You are suppose to know how to write a Makefile
already. If you don't, you should learn it as soon as
possible because your Makefile must work in all
your submissions. There are a few tutorials on
make on the web. Here are links to some of them.
I have not really read through these pages so I cannot
guarantee their correctness.
Please be aware that if you transfer a Makefile from a Windows
environment to a UNIX environment, chances are, it will not work.
The reason is that a line in a text file in Windows ends with "\r\n"
while a line in a text file in UNIX ends with just "\n". The extra
"\r" can confuse make on UNIX machines. But I'm sure you can
write a small program to fix that.
Compiling Your Code
If you are writing your program in C, you should use gcc
as your compiler, rather than cc. Gcc supports
function prototypes and other ANSI extensions, which you should
use in your programs.
The option -Wall turns on most of the useful
Compiling with this option will find many simple mistakes in your programs.
On many platforms you also need to link the network and socket
libraries to your program.
We will evaluate your submission by copying all the files you have
submitted into an empty directory and then type the following command:
(If an individual homework spec has more specific way of producing
executables, you must follow it.) Minor variation (such as using
gmake) is allowed, but you must describe in details how
to compile your code near the top of your README file.
Requiring a visual tool to compile your code is not allowed.
You may lose quite a few points if the grader has to debug and
modify your Makefile in order to get your code to compile.
How many points you will lose depends on
how hard it is for the grader to get your Makefile to work.
You may even receive a score of zero if we cannot get your
Makefile to work.
Here are some additional requirements:
- You are required to use
to compile your source code. You must divide your source code into
separate source files in a logical way.
Even if everything can fit in a single source file, you must
force yourself to cut it up or you will lose a lot of points!
- You must not put the bulk of your code in header files!
Header files are not where you are suppose to put your source code
because you will lose the ability to debug your code.
- When the following command is invoked at the UNIX prompt:
all binary files created during compilation
(.o files and executable files) must be removed.
- You must use -Wall (or equivalent) in your Makefile
when you compile with gcc/g++ and you must eliminate
all compile-time warning messages.
The README file you submit should include the following:
You do not have to repeat anything from the spec in your
README file. But if you want to (so that you have a self-contained
document), please mark it clearly so the grader can easily skip such
- Any design decisions you made that is not in the spec.
- Known bugs (not required, but it's nice to have so the grader knows
what to expect).
- Any deviation from the spec (e.g., minor variation on "make" may
not lost points, minor variation on others may lose points).
- References and credits (e.g., you use some code you find on a web site).
How do you make sure that make would work? It's actually
- Create a Makefile first time you need to compile your code.
Don't wait till the last minute.
- If you do your development on Windows and expect your code to
just compile and run on nunki.usc.edu,
you will soon find out
how unrealistic your assumption is. I would leave at least
2 days for porting for small programming assignments and 5 days for
porting large ones.
- Write a rule in your Makefile to generate a submittable
file in the right format. Do this early! You can also think of
this as generating a backup copy of what you have done so far.
Copy the backup copy to another place in case you accidentically
erase all your files.
- Testing! Verify your submissions.
Create an empty directory on nunki.usc.edu,
unpack your test submission, and type make in it!
If it doesn't work, fix it right away.
- Have a working copy ready for submission. When it's 2 hours away
from the deadline and your code is not completing working, you
should probably consider doing the following.
- Fix your code so that it compiles and runs.
- Create a submission from your working code and keep it as
a backup in case you can't fix your bugs when deadline comes.
- Repeat this as you fix more bugs.