<p>What about this?</p>

<div class="highlight highlight-source-c"><pre><span class="pl-c">// in foo.h</span>
#<span class="pl-k">define</span> <span class="pl-en">ONE</span> <span class="pl-c1">1</span>

<span class="pl-c">// in bar.h</span>
#<span class="pl-k">include</span> <span class="pl-s"><span class="pl-pds">"</span>foo.h<span class="pl-pds">"</span></span>
#<span class="pl-k">if</span> ONE
<span class="pl-k">static</span> <span class="pl-k">const</span> <span class="pl-k">int</span> enabled_code = <span class="pl-c1">42</span>;
#<span class="pl-k">endif</span></pre></div>

<p>Could CTags be used to make it work correctly?</p>

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