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

[Tobias Grosser]

On 24.02.2015 17:45, Tobias Grosser wrote:
> On 09.02.2015 20:12, Chris Bieneman 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?
>
> Hi Chris,
>
> this update broke my cmake LLVM+Polly buildbot (to my knowledge most
> other bots use autoconf). I reverted this temporarily to avoid the
> buildbot noise (this comes a little late, as I was traveling the last
> days).
>
> The buildbot is based on the latest debian stable (wheezy), which comes
> with cmake 2.8.9. Is 2.8.9 enough to fix the bug?
>
> Also, could we just limit the cmake version on windows builds? In the
> end on linux cmake 2.8.9 works great.

Rafael asked if updating the bot is not an option. It indeed is an 
option, but requires cmake to be manually downloaded and installed 
instead of using the available packages.

This is OK for one bot, but it will add complications for everybody who 
uses debian and wants to install LLVM. It also will make it more 
complicated to move to a fully cmake based build as all such debian 
based buildbots would require a manual installation of cmake (I have 12 
more of these).

Before doing so I wanted to understand if it is indeed intended to 
require debian-stable users to *manually* install and manage cmake or if 
there is not a lower overhead version. Can this bug not be fixed for 
windows without complicating live for debian users?

Cheers,
Tobias