c language creates dynamic library .a in linux

Create source code

1. input source code

a) [projectFolder]/src/header/hello.h

#ifndef HELLO_H
#define HELLO_H

void hello(const char *name);

#endif

b) [projectFolder]/src/hello.c

#include

void hello(const char *name) {
    printf("hello %s!\n", name);
}

2. compile library source code to object file

cd [projectFolder]
 gcc -c -fPIC src/hello.c -o debug/hello.o

3. package object files to dynamic library

 gcc -shared -fPIC -o bin/libhello.so debug/hello.o

Using dynamic library 

1. input source code

a) [projectFolder]/src/main.c

#include "hello.h"

int main(void) {

    hello("everyone");

    return 0;

}

2. copy header files *.h to [projectFolder]/src/header

3. copy dynamic library libhello.so to [projectFolder]/dlib

4. compile source code with header files and dynamic libraries .so

 gcc -o bin/hello src/main.c -I./src/header -L./dlib -lhello

5. run program

cp [projectFolder]/dlib/libhello.so /usr/lib

./bin/hello