Create a shared library on Linux

1. Library source code (file name: pos_conf.c)

    #include <stdio.h>

    void pos (void)

    {

        printf("/home/owen/codeblocks_prj/lib\n");

    }

2. Shared library compiling

    gcc -o libpos.so -fPIC -shared pos_conf.c

    or

    gcc -fPIC -c pos_conf.c

    gcc -o libpos.so -shared pos_conf.o

3. Main function

    void pos(void);

    int main (void)

    {

        pos();

        return 0;

    }

4. Main executable compling

    gcc -o pos.exe main.c -lpos -L.

    or

    gcc -o pos.exe main.c libpos.so

[Note]
Add the running time library path
gcc -o pos.exe main.c -lpos -L. -Wl,-rpath,/home/owen/codeblocks_prj/lib