title: ERROR while code coverage report using lcov
body: <p>I am trying to run coverage on my project, after updating to Ubuntu 16.04.
  I get</p>
  
  <pre><code>Deleted 665 files
  Writing data to coverage.info.cleaned
  lcov: ERROR: cannot write to coverage.info.cleaned!
  CMakeFiles/coverage.dir/build.make:57: recipe for target 'CMakeFiles/coverage' failed
  make[3]: *** [CMakeFiles/coverage] Error 13
  CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/coverage.dir/all' failed
  make[2]: *** [CMakeFiles/coverage.dir/all] Error 2
  CMakeFiles/Makefile2:74: recipe for target 'CMakeFiles/coverage.dir/rule' failed
  make[1]: *** [CMakeFiles/coverage.dir/rule] Error 2
  Makefile:129: recipe for target 'coverage' failed
  make: *** [coverage] Error 2
  enter code here
  </code></pre>
  
  <p>Before the update I had no problem running the coverage</p>