Date: Fri, 30 May 2008 16:11:28 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Alexander Leidinger <Alexander@Leidinger.net> Cc: Maxim Sobolev <sobomax@FreeBSD.org>, src-committers@FreeBSD.org, d@delphij.net, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org, Daniel Eischen <deischen@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: <20080530161058.B85310@fledge.watson.org> In-Reply-To: <20080530165827.89052ulp729ogzy8@webmail.leidinger.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> <20080529162517.V3678@fledge.watson.org> <20080530165827.89052ulp729ogzy8@webmail.leidinger.net>
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On Fri, 30 May 2008, Alexander Leidinger 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. :-) > > We have the possibility of this behavior even in older releases. Imagine a > 8.0 release and a 8.1 release before a 7.4 release. And let 8.1 have a > symbol which is not available in 8.0 (MF9). Now let's MFC this symbol to > 7-stable before 7.4. Boom, you can not run a 7.4 binary which uses this > symbol on 8.0. > > More or less it comes down to be careful about things to MFC (don't MFC > symbols to the second last branch). I think everyone is fine with "you must be careful". What I think some of us would be less fine with is "you can't do it at all". Robert N M Watson Computer Laboratory University of Cambridge
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