title: cmake -D <var>:<type>=<value>: what can <type> be?
body: <p><code>-D &lt;var&gt;:&lt;type&gt;=&lt;value&gt;</code>: Create a cmake cache entry.</p>
  
  <p>ok, but what can <code>&lt;type&gt;</code> be? I've seen BOOL, STRING, PATH, FILEPATH. What else can that type be?</p>