Drop support for < CMake 3.10?

[hjmallon]

CMake is now warning if you have cmake_minimum_required(VERSION xxx) less than 3.10. This makes our builds very noisy as hunter uses 3.5 a lot.

Could either make minimum policy 3.12 but still support 3.5

cmake_minimum_required(VERSION 3.5...3.12)

OR

lose support for < 3.10 entirely?

cmake_minimum_required(VERSION 3.10)

[NeroBurner]

Deprecation is always a hard subject. What are the CMake version of the popular Linux Distros (I'm thinking about the supported Ubuntu, Debian, Fedora versions in particular)

[NeroBurner]

Related PR for CMake 3.5 increase:

#689

[hjmallon]

Based on the comments here I have implemented the backwards compatible (to 3.5) way in the 2 PRs above

[NeroBurner]

Any reason you chose 3.12 Abd not 3.11?

[hjmallon]

Minimum would have been 3.10, I went with 3.12 since that was the next commonly used cmake_minimum_required in hunter.

I am happy to change it to 3.10 if that would be easier to merge. It was sort of an arbitrary choice.

[TheNetos]

Just for reference - according to pkgs.org the minimum version for current distributions is 3.11.4 for Oracle Linux 8, but 3.26.5 is also available there.

[NeroBurner]

Thanks for looking. Then I suggest to increase the minimum Version to 3.12 and drop support for anything lower. Running with your random number, because of "that was the next commonly used" comment

[hjmallon]

Ubuntu 16.04 is supported through 2028 according to this https://ubuntu.com/about/release-cycle

It uses cmake 3.5. However its very easy to build 3.31 using cmake 3.5, I suspect most people using Hunter in a serious way have a more recent cmake.

---

Shall I make an MR with just cmake_minimum_required(VERSION 3.12) then? That version is from July 2018 according to the release blog.

https://www.kitware.com/cmake-3-12-0-available-for-download/

[hjmallon]

New MRs will use a minimum required of 3.10 if it is a hard requirement as the 3.12 was hard to explain in the docs (cmake.rst). Arbitrary decision is fine for a soft requirement but feels like asking for trouble on a hard minimum version (even if it is unlikely there are many people using either <3.10 or <3.12 these days)

cpp-pm/gate#18
#769