title: Preprocessor definitions not working in VS2019 C++
body: <p>I have a QT 4.8 app in VisualStudio 2019 and no matter what I setup in the active configuration Preprocessor definitions, none of them seems to apply to the project.</p>
  
  <p>If I go to check what should be applied to the current file, it seems to have it, but visual studio shows the #ifdef in gray and the #else active, which should not be true.</p>
  
  <p><a href="https://i.stack.imgur.com/IvitF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/IvitF.png" alt="enter image description here"></a></p>
  
  <p>What could be the problem?</p>