add CMake support

[tukss]

This adds support for building Rayleigh using CMake. It is purely optional and does not interfere with the traditional, configure-based approach.

You can try it like this:

cmake -B build
cmake --build build -j

The rayleigh executable will be placed in build/src.

Todo:

• [x] Fix Run_Param_Header.F. The Fortran flags are currently missing. The linker flags have a SHELL: prefix.
• [x] Document CMake build procedure including how to make Debug and Release builds.
• [x] Test on more systems, in particular MKL based ones.
• [x] Add CI tests for the CMake build.
• [x] Install the executable in bin.

[gassmoeller]

Oh, I am glad I didnt make the PR ;-). Did you see https://github.com/geodynamics/Rayleigh/pull/281? I am not sure what we can use from there, but it is worth checking. I am happy to test this branch on my system.

[tukss]

Thanks for pointing that out. I've checked and I think the new CMake is already more advanced. In particular the handling of Run_Param_Headers.F and MPI.

[tukss]

As a bonus we get support for the new LLVM-based Intel ifx compiler for free.

[tukss]

It even works fine on Cray systems with the cray-fftw. The main thing I still want to try is pleiades.

[gassmoeller]

I tested the build on the NSF/TACC systems Stampede3 and Frontera, both use Intel compilers and MKL. I used Intel icc 19.1 on Frontera, and Intel 2024 (the new clang based) on Stampede3. Both worked fine, except I needed to load the fftw3 module.

[tukss]

I think this is ready now.

When I added the test, I got an error with the macOS tester because it passed -fallow-argument-mismatch to the clang compiler there. The problem goes away by switching to openmpi, which supports the F08 interface. I don't recall why we used mpich before but we should talk about that.

[tukss]

@feathern We have a changelog entry now. Feel free to merge it at any time.