Implements builds for Apple Silicon

This MR introduces support for building our packages on Apple Silicon. We currently use the M1-macmini available.

changed the description

We are apparently missing a few packages for this architecture:

Encountered problems while solving:
    - nothing provides requested mkl 2020.4.*
    - nothing provides requested pyqt 5.12.3
    - nothing provides requested sox 14.4.2
    - nothing provides requested libblitz 1.0.2

Well, for obvious reasons, intel-mkl should not be available on M1 macs. @amohammadi: do you understand why it's been picked up? (solved!)

pyqt and sox are not available on the specified versions. What to do here?

Finally, I think we are the maintainers of libblitz - @amohammadi: can you enable builds for osx-arm64?

For pyqt, we are stuck until Qt can be compiled on osx-arm64: https://github.com/conda-forge/pyqt-feedstock/issues/101

For sox, a similar issue is not even opened so far on https://github.com/conda-forge/sox-feedstock

added 2 commits

• f1607889 - 1 commit from branch master
• 511aff08 - Implements builds for Apple Silicon

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Issues to track:

• libblitz: https://github.com/conda-forge/libblitz-feedstock/issues/18
• sox: https://github.com/conda-forge/sox-feedstock/issues/23
• pyqt: https://github.com/conda-forge/pyqt-feedstock/issues/101 -> blocked on qt: https://github.com/conda-forge/qt-feedstock/pull/206 (qt=5.15.2)

@amohammadi: something is fishy with the way we test "bob-devel" here. I added a selector for mkl to intel machines only. However, "bob-devel" insists in using all packages after the # AUTOMATIC PARSING START, even the ones with selectors. Can you please have a look? Thanks!

I don't see any modification on bob-devel here, where did you add this mkl selector?

I put it at the conda build config. Wasn’t it the right place?

you haven't pushed it here.

You are right - I mistakenly pushed this mod to master, and then rebased here. You can have a look at this commit: f1607889

please revert that in master

Why?

because the changes here are not ready and I don't want to have half of the changes already in master.

added 5 commits

• 511aff08...f78bc4ad - 3 commits from branch master
• 4d82d646 - Implements builds for Apple Silicon
• 917d94dd - Revert "Revert "[conda_build_config] Only install mkl on intel processors""

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There, @amohammadi

Thank you.

added 1 commit

• 44bf12a4 - [conda_build_config] Only install mkl on intel processors (avoid definition of mkl variable)

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resolved all threads