[CMake] Testing Qt 5 RC 1 CMake files

[Stephen Kelly]

Clinton Stimpson wrote:

> 
> I took a peek at building it earlier with Qt5.

Great, thanks for that.

> 
> I started making changes and one of the more surprising ones was that
> #include <QtGui/QWidget>
> pulled in my Qt4 QWidget from /usr/include/QtGui/QWidget.
> Instead of Qt5's QtWidgets/QWidget.  That led to confusing linker errors.

Another reason never to use 'module includes' :). I always discourage their 
use.

> I got as far as trying to build some examples, but many of the examples
> seem
> to be broken.  Does anyone know if the master branch has become stable and
> whether functionality and examples have been restored since the start of
> the breaking modularization changes months ago?
> I stopped when I saw these kinds of build problems.
> 

I didn't try running any examples, but I also ported it to Qt 5. My patch 
for that is attached. John, the patch for older VTK versions should be 
similar if you wish to try it.

Thanks,

Steve.