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Subject: Re: [OMPI users] Open MPI error to define MPI_Datatype in header file
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2011-10-10 09:58:20


You'll need to be a bit more specific. What describe should work fine.

foo.h:
extern MPI_Datatype mydtype;

foo.cc:
#inlclude "foo.h"
MPI_Datatype mydtype;

bar.cc:
#include "foo.h"
void bogus(void) {
  MPI_Datatype foo = mydtype;
}

On Oct 9, 2011, at 4:10 PM, Jack Bryan wrote:

> Hi,
>
> 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.
>
> Thanks
> _______________________________________________
> users mailing list
> users_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/users

-- 
Jeff Squyres
jsquyres_at_[hidden]
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