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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Misleading Compiler Warning
Date: 03 Feb 2003 06:45:37 +0000
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volkert@nivoba.de (Volkert) writes:

> The snippet is reproduced from a large application we currenty
> bringing from DEC Ada 83 to GNAT (OpenVMS).... the GNAT 3.16w 
> gives a Compiler-Warning whereas the DEC Compiler keeps silent. 
> 
> % gnat make wmain.adc
> gcc -c -x ada wmain.adc
> gcc -c -x ada pack.adc
> pack.adc:9:03: warning: in instantiation at Gen.adc:4
> pack.adc:9:03: warning: value not in range of type "Standard.Integer"
> pack.adc:9:03: warning: "Constraint_Error" will be raised at run time
> gnatbind -x wmain.ali
> gnatlink wmain.ali
> 
> The example runs on both compilers without raising a Constraint_Error.
> 
> Is it just a misleading warning message ... if so, i send a
> bug-report to act.

I'm sure this is a bad warning -- if only because there is nothing in
the regenerated code (-gnatdg) about constraint errors.

It also happens on Saturday's experimental GCC-3.4.

If you have 3.16w, you should be supported -- ACT are very quick to
respond to reports like this, IME, don't hold back!