CI for MSVC (BLAS and LAPACK libraries) #825
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Be more careful not to mix binaries that have been built with different OpenMP implementations. Intel MKL is linked against libiomp5md. But these runners build with MSVC `cl` or LLVM `clang-cl`, respectively. I.e., they are linking against the MS implementation or the LLVM implementation of OpenMP, respectively. That is dangerous, since it can degrade performance or cause incorrect results. Avoid that issue by linking against the reference implementations of the BLAS and LAPACK libraries that don't use OpenMP at all.
CI (MSVC): Install reference BLAS and LAPACK libraries.
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