[llvm-dev] RFC: Updating to CMake 3.15.0

Wed Oct 30 09:37:56 PDT 2019

Previously when we suggested upgrading the documentation buildbots to use a
newer version of recommonmark (see [1], with selected responses in [2],
[3]), the feedback we got was that we should not upgrade the buildbots,
because it would create a requirement on a version of recommonmark that
isn't available in any common package manager. (pip is explicitly mentioned
as not a supported package manager). This was completely understandable,
although very sad, because it limits adoption of markdown in documentation.
We've even reverted some markdown back to rst because of it.

So now I'm confused why we'd be proposing that *everyone* must get download
their own version of cmake (3.15) that no package manager has (e.g. latest
debian repos have 3.13: https://packages.debian.org/search?keywords=cmake).
Why not just bump the minimum to 3.10, which seems much more widely
available?

[1] http://lists.llvm.org/pipermail/llvm-dev/2019-June/133038.html
[2] http://lists.llvm.org/pipermail/llvm-dev/2019-June/133068.html
[3] http://lists.llvm.org/pipermail/llvm-dev/2019-June/133075.html

On Wed, Oct 30, 2019 at 2:11 AM Jonas Toth via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> One note: CMake is available with pip, see https://pypi.org/project/cmake/
>
> That makes it easy to install with system having python-pip, which is very
> likely on a developer machine.
>
> Regards, Jonas
> Am 30.10.19 um 06:18 schrieb Neil Nelson via llvm-dev:
>
> I am sure quite a number of packages not supported in the distribution are
> easy to build and install into /usr/local/bin and such.
>
> It is not that it is easy to defeat the standard distribution and update
> procedures as that doing so puts that software out of sync with the
> standard update procedure. From then on the distribution update for cmake
> has no effect. I suspect there are fairly rigid rules on production
> computers against doing this.
>
> I read an email below that said it is common that these kinds of out of
> distribution updates are required anyway. The only manual updates I have
> had to do outside the Ubuntu distribution packages (19.04) are for tbb and
> z3 which are not in the distribution anyway. I have had to install a number
> of additional packages from the distribution, but this is not the case
> under discussion.
>
> For cmake then we are making a new, unique case, a case that I expect is
> against standard procedures for common production installations.
>
> If there are no pressing reasons for this manual requirement, it is on its
> face a bad choice to make. It is against how common distribution software
> is done and has been done for some time now.
>
> Neil Nelson
> On 10/29/19 8:55 PM, Chris Bieneman via llvm-dev wrote:
>
>
>
> On Oct 29, 2019, at 6:14 PM, Mehdi AMINI via llvm-dev
> <llvm-dev at lists.llvm.org> <llvm-dev at lists.llvm.org> wrote:
>
>
> On Tue, Oct 29, 2019 at 3:29 PM James Y Knight via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> CMake is extremely easy for developers to download and build locally --
>> or just download binaries for if you like, too.
>>
>
> Is there any script we can/would provide to help with this? Or is it so
> simple that two lines in the "getting started" instructions would be enough?
>
>
> The instructions for building cmake are *very* simple:
> https://cmake.org/install/
>
> We could easily link to that page from our docs.
>
> -Chris
>
>
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