From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on
	ip-172-31-74-118.ec2.internal
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: eternal-september.org!reader01.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED.2uCIJahv+a4XEBqttj5Vkw.user.gioia.aioe.org!not-for-mail
From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Checking for OS in gnatstudio project file(.gpr)
Date: Thu, 18 Jun 2020 14:13:26 +0200
Organization: Aioe.org NNTP Server
Message-ID: <rcflp4$17r1$1@gioia.aioe.org>
References: <5eeb50d9$0$1208$e4fe514c@news.kpn.nl>
NNTP-Posting-Host: 2uCIJahv+a4XEBqttj5Vkw.user.gioia.aioe.org
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 8bit
X-Complaints-To: abuse@aioe.org
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101
 Thunderbird/68.9.0
X-Notice: Filtered by postfilter v. 0.9.2
Content-Language: en-US
Xref: reader01.eternal-september.org comp.lang.ada:59121
List-Id: <comp.lang.ada>

On 18/06/2020 13:32, ldries46 wrote:
> I em in neede for a possibility to check within a .gpr file which 
> operating system is runnung. Is there a way to do that? So I can use the 
> same project file without changing  the .gpr file when compiling a 
> program on different OS'ses.

Well, it is a sad story.

Actually there is Project'Target which should give you Linux-esque 
triplet containing architecture and OS. [Isn't it obvious that you need 
three fields for two things?]

Unfortunately it does not work. Sometimes (most of the times?) it is empty.

And even if it worked GRP has no means to split a triplet into parts 
because it has no string indexing. So you will end up with a long case like:

    Target_Triplet := Project'Target;

    case Target_Triplet is
       when "aarch64-linux-gnu" =>
       when "arm-linux" =>
       when "arm-linux-gnueabi" =>
       when "arm-linux-gnueabihf" =>
       when "x86_64-apple-darwin" =>
       when "x86_64-freebsd" =>

and so on.

So you will be better on with a scenario variable.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de