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From: Brian Drummond <brian@shapes.demon.co.uk>
Newsgroups: comp.lang.ada
Subject: Re: How to compile Barnes' examples from his book using GNAT
Date: Sun, 6 Dec 2015 11:24:21 -0000 (UTC)
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On Sun, 06 Dec 2015 02:49:23 -0800, Jerry wrote:

> How does one compile Barnes' examples from his book, Programming in Ada
> 2012, with GNAT? The programs are available here: cambridge.org/barnes
> -> Resources -> Programs.

It should be as simple as "gnatmake main_program.adb".

In fact it isn't ... quite. Taking the first on that list, XPROG6.txt for 
example, I see that it has to be split into .ads files for each package, 
and matching .adb files for each package body and the main program.

Tedious ... except there's a tool called "gnatchop" to do that.

So, 
gnatchop XPROG6.txt
gnatmake tower_of_hanoi.adb

Job done.

-- Brian