The return is 0 or 1 so an int it's enought. Thanks Brian for catching this one.

This commit was SVN r8504.

ompi/datatype/convertor.h

@@ -260,12 +260,12 @@ ompi_convertor_generic_simple_unpack( ompi_convertor_t* pConvertor,
                                       size_t* max_data,
                                       int32_t* freeAfter );
 
-    /*
-     *
-     */
-    OMPI_DECLSPEC int32_t
-    ompi_convertor_generic_simple_position( ompi_convertor_t* pConvertor,
-                                            size_t* position );
+/*
+ *
+ */
+OMPI_DECLSPEC int
+ompi_convertor_generic_simple_position( ompi_convertor_t* pConvertor,
+                                        size_t* position );
 
 #if defined(c_plusplus) || defined(__cplusplus)
 }