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Date: Thu, 27 Dec 2001 18:01:48 -0800
From: Larry McVoy <lm@bitmover.com>
To: Keith Owens <kaos@ocs.com.au>
Cc: Larry McVoy <lm@bitmover.com>, "Eric S. Raymond" <esr@thyrsus.com>,
        Dave Jones <davej@suse.de>, "Eric S. Raymond" <esr@snark.thyrsus.com>,
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        Marcelo Tosatti <marcelo@conectiva.com.br>,
        linux-kernel@vger.kernel.org, kbuild-devel@lists.sourceforge.net
Subject: Re: State of the new config & build system
Message-ID: <20011227180148.A3727@work.bitmover.com>
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	Larry McVoy <lm@bitmover.com>, "Eric S. Raymond" <esr@thyrsus.com>,
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> Unlike the broken make dep, kbuild 2.5 extracts accurate dependencies
> by using the -MD option of cpp and post processing the cpp list.  The
> post processing code is slow because the current design requires every
> compile to read a complete list of all the files, giving O(n^2)
> effects.  Mark 2 of the core code will use a shared database with
> concurrent update so post processing is limited to looking up just the
> required files, instead of reading the complete list every time.

Ah, OK, I get it.  Hey, would it help to have a dbm interface compat 
library which uses mmap instead of building the db in brk() space?
We've got a small, fast one that you can have under any license you
like, GPL, LGPL, whatever.  We use it all over the BK code.
-- 
---
Larry McVoy            	 lm at bitmover.com           http://www.bitmover.com/lm 
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