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=-1.8 required=5.0 tests=BAYES_00,PLING_QUERY
	autolearn=no autolearn_force=no version=3.4.4
X-Google-Thread: 103376,345cecbee95ca646
X-Google-NewGroupId: yes
X-Google-Attributes: gida07f3367d7,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
X-Received: by 10.180.19.132 with SMTP id f4mr2215105wie.2.1363001204730;
        Mon, 11 Mar 2013 04:26:44 -0700 (PDT)
Path: 
 bp2ni85591wib.1!nntp.google.com!feeder1-2.proxad.net!proxad.net!feeder1-1.proxad.net!ecngs!feeder2.ecngs.de!newsfeed.freenet.ag!takemy.news.telefonica.de!telefonica.de!newsfeed.arcor.de!newsspool3.arcor-online.net!news.arcor.de.POSTED!not-for-mail
Date: Mon, 11 Mar 2013 12:26:35 +0100
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7;
 rv:17.0) Gecko/20130216 Thunderbird/17.0.3
MIME-Version: 1.0
Newsgroups: comp.lang.ada
Subject: Re: Bootstrapping a null procedure. Seriously?!
References: <19d330ec-9b61-414e-abc3-e25a8c786b81@googlegroups.com>
In-Reply-To: <19d330ec-9b61-414e-abc3-e25a8c786b81@googlegroups.com>
Message-ID: <513dbf68$0$6580$9b4e6d93@newsspool3.arcor-online.net>
Organization: Arcor
NNTP-Posting-Date: 11 Mar 2013 12:26:32 CET
NNTP-Posting-Host: 1fd46b76.newsspool3.arcor-online.net
X-Trace: 
 DXC=EB\8Xfh5CR0kUFX=Y?aLP;McF=Q^Z^V384Fo<]lROoR18kF<OcfhCO;lmQ:I4Z0CP9nc\616M64>:Lh>_cHTX3j=6ZJDfO1;dF<
X-Complaints-To: usenet-abuse@arcor.de
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Date: 2013-03-11T12:26:32+01:00
List-Id: <comp.lang.ada>

On 11.03.13 11:37, Diogenes wrote:
> I've been doing some binder experiments with this little gem....
>
> procedure nullmain is

> Been doing it to see just how many packages from the runtime have to be linked in order for the the thing to DO NOTHING!

> Tips?

Compilers may let you choose run-time systems.
With GNAT, look up --RTS, pragma No_Run_Time,
Configurable Runtime, and related documentation.

A program nullmain is quite rare; I'd therefore not expect
special circuitry to be built into the compiler for just
this null program. Rather, a run-time system of an
Ada compiler supports full Ada programs by default,
including tasking and exceptions. See below, and above.

The program nullmain doesn't actually do nothing.
For a start, you can run the resulting executable,
This creates a state change in your computer.
OK, this may be nitpicking.

Nullmain is, however, going to run as required by Ada,
and as a rule of thumb, every statement can raise
storage error, which might well be what an author
of a null program wishes to happen, for testing, say.

Nullmain will be running as part of the environment task,
as expected.

Nullmain may also be just a partition of a program, for some
reason however likely or unlikely. Etc.

That's the default. Choose a smaller run-time and
add configuration pragmas as needed, if you need to.