[GCC library compare] GCC static and share

[GCC library compare] GCC static and share

hello.h

void hello(); 

hello.c

#include <stdio.h>

void hello(){

    printf("hello world\n");

}

main.c

#include <stdio.h>

#include "hello.h"



int main(){

    printf("call hello()");

    hello();

}

 

##############################

Share library

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

gcc main.c -L. -lhello -o main



Q:

./main

./main: error while loading shared libraries: libhello.so: cannot open shared object file: No such file or directory



A:

sudo cp libhello.so /usr/lib/

./main

call hello()hello world



##############################

Static library

gcc -c hello.c -o hello.o



ar -r libhello.a hello.o   # put *.o to *.a. This command like tar.



gcc main.c -lhello -L. -static -o main

./main

call hello()hello world



Reference :

• 
  Linux GCC编译使用动态、静态链接库