title: Is there a way to see a more verbose output from Clang?
body: <p>I would like to see a more verbose output from <code>clang</code>, more than it produces when run as <code>clang -v</code>.</p>
  
  <p>So far I tried: <code>clang --help</code>, <code>clang --help-hidden</code> and <code>clang -cc1 --help</code> but didn't find anything that would help.</p>
  
  <p>I am particularly interested in whether I can see the traces of a reasoning that <code>clang</code> does to decide on if it has to recompile a particular .cpp file.</p>