makefile question

This is a discussion on makefile question within the C Programming forums, part of the General Programming Boards category; Hello, I am working on an assignment for class and one of the specifications is that "the program must be ...

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    makefile question

    Hello,
    I am working on an assignment for class and one of the specifications is that "the program must be divided into the five files main.c, flight.c, flight.h, passenger.c, passenger.h, as well as a makefile to create this program." I have already written the different functions needed to execute the program, I am just having a really hard time understanding how to go about creating this makefile. I have talked to the professor and other students, but its just not clicking. Could you help explain how this is supposed to work?
    Thank you so much,
    John

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    Did you Google "makefile" as there are lots of online tutorials for creating a makefile from scratch.

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    i did, but i guess what i'm having trouble understanding is where the ' .o ' files are coming from. I was told we need to include a main.o, flight.o, and passenger.o when creating the make file, but I'm unsure of where they are coming from.

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    The ".o" files are object modules and are generated by modifying the behavior of the compiler with the "-c" switch.
    Lookup the man page of the C compiler on your machine and scroll down to the "-c" option - RTM.
    However, there's no need to specify how to create the ".o" files because make is smart enough to figure it out for you.

    For example the command to create a load module from three source modules would be:
    Code:
    prog:  file1.o file2.o file3.o
           cc file1.o file2.o file3.o -o prog

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    Quote Originally Posted by itCbitC View Post
    For example the command to create a load module from three source modules would be:
    Of course, such a simple makefile doesn't represent dependencies properly, but for the purposes of the assignment it's probably enough.
    Code:
    //try
    //{
    	if (a) do { f( b); } while(1);
    	else   do { f(!b); } while(1);
    //}

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    Quote Originally Posted by brewbuck View Post
    Of course, such a simple makefile doesn't represent dependencies properly, but for the purposes of the assignment it's probably enough.
    Just my 2c for what it's worth altho' a complex makefile example would have caused more confusion for the o/p, methinks.

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