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Date:      Tue, 15 Oct 2019 21:41:52 +0000
From:      Brooks Davis <brooks@freebsd.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   Re: svn commit: r353597 - head/share/mk
Message-ID:  <20191015214152.GC49245@spindle.one-eyed-alien.net>
In-Reply-To: <201910152127.x9FLR7rV061089@repo.freebsd.org>
References:  <201910152127.x9FLR7rV061089@repo.freebsd.org>

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On Tue, Oct 15, 2019 at 09:27:07PM +0000, Brooks Davis wrote:
> Author: brooks
> Date: Tue Oct 15 21:27:06 2019
> New Revision: 353597
> URL: https://svnweb.freebsd.org/changeset/base/353597
>=20
> Log:
>   Add the ability to link programs against a compat ABI.
>  =20
>   Linkage is controlled by two make knobs:
>   	WANT_COMPAT - Prefer to link against the compat ABI.
>   	NEED_COMPAT - Link against the compat ABI or fail to build.
>  =20
>   Supported values are "32", "soft", and "any".  The latter meaning pick
>   the first[0] supported compat ABI.
>  =20
>   This can be used to provide test binaries for compat ABIs or to link
>   ABI-specific programs.
>  =20
>   [0] We currently support only one compat ABI at a time, but this may
>   change in the future and some code in this commit is structured to ease
>   that change.
>  =20
>   Reviewed by:	bdrewery, jhb
>   Obtained from:	CheriBSD (in concept)
>   Sponsored by:	DARPA, AFRL
>   Differential Revision:	https://reviews.freebsd.org/D22023

This allows simple programs to build/link per the description.  More
work will be required to build programs that depend on things like
MACHINE_ARCH, but this gets the basics working.

-- Brooks

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