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From: jtg <jtg77@poczta.onet.pl>
Newsgroups: comp.lang.ada
Subject: Conditional compilation in Ada?
Date: Tue, 16 Nov 2004 19:30:39 +0100
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Date: 2004-11-16T19:30:39+01:00
List-Id: <comp.lang.ada>

I am using Ada for many years now, but recently
I stumbled upon a problem I cannot solve: I need
some kind of conditional preprocessing, which is
commonly used in C programs:

#ifdef CONDITION
  (some source code)
#else
  (other source code)
#endif

How to achieve it with Ada?
I am developing two applications which are very similar
and share the same source code. The only difference is
a small change in a fundamental data structure. Both versions of the
data structure are mostly handled the same way (within thousands of
lines of source code), but there are some 10 or 20 (number still
growing) places where minor changes are necessary. What is worse,
during the development every several hours I have to prepare
and run both the applications. To do this, I have to perform
"human preprocessing": find those places, comment lines
for app1, and uncomment lines for app2. This is very error prone and
I have already made a mistake.

Any hints?