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Subject: [OMPI users] Open MPI error to define MPI_Datatype in header file
From: Jack Bryan (dtustudy68_at_[hidden])
Date: 2011-10-09 16:10:26

I need to define a (Open MPI) MPI_Datatype in a header file so that all other files that include it can find it.
I also try to use extern to do decleration in .h file and then define them in .cpp file.
But, I always get error:
undefined reference
It is not allowed in Open MPI ?
Why ?
Any help is really appreciated.