Preprocessing Ada

[David Starner <dstarner98@aasaa.ofe.org>]

I'm writing a library in Ada and I've hit a couple things where I would
use #ifdef's in C. I would like to offer alternate algorithims for the
same function that can be chosen at compile time. I would also like to
add an expensive verification call to the front of each function that
can be turned on and off at compile time (expensive enough that I want
it to be seperate from Pragma Assert.)

1. Is there a more 'Ada'-like way to do this?

2. Will cpp (the C pre-processor) work cleanly with Ada?

3. Is there a DFSG-free preprocessor for Ada? (I hate to go this way,
because that means that everyone who compiles the program needs a
special preprocessor.)