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Date: Tue, 27 May 2008 07:06:25 -0400
From: David Schultz <das@FreeBSD.ORG>
To: Peter Wemm <peter@wemm.org>
Message-ID: <20080527110625.GA97301@zim.MIT.EDU>
Mail-Followup-To: Peter Wemm <peter@wemm.org>,
	Poul-Henning Kamp <phk@phk.freebsd.dk>,
	John Birrell <jb@what-creek.com>,
	Robert Watson <rwatson@FreeBSD.ORG>, John Birrell <jb@FreeBSD.ORG>,
	src-committers@FreeBSD.ORG, cvs-src@FreeBSD.ORG,
	cvs-all@FreeBSD.ORG
References: <20080525221112.GH5179@what-creek.com>
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Cc: src-committers@FreeBSD.ORG, cvs-src@FreeBSD.ORG, cvs-all@FreeBSD.ORG,
	Poul-Henning Kamp <phk@phk.freebsd.dk>, John Birrell <jb@FreeBSD.ORG>,
	Robert Watson <rwatson@FreeBSD.ORG>, John Birrell <jb@what-creek.com>
Subject: Re: cvs commit: src Makefile
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On Mon, May 26, 2008, Peter Wemm wrote:
> On Mon, May 26, 2008 at 12:06 AM, Poul-Henning Kamp <phk@phk.freebsd.dk> wrote:
> > In message <20080525221112.GH5179@what-creek.com>, John Birrell writes:
> >
> >>I will back out the change, but I think you are making the 'universe' target
> >>out to be more than was intended. We used to talk about tiers. We seem to have
> >>lost sight of that.
> >
> > No, architecture tiers is about code how well the code runs, make
> > universe is simply a way to keep it compiling.
> 
> sparc64 and sun4v share userland.  The sparc64 in universe overs 99%
> of the compile test for sun4v already.
> 
> It seems a shame to compile sparc64 userland twice for universe.  And
> on that note, do we compile i386 twice for i386 and pc98?
> 
> I might find myself more inclined to use 'universe' if it had less
> duplicated work.

I've always thought it would be nice to have a stripped-down
version of make universe (make galaxy?) that compiled for a
representative sample of platforms, and with only one or two
kernels per platform instead of 3 or 4 or 5. For small changes,
this represents a better tradeoff in time spent compiling vs. the
cost of things breaking occasionally. For actively developed
platforms, breaking the build wastes lots of people's time; for
everything else, there's tinderbox.