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copied!<p>There are two tools I know of that you could use to do this semi-automatically.</p> <p>One is <a href="https://sourceforge.net/projects/sunifdef/" rel="nofollow noreferrer"><code>sunifdef</code></a> (son of <code>unifdef</code>). AFAIK, this is no longer being maintained, though (and neither is <code>unifdef</code> on which it is based).</p> <p>The other is <a href="http://coan2.sourceforge.net/index.php" rel="nofollow noreferrer"><code>coan</code></a>, which is being actively maintained, and is a development of <code>sunifdef</code>.</p> <p>See also: <a href="https://stackoverflow.com/questions/525283/is-there-a-c-pre-processor-which-eliminates-ifdef-blocks-based-on-values-define">Is there a C pre-processor which eliminates <code>#ifdef</code> blocks based on values defined/undefined?</a>.</p> <p>As it happens, I'm still using <code>sunifdef</code> on the main project at work where I'm eliminating archaic code (for example, machines not supported since about 1996) from the code base. The only gotcha I have with it is that if a line goes in with parentheses like this:</p> <pre><code>#if (defined(MACH_A) && defined(PROP_P)) || (defined(MACH_B) && defined(PROP_Q)) || \ (defined(MACH_C) && defined(PROP_R)) </code></pre> <p>and we have <code>-UMACH_C</code> (so machine C is no longer supported), the output line is:</p> <pre><code>#if defined(MACH_A) && defined(PROP_P) || defined(MACH_B) && defined(PROP_Q) </code></pre> <p>Technically, that's fine; it is correct. It is just preferable to keep the extra, technically redundant parentheses in the expression.</p> <p>One caveat: although I can answer for these compiling on Unix-based systems, I've not personally checked them out on Windows.</p>

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