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Date:      Tue, 27 May 2008 17:21:24 -0700
From:      Maxim Sobolev <sobomax@FreeBSD.org>
To:        Erik Trulsson <ertr1013@student.uu.se>
Cc:        cvs-src@FreeBSD.org, src-committers@FreeBSD.org, Xin LI <delphij@FreeBSD.org>, cvs-all@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:  <483CA584.3080001@FreeBSD.org>
In-Reply-To: <20080527234335.GA24995@owl.midgard.homeip.net>
References:  <200805272004.m4RK4SZt029194@repoman.freebsd.org> <483C7FF2.6000607@FreeBSD.org> <20080527234335.GA24995@owl.midgard.homeip.net>

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Erik Trulsson wrote:
> On Tue, May 27, 2008 at 02:41:06PM -0700, Maxim Sobolev wrote:
>> Xin LI wrote:
>>> delphij     2008-05-27 20:04:27 UTC
>>>
>>>   FreeBSD src repository
>>>
>>>   Modified files:        (Branch: RELENG_6)
>>>     include              string.h 
>>>     lib/libc/string      Makefile.inc memchr.3 
>>>     sys/sys              param.h 
>>>   Added files:           (Branch: RELENG_6)
>>>     lib/libc/string      memrchr.c 
>>>   Log:
>>>   MFC: Add memrchr(3).
>> I think this is not very good idea to MFC that into stable releases 6.x 
>> and 7.x. The reason is that configure scripts for some packages might 
>> detect up this API and enable it. Which means that some binary-only 
>> packages build for say 6.4 won't work on 6.3 and down. AFAIK, both 
>> forward and backward compatibility is required (or at least desired?) 
>> for stable branches.
> 
> No, it isn't.  Backwards compatibility (in the sense that stuff that worked
> on 6.x should still work on 6.x+1) is largely required unless there is
> some very good reason to break compatibility (such very good reasons are
> quite rare.)

Which reasons are they specifically? I can't think of any. The memrchr() 
is not something mandated by the C90 and/or POSIX/SUS. Any software that 
is portable should be able to live without it.

-Maxim



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