Problems using/creating a shared library

This is a discussion on Problems using/creating a shared library within the C++ Programming forums, part of the General Programming Boards category; Hello, recently i tried to compile a program using a library i had created following a short instructed tutorial - ...

  1. #1
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    Problems using/creating a shared library

    Hello,
    recently i tried to compile a program using a library i had created following a short instructed tutorial - without success.
    To get the library from the file special.cpp i had used the following two commands:
    Code:
    g++ -fPIC -c special.cpp          
    g++ -shared -Wl,-soname,libspecial.so.1 -o libspecial.so.1.0 special.o
    Afterwards i copied libspecial.so and libspecial.so.1 to $MYLIB/lib/ ($MYLIB is just a directory somewhere under my /home/"username"/ directory) and a header with declarations (special.h) to $MYLIB/lib/ .
    After invoking the compiler
    Code:
    g++-4.2 -Wall -g -o lib lib.cpp -I$MYLIB/include -L$MYLIB/lib -lspecial
    i got a nice little error, complaining my library would not exist:
    Code:
    /usr/bin/ld: cannot find -lspecial
    collect2: ld returned 1 exit status
    What went wrong?

    By the way, this is my third approach to post this. I might be a bit confused, as i hit the back button of my browser two times in order to correct a mistake - after being forced to login again, i realized this is the wrong procedure to correct a misspelled word :P.

  2. #2
    Cat without Hat CornedBee's Avatar
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    The linker searches for libspecial.so. It won't find libspecial.so.1.0. You need to symlink the versioned name to the unversioned name:
    Code:
    ln -s libspecial.so.1.0 libspecial.so
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

  3. #3
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    Great thanks for your answer, now it works all fine .

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