From mboxrd@z Thu Jan  1 00:00:00 1970
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From: Stephen Leake <Stephen.Leake@gsfc.nasa.gov>
Subject: Re: Derivation + Access Discriminant = Headaches
Date: 1999/03/19
Message-ID: <uaex9ntd8.fsf@gsfc.nasa.gov>#1/1
X-Deja-AN: 456617392
References: <m3r9qlvpuv.fsf@mheaney.ni.net>
 <7cu23r$miu@dfw-ixnews5.ix.netcom.com> <m3zp591hq6.fsf@mheaney.ni.net>
Organization: NASA Goddard Space Flight Center -- Greenbelt, Maryland USA
Newsgroups: comp.lang.ada
Date: 1999-03-19T00:00:00+00:00
List-Id: <comp.lang.ada>

Matthew Heaney <matthew_heaney@acm.org> writes:

> Richard D Riehle <laoXhai@ix.netcom.com> writes:
> 
> >  On GNAT, an equivalent type hierarchy works fine.  
> 
> Which version of GNAT are you using?  On what OS?  On what machine?  
> 
> I'm having this problem using a home-grown port of v3.11p, so it may be
> a porting problem.

I compiled Matthew's code with GNAT 3.11p on Windows NT (the public
binary distribution) and got the error :

q.ads:4:14: subtype must be compatible with parent discriminant
gnatmake: "q.ads" compilation error

ObjectAda (same machine) gives no error.

I suspect GNAT has a compiler bug; I'll let Matthew submit it.

-- Stephe