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NVIDIA HPC SDK compiler support

Nvidia released a free-to-use HPC SDK that includes C, C++ and Fortran compilers. At first glance of the HPC SDK user manual, the command line options look very similar to the PGI compilers the HPC SDK replaces, with compiler names

nvc
nvc++
nvfortran

To implement these compilers at first glance looks to require edits to:

Modules/CMakeDetermineFortranCompiler.cmake
Modules/FindMPI.cmake

Just wanted to share these initial findings as I didn't have time to implement at the moment, but others in scientific computing may be looking to use CMake with HPC SDK compilers.

Edited by scivision
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