Makefile for teensy 3.0 hello world in C

gistfile1.txt

TARGET = main

OPTIONS = -DF_CPU=48000000 -DUSB_SERIAL -DLAYOUT_US_ENGLISH
OPTIONS += -D__MK20DX128__ -DARDUIO=104

# path location for Teensy Loader, teensy_post_compile and teensy_reboot
ARDUINO_PATH= $(HOME)/work/arduino
TOOLSPATH= $(ARDUINO_PATH)/hardware/tools
MCU_LINKER_SCRIPT = $(ARDUINO_PATH)/hardware/teensy/cores/teensy3/mk20dx128.ld

# path location for Arduino libraries (currently not used)
LIBRARYPATH = $(ARDUINO_PATH)/libraries

# path location for the arm-none-eabi compiler
COMPILERPATH = $(TOOLSPATH)/arm-none-eabi/bin

# CPPFLAGS = compiler options for C and C++
CPPFLAGS = -Wall -g -Os -mcpu=cortex-m4 -mthumb -nostdlib -MMD $(OPTIONS) -I. -I$(ARDUINO_PATH)/hardware/teensy/cores/teensy3/

# compiler options for C++ only
CXXFLAGS = -std=gnu++0x -felide-constructors -fno-exceptions -fno-rtti

# compiler options for C only
CFLAGS =

# linker options
LDFLAGS = -Os -Wl,--gc-sections -mcpu=cortex-m4 -mthumb -T$(MCU_LINKER_SCRIPT)

# additional libraries to link
LIBS = -lm

# names for the compiler programs
CC = $(abspath $(COMPILERPATH))/arm-none-eabi-gcc
CXX = $(abspath $(COMPILERPATH))/arm-none-eabi-g++
OBJCOPY = $(abspath $(COMPILERPATH))/arm-none-eabi-objcopy
SIZE = $(abspath $(COMPILERPATH))/arm-none-eabi-size

# automatically create lists of the sources and objects
# TODO: this does not handle Arduino libraries yet...
C_FILES := $(wildcard *.c)
CPP_FILES := $(wildcard *.cpp)
OBJS := $(C_FILES:.c=.o) $(CPP_FILES:.cpp=.o) $(wildcard $(ARDUINO_PATH)/hardware/teensy/cores/teensy3/*.o)

# the actual makefile rules (all .o files built by GNU make's default implicit rules)

all: $(TARGET).hex

$(TARGET).elf: $(OBJS) $(MCU_LINKER_SCRIPT)
        $(CC) $(LDFLAGS) -o $@ $(OBJS)

%.hex: %.elf
        $(SIZE) $<
        $(OBJCOPY) -O ihex -R .eeprom $< $@ 
        $(abspath $(TOOLSPATH))/teensy_post_compile -file=$(basename $@) -path=$(shell pwd) -tools=$(abspath $(TOOLSPATH)) 
        -$(abspath $(TOOLSPATH))/teensy_reboot


# compiler generated dependency info
-include $(OBJS:.o=.d)

clean:
        rm -f *.o *.d $(TARGET).elf $(TARGET).hex