Makefile

PRJ_NAME = arion
MCU ?= atmega2560
debug ?= false
# -- Global variables --
# Enviroment variables that must be set:
# AVR_HOME = path to the avr toolchain
# BOARD_PORT = connected board port
ATMEGA_TOOLCHAIN := $(AVR_HOME)/bin
# -- GNU Tools --
AS := $(ATMEGA_TOOLCHAIN)/avr-as # Assembler
AR := $(ATMEGA_TOOLCHAIN)/avr-ar # Archiver
CC := $(ATMEGA_TOOLCHAIN)/avr-gcc # C Compiler
CXX := $(ATMEGA_TOOLCHAIN)/avr-g++ # C++ Compiler
OBJCOPY := $(ATMEGA_TOOLCHAIN)/avr-objcopy # Obj copy
OBJDUMP := $(ATMEGA_TOOLCHAIN)/avr-objdump # Obj dump
READELF := $(ATMEGA_TOOLCHAIN)/avr-readelf # Read elf
AVRDUDE := $(ATMEGA_TOOLCHAIN)/avrdude # To load programs into the boards
AVR_DEFINITIONS := -DATMEGA
ifeq (atmega328p, $(MCU))
    PLATFROM_DEFINITIONS := $(AVR_DEFINITIONS) -DATMEGA328P -DF_CPU=16000000L
    PLATFORM_FLAGS := -mmcu=atmega328p
	PROG_PROTOCOL ?= arduino
	PORT ?= $(BOARD_PORT)
endif
ifeq (atmega2560, $(MCU))
    PLATFROM_DEFINITIONS := $(AVR_DEFINITIONS) -DATMEGA2560 -DF_CPU=16000000L
    PLATFORM_FLAGS := -mmcu=atmega2560
	PROG_PROTOCOL ?= wiring
	PORT ?= $(BOARD_PORT)
endif
# -- Folder structure --
ROOT_DIR := ../..
SRC_DIR := $(ROOT_DIR)/src
CODE_DIR := $(SRC_DIR)/code
OUT_DIR := $(ROOT_DIR)/bin/$(MCU)
OUT_NAME := $(OUT_DIR)/$(PRJ_NAME)
OUTPUT := $(OUT_NAME).hex
# Make does not offer a recursive wildcard function, so here's one:
rwildcard=$(wildcard $1$2) $(foreach d,$(wildcard $1*),$(call rwildcard,$d/,$2))

CXX_SRC := $(call rwildcard,$(CODE_DIR)/,*.cpp)
CXX_OBJ := $(patsubst %.cpp, %.cpp.o, $(CXX_SRC))

TEMP_FILES := $(CXX_OBJ)

# -- Build variables --
PREPROCESSOR_DEFINITIONS := $(PLATFROM_DEFINITIONS)
WARNING_FLAGS := -Wall -Werror
INCLUDE_FLAGS := -I$(CODE_DIR) -I$(CODE_DIR)/stl
CXX_COMPILE_FLAGS := -std=c++0x -fno-rtti -fno-exceptions -ffunction-sections -fdata-sections
# TODO: May be useful to turn -fno-enforce-eh-specs on for production builds
ifeq (true, $(debug))
	DEBUG_FLAGS := -g -D_DEBUG
	OPTIMIZATION_FLAGS := # -O4
endif
ifeq (false ,$(debug))
	DEBUG_FLAGS := #-g
	OPTIMIZATION_FLAGS := -O4
endif
COMMON_C_FLAGS := $(PLATFORM_FLAGS) $(PREPROCESSOR_DEFINITIONS) $(WARNING_FLAGS)\
 			 $(INCLUDE_FLAGS) $(DEBUG_FLAGS) $(OPTIMIZATION_FLAGS)
CC_FLAGS := $(COMMON_C_FLAGS)
CXX_FLAGS := $(COMMON_C_FLAGS) $(CXX_COMPILE_FLAGS)

# -- Rules --
all: $(OUTPUT)

clean:
	rm -f $(OUTPUT) $(TEMP_FILES) $(OUT_NAME).elf

run: $(OUTPUT)
	$(AVRDUDE) -p$(MCU) -c$(PROG_PROTOCOL) -b115200 -P$(PORT) -D -Uflash:w:$^:i

%.hex: %.elf
	$(OBJCOPY) -O ihex -R .eeprom -R .fuse -R .lock -R .signature $^ $@

$(OUT_NAME).elf: $(CXX_SRC)
	$(CXX) -o $@ $^ $(CXX_FLAGS) $(REV_INCLUDE) $(LIB_DIR)

readelf: $(OUT_NAME).elf
	$(READELF) -a $^

dump: $(OUT_NAME).elf
	$(OBJDUMP) -h $^

dwarf: $(OUT_NAME).elf
	$(OBJDUMP) --dwarf=info $^

assebly: (OUT_NAME).S

$(OUT_NAME).S: $(CXX_SRC)
	$(CXX) -S -o $@ $^ $(CXX_FLAGS)

.PHONY: readelf run clean