[llvm-dev] Bumping the CMake requirement for libc++ and libc++abi

[Petr Hosek via llvm-dev]

In October, there was a discussion about updating CMake to 3.15:
http://lists.llvm.org/pipermail/llvm-dev/2019-October/136295.html. No
decision was made, but maybe we should revisit that proposal? If we're
going to require a newer version of CMake for some subprojects, I'd prefer
to bump the minimum CMake version for all of LLVM.

On Tue, Mar 24, 2020 at 8:11 PM Louis Dionne via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi,
>
> The minimum CMake version currently advertised for libc++ and libc++abi is
> currently 3.4.3. I think the oldest version of CMake actually being tested
> on any builder is 3.7.0, so advertising 3.4.3 is somewhat of a lie (I'm
> pretty sure we're using features that require a more recent version
> already). However, we do need to bump it to 3.8.0 at least because CMake
> 3.7 doesn't know about C++17 in its compilation features, and we'll need
> that to build libc++ properly going forward. This will mean for bot owners:
> 1. They need to upgrade CMake on the builders to at least 3.8.0 (which is
> really easy), or
> 2. they can disable processing of libc++ and libc++abi's CMake files by
> making sure they do not appear in LLVM_ENABLE_PROJECTS
>
> Any objections?
>
> Cheers,
> Louis
>
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