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=unavailable autolearn_force=no version=3.4.4
Path: 
 eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Gprbuild - Setting the earliest version of MacOS X that an
 executable will run on.
Date: Mon, 27 Mar 2017 08:26:00 +0100
Organization: A noiseless patient Spider
Message-ID: <ly60ivch9z.fsf@pushface.org>
References: <ce651ca0-316d-4955-b01f-2c94526786c8@googlegroups.com>
	<lymvc7diim.fsf@pushface.org> <lyinmvda4a.fsf@pushface.org>
	<6f8cefdc-9f22-43ef-97fc-5835d9376bc1@googlegroups.com>
Mime-Version: 1.0
Content-Type: text/plain
Injection-Info: mx02.eternal-september.org;
 posting-host="2c4d1ae3dfa75454e139cc23729edbbe";
	logging-data="3548"; mail-complaints-to="abuse@eternal-september.org";
	posting-account="U2FsdGVkX19onAz4iMwxjtbnHBBdlCvUBL0arD8BHA8="
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (darwin)
Cancel-Lock: sha1:x5hgO5W2ZXzEkrZkaitCXkk3Klg=
	sha1:fnD93fENDLxCIQ/CEQUD3nOhafY=
Xref: news.eternal-september.org comp.lang.ada:46485
Date: 2017-03-27T08:26:00+01:00
List-Id: <comp.lang.ada>

ahlan.marriott@gmail.com writes:

> However I don't understand you proposed workaround to the linker.
> "-Wl,-macosx_version_min,'sw_vers -productVersion'"
> When I try this Gnat says
> -macosx_version_min value malformed: 'sw_vers -productVersion'

Those were *backticks*, and the workround would need to be applied on
the command line (since gprbuild can't execute arbitrary shell commands
internally).

If you say

   gprbuild -P foo -largs -Wl,-macosx_version_min,`sw_vers -productVersion`

under a Unix-type sh-like shell (e.g. bash), the shell will execute the
part in backticks and substitute the result (in this case, 10.12.3) in
the command line actually passed to gprbuild.

I suppose you could set up an environment variable

   export OS_VER=`sw_vers -productVersion`

and use 'case' magic inside your GPR.