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Commit beafcfd3 authored by Mario Melara's avatar Mario Melara Committed by Todd Gamblin
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Set MPI environment variables to the compiler wrappers on Cray (#2762) 

* Set MPI[lang] env var to compiler wrappers on cray

Sets MPICC, MPICXX, MPIFC etc to point to the compiler wrappers on Cray systems.
Some packages look for MPIs via environment variables - e.g adios

* Use spec to check for Cray

* os is no longer used.
parent 6eed279f
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