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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Last stream problem: byte order
Date: 28 Mar 2002 18:38:48 +0000
Organization: Pushface
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References: <mailman.1017085322.10332.comp.lang.ada@ada.eu.org>
 <3CA04CA6.338B37D7@ib-paus.com>
 <mailman.1017243242.6790.comp.lang.ada@ada.eu.org>
 <3CA20BAA.FD53C08A@ib-paus.com>
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Date: 2002-03-28T18:38:48+00:00
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"Eric G. Miller" <egm2@jps-nospam.net> writes:

> In <3CA20BAA.FD53C08A@ib-paus.com>, Dr. Michael Paus wrote:

> >       if System.Default_Bit_Order = System.Low_Order_First then
> >          ... (swap the bytes)
> >       else
> >          ... (don't swap the bytes)
> >       end if;
> > 
> > But I don't think this makes a big difference in either case.
> 
> GNAT gives a warning that the condition is always true (or false).
> Don't know if it eliminates the unreachable branch (I would think so
> with -02).  Resorting to preprocessing trickery would probably
> insure it is always a compile time check.  Don't know if there's
> another way...

I've just tried a similar code with 3.13p, 3,14a1 and 3.15a and none
of them flagged a warning here .. with or without -O2.

You can use -gnatG to see the tree from which code is generated.