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Our internal FFT routines have had support for directly using MKL for years. However, this was disabled when we moved to our modern CMake build system. This PR adds checks for MKL and if found does not look for FFTW. This works around the frequent issue where MKL ships with a partial FFTW interface and so linking to both libraries can break our code.
Tested on
cori.nersc.gov
with Intel compilers and MKL.