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From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: Crosspost: Help wanted from comp.compilers
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> 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.
  If A 'with's B and something new is added to B's spec, how does a
compiler know that the new thing is not used by A, unless it recompiles A?