From owner-freebsd-questions@FreeBSD.ORG  Mon Oct 28 09:28:24 2013
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTP id C3EA6818
 for <freebsd-questions@freebsd.org>; Mon, 28 Oct 2013 09:28:24 +0000 (UTC)
 (envelope-from jbirch@jbirch.net)
Received: from mail-oa0-f43.google.com (mail-oa0-f43.google.com
 [209.85.219.43])
 (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits))
 (No client certificate requested)
 by mx1.freebsd.org (Postfix) with ESMTPS id 8D3C92E34
 for <freebsd-questions@freebsd.org>; Mon, 28 Oct 2013 09:28:24 +0000 (UTC)
Received: by mail-oa0-f43.google.com with SMTP id m1so3301699oag.16
 for <freebsd-questions@freebsd.org>; Mon, 28 Oct 2013 02:28:18 -0700 (PDT)
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20130820;
 h=x-gm-message-state:mime-version:in-reply-to:references:date
 :message-id:subject:from:to:cc:content-type;
 bh=Z0ZrPCc5PJatc6RnrcEToN1Gcjww5dTNAKA0lHEPsk4=;
 b=N7TT5jjVQVEfq8Moa6+bH3SWT+sTkHcPj+ZbPhqCzwTzg/OUycgdR4QS+mumyKVLWn
 G/Ziw7ySw8TjOvha1tN8yQSfJGgrTcKMN3kb1JHZlni7yWXmZf+Q/L2LEQbiRZ5hQZVd
 CBItYug6JxOib91xvvo61ms3Jnj+TGZsFDMHJ1u0rxG20jpZ3Wf1Xik7GWZYJX2Z/YcO
 TZYTnFetK9kMyj2ATFy0v9PGicasugxaFoaq/TVvAHQK/nhnNAYtsIhRyg4l60m3bccJ
 gm1ekC9BRjM1dOVK70ii/964ELZfFR7Sgwlbqk4XbqL5DXUnyseDwyJw2unZdQNFIi2R
 0CoA==
X-Gm-Message-State: ALoCoQmHgPDsdXlgQ3IBJNt9eZeAheDs6649+qlDoUnFPbpMNe8sxgxIErvFv17ZAYG0qhlMwc34
MIME-Version: 1.0
X-Received: by 10.182.49.166 with SMTP id v6mr13936750obn.13.1382952135884;
 Mon, 28 Oct 2013 02:22:15 -0700 (PDT)
Received: by 10.182.185.71 with HTTP; Mon, 28 Oct 2013 02:22:15 -0700 (PDT)
X-Originating-IP: [49.180.138.218]
In-Reply-To: <526C3716.4000802@infracaninophile.co.uk>
References: <CAA=KUht4Kyz=-J6yGJdPfO4Bnr0a8-qU8k_Aj2Gp0MKjjPM=Qw@mail.gmail.com>
 <526C3716.4000802@infracaninophile.co.uk>
Date: Mon, 28 Oct 2013 20:22:15 +1100
Message-ID: <CAA=KUhuLQafyhhmw6LbxYuiQoBC=NiTLFB0mrPZV4bxd9qAqjA@mail.gmail.com>
Subject: Re: Kernel/World/Ports compilation within jails;
 targeting many platforms.
From: Jason Birch <jbirch@jbirch.net>
To: Matthew Seaman <m.seaman@infracaninophile.co.uk>
Content-Type: text/plain; charset=ISO-8859-1
X-Content-Filtered-By: Mailman/MimeDel 2.1.14
Cc: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 28 Oct 2013 09:28:24 -0000

> For your case, 11-CURRENT/armv7 isn't going to work on
> 9.1-RELEASE/amd64.  Your best bet would be some sort of VM where you
> could emulate an armv7 CPU, if such a thing exists and is usable for
> your intended purpose.
>

I wouldn't be attempting to run these compiled armv7 ports in the jail,
however. Simply cross-compiling them for transplanting into another system.
I'd like to be able to do this for convenience, but I think I may settle
into building things on each system -- it may be slower, but it'll allow me
to help contribute to weeding out problems with completely self-hosted
systems -- the time spent compiling is the least I can do to contribute.

Thanks for the detailed response -- I appreciate the insight into the
limitations of jails and why it's probably not appropriate for what I'm
trying to accomplish.