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Date:      Thu, 29 May 2008 16:29:34 +0100 (BST)
From:      Robert Watson <rwatson@FreeBSD.org>
To:        Daniel Eischen <deischen@freebsd.org>
Cc:        Maxim Sobolev <sobomax@freebsd.org>, src-committers@freebsd.org, d@delphij.net, cvs-src@freebsd.org, cvs-all@freebsd.org, Xin LI <delphij@freebsd.org>, re@freebsd.org, David Schultz <das@freebsd.org>
Subject:   Re: cvs commit: src/include string.h src/lib/libc/string Makefile.inc memchr.3 memrchr.c src/sys/sys param.h
Message-ID:  <20080529162517.V3678@fledge.watson.org>
In-Reply-To: <Pine.GSO.4.64.0805291106120.12774@sea.ntplx.net>
References:  <200805272004.m4RK4SZt029194@repoman.freebsd.org> <483C7FF2.6000607@FreeBSD.org> <483C977F.20105@delphij.net> <20080528060333.GA4699@zim.MIT.EDU> <Pine.GSO.4.64.0805281049150.7240@sea.ntplx.net> <20080529084608.X39873@fledge.watson.org> <Pine.GSO.4.64.0805291106120.12774@sea.ntplx.net>

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On Thu, 29 May 2008, Daniel Eischen wrote:

>> So, this is neither a vote for nor against a backout, but this is a general 
>> call to resist the conservative tendancy that says "don't MFC minor things" 
>> because, in macro, it has a significant drag effect on the MFC process that 
>> keeps RELENG branches maintainable.
>
> Ok, but consider the prior email with kan about MFC's after an 8.0 release. 
> Since you must be able to run 7.x binaries on 8.0, then you can't MFC any 
> symbol changes from 8.0+ back to 7.x.  The symbols are basically frozen in 
> 7.x after 8.0 is released.

Sounds like a bug.  :-)

I realize that is a rather simplistic view, but the reality is that we want 
the best of both worlds: we like having active feaure merging, and we like 
having multiple active branches with releases after a .0.  In fact, having a 
.4 on one branch after a .0 on the next branch seems pretty central to our 
world view.  As many downsides as library versions had, one upside was the 
ability to do this.  I need to go read Alexander's e-mail, but it seems that 
really this limitation shouldn't have to exist.

Robert N M Watson
Computer Laboratory
University of Cambridge



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