compilation problem

This is a discussion on compilation problem within the C Programming forums, part of the General Programming Boards category; i have a class name 1.c in tht i am using function n wich has his body in 2.c and ...

  1. #1
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    compilation problem

    i have a class name 1.c in tht i am using function n wich has his body in 2.c and declaration in 2.h
    now how can i compile 1.c.
    ex;
    Code:
    1.c
    int main()
    {
    //some data
    n(10);
    //somedata
    }
    *****
    2.c
    int n(int k)
    {
    //some data
    
    }
    int main()
    {
    some data
    }
    *****
    2.h
    int n(int k);
    i complied the progam using command as : cc 1.c -o 1 -lm
    i got the error as;
    1.c.text+0xd5): undefined reference to `n'.
    thank u,
    sree

  2. #2
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    You need to compile in 2.c too. Or compile 2.c with "cc -c 2.c" and link in 2.o with "cc -o 1 1.c 2.o -lm"

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  3. #3
    Cogito Ergo Sum
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    did you remember to have the #include <2.h> or #include <1.h> header files?

    undefined reference because they are in another file and you need to include them.

  4. #4
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    Quote Originally Posted by JFonseka View Post
    did you remember to have the #include <2.h> or #include <1.h> header files?

    undefined reference because they are in another file and you need to include them.

    No, the error indicated is from the linker, which means that it's compiled correctly, but not completed the linking step.

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  5. #5
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    thank u for ur response
    i tried to complie 2.c
    i got tht following error.
    (.text+0x18): undefined reference to `main'
    in 2.c no main() function so how can i compile.
    thank u,
    sree

  6. #6
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    Quote Originally Posted by cnu_sree View Post
    thank u for ur response
    i tried to complie 2.c
    i got tht following error.
    (.text+0x18): undefined reference to `main'
    in 2.c no main() function so how can i compile.
    thank u,
    sree
    Yes, you need "-c" to make it compile on it's own into a .o file - without -c, it tries to link it into an executable file, which assumes your code contains a "main".

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  7. #7
    and the hat of wrongness Salem's Avatar
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    Or you can do it all on one line (not recommended for larger programs, look into using make)

    cc 1.c 2.c -o 1 -lm
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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