How to create a library

This is a discussion on How to create a library within the Linux Programming forums, part of the Platform Specific Boards category; Hi there, I'm a newbie in C and I made some functions, but now I wanna use them as libraries. ...

  1. #1
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    How to create a library

    Hi there,
    I'm a newbie in C and I made some functions, but now I wanna use them as libraries.
    I create a function corr() in a file corr.c and corr.h and compile that with:
    gcc -c corr.c -o corr.o. Now everytime I need to use my function on a program I have to write include the line #include <corr.h> and then type

    gcc corr.o myprog.c -o myprog

    I want to know if there is any way that I needed to include the line #include <corr.h> in my program and I only had to type:

    gcc myprog.c -o myprog

    in order to compile?
    I apreciate if anyone could send me a link where I can find the info I need or if anyone can explain how do I do that.

    Thanks for any help!
    Fernando

  2. #2
    Registered User rohit's Avatar
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    even when you have the library with you you can not do
    gcc myprog.c -o myprog

    to generate myprog binary you will have to link it with your library.


    gcc -o myprog -L/usr/lib/yourlibrary -I/yourincludepath myprog.c



    cheers
    Rohit

  3. #3
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    make library such as stdio.h

    I have the same question.
    How do I made my own library, so I could use it like:

    #include <stdio.h>
    #include <mylib.h>

    without specifying the library path (you don't have to specify
    the path for 'stdio.h', do you)?

  4. #4
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    This is the syntax for IRIX 6.5. It should be similair for your version of linux.

    To compile a library:
    cc -shared corr.c -o libcorr.so

    This will create a shared object. you will need to place the file in a directory specified in your LD_LIBRARY_PATH environment variable.

    To compile the executable:
    cc myprog.c -lcorr -o myprog

    The option -lxxx links in objects from the libxxx.so or libxxx.a (in that order) from directories in the LD_LIBRARY_PATH

    This is just like when you use math.h, you have to include the -lm option when you compile.

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