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,FREEMAIL_FROM
	autolearn=ham autolearn_force=no version=3.4.4
X-Google-Thread: 103376,c4ba91f4ae36a2c
X-Google-NewGroupId: yes
X-Google-Attributes: gida07f3367d7,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII
Path: 
 g2news2.google.com!postnews.google.com!l2g2000vbn.googlegroups.com!not-for-mail
From: AdaMagica <christ-usch.grein@t-online.de>
Newsgroups: comp.lang.ada
Subject: Re: Elaborate_All on child package
Date: Sun, 4 Sep 2011 22:21:58 -0700 (PDT)
Organization: http://groups.google.com
Message-ID: <c97951be-ca0a-4cac-9212-caf56d16dfad@l2g2000vbn.googlegroups.com>
References: 
 <19a85f93-3cd2-4054-8022-21ba294d53e3@glegroupsg2000goo.googlegroups.com>
NNTP-Posting-Host: 80.156.44.178
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
X-Trace: posting.google.com 1315200499 19778 127.0.0.1 (5 Sep 2011 05:28:19
 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Mon, 5 Sep 2011 05:28:19 +0000 (UTC)
Complaints-To: groups-abuse@google.com
Injection-Info: l2g2000vbn.googlegroups.com; posting-host=80.156.44.178;
 posting-account=rmHyLAoAAADSQmMWJF0a_815Fdd96RDf
User-Agent: G2/1.0
X-Google-Web-Client: true
X-Google-Header-Order: HUALESRCNK
X-HTTP-UserAgent: Mozilla/5.0 (Windows NT 5.2; WOW64;
 rv:5.0) Gecko/20100101 Firefox/5.0,gzip(gfe)
Xref: g2news2.google.com comp.lang.ada:21816
Date: 2011-09-04T22:21:58-07:00
List-Id: <comp.lang.ada>

On 3 Sep., 18:57, "Rego, P." <pvr...@gmail.com> wrote:
> However, should it be done this way? Due to it is already "withed" to the=
 parent package, so why have I make a new with? I mean: why is the followin=
g code incorrect:
> =A0 =A0pragma Elaborate_All (Forum_Test);
> =A0 =A0package Forum_Test.Childp is <....>
>
> and why is the following code correct?
> =A0 =A0with Forum_Test;
> =A0 =A0pragma Elaborate_All (Forum_Test);
> =A0 =A0package Forum_Test.Childp is <....>

The simple (and unsatisfying) answer: Because the RM says so.

So your problem is based on lack of understanding of elaboration. A
program begins execution by elaborating all compilation units. There
is no order prescribed for this except that what is mentioned in a
context clause must be elaborated before.

So applied to your example, elaboration order can be:

1. Forum_Test'Spec
2. Forum_Test'Body
3. Forum_Test.Childp'Spec
With this sequence, your program would have worked. However your
compiler, GNAT, chose another sequence:

1. Forum_Test'Spec
2. Forum_Test.Childp'Spec
3. Forum_Test'Body
When Childp calls Construct, you get an elaboration check that fails.

There are several ways to force certain elaboration orders. One is to
use pragma Elaborate_Body in every spec whenever the spec defines a
function - this forces the body to be elaborated directly after the
spec. Sometimes, this is not possible.

Other pragmas are Preelaborate, Elaborate_All, Elaborate, Pure. See RM
10.2.1 Elaboration Control.