[CMake] FindBLAS.cmake broken on macOS?

[Robin Verschueren]

Dear all,

I'm having difficulty making CMake find any BLAS on my macOS. I have two:

   1. OpenBLAS installed with homebrew:
   /usr/local/opt/openblas/lib/libopenblasp-r0.2.19.dylib
   2. System
   BLAS: /System/Library/Frameworks/Accelerate.framework//Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib

For (1.), I set BLA_VENDOR "OpenBLAS" as per the docs of FindBLAS.cmake.
CMake fails with *"A required library with BLAS API not found.  Please
specify library location."  *I fixed it with a kludge by

   - set(_libdir "/usr/local/opt/openblas/lib" CACHE INTERNAL "OpenBLAS
   location")

in the cache before calling FindBLAS. This violates all kinds of
principles, among which the fact that ${_libdir} is a local variable to the
FindBLAS module.

For (2.), FindBLAS actually finds something, however, the ${BLAS_LIBRARIES}
variable is set to *"/System/Library/Frameworks/Accelerate.framework"* which
is a folder and thus unusable in any IMPORTED targets.

Any advice? I did not find anything related in the open "FindBLAS" issues
on Gitlab.

Best regards,
Robin
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