From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00
	autolearn=unavailable autolearn_force=no version=3.4.4
Path: 
 border1.nntp.dca3.giganews.com!border3.nntp.dca.giganews.com!border1.nntp.dca.giganews.com!nntp.giganews.com!goblin2!goblin.stu.neva.ru!feeder.erje.net!eu.feeder.erje.net!eternal-september.org!feeder.eternal-september.org!mx05.eternal-september.org!.POSTED!not-for-mail
From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Range check for type 'Integer'
Date: Mon, 17 Jun 2013 12:54:02 +0100
Organization: A noiseless patient Spider
Message-ID: <lywqptkl5x.fsf@pushface.org>
References: 
 <7f33982d-3bcf-452e-a3b3-3a0a28505ff1@x20g2000vbe.googlegroups.com>
 <kpmrjl$eps$1@dont-email.me>
Mime-Version: 1.0
Content-Type: text/plain
Injection-Info: mx05.eternal-september.org;
 posting-host="b69de8604a6c4b9f4a8de618679474df";
 logging-data="24816"; mail-complaints-to="abuse@eternal-september.org";
 posting-account="U2FsdGVkX18X7D6pxfjjGke1cyCeFAWvzOgqXaLuc8A="
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (darwin)
Cancel-Lock: sha1:R4VDmu1Wzqgf37cfDXzLDrQJdGI=
 sha1:yegIX+tyIyS281A/a71g83ng3LI=
X-Original-Bytes: 1803
Xref: number.nntp.dca.giganews.com comp.lang.ada:181884
Date: 2013-06-17T12:54:02+01:00
List-Id: <comp.lang.ada>

Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> writes:

> On 2013-06-17, Peter Brooks <peter.h.m.brooks@gmail.com> wrote:
>>
>> So the 'Integer' has rolled over to negative and then rolled back to
>> 0 - but with no run-time error.
>>
>> Why is there no range check error on type Integer?
>
> Because GNAT does not enable integer overflow detection by default;
> this is a design decision which was a major mistake. You need to
> compile your program using the switch to enable integer overflow
> detection.
>
> BTW, this same program was posted a few days ago with the same problem
> description. Is this a problem posed as part of a class you are taking
> ?

And, as stated before, compile with -gnato to enable integer overflow
detection.