Hi, I want to be able to pass FC=mpif90 (or FC=$(which mpif90)) and CC=mpicc etc. OR also be able to pass a compiler and use FindMPI to add link, compile and include flags. I'm encountering an issue when my MPI implementation is not on my PATH, I want CMake to be able to look in an additional location (our build script can download and build MPICH and by default installs it in user space) and also resolve where mpif90 is coming from and look there too.
Whats the correct way to pass HINTS or PATHS to FindMPI? i.e., how do I specify additional locations to search? Using `find_package` with HINTS and PATHS means that it doesn't use FindMPI. I also tried setting CMAKE_SYSTEM PREFIX_PATH, but I think that's a cache variable set early, so it's not having an effect. It would be great if FindMPI used the realpath of mpif90 etc when passed as $FC. TIA
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