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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: CPAN style Ada repository
Date: Tue, 3 Dec 2013 13:03:50 -0600
Organization: Jacob Sparre Andersen Research & Innovation
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Date: 2013-12-03T13:03:50-06:00
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"Georg Bauhaus" <rm.dash-bauhaus@futureapps.de> wrote in message 
news:529911e9$0$6625$9b4e6d93@newsspool2.arcor-online.net...
...
> Are there other typical causes that render Ada code non-portable
> between Ada compilers? Compiler bugs I suppose, but these cannot
> always be addressed by changing the source.

With GNAT code, there is often (lazy, IMHO) use of 'Unrestricted_Access. And 
of course, lots of people use various GNAT library packages which have to be 
replaced by something else in order to port.

For Janus/Ada to GNAT, it's mostly library dependence, and as you say, 
compiler bugs. (The worst ones being where the compiler allowed something 
that shouldn't have been legal, those are often painful to remove.)

                                                Randy.