问使用VS2012编译器的32位Qt5构建中的ICU支持会导致Qt5构建失败；因此，Webkit也是不可构建的

EN

QTextCodec* QTextCodec::codecForLocale()
{
    QCoreGlobalData *globalData = QCoreGlobalData::instance();
    if (!globalData)
        return 0;

    QTextCodec *codec = globalData->codecForLocale.loadAcquire();
    if (!codec) {
#ifdef QT_USE_ICU

        // THIS BLOCK IS REACHED WHEN ICU IS ENABLED

        textCodecsMutex()->lock();

        // ***
        // The following codec returned is NULL!!!
        //   (Internally, it sets the codec name to "US-ASCII",
        //    and fails to find a codec with this name)
        // ***
        codec = QIcuCodec::defaultCodecUnlocked();

        textCodecsMutex()->unlock();
#else
        // setupLocaleMapper locks as necessary
        codec = setupLocaleMapper();
#endif
    }

    return codec;
}