title: lcov: branches coverage of destructor missing
body: <p>My working environment </p>
  
  <ul>
  <li><p>cygwin</p></li>
  <li><p>lcov 1.13</p></li>
  <li><p>GCC 5.4.0</p></li>
  </ul>
  
  <p>Problem is coverage report in html told that missing branch in destructor but the destructor is empty. I don't know why.
  Anyone can help me ?
  I also try with GCC 4.8.0 but same result
  <a href="https://i.stack.imgur.com/K5eOf.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/K5eOf.png" alt="enter image description here"></a></p>