build systems: cmake, bazel, meson, ...

[Niek Bouman]

> Nadav wrote (in a github PR):

> By the way, when you have some experience on bazel vs cmake, I'll be happy if you share it on the Seastar developer mailing list (does anyone still use that? :-( ). I never managed to become a cmake fan, and people keep telling me I'm wrong and cmake is great and the best thing since sliced bread - but I still failed to be come a fan... So I wonder if maybe I wasn't wrong all along and there's indeed something (bazel or anything else) that people like even better than cmake.

3,5 years ago, I wrote a blog post about our migration from CMake to meson.
Although its age, most of the post's opinions are still relevant today:

https://niekbouman.medium.com/c-build-systems-our-transition-from-cmake-to-meson-2c043e93822f

One thing to note is that meson does not yet support C++20 modules, which seems to be related to the desire of the meson developers to make a scalable implementation, which seems hard given the api of certain compilers, as explained here (which is a fun read): 

https://nibblestew.blogspot.com/2023/12/on-scalability-of-c-module.html

@Tyler Rockwood: Did you at RedPanda consider other build systems (than cmake, bazel) as well?

best,

Niek

[Noah Watkins]

Niek,

Redpanda is nearing completion of its migration to Bazel. Here are the relevant Seastar bits https://github.com/redpanda-data/redpanda/blob/dev/bazel/thirdparty/seastar.BUILD.

- Noah

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