C: include files problem

This is a discussion on C: include files problem within the Linux Programming forums, part of the Platform Specific Boards category; hello, i have been trying to get some basic code working. its some piece of userspace code that does have ...

  1. #1
    template<typename T> threahdead's Avatar
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    C: include files problem

    hello,

    i have been trying to get some basic code working.
    its some piece of userspace code that does have problems
    with including the correct files when doing the preprocessing.

    for example i have:

    Code:
    #include <linux/module.h>
    on preprocessing, the standard directory is asked for that file, that is /usr/include/* for my machine.
    the problem is that the files in that directory are very old, as they are left from the install when kernel 2.4.18 was
    current.
    i am using a 2.6 kernel now.
    further on i am trying to access elements in structs for example
    that only exist since 2.6 kernel series.
    but as the preprocessor asks /usr/include/*, i am getting:

    Code:
    file.c: In function `main':
    file.c:100: error: structure has no member named `core_size'
    in this file.c i am trying to access an element of the struct module of the 2.6 kernels.
    but as the preprocessor is referring to the old includes,
    that element obviously doesnt exist.

    now:
    how can i update my header include files to prevent
    version confusion?
    or how is it possible to redirect every #include to the
    current kernel source tree includes?
    i tried gcc -I and -L options with the current kernel source tree includes with no success and even more errors.

    thanks for your time!
    threadhead

  2. #2
    Registered User loopy's Avatar
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    Hello!

    Depending on you newer kernel installation directory, mine is always my users home, you could try to make a symlink from old source directory to new, if I have it installed in my user account home dir '/home/stratus' I could do:

    Code:
    [EnGlow][root][07:42:14][/usr/src][#] rm /usr/src/linux
    Then, create a new symlink to the new directory containing the sources:

    Code:
    [EnGlow][root][07:42:14][/usr/src][#] ln -s /home/stratus/linux-2.6.3 ./linux
    Which gives me:

    Code:
    [EnGlow][root][07:42:14][/usr/src][#] ls
    2.4.22.nat.diff  linux@  linux-2.4.22/  rpm/  xfs-2.4.22/
    [EnGlow][root][07:42:15][/usr/src][#] 
    [EnGlow][root][07:42:15][/usr/src][#] readlink ./linux
    /home/stratus/linux-2.6.3
    [EnGlow][root][07:44:41][/usr/src][#]
    HTH
    Last edited by loopy; 05-05-2004 at 07:46 PM.

  3. #3
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    Thumbs up

    Try using the force option combined with symlink option !!

    regards,
    karthik bala guru

  4. #4
    Registered User loopy's Avatar
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    Quote Originally Posted by linladen
    Try using the force option combined with symlink option !! :)

    regards,
    karthik bala guru :cool:
    Ok, LOL, *DON"T* do that, 'man ln' will tell you why.

    {edit}

    I guess that option saves a step, removing the old symlink.

    :D
    Last edited by loopy; 05-06-2004 at 08:37 AM.

  5. #5
    template<typename T> threahdead's Avatar
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    i made it work another way.
    just copied the newer kernel header to the old location
    and made it work myself.

    thanks anyway

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