title: Disable all gcc warnings
body: <p>I'm working on a project that will read compiler error messages of a particular variety and do useful things with them. The sample codebase I'm testing this on (a random open-source application), and hence rebuilding frequently, contains a few bits that generate warnings, which are of no interest to me.</p>
  
  <p>How do I disable all warnings from GCC, so I can just see error messages if there are any?</p>