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Date: Fri, 14 Dec 2007 01:22:32 -0500
From: David Schultz <das@FreeBSD.ORG>
To: Alexander Kabaev <kabaev@gmail.com>
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Cc: Daniel Eischen <deischen@FreeBSD.ORG>, Yar Tikhiy <yar@FreeBSD.ORG>,
	cvs-all@FreeBSD.ORG
Subject: Re: cvs commit: src/lib/msun Symbol.map
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On Thu, Dec 13, 2007, Alexander Kabaev wrote:
> > http://cvsweb.FreeBSD.org/src/lib/msun/Symbol.map.diff?r1=1.5&r2=1.6
> 
> This is just wrong IMHO. New exported symbols should not be introduced
> carelessly and certainly not should be added to the same namespace that
> exists in 7.0. Either we add these to 7.0 before it releases, or they
> should go into their own section which will start collecting all new
> libc symbols to appear in 8.0.
> 
> Daniel, Yar - what is your take on this?

Well, I don't particularly care, but I'll explain why I didn't
think it was important.

The symbols I added are reserved for use in the C math library
according to C99. Hence, any valid C program compiled against
libm.so.5 will not be affected.

Furthermore, I've been adding C99 functions to libc/libm little by
little for years. Occasionally people request that I MFC some of
them, and I do. Some of them get MFC'd before X.1-RELEASE, some of
them get MFC'd before X.2-RELEASE, and so on. Of course, if these
symbols get new versions when they get MFC'd to -STABLE, they need
to be versioned in -CURRENT as well.

In other words, the payoff for being pedantic is low, and the cost
is moderately high. So while I don't feel strongly about this, it
seems easier to declare that programs that abuse reserved C99 symbols
are not guaranteed to work, neither now nor in the future.