$(14$ points$)$

There are three source files sender$.$c$,$ receiver.c$,$ and commlib.c$.$ The files sender$.$c while

and commlib.c are compiled and linked together to build the executable file send to the exe$-$

cutable file receiver. Write a makefile so a user can just type make to build the sender

and the receiver executable files.

$C=gCC$

CFLAGS$=-g$

I ALAGS $=-i$

all: Senders reciever

Sender: Sender. $0$ commlib. $0$

$$\{cc\}-O$ Sender Sender.$o$ commlib.$o$

reciever: Heciever. o commib. o

$$\{cc\}-0$ recievon reciever. Commitio

clean: rm racievor, Sender, reciever.o$,$ Scinder. o$,$ commlto o

makederndS$\{$ I FLAGSS Senden.o commit. O

makedepand & IfLAGS Gecieus. $0$ commbib. $0$

Assume that after building the sender and the receiver executable files, we modify the

file sender$.$c$.$ Then we type make again. What will you see on the screen $($i$.$e$.$ the compil$-$

ing$/$linking commands executed$)?$

If modified and rein again the 'make' command

only the Scnder.c$,$ commbibic well compiled

and linked toguther., $gcc-c$ Sender. $c$

on the squeen

to$.$mmlib.s$.$

$11$

gec $-$o Sender Sendor.o Commlib.o