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

[Siva Chandra via libc-dev]

On Tue, Mar 24, 2020 at 9:01 PM Petr Hosek via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> 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.
>

+1
For libc, we want 3.13 or above. Not that it matters immediately as we
don't expect llvm-libc it to be meaningfully useful at least for a
few months more. But, considering that a bump like this will take a few
months anyway, I do want to push for 3.13+.


>
> 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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