title: How to specify build directory in Qt Creator for shadow build without use of an absolute path?
body: <p>Absolute paths are ridiculous. All we need - and all we are allowed, by the way - is to use a folder on the same level that the folder containing .pro file for shadow builds. There are bugs otherwise.</p>
  
  <p>But you can't just specify <code>../mingw_debug</code> for example. Yes, it is a relative path but relative to what? It turns out it is relative to current directory of Qt Creator, and this is completely meaningless.</p>
  
  <p><code>%{sourceDir}</code> is of no help either. <code>%{sourceDir}/../mingw_debug</code> dosen't work, at least on Windows. If there was a way to extract parent folder from sourceDir!</p>
  
  <p>Does anybody know a way to solve the issue?</p>