Numpy arm64

[nightscape]

No description provided.

[saudet]

It's not building for the arm64 architecture. You'll need to fix that

[nightscape]

@saudet afaiu, this PR depends on the cpython-arm64 PR getting merged and artifacts being published, right?
At least right now it seems to be failing because it can't resolve the cpython artifacts.

[saudet]

That's the one that isn't getting built for arm64

[nightscape]

Sorry, I think I'm not understanding something.
Have you had a look at #1373 ?
I introduced a cpython-arm64 build there and the corresponding Github action says it's building successfully.
Can we continue the discussion on #1373 ?

[saudet]

I see, let's work on that in another branch. I've merged what you had in the cpython branch, and it got deployed as snapshots.

[saudet]

Good news! We can use crossenv==1.4.0 to cross compile with CPython 3.11. I don't know if it works with Mac, but it works for Linux, see pull #1386, so please give it a try.

[saudet]

I've upgraded the builds for NumPy that now use Meson instead of distutils. It should make it easier to cross compile, so if you'd like to give it another shot: https://numpy.org/doc/stable/user/building.html#cross-compilation

[nightscape]

@saudet just to understand correctly (sorry if this is a stupid question):
You upgraded to a NumPy version that supports Meson, but (judging from my limited understanding of Meson that it would not use all these ..._PATH variables) the corresponding numpy/cppbuild.sh still uses the old build system, right?
Would I adapt the numpy/cppbuild.sh to use Meson for all platforms as described here?

[nightscape]

I fear I'm in way over my head here...
I'm trying to wrap my head around how all the Python, C and C++ build tools interact with each other, but I'm a spoiled little JVM child and don't seem to be able to understand all that stuff with LIB_PATHs, compiler flags, cross-compilation, ...

[saudet]

Meson probably doesn't need those paths, you can probably ignore them.

[saudet]

Looks like GitHub Actions now has free M1 runners. Want to give this a try again with that? https://github.blog/changelog/2024-01-30-github-actions-introducing-the-new-m1-macos-runner-available-to-open-source/