title: G++ version and std option
body: <p>I see one of my makefile and see the below command.</p>
  
  <pre><code>g++-5 -std=c++11 
  </code></pre>
  
  <p>From what I understand, the std option represents this - </p>
  
  <p>GCC supports different dialects of C++, corresponding to the multiple published ISO standards. Which standard it implements can be selected using the -std= command-line option.</p>
  
  <p>What does -5 in the g++ command signifies?</p>