build: use cmake build system in fastjet and fastjet-contrib

[lgray]

This branch will be where we figure out pip install . and cibuildwheel for scikit-hep/fastjet using the in-progress cmake build branches for fastjet/siscone/fastjet-contrib.

I need to get the fastjet-contrib edits into a github repository so we can submodule it correctly.
Right now I have it working locally from the fastjet-contrib svn repository + patches.

At least on my laptop I can get the scikit-hep/fastjet extension compiling and linking.
It doesn't yet function at runtime, but it's only a matter of time.

I'll send some further notifications when it's ready for a more serious look.

One thing we need to solve:

• MACOSX_DEPLOYMENT_TARGET=11.0 (instead of 14.0/13.0 which is what gets us all green right now)

@matthewfeickert @henryiii

[lgray]

OK - the present setup builds on my mac using the following commands:

git clone [email protected]:scikit-hep/fastjet.git -b cmake-build-work --recursive
cd fastjet
mkdir build
cmake -S . -B build -DCMAKE_BUILD_TYPE="Release" -DFASTJET_ENABLE_PYTHON=ON -DFASTJET_ENABLE_CGAL=ON -DFASTJET_PYTHON_PACKAGE_NAME=fastjet_cxx
cmake --build build --clean-first --parallel
cd build
python -c 'import _ext; print(_ext)'

Depending on your circumstances you may need to specify pybind11_DIR or turn off CGAL (I have it in from conda).

I'm gonna leave it at that for now y'all can feel free to poke around on the PR with additions, etc.

[lgray]

OK - cool so now it's at least compiling (but not finishing the install!) with scikit-build-core. CGAL is on in all the cases, installed via system libs.

The errors I'm seeing don't make a lot of sense, so would now definitely appreciate help in getting the CI green again :D

[lgray]

hmmm it would be nice to be able to browse the packages available in manylinux online.

anyway leaving it here for now. more than decent progress.

[lgray]

@henryiii

git clone [email protected]:scikit-hep/fastjet.git -b cmake-build-work --recursive
cd fastjet
pip install . -vv
python -c 'import fastjet; print(fastjet)'

[lgray]

I'm also not sure what's up with this metadata error in the CI install. This doesn't happen locally.

[lgray]

[lgray]

Now that that particularly angry yak is shaved. Let's clean this up and ship it. :-) (after the fastjet/siscone/fastjet-contrib releases, etc.)