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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Ada  "library only" compiler ?
Date: Sat, 21 Jul 2012 20:22:10 +0100
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Date: 2012-07-21T20:22:10+01:00
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Patrick <patrick@spellingbeewinnars.org> writes:

> Right now I don't know where the runtimes live or even what language
> they are written in. I don't know how they act on bare metal or with
> an OS.

You might find this (somewhat old, being based on GNAT 3.15p) document
helpful to give you a flavour.

http://www.iuma.ulpgc.es/users/jmiranda/gnat-rts/gnat-rts.pdf