CS 1206: Assignment 4

Due Friday, March 6 by 5pm

100 Points

Writing A Makefile

Your assignment is to write a Makefile for a C program. The program is called ``flip''--a program that converts the line-ending characters on plain text files from MS-DOS conventions (CR-LF pairs) to Unix conventions (LF only) and vice versa.

The source files for flip are available in the tar file assign4.tar on ei.cs.vt.edu. The source files are:

flip.1
flip.c
flip.h
getopt.c

The Details of Your Makefile

Make sure you start off your makefile with a section of comments that describe its purpose and who wrote it. Then include target directives for every derived file produced during the compilation process (i.e., each program, each object file, and any other intermediate files produced during compilation). Make sure that each directive also lists all files that the derived file depends on in its dependency list.

The basic steps in compiling flip are:

gcc -DBSD -DNDEBUG -O -c flip.c
gcc -DBSD -DNDEBUG -O -c getopt.c
gcc -s -o flip flip.o getopt.o

In addition, your makefile should be written so that ``make man'' carries out the following commands:

nroff -man flip.1 > flip.man

Finally, your makefile should be written so that when make is invoked with no target specified on the command line, it carries out both sets of commands listed above, bringing everything (both the program and its formatted man page) up to date.

In your makefile, use descriptive comments to clarify your intentions whereever necessary.

Submitting Your Answers

You are to hand in your assignment by sending an email message to the address cs1206@ei.cs.vt.edu. To receive credit, your mail message must be received by this account by the time and date listed above. It is your responsibility to successfully submit your assignment via email (remember that you will receive an auto-reply by the system when your message has been received successfully). Also, send yourself a copy for future reference. The messsage must be a plain ASCII text file, with no attachments, and in exactly the format defined below. Do not insert any extra notes or explanations.

The body of your message must be a plain ASCII text file that contains the following:

• A subject line containing "DHH HW4", which indicates your lab section. Here, the D should be replaced by the day of your lab section (M for Monday, T for Tuesday, W for Wednesday, H for Thursday, and F for Friday), and HH should be replaced by the time of your lab section (8, 9, 10, or 11). If you do not include your lab section information in your subject line, you will lose points.
• Your PID.
• Your name.
• Your student ID number.
• The Makefile you wrote.