[RFC] Raise minimum required CMake version to 2.8.12.2

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1

Hello LLVM-Dev!

I would like to request that we raise the minimum required CMake version to 2.8.12.2.

My primary reason is that I would like to re-land this patch http://reviews.llvm.org/D8380 which broke the buildbots due to using a CMake 2.8.12 feature (see: http://lab.llvm.org:8011/builders/polly-amd64-linux/builds/28499/steps/cmake-configure/logs/stdio)

Additionally since we are updating MSVC users would benefit from a fix in 2.8.12.1, and Xcode users would benefit from fixes in 2.8.12.2

CMake 2.8.12.2 is also the version in Ubuntu Trusty.

Thanks,
-Chris

2

I also meant to include this URL to the change log for CMake 2.8.12.x:

http://www.cmake.org/Wiki/index.php?title=CMake/ChangeLog&oldid=55110

-Chris

3

Thanks for temporarily reverting and sorry for the breakage.

I already had cmake 3.* installed on my buildbot, but the cached configure script was still referring to the old cmake version. I fixed this now, such that this commit should not break anymore on my bot.

(I personally am not negatively affected by this update so no complains

Cheers,
Tobias

4

Since we’ve hashed this issue to death, and we had previous agreement to make this change (see: http://lists.cs.uiuc.edu/pipermail/llvmdev/2015-February/081966.html) I’m going to commit this change later this afternoon.

Please speak up now if you have any problems with this.

Thanks,
-Chris