title: Undefined symbols for QCompare
body: <p>When building a test with QTestLib, I get an "undefined symbols" error for a <code>qCompare</code> function: </p>
  
  <pre><code>Undefined symbols for architecture x86_64:
    "__ZN5QTest8qCompareIimEEbRKT_RKT0_PKcS8_S8_i", referenced from:
        __ZN15MyTestClass22myTestFunctionEv in MyTestClass.o
  </code></pre>