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From:	<steven DOT obrien2 AT ntlworld DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Rebasing dlls - why it is necessary
Date:	Tue, 16 Jul 2002 20:18:18 +0000
MIME-Version:	1.0
Message-Id:	<20020716201818.MWDN16050.mta01-svc.ntlworld.com@[10.137.100.61]>

Harold Hunt wrote:

I have a question: Do you think that rebasing the distributed XFree86 DLL's
would have a positive effect on Cygwin/XFree86's performance/load time?  If
so, perhaps I will look into rebasing the dlls that are in 
our packages. 
Otherwise, I don't suppose I need to do anything at all.  :)

Harold,

Do not bother to rebase the Xfree86 dlls. Although giving each dll a unique, non-overlapping base address should in principle reduce the load time of the dll, and hence the 
startup time for exes linked to the dll, this work is best done post-install for cygwin.

The reason is that to support run-time loading of dlls it will effectively be necessary to rebase all cygwin dlls, 
and we cannot know what dlls are installed on a given 
machine, or what image base they use, when building 
packages. I think there is still a plan to incorporate
rebase functionality into setup.exe once a robust rebasing
algorithm has been devised. See the cygwin-apps list 
archives for details.

Steven







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