[Numpy-discussion] Disallow Accelerate as a LAPACK backend for NumPy

[Matti Picus]

Apple has dropped support for Accelerate. It has bugs that have not been 
fixed, and is closed source so we cannot fix them ourselves. We have 
been getting a handful of reports from users who end up building NumPy 
on macOS, and inadvertently link to Accelerate, then end up with wrong 
linalg results. In PR 14880 https://github.com/numpy/numpy/pull/14880 I 
propose to disallow finding it when building NumPy. At this time it will 
remain in distutils as one of the backends to support users, but how do 
people feel about a future PR to totally remove it?

Matti

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