Handle Cray compilers when detecting MPI include paths and libs (!4175) · Merge requests · PETSc / petsc · GitLab

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Junchao Zhang requested to merge jczhang/fix-cray-mpicxx-includes/main into main Jul 17, 2021

Cray cc does not support -show, so I have to deal with it specially.
MPICXX does not necessarily exist and is not needed for a PETSc + Kokkos build, so we should detect MPI paths with MPICC