BLD: Win arm64 adding openblas to gh build #27410
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| open_blas_link: "https://woastorage.blob.core.windows.net/packages/openblas/openblas_v0.3.27.zip" | |||
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Unfortunately I think this might be a security hazard, linking against a binary blob whose provenance we can't keep track of.
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Ok. I expected similar response, but I wanted to check what do you think about this, as I couldn't find appropriate Fortran cross compiler binary. This is the reason I extracted the link to be obvious, and hoped that maybe linaro would be acceptable as they are driving windows arm changes all across the open source community.
Gcc toolchain for cross-compilation should be available in a few months, but that would be the time when native builders would become available. In fact native Win and Linux arm64 runners should already be available for some customers, but I am not sure what is the NumPy community billing plan, and I have free GitHub account so I cannot see those.
I compiled the version of the flang-new and added a few additional binaries to make it work, but this build is taking several hours so it is not a solution for the NumPy. I also built win arm64 openblas natively to test the performance but that is also not a solution here.
I will try to rethink if there is some different solution.
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Maybe it would be more appropriate to discuss this at https://github.com/MacPython/openblas-libs. That is where the scipy-openblas wheels are built. We already cross-compile under a qemu docker for aarch64 (which takes over 2 hours), we could do something similar for arm64-windows if there is a way to do that.
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How is the linaro project building OpenBLAS? Maybe they could contribute the recipes to OpenBLAS and the wheel building MacPython/openblas-libs? |
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Thanks @Mousius. That seems to be a one-line (or almost one-line) build. How would we set up the clang-cl environment so it would cross-compile using that recipe for arm64 on a x86_64 host, including finding fortran compilers? |
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Btw, there is a noblas build #28836 on the new native arm64 windows hosts. |
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This is now completely supported after gh-29039, so I will close this PR. Thank you for your contribution @SlobodanMiletic |
Adding openblas to the git hub build of windows arm64 wheel. This is temporary solution until the native builds become available.
As there is still no appropriate fortran cross-compiler that is needed for openblas this build is using prebuilt openblas binaries built by linaro project (linaro organization is currently driving the changes needed for win arm64). When scipy-openblas becomes available build can be changed to link with it