Increase required CMake version to 3.16

Increase CMake version to 3.16. This was a decision from Dune developer meeting 2022, see https://dune-project.org/community/meetings/2022-02-devmeeting/#minimum-versions-of-gcc-clang-cmake-python

Looks good to me. Just for our documentation: what are the linux distribution limitations that we have with this?

• debian buster (10): 3.13.4
• debian bullseye (11): 3.18.4
• ubuntu focal (20.04): 3.16.3

Since we drop support of debian 10 step by step and it is still possible to install cmake in any newer version by just using the apt repository of kitware directly or using pip (several ways to install a new cmake are described on our webpage), it is still no problem to compile dune on that older debian version. Same for older ubuntu <= 18.04.

What we should update is the duneproject script. There in the generated README it says cmake >= 3.13

added 9 commits

• ff35fabf...1437ba8a - 5 commits from branch master
• a3867722 - [cmake] Increase required CMake version to 3.16
• 40eaf547 - [cmake] Deprecate message_verbose
• d764df99 - [cmake] Don't use deprecated message_verbose
• f58c7cce - [cmake] duneproject's project template require CMake 3.16

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changed title from Feature/increase required cmake version to Increase required CMake version to 3.16

added 5 commits

• 4914db3a - [cmake] Increase required CMake version to 3.16
• 5727670a - [cmake] Deprecate message_verbose
• a7f9996f - [cmake] Don't use deprecated message_verbose
• 681ef862 - [cmake] duneproject's project template require CMake 3.16
• 36e7dd02 - [python] Increase CMake version to 3.16 in various Python-related places

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resolved all threads

mentioned in issue #353 (closed)

added 1 commit

• 31f0bfe0 - [cmake] Remove handling of CMP0087 and CMP0094

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added buildsystem label

mentioned in merge request staging/dune-uggrid!226 (merged)

mentioned in merge request dune-geometry!226 (merged)

mentioned in merge request extensions/dune-alugrid!169 (merged)

added 1 commit

• a6eda3f0 - [doc][cmake] Update CMake required version in build system doc

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If I did it correctly this https://github.com/dune-project/dune-testpypi/actions/runs/6722545766 should run some additional Python setup tests with this branch.

approved this merge request

merged

mentioned in commit a3ea3db6