title: Configuring the GCC compiler switches in Qt, QtCreator, and QMake
body: <p>I recently tried to use <a href="http://en.wikipedia.org/wiki/Qt_Creator" rel="noreferrer">Qt Creator</a> 1.3.2, Qt 4.6.2, and GCC 4.4.0 (32-bit version) on Windows 7 (64-bit) to compile an application using some of the experimental C++0x extensions and encountered the following (fatal) error:</p>
  
  <blockquote>
    <p>This file requires compiler and library support for the upcoming
    ISO C++ standard, C++0x. This support is currently experimental, and must be
    enabled with the -std=c++0x or -std=gnu++0x compiler options.</p>
  </blockquote>
  
  <p>In my search for a solution, I came across the thread <em><a href="http://lists.trolltech.com/qt-interest/2004-05/thread00001-0.html" rel="noreferrer">qmake and compiler flags?</a></em>, and added the following to the .pro file:</p>
  
  <pre><code>CXXFLAGS += -std=c++0x
  </code></pre>
  
  <p>but that didn't seem to make a difference.</p>
  
  <p>So, I expect there's some tag I need to add to the .pro (project) file, but I've never messed with the GCC compiler switches in Qt, QMake, and QtCreator before, and I am uncertain about the proper invokation / incantation.  So, my question is how do you set GCC compiler switches when using QtCreator, QMake, and Qt?</p>