title: GCOV: gcda files combination
body: <p>Good afternoon,</p>
  <p>I'd like to know if it could be possible to combine several gcda files without using the <code>lcov -a tracefile1 -a tracefile2 -o output.html</code>.</p>
  <p>Actually this is my spec:</p>
  <p>compile my code on local server
  excute tests on remote server 1 and 2</p>
  <p>{</p>
  <ul>
  <li><p>then copy the generated gcda on server1 on the local compilation server and generate the info file thanks to lcov</p>
  </li>
  <li><p>then copy the generated gcda on server2 on the local compilation server  and generate the info file thanks to lcov</p>
  </li>
  <li><p>then combine both info files</p>
  </li>
  </ul>
  <p>}</p>
  <p>The info file generation is actually quite long and I'd like to know if there is a possibility to combine gcdas from servers 1 and 2 without creating the info file.
  And generate the info file only for the resulting gcdas?</p>