title: What does gdb -i=mi mean?
body: <p>When starting gdb from emacs, emacs says that gdb should be started as</p>
  
  <pre><code>gdb -i=mi
  </code></pre>
  
  <p>The option <strong>-i</strong> is not defined in the gdb man page. If gdb is invoked from the command line with option <strong>-i=mi</strong>, it works. So it must be specific to gdb. Where is the documentation for the -i option?</p>