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From: Kilgallen@SpamCop.net (Larry Kilgallen)
Newsgroups: comp.lang.ada
Subject: Re: Crosspost: Help wanted from comp.compilers
Date: 17 Jul 2003 09:10:55 -0500
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In article <u2rRa.80496$Ph3.9622@sccrnsc04>, tmoran@acm.org writes:

>   BTW, I recall as one of the nicest things about my first Ada compiler,
> Janus (long before Gnat), was that it didn't need a "make" or special
> library database.  Just like gnatmake, it looked at the files on disk
> and recompiled just what was necessary.

Just looking at files on disk does not give any history as to whether
a given _declaration_ within a file has changed.  One might end up
recompiling a cascading tree of modules because some entirely unused
(yet) declaration was added to a module.