Updating CMake requirement to 2.8.12 RC 1

[Alexander Neundorf]

On Friday 23 August 2013, Ben Cooksley wrote:
> On Fri, Aug 23, 2013 at 7:14 PM, David Faure <faure at kde.org> wrote:
> > On Friday 23 August 2013 06:51:23 Martin Graesslin wrote:
> >> Given that it's already lots of work to keep up with the constant
> >> breakage due  to changes in frameworks the outlook of also having
> >> breakage in cmake is nothing I look forward to.
> > 
> > FWIW, I've been using cmake master for many years, and I can't even
> > remember *ONE* breakage.
> > 
> > But anyway, I'm fine with not requiring git master, since the thread
> > showed that it's not convenient for everyone.
> > 
> > I just wanted to refute the argument about "breakages" :)
> 
> I'll note that build.kde.org has picked up several regressions in the
> past, however these were in the CMake "dev" branch, which is expected
> to be a little bit more unstable than all the others, as it has been
> subject to less testing.

build.kde.org should use the cmake which is required by KF5.
If it additionally does builds using cmake from git that's even better.

Alex