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Date: Thu, 5 Oct 2017 11:35:58 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: Don Lewis <truckman@FreeBSD.org>
Cc: sgk@troutmask.apl.washington.edu, linimon@lonesome.com, list1@gjunka.com, 
 freebsd-ports@freebsd.org
Subject: Re: portmaster, portupgrade, etc
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On Wed, Oct 04, 2017 at 05:27:11PM -0700, Don Lewis wrote:
> > The system in question is my last i686 laptop, which I 
> > use for libm development and testing.  Once I cannot use
> > that laptop (whether hardware failure or inability to 
> > update the installed ports), I'll stop worrying about a
> > functional libm on 32-bit hardware.
> 
> As an aside, this sort of thing could be done in an i386 VM or maybe an
> i386 jail on amd64 hardware.

You do not need even a jail for this. Base cc -m32 works on amd64 for
long time, and 32bit binaries can be executed from host environment,
assuming all third-party libs are provided somewhere in the 32bit
variant.

The environment with regard to the hardware configuration should be
identical to modern i386-arch machine with SSE2.  Incompatibilities are
considered as bugs and are usually fixed fast when reported.