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=-1.1 required=5.0 tests=BAYES_00,
	PP_MIME_FAKE_ASCII_TEXT autolearn=no autolearn_force=no version=3.4.4
X-Google-Thread: 103376,235855e3822c83d1
X-Google-NewGroupId: yes
X-Google-Attributes: gida07f3367d7,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII
Received: by 10.68.125.233 with SMTP id mt9mr75086pbb.5.1334263640324;
        Thu, 12 Apr 2012 13:47:20 -0700 (PDT)
MIME-Version: 1.0
Path: 
 r9ni49010pbh.0!nntp.google.com!news2.google.com!npeer02.iad.highwinds-media.com!news.highwinds-media.com!feed-me.highwinds-media.com!nx01.iad01.newshosting.com!newshosting.com!news2.euro.net!newsfeed.x-privat.org!news.jacob-sparre.dk!munin.jacob-sparre.dk!pnx.dk!.POSTED!not-for-mail
From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Importing C function with variable argument list
Date: Thu, 12 Apr 2012 15:47:14 -0500
Organization: Jacob Sparre Andersen Research & Innovation
Message-ID: <jm7f0m$ugp$1@munin.nbi.dk>
References: 
 <610ee323-4c7f-413d-8568-aed4955f5152@z38g2000vbu.googlegroups.com>
 <jm1bug$2dp$1@speranza.aioe.org> <m2zkajfs9d.fsf@pushface.org>
 <jm69iq$vjc$1@speranza.aioe.org>
 <1288794.275.1334249936588.JavaMail.geo-discussion-forums@ynlp2>
NNTP-Posting-Host: static-69-95-181-76.mad.choiceone.net
X-Trace: munin.nbi.dk 1334263638 31257 69.95.181.76 (12 Apr 2012 20:47:18 GMT)
X-Complaints-To: news@jacob-sparre.dk
NNTP-Posting-Date: Thu, 12 Apr 2012 20:47:18 +0000 (UTC)
X-Priority: 3
X-MSMail-Priority: Normal
X-Newsreader: Microsoft Outlook Express 6.00.2900.5931
X-RFC2646: Format=Flowed; Original
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157
X-Received-Bytes: 2193
Date: 2012-04-12T15:47:14-05:00
List-Id: <comp.lang.ada>

"Adam Beneschan" <adam@irvine.com> wrote in message 
news:1288794.275.1334249936588.JavaMail.geo-discussion-forums@ynlp2...
On Thursday, April 12, 2012 3:08:28 AM UTC-7, Markus Sch�pflin wrote:
...
>> So the note from the Ada RM does not seem to be followed by GNAT
>
>I don't think GNAT has a choice whether to follow it or not, since GNAT 
>can't be expected
> to know what the code of the imported C subprogram is going to look like. 
> All it can do is
> obey what the user tells it to do.

Right. If the calling convention is different for normal C subprograms and 
vararg ones, then clearly there needs to be a different convention name for 
varargs. (As I noted, I've never worked on such a machine, but it doesn't 
surprise me that much that they exist.)

Probably the RM ought to suggest such a convention name as Implementation 
Advice (something like C_Varargs) in order to increase portability.

Someone ought to submit a suggestion to Ada-Comment so that it gets on the 
ARG's radar/agenda.

                                 Randy.