QPixmap QPixmap::fromImage(QImage && image, Qt::ImageConversionFlags flags = Qt::AutoColor) overwrites source image

Looking into the documentation this seems to be intended.
But it's extremely dangerous and quite unpredictable.
The behavior also seems to be compiler dependent!

Asume that you have a function that returns a QImage. "test.png" is RGBA8888 but has no transparent pixels. The format could be RGB888 but is set to RGBA8888

static QImage getImage()
{
   static QImage img;
   if(img.isNull())
   {
      img = QImage("test.png");
      img.setFormat(Qt::RGBA8888);
   }
   return img;
}

The following code does not change the value of the static "img":

void test1()
{
    QImage image = getImage();
    QPixmap pixmap = QPixmap::fromImage(imgage);
}

This code changes the value of the static "img":

void test2()
{
    QPixmap pixmap = QPixmap::fromImage(getImage());
}

At least when compiled with Visual Studio.
It seems that gcc does not change the value of "img".

Please do not create functions that behave compiler dependent and are completely unpredictable!