Does STRUMPACK support the 'long double' data type?

[omgoooood]

No description provided.

[pghysels]

Unfortunately not.
Everything in STRUMPACK is templated on the scalar type, which can be float, double, std::complex<float> or std::complex<double>. These are the types supported by BLAS and LAPACK (and cuBLAS, cuSOLVER, MAGMA, ScaLAPACK, ...).
It would be possible in theory to add support for long double, but we'd need to implement certain BLAS and LAPACK routines in long double. This would be a lot of work, and performance will likely be poor.