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makefile

Posted on 2004-08-26
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Last Modified: 2010-04-15
This is a sample makefile. Pls explain

myprog: prog.o func.o
       cc prog.o func.o -o myprog
prog.o: prog.c head.h
       cc -c prog.c
func.o: func.c
       cc -c func.c
clean:
      rm *.o core  
print:
      lpr -Papm2337 *.c *.h
backup:
      cp *.c *.h Makefile backupdir
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Question by:manojantony
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by:avizit
ID: 11909867
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pankajtiwary earned 30 total points
ID: 11910116
myprog: prog.o func.o
>> The target myprog(executable, your ultimate target) needs prog.o and func.o as input files.
      cc prog.o func.o -o myprog
>> And above is the command to make myprog from the prog.o an func.o input files.
prog.o: prog.c head.h
>> similarly to produce prog.o you need prog.c and head.h as input files
      cc -c prog.c
>> similarly the command to make prog.o from the input files is above
func.o: func.c
>> To produce func.o you just need func.c and nothing else
      cc -c func.c
>> Above is the command to produce func.o from func.c
clean:
     rm *.o core
>> When you say "ake clean" the above command will be executed which will remove the intermediate files i.e. object files
print:
     lpr -Papm2337 *.c *.h
>> When you say "make print", the above command will be executed and the *.c and *.h files will be sent to the printer device.
backup:
     cp *.c *.h Makefile backupdir
>> When you say make backup, it will execute the above command.

To understand, just remember a make file needs to know which are the targets to make and the rule how to make that target. Each of the section above shows this and nothing else.
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by:manojantony
ID: 11910245
thanx buddy.
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