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=ham
	autolearn_force=no version=3.4.4
X-Google-Thread: 103376,a88e582de42cdc9b
X-Google-Attributes: gid103376,public,usenet
X-Google-Language: ENGLISH,ASCII
Path: 
 g2news1.google.com!news2.google.com!news.glorb.com!newscon02.news.prodigy.net!prodigy.net!newsfeed-00.mathworks.com!nntp.TheWorld.com!not-for-mail
From: Robert A Duff <bobduff@shell01.TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: Bug in Ada (SuSe 10.2) ?
Date: Wed, 27 Feb 2008 12:49:48 -0500
Organization: The World Public Access UNIX, Brookline, MA
Message-ID: <wcc7igq2ssj.fsf@shell01.TheWorld.com>
References: <0_mdna0iHpIsCifaRVnzvQA@telenor.com>
 <spCdnTyCKpCfvSHaRVnzvQA@telenor.com>
 <3a281192-2744-4110-9fc1-90c155c9436b@d4g2000prg.googlegroups.com>
 <qm_uj.42460$yE1.36921@attbi_s21>
 <48277611-402f-4622-be05-6edddf6dd56a@o10g2000hsf.googlegroups.com>
 <fpigq5$5me$1@jacob-sparre.dk> <gcejpf.ir2.ln@hunter.axlog.fr>
 <624tcvF21i3nvU1@mid.individual.net>
 <2630d99b-1578-4d79-ac9c-64c00c203b77@e60g2000hsh.googlegroups.com>
 <c8a646bf-47b0-43e6-ae46-d5f820126b07@n77g2000hse.googlegroups.com>
 <fpl057$q3q$1@jacob-sparre.dk>
 <69019a65-736e-48ee-bd9f-4c29cd7fc88f@72g2000hsu.googlegroups.com>
 <fpne5k$qab$1@jacob-sparre.dk>
 <d8a465d3-9eae-480b-954f-93236e3a6203@s19g2000prg.googlegroups.com>
 <fpvn0n$l8i$1@jacob-sparre.dk>
 <48a0a0c4-7b79-42dc-b541-7a68693bdd4c@e41g2000hsc.googlegroups.com>
 <wccskzfjjjd.fsf@shell01.TheWorld.com>
 <626c2f0a-d308-437d-888e-0f3ced336f01@f47g2000hsd.googlegroups.com>
NNTP-Posting-Host: shell01.theworld.com
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit
X-Trace: pcls6.std.com 1204134588 10668 192.74.137.71 (27 Feb 2008 17:49:48
 GMT)
X-Complaints-To: abuse@TheWorld.com
NNTP-Posting-Date: Wed, 27 Feb 2008 17:49:48 +0000 (UTC)
User-Agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/21.3 (irix)
Cancel-Lock: sha1:XXn8mUvJkXdMbtYJKwvVIHQAJks=
Xref: g2news1.google.com comp.lang.ada:20129
Date: 2008-02-27T12:49:48-05:00
List-Id: <comp.lang.ada>

billjones6789@yahoo.com writes:

> On Feb 26, 5:05�pm, Robert A Duff <bobd...@shell01.TheWorld.com>
> wrote:
>> Maybe I missed it -- did you or somebody else post an example of a
>> missing accessibility check? �
>
> Yes, here's another copy.  Randy reports a compile-time
> error message, and Bob Klungle reports that the program
> runs without raising program_error.

Ah, thanks for reposting that.

Unless I'm missing something, both compiler behaviors are bugs,
and should be reported.  I would expect a run-time error in WoW,
and there's no compiler switch that's supposed to turn this
check on -- it's supposed to be on by default.

> with Ada.Text_IO;
> procedure Dangling_Pointer2 is
>    type Int_Access is access all integer;
>
>    Save : Int_Access;
>
>    type AirSpeed is record
>       Altitude : aliased integer := 9;
>    end record;
>
>    function WoW (Slats: access AirSpeed) return Int_Access is
>    begin
>       return Slats.Altitude'Access;
>    end WoW;
>
>    procedure Calculate is
>       Heading : aliased AirSpeed;
>    begin
>       Save := WoW (Heading'access);
>       Ada.Text_IO.Put_Line (integer'image(Save.all));
>    end Calculate;
>
>    procedure Mess_with_stack is
>       Dummy: array(1..10) of integer := (others => 17);
>    begin
>       null;
>    end Mess_with_stack;
>
> begin
>    Calculate;
>    Mess_with_stack;
>    Ada.Text_IO.Put_Line (integer'image(Save.all));
> end Dangling_Pointer2;

- Bob