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From: "Pascal J. Bourguignon" <pjb@informatimago.com>
Newsgroups: gmane.emacs.help
Subject: Re: Avoiding 'reference to free variable' warnings while splitting
	elisp source files
Date: Sat, 23 Mar 2013 17:19:40 +0100
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Jay Belanger <jay.p.belanger@gmail.com> writes:

>> Is there a sane way to split the source of an elisp file
>> while avoiding the 'reference to free variable' warnings
>> when byte-compiling?
>>
>> The problem arises when a variable defined in one file
>> is used in another.   How does one avoid those errors?
>
> You can put
> (defvar variable-name)
> in the other file.

Nope.  Because then the initialization depends on the order of loading
the files.

You can put the defvar in a variable.el file that is required by all the
others.

-- 
__Pascal Bourguignon__                     http://www.informatimago.com/
A bad day in () is better than a good day in {}.