hard-dep for Qt 4.8

[Thomas Zander]

On Thursday 19 January 2012 08.15.39 Martin Gräßlin wrote:
> > As far as I know there are no forward incompatible behavior changes
> > between Qt4.7 and Qt 4.8> I.e. AFAIK programming for 4.8 using 4.7 APIs
> > but 4.8 behavior will give
> > the same behavior on 4.7.

> What comes to my mind is multi thread support for QtOpenGL [1]. That is
> using  threaded OpenGL with Qt 4.8 will work, while it fails with 4.7
> without rendering a compile error.

The enum Qt::AA_X11InitThreads is not available in 4.7, which enables the 
functionality mentioned in the blog.   Using that would give a compile error.

-- 
Thomas Zander