title: Start C++ syntax highlighting for .cu (CUDA) files
body: <p>I use Emacs as an editor. Of late whenever I use CUDA files (which usually have extensions <code>.cu</code>) I have to manually do <code>M-x c++-mode</code>  to turn on syntax highlighting and other yasnippet features.  </p>
  
  <p>How do I do I ensure that all <code>.cu</code> files when started in EMACS automatically borrow all the C++ mode features. In other words <code>.cu</code> extension becomes an alias for <code>.cpp</code> extension. </p>
  
  <p>( I know there is a CUDA mode for EMACS, (not inbuilt) but when I installed this mode it does not turn on many of the useful features present in the C++-mode of emacs )   </p>