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

[Rafael Espíndola]

Installing cmake on Linux is as easy (or easier) than installing it on os x
and windows. I really don't understand the requirement of having to work
with the system provided one.
On Mar 10, 2015 2:26 PM, "Chris Bieneman" <beanz at apple.com> wrote:

> I should also point out that CMAKE_SYSROOT and
> CMAKE_<LANG>_COMPILER_TARGET (both CMake 3.0 features) would make fixing
> compiler-rt's CMake (Bugs 14109 & 21562) a lot easier. Both of those bugs
> are currently blockers to depreciating the autotools build system.
>
> Also, while Debian may release a stable build with CMake 3.x later this
> year, Ubuntu probably won’t have a LTS release with CMake 3.x until
> sometime in 2016.
>
> If deprecating autotools is a priority to the community we may want to
> consider a strategy for updating CMake more rapidly than waiting for stable
> releases from Linux distributions.
>
> -Chris
>
> > On Mar 10, 2015, at 10:38 AM, Mehdi Amini <mehdi.amini at apple.com> wrote:
> >
> > Hi Tobias,
> >
> >> On Feb 24, 2015, at 9:32 AM, Tobias Grosser <tobias at grosser.es> wrote:
> >>
> >> 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?
> >
> > In light of the list of new features that Chris listed, and considering
> that Debian 8 is frozen (RC1 already shipped in January) and should be
> released before the next LLVM version (but who knows with Debian…), do you
> have a plan to update CMake on all your bots? Or do you still have strong
> other concerns?
> >
> > Thanks,
> >
> > Mehdi
> >
> >
> >
> >
>
>
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