title: How to remove Profiling *.gcda:Cannot open errors with python virtualenv builder?
body: <p>In <code>jenkins</code> output I am getting the following errors. Is this a problem or can it be silenced?</p>
  
  <pre><code>profiling:/opt/Python-3.6.1/Python/structmember.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Python/getcompiler.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Objects/odictobject.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Objects/enumobject.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Objects/descrobject.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Objects/cellobject.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Objects/bytes_methods.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Objects/accu.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Parser/myreadline.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Parser/parser.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Modules/xxsubtype.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Modules/symtablemodule.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Modules/zipimport.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Modules/stringio.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Modules/textio.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Modules/bufferedio.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Modules/bytesio.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Modules/fileio.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Modules/iobase.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Modules/_iomodule.gcda:Cannot open
  profiling:/opt/Python-3.6.1/Modules/_localemodule.gcda:Cannot open
  </code></pre>
  
  <p>I built python from source on the <code>debian 8</code> server.</p>