First step on supporting full external32 conversion on both operations

pack and unpack.

This commit was SVN r12299.

ompi/datatype/convertor.h

@@ -39,7 +39,7 @@ extern "C" {
  */
 /* keep the last 16 bits free for data flags */
 #define CONVERTOR_DATATYPE_MASK    0x0000FFFF
-#define CONVERTOR_USELESS          0x00010000
+#define CONVERTOR_SEND_CONVERSION  0x00010000
 #define CONVERTOR_RECV             0x00020000
 #define CONVERTOR_SEND             0x00040000
 #define CONVERTOR_HOMOGENEOUS      0x00080000

ompi/mpi/c/pack_external.c

@@ -58,9 +58,14 @@ int MPI_Pack_external(char *datarep, void *inbuf, int incount,
 
     OBJ_CONSTRUCT(&local_convertor, ompi_convertor_t);
 
-    /* The resulting convertor will be set to the position zero */
+    /* The resulting convertor will be set to the position zero. We have to use
+     * CONVERTOR_SEND_CONVERSION in order to force the convertor to do anything
+     * more than just packing the data.
+     */
     ompi_convertor_copy_and_prepare_for_send( ompi_mpi_external32_convertor,
-                                              datatype, incount, inbuf, 0, &local_convertor );
+                                              datatype, incount, inbuf,
+                                              CONVERTOR_SEND_CONVERSION,
+                                              &local_convertor );
 
     /* Check for truncation */
     ompi_convertor_get_packed_size( &local_convertor, &size );

ompi/mpi/c/pack_external_size.c

@@ -52,7 +52,9 @@ int MPI_Pack_external_size(char *datarep, int incount,
 
     /* the resulting convertor will be set to the position ZERO */
     ompi_convertor_copy_and_prepare_for_send( ompi_mpi_external32_convertor,
-                                              datatype, incount, NULL, 0, &local_convertor );
+                                              datatype, incount, NULL,
+                                              CONVERTOR_SEND_CONVERSION,
+                                              &local_convertor );
 
     ompi_convertor_get_packed_size( &local_convertor, &length );
     *size = (MPI_Aint)length;