Some Qt Creator's project templates have something similar to the next line:

const QStringList v = QString::fromAscii(qVersion()).split(QLatin1Char('.'));

share/qtcreator/templates/qtquickapp/qmlapplicationviewer/qmlapplicationviewer.cpp
share/qtcreator/templates/mobileapp/mainwindow.cpp
share/qtcreator/templates/html5app/html5applicationviewer/html5applicationviewer.cpp

It is used at ...::setOrientation() method.

I think - QString::fromLatin1() should be used instead.

QString::fromAscii() is invalid because:

http://developer.qt.nokia.com/doc/qt-4.8/qstring.html#fromAscii

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Note that, despite the name, this function actually uses the codec defined by QTextCodec::setCodecForCStrings() to convert str to Unicode. Depending on the codec, it may not accept valid US-ASCII (ANSI X3.4-1986) input. If no codec has been set, this function does the same as fromLatin1().
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So it depends to the codec, and the current codec even might convert qVersion() output to something totally unusable.