[MOAB-dev] SEEK_SET again

[Jed Brown]

Jason Kraftcheck wrote:
> So, if we were to define MPICH_IGNORE_CXX_SEEK, will MOAB compile without
> encountering this naming conflict for all of the following MPI 2.0
> implementations?
>   mpich
>   mvapich
>   intel
>   Microsoft
>   IBM
>   Cray
>   MX
>   Open MPI

MPICH and Open MPI work out of the box, regardless of whether that is
defined.  I don't know if the MPICH derivatives have their own names to
disable MPI::SEEK_* or if they respond to MPICH_IGNORE_CXX_SEEK.

I also noticed that the current hack does not do anything like what you
think it does (what the comments suggest) because macro expansion
doesn't work like that.

$ cat > broken.C
#include <stdio.h>
#include <MBParallelComm.hpp>
int main(void) {
  printf("SEEK_SET = %d\n",SEEK_SET);
  printf("MPI::SEEK_SET = %d\n",MPI::SEEK_SET);
  return 0;
}
$ /opt/mpich2/bin/mpicxx -c -o broken -DUSE_MPI -I/home/jed/usr/mpich/include broken.C
broken.C: In function ‘int main()’:
broken.C:4: error: ‘SEEK_SET_OLD’ was not declared in this scope
broken.C:5: error: ‘SEEK_SET_OLD’ is not a member of ‘MPI’


So it's equivalent to just #undef'ing them, except with a confusing
error message.

Jed

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