+	abi-cpp.o \
+	CDC-cpp.o \
+	HardwareSerial-cpp.o \
+	HardwareSerial1-cpp.o \
+	new-cpp.o \
+	PluggableUSB-cpp.o \
+	Print-cpp.o \
+	Stream-cpp.o \
+	USBCore-cpp.o \
+	WMath-cpp.o \
+	WString-cpp.o \
+	hooks-c.o \
+	WInterrupts-c.o \
+	wiring_analog-c.o \
+	wiring_digital-c.o \
+	wiring_pulse-c.o \
+	wiring_shift-c.o \
+	wiring-c.o \
+	wiring_pulse-s.o \
+)
+
+build/arduino-lib/core.a : $(core_objects)
+	avr-gcc-ar rcs $@ $^
+
+# The order of the prerequisites is significant here for GCC
+build/kulifuli.elf : build/kulifuli-cpp.o build/arduino-lib/core.a
+	avr-gcc $(linking_flags) -o $@ $^
+
+build/kulifuli.eep : build/kulifuli.elf
+	avr-objcopy \
+		--output-target=ihex \
+		--only-section=.eeprom \
+		--set-section-flags=.eeprom=alloc,load \
+		--no-change-warnings \
+		--change-section-lma .eeprom=0 \
+		$< $@
+
+build/kulifuli.hex : build/kulifuli.elf
+	avr-objcopy \
+		--output-target=ihex \
+		--remove-section=.eeprom \
+		$< $@
+
+
+.PHONY : build
+build : build/kulifuli.eep build/kulifuli.hex
+
+.PHONY : upload
+upload : build/kulifuli.hex
+	stty --file=$(arduino_serial_port) speed 1200 > /dev/null
+	sleep 1
+	avrdude \
+		--part atmega32u4 \
+		--programmer avr109 \
+		--memory flash:w:build/kulifuli.hex:i \
+		--noverify-memory \
+		--noerase \
+		--port $(arduino_serial_port) \
+		--baud 57600
+
+.PHONY : clean
+clean :
+	rm -rf build/*