compilation and linking

Compilation occurs in two phases:

• Compilation: the process of turning the C source into low-level binary or "object" code.
• Linking: the process of combining multiple object files into a single executable, adjusting references so accessing variables or functions in other files works correctly.

root@selvakumar-Lenovo-B460e:/C_pgms/static-func# cat one.c two.c 

void fun()

{

printf("\nfun\n");

}

#include<stdio.h>

int main()

{

fun();

return 0;

}

root@selvakumar-Lenovo-B460e:/C_pgms/static-func# gcc -c one.c two.c 

one.c: In function ‘fun’:

one.c:3:2: warning: incompatible implicit declaration of built-in function ‘printf’ [enabled by default]

root@selvakumar-Lenovo-B460e:/C_pgms/static-func# gcc -o output one.o two.o

root@selvakumar-Lenovo-B460e:/C_pgms/static-func# ./output 

fun

root@selvakumar-Lenovo-B460e:/C_pgms/static-func#