The PGI compiler doesn't appear to like pointer arithmetic. It was

generating division by zero when using it. This change casts the
pointers to integers first and then does the subtraction.


git-svn-id: https://svn.mcs.anl.gov/repos/darshan/trunk@408 3b7491f3-a168-0410-bf4b-c445ed680a29

lib/darshan-mpi-io.c

@@ -1816,7 +1816,10 @@ static int cp_log_write(struct darshan_job_runtime* final_job, int rank,
     buf = pointers[0];
     for(i=0; i<count; i++)
     {
-        displacements[i] = (MPI_Aint)(pointers[i] - buf);
+        /* use this transform to be compiler safe */
+        uintptr_t ptr  = (uintptr_t) pointers[i];
+        uintptr_t base = (uintptr_t) buf;
+        displacements[i] = (MPI_Aint)(ptr - base);
     }
     DARSHAN_MPI_CALL(PMPI_Type_hindexed)(count, lengths, displacements,
         MPI_BYTE, &mtype);