FindMPI warns if any language is disabled
The reasons given by FindMPI are somewhat strange:
find_package( MPI COMPONENTS CXX OPTIONAL_COMPONENTS )
(with disabled fortran) can produce the error message:
Could NOT find MPI (missing: MPI_CXX_FOUND CXX) Reason given by package: MPI component 'Fortran' was requested, but language Fortran is not enabled.
Which indicates that Fortran is requested, but not enabled.
Possibly, the error messages should be made clearer.
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