title: Qt Creator debugger very slow
body: <p>I'm using <em>Qt Creator</em> debugger but when I want to inspect the current <code>this</code> variable by expanding it from the <em>Locals and expressions</em> view, it take quite a long (about 30 seconds) before giving back control.</p>
  
  <p>I noticed the following message in the <em>Debugger Log</em> view:</p>
  
  <pre><code>3518fetchVariables({"autoderef":1,"context":"","displaystringlimit":"100","dyntype":1,"expanded":["return","inspect","local.this","watch","local"],"fancy":1,"formats":{},"nativemixed":0,"partialvar":"local.this","passexceptions":0,"qobjectnames":1,"stringcutoff":"10000","token":3518,"typeformats":{},"watchers":[]})
  (lldb) script theDumper.fetchVariables({"autoderef":1,"context":"","displaystringlimit":"100","dyntype":1,"expanded":["return","inspect","local.this","watch","local"],"fancy":1,"formats":{},"nativemixed":0,"partialvar":"local.this","passexceptions":0,"qobjectnames":1,"stringcutoff":"10000","token":3518,"typeformats":{},"watchers":[]})
  bridgemessage={msg="Searching for type QObjectPrivate across all target modules, this could be very slow"},
  eERROR: Lldb stderr: error: PlaybackDevice.o DWARF DW_TAG_array_type DIE at 0x0000db86 has a class/union/struct element type DIE 0x0000db92 that is a forward declaration, not a complete definition.
  Try compiling the source file with -fno-limit-debug-info or disable -gmodule
  </code></pre>
  
  <p>I'm using:</p>
  
  <ul>
  <li><em>Qt 5.9.2</em></li>
  <li><em>Qt Creator 4.5.0</em></li>
  <li><em>OSX 10.12.6</em>.</li>
  </ul>
  
  <p><strong>Edit:</strong></p>
  
  <p>As Kuba Ober suggests I use a debug build of Qt (5.10.0) thanks to this link: <a href="https://stackoverflow.com/questions/48076697/qt-creator-debugger-very-slow">Qt Creator debugger very slow</a></p>
  
  <p>Unfortunately the message has changed to:</p>
  
  <pre><code>eERROR: Lldb stderr: error: PlayBackDevice.o DWARF DW_TAG_array_type DIE at 0x0000f43e has a class/union/struct element type DIE 0x0000f44a that is a forward declaration, not a complete definition.
  Try compiling the source file with -fno-limit-debug-info or disable -gmodule
  </code></pre>