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
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