Please upgrade to cmake 3.4.3+ on llvmsvn buildbot

[yuyichao]

LLVM recently switched to require cmake 3.4.3+ so we need to upgrade it on the buildbot (It was announced on llvm-dev a few month ahead but I didn't realized that we'll be affected...)

@staticfloat @tkelman

[tkelman]

I may have enough of the login info to do this manually, just download https://cmake.org/files/v3.5/cmake-3.5.2-Linux-x86_64.tar.gz then set CMAKE in Make.user or in the command-line make flags to point to it. Don't bother trying to move it around or make symlinks to put it in /usr/local, you'll get complaints about CMAKE_ROOT not being set.

I'd rather avoid doing this manually though, it should be automated in the provisioning scripts. I don't know how those work or where all of them are. Something to do with ansible which I've never really touched apart from modifying a yml file once or twice.

[staticfloat]

I'm back from Mexico, this should be done now.

For reference, this is done by running something like ansible-playbook -i hosts -v buildslaves.yml -l buildslave_ubuntu14.04-x86,buildslave_ubuntu14.04-x64 on buildslaves.yml from this repository. Note that if you want to run this locally, you're gonna need some ansible roles such as this buildslave role.

[staticfloat]

Wait, no, I didn't realize that I have to add a PPA for this. Stand by.

[tkelman]

Is there a PPA that has 3.4.3 or newer?

[staticfloat]

Nope, we're building and installing it to ~/local now. This should be done now, although the location of cmake has changed, so not sure if we need to nuke the buildbots or not.