CMake: why minimum required version v3.30.5?

[mayrmt]

I am wondering, why we require our CMake minimum version to be 3.30.5. This version needs to be installed manually on Ubuntu 24.04 systems, since its package manager only delivers v3.28.

Do we actually use any features of v3.30.5?

[maxfirmbach]

My first question would be: "Why not use it?". Should we use v3.28 because it's the default on that OS out of convenience? Which for sure is a valid point. The problem is that if one uses Ubuntu 22.XX or Ubuntu 24.10, that assumption might not hold true anymore. If one would spin it further and go to other distributions of e.g. Linux ... well were does supporting of something start and end.

[mayrmt]

Sure! In the end, it might always happen that one has to install it manually. I am asking for the pure reason of convenience. We run everything on Ubuntu 24.04 and always have to manually instal CMake.

https://github.com/trilinos/Trilinos/blob/fc8b0561871d5092aae01aa4a425729dc4471538/CMakeLists.txt#L7

[davidrudlstorfer]

What version is Trilinos using? In the original PR https://gitlab.lrz.de/baci/baci/-/merge_requests/2608 nearly one year ago it was stated that it will also switch to 3.30 soon.

[mayrmt]

Trilinos uses 3.23. Apparently, they did not update as expected.

[maxfirmbach]

I‘m fine with going back to v3.28 if necessary.