How should i build a shared library?

vim hello.c

 

#include <stdio.h>

 

void hello(void)

{

    printf("Hello Cruel World/n");

}

 

vim main.c

 

#include <stdio.h>

 

int main(void)

{

    hello();

 

    return 0;

}

 

 

gcc -shared -o libhello.so -fPIC hello.c

 

gcc main.c libhello.so -o main

 

ldd main

 

sudo cp libhello.so  /usr/lib/

 

./main

...

(enjoy it !)