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From: Stefan Monnier <monnier@iro.umontreal.ca>
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Subject: Re: How do I remove "reference to free variable" warnings on
	buffer-local variables?
Date: Wed, 11 Nov 2009 00:09:33 -0500
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> I have code that uses buffer local variables. I don't want to declare
> this variable global. So how can I remove messages of the form
> "reference to free variable `...' " when I byte compile a file?

There is a special use of defvar designed specifically for that
situation:

  (defvar <my-var-here>)

this will have no effect other than silence the byte-compiler.


        Stefan


PS: If you really really want to, you can put it inside
`eval-when-compile', in which case it may currently work by accident,
but it logically shouldn't work (and may not work in the future) since
(defvar <foo>) does nothing when evaluated, and `eval-when-compile' asks
the byte-compiler to eval its argument instead of byte-compiling it.