Should set `BLA_VENDOR` in CMakeMake easyblock if BLAS is in the toolchain

[ocaisa]

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The logic for this is already used in https://github.com/easybuilders/easybuild-easyblocks/blob/develop/easybuild/easyblocks/s/superlu.py#L66

This logic is outdated though and should be updated to include FlexiBLAS and OpenBLAS (if the CMake version is recent enough)

[boegel]

See https://cmake.org/cmake/help/latest/module/FindBLAS.html .

Looks like it's not that trivial for imkl...

[ocaisa]

I think in the case of MKL we could accept that we can't do it, but in the other cases we should set it to force picking up the right library

[ocaisa]

Actually one way to address would be to use Intel10_64_dyn and let MKL decide what to do at runtime. This would probably mean changes in how we link to MKL though (which is already being used at JSC I think).

[migueldiascosta]

this would also help in less clean systems where the wrong BLAS/LAPACK are picked up, was just bitten by that, this helped:

if get_software_root("flexiblas"):
    self.cfg.update('configopts', '-DBLA_VENDOR=FlexiBLAS')

seems innocuous enough?

[boegel]

@migueldiascosta It would make sense, but we should definitely broadly test a change like that.