This Makefile appears in the avr-libc documentation.

Makefile

PRG	    = demo
OBJ	    = demo.o
#MCU_TARGET     = at90s2313
#MCU_TARGET     = at90s2333
#MCU_TARGET     = at90s4414
#MCU_TARGET     = at90s4433
#MCU_TARGET     = at90s4434
#MCU_TARGET     = at90s8515
#MCU_TARGET     = at90s8535
#MCU_TARGET     = atmega128
#MCU_TARGET     = atmega1280
#MCU_TARGET     = atmega1281
#MCU_TARGET     = atmega1284p
#MCU_TARGET     = atmega16
#MCU_TARGET     = atmega163
#MCU_TARGET     = atmega164p
#MCU_TARGET     = atmega165
#MCU_TARGET     = atmega165p
#MCU_TARGET     = atmega168
#MCU_TARGET     = atmega169
#MCU_TARGET     = atmega169p
#MCU_TARGET     = atmega2560
#MCU_TARGET     = atmega2561
#MCU_TARGET     = atmega32
#MCU_TARGET     = atmega324p
#MCU_TARGET     = atmega325
#MCU_TARGET     = atmega3250
#MCU_TARGET     = atmega329
#MCU_TARGET     = atmega3290
#MCU_TARGET     = atmega48
#MCU_TARGET     = atmega64
#MCU_TARGET     = atmega640
#MCU_TARGET     = atmega644
#MCU_TARGET     = atmega644p
#MCU_TARGET     = atmega645
#MCU_TARGET     = atmega6450
#MCU_TARGET     = atmega649
#MCU_TARGET     = atmega6490
MCU_TARGET     = atmega8
#MCU_TARGET     = atmega8515
#MCU_TARGET     = atmega8535
#MCU_TARGET     = atmega88
#MCU_TARGET     = attiny2313
#MCU_TARGET     = attiny24
#MCU_TARGET     = attiny25
#MCU_TARGET     = attiny26
#MCU_TARGET     = attiny261
#MCU_TARGET     = attiny44
#MCU_TARGET     = attiny45
#MCU_TARGET     = attiny461
#MCU_TARGET     = attiny84
#MCU_TARGET     = attiny85
#MCU_TARGET     = attiny861
OPTIMIZE       = -O2
 
DEFS	   =
LIBS	   =
 
# You should not have to change anything below here.
 
CC	     = avr-gcc
 
# Override is only needed by avr-lib build system.
 
override CFLAGS	= -g -Wall $(OPTIMIZE) -mmcu=$(MCU_TARGET) $(DEFS)
override LDFLAGS       = -Wl,-Map,$(PRG).map
 
OBJCOPY	= avr-objcopy
OBJDUMP	= avr-objdump
 
all: $(PRG).elf lst text eeprom
 
$(PRG).elf: $(OBJ)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
 
# dependency:
demo.o: demo.c iocompat.h
 
clean:
	rm -rf *.o $(PRG).elf *.eps *.png *.pdf *.bak 
	rm -rf *.lst *.map $(EXTRA_CLEAN_FILES)
 
lst:  $(PRG).lst
 
%.lst: %.elf
	$(OBJDUMP) -h -S $< > $@
 
# Rules for building the .text rom images
 
text: hex bin srec
 
hex:  $(PRG).hex
bin:  $(PRG).bin
srec: $(PRG).srec
 
%.hex: %.elf
	$(OBJCOPY) -j .text -j .data -O ihex $< $@
 
%.srec: %.elf
	$(OBJCOPY) -j .text -j .data -O srec $< $@
 
%.bin: %.elf
	$(OBJCOPY) -j .text -j .data -O binary $< $@
 
# Rules for building the .eeprom rom images
 
eeprom: ehex ebin esrec
 
ehex:  $(PRG)_eeprom.hex
ebin:  $(PRG)_eeprom.bin
esrec: $(PRG)_eeprom.srec
 
%_eeprom.hex: %.elf
	$(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O ihex $< $@ \
	|| { echo empty $@ not generated; exit 0; }
 
%_eeprom.srec: %.elf
	$(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O srec $< $@ \
	|| { echo empty $@ not generated; exit 0; }
 
%_eeprom.bin: %.elf
	$(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O binary $< $@ \
	|| { echo empty $@ not generated; exit 0; }
 
# Every thing below here is used by avr-libc's build system and can be ignored
# by the casual user.
 
FIG2DEV		 = fig2dev
EXTRA_CLEAN_FILES       = *.hex *.bin *.srec
 
dox: eps png pdf
 
eps: $(PRG).eps
png: $(PRG).png
pdf: $(PRG).pdf
 
%.eps: %.fig
	$(FIG2DEV) -L eps $< $@
 
%.pdf: %.fig
	$(FIG2DEV) -L pdf $< $@
 
%.png: %.fig
	$(FIG2DEV) -L png $< $@