Reminder: CMake 2.6.4 will be required for trunk/ May 1st

[Alexander Neundorf]

Hi,

as announced, from now on CMake 2.6.4 is required for building KDE trunk.
Let me know if you hit any issues.

Alex

On Tuesday 27 April 2010, Alexander Neundorf wrote:
> Hi,
>
> just a quick reminder: in case you are still using CMake 2.6.2 or 2.6.3,
> it's about time to update to at least 2.6.4, which will be required May
> 1st, i.e. Saturday this week.
> For a download link see the mail below.
>
> Alex
>
> ----------  Forwarded Message  ----------
>
> Subject: [ANNOUNCE] CMake 2.6.4 will be required for trunk/ May 1st
> Date: Wednesday 14 April 2010
> From: Alexander Neundorf <neundorf at kde.org>
> To: kde-core-devel at kde.org
>
> Hi,
>
> after a short discussion on kde-buildsystem we decided that starting May
> 1st CMake 2.6.4 will be required to build KDE trunk/, i.e. what will become
> KDE 4.5.
> So, you have now two weeks time to update to at least 2.6.4 in case you are
> still using CMake 2.6.2 or 2.6.3.
>
> Why do we raise the required version ?
>
> Well, there are two things in CMake 2.6.3 which will become more and more
> important the more projects are using CMake to install their libs, and we
> need 2.6.3 in order to be compatible with them.
> They are
>
> 1) The main thing: the find_package() command in CMake 2.6.3 additionally
> searches in lib/cmake/Foo/ for installed FooConfig.cmake files, while CMake
> 2.6.0..2.6.2 only look in lib/Foo/cmake/. So to be able to
> successfully "find" those files installed to the 2.6.3-compatible location
> currently we need some more manual work, as we do e.g. with
> FindSharedDesktopOntologies.cmake. This works, but the more libraries we
> use which do this, the more often we will run into this issue.
> By requiring CMake 2.6.4 it will just work and so safe us work.
>
>
> 2) Also new in CMake 2.6.3 was the feature to use parenthesis in
> if()-statements, so you can do now
> if(FOO AND (BAR OR BLAH))
>
> While we could ensure that we don't get such code in KDE trunk/, we cannot
> do anything about this in installed FooConfig.cmake files (see above) which
> we may need to use. So this is also for compatibility and also for your
> convenience :-)
>
>
>
> These two features of CMake 2.6.3 are the reason to require CMake 2.6.4 for
> trunk (and KDE 4.5.x).
> Why then require 2.6.4 and not 2.6.3 ?
> While we could probably still live with 2.6.2 for KDE 4.5, only less than 5
> percent of our developers are actually still using 2.6.2 or 2.6.3
> (http://www.kdedevelopers.org/node/4198), so the upgrade doesn't seem to
> create to much work for our development community :-)
>
> Also, 2.6.4 there is at least one bug fix
> (http://public.kitware.com/Bug/view.php?id=8843) which seems to be
> interesting for us, and so since only around 1 percent are actually using
> 2.6.3 currently, we just go directly to 2.6.4 to have that bug fixed too.
>
>
> If you don't have CMake >= 2.6.4 yet, your distribution doesn't provide
> packages and you don't want to build it from source, just download the
> binary release from Kitware and untar it somewhere, e.g. /opt/, it will
> just work: http://www.cmake.org/files/v2.8/cmake-2.8.1-Linux-i386.tar.gz
> (here's the directory with the releases for all platforms:
> http://www.cmake.org/files/v2.8/)
>
>
> So, if you don't have serious objections, starting May 1st CMake 2.6.4 will
> be required for trunk/.
>
>
> Alex
>
> -------------------------------------------------------