Add Fortran bindings about strumpack HOT 4 CLOSED

Thanks. Yes, we have some users who have expressed interest in a Fortran interface.

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Dear Seth,

Thank you for reaching out and apologies for the late reply. At the moment we do not have any Fortran interfaces. The StrumpackSparseSolver.h wrapper is a C interface to the C++ solver classes. This sometimes lags a bit behind the C++ interface. If ForTrilinos can work directly on the C++ interface, I think that would be better. The main interface for the sparse solver is in StrumpackSparseSolver.hpp.

The StrumpackSparseSolver.hpp interface can take DenseMatrix<scalar_t> arguments, but it doesn't have to, and can instead also take a simple scalar_t* and a leading dimension. We could use the simpler interface initially.

I will look into the ForTrilinos project.

from strumpack.

No problem for the delay! I thought from my conversation with Sherry that there was an initial effort to expose to Fortran but I must have misunderstood.

I think the work on ForTrilinos will provide a good starting point for this, since it too has matrix construction and manipulation. I'll whip up a demo some point in the next week or two and send it your way. Do you have any interested Fortran users, or is this an open-ended capability?

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For reference: the "flat" code in the PR was integrated into master in commit 8b62189

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