Re: Recent changes to sysctl.h breaks glibc

["H. Peter Anvin" <hpa@zytor.com>]

Followup to:  <Pine.LNX.4.44.0305191039320.16596-100000@home.transmeta.com>
By author:    Linus Torvalds <torvalds@transmeta.com>
In newsgroup: linux.dev.kernel
> 
> A number of headers have historical baggage, mainly to support the 
> old libc5 habits, and because removing the ifdef's is something that 
> nobody has felt was worth the pain.
> 
> I think the only header file that should be considered truly exported is 
> something like "asm/posix_types.h". For the others, we'll add __KERNEL__ 
> protection on demand if the glibc guys can give good arguments that it 
> helps them do the "copy-and-cleanup" phase.
> 

Copy and cleanup isn't realistic either, though, because it doesn't
track ABI changes.  ABI headers is the only realistic solution.  We
can't realistically get real ABI headers for 2.5, so please don't just
break things randomly until then.

	-hpa
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