From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thorsten Jolitz <tjolitz@gmail.com>
Subject: Re: [Feature request] org-babel-tangle-file add an option to tangle
 if target-file is older than file.
Date: Thu, 18 Sep 2014 12:27:46 +0200
Message-ID: <87tx45te8t.fsf@gmail.com>
References: <541A94F8.8040305@neutrico-themes.pl>
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Marcin Antczak <marcin.antczak@neutrico-themes.pl> writes:

> As in topic.
>
> I think that if both parameters 'file' and 'target-file' are set and
> target-file' exists, 'org-babel-tangle-file' should tangle only if
> target-file' is older.

I think the Org based Emacs Starter Kit does this conditional tangling,
you might have a look there
(http://eschulte.github.io/emacs24-starter-kit/) to see how it is done.

-- 
cheers,
Thorsten