[LLVMdev] [RFC] Raise minimum required CMake version to 3.0

[Chris Bieneman]

I’m not too familiar with Ubuntu’s LTS releases, but from some google digging I believe there are 3 active LTS releases.

10.04 has CMake 2.8.0 (which is already below our minimum), but 10.04 will be dropping out of LTS this year.
12.04 has CMake 2.8.7 (also below our minimum)
14.04 has CMake 2.8.12.2, which should also have the fix for MSVC

Based on this, it might be reasonable to update the minimum to 2.8.12.2 instead of 3.0.0.

Thoughts?
-Chris

> On Feb 9, 2015, at 11:28 AM, Chandler Carruth <chandlerc at google.com> wrote:
> 
> 
> On Mon, Feb 9, 2015 at 11:12 AM, Chris Bieneman <beanz at apple.com <mailto:beanz at apple.com>> wrote:
> It came up on another thread that our current minimum required CMake version 2.8.8, has some bugs that cause issues when building with MSVC + Ninja, and one potential solution was to raise the minimum required version of CMake.
> 
> CMake 3.0 is now 6 months old and CMake 3.1 has been released. I would like to propose moving our minimum required CMake version to 3.0.
> 
> I’ve attached patches to enforce the change in case anyone wants to test it out.
> 
> Thoughts/comments/concerns/objections?
> 
> What is the latest version of CMake available for supported LTS versions of ubuntu? The analogous other linux distros? I think if we can, we should preserve support for their pre-installed CMake versions to make bootstrapping easier.
> 
> I think it is fine to let folks that want to use Ninja on Windows grab a more recent CMake -- this shouldn't block the 2013 stuff at all.

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