title: What's the point of a `.inc` file in C++ & C? What situation would you want to use it?
body: <p>I'm sure this is has been asked before and will be closed and marked as a duplicate but I'm having problems finding it...</p>
  
  <p>For example, at <code>llvm/lib/Support/Unix/Signals.inc</code> within the llvm project. What's the point of using this suffix for a cpp file?</p>