Thread: C Makefile Help needed

Hello,

I have a C code of about 5 files.
main.c & main.h
typeA.c & typeA.h
typeB.c & typeB.h

The problem is that I have to make a makefile that compiles for typeA or typeB but not both.
A further complication is that I can have typeB compiled for either N (a variable in code ) = 10 or = 56 (This controls the number of decimal places the code works into ).
I need to encapsulate all this in a single makefile and as I am a n00b , need help here.

Anything that points me in correct direction is much appreciated.

Thanks,
Ace

I am probably a wimp, but I might make three targets, if I knew that N could only ever be 10 or 56 (and not anything in between). You can use -D N=10 or -D N=56 flags for the B cases (assuming gcc), and the A case would just be its own thing.

Originally Posted by MasteAceVentura

The problem is that I have to make a makefile that compiles for typeA or typeB but not both.

Okay, so make those two targets. It's not going to build both unless you make it happen.

A further complication is that I can have typeB compiled for either N (a variable in code ) = 10 or = 56 (This controls the number of decimal places the code works into ).

In your code, you will need to initialize this variable N like so:

Code:

#ifndef N_INITIAL_VALUE
#define N_INITIAL_VALUE 10
#endif
int N = N_INITIAL_VALUE;

Then in your makefile you must add -DN_INITIAL_VALUE=10 or -DN_INITIAL_VALUE=56 to the CFLAGS.