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copied!<p>For unused macros, you might want to take a look at <a href="http://coan2.sourceforge.net/index.php" rel="nofollow">coan</a>. It has options that might assist with this task. From the <a href="http://coan2.sourceforge.net/index.php?page=about" rel="nofollow">about page</a>:</p> <blockquote> <p>What symbols would appear within active preprocessor directives under a given configuration?</p> <p>(A preprocessor directive is active if it is not within the scope of any false #if). Supposing again that you are interested in the C-source in app, you can display a list of these symbols, with file names and line numbers, with the command:</p> <p>$>coan symbols --recurse --locate --active --once --filter c,h app</p> </blockquote> <p>It has options to remove conditioned out chunks of code (<code>#if 0</code> and friends), and many other useful features for dealing with the C preprocessor. I would use it to collect all the <code>#define</code>d symbols and all the <code>#ifdef</code> or <code>defined</code> symbols and friends. I'd sort and uniq those two collections of symbols and diff them. This is a pretty good way of locating typos. Then I'd take a histogram of them separately and start with the least frequent and work my way up the lists.</p> <p>For unused typedefs, that's another challenge. You could use a cross-reference type program like <a href="http://opengrok.github.io/OpenGrok/" rel="nofollow">OpenGrok</a> or <a href="http://www.gnu.org/software/global/" rel="nofollow">GNU Global</a>, but that's not very automatic.</p>

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