Make -Dwith-mpi respect provided path and ensure "default off" options are turned on only by explicit ON #3148
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Unify the handling of CMake options and explicitly check the contents of variables.
To be more precise:
OFFcould previously be turned on by any non-empty string. NowONis explicitly required.-Dwith-mpi=/opt/localwould not make CMake look for MPI in/opt/local, it would search in default locations. Now it respects the path given.This is a replacement for #3112.