On Jun 23, 2011, at 1:39 AM, Martin Schulz wrote: In another sense, if we mandate specific symbols for mpif.h/use mpi, we might break some tools, but put ourselves in a better place for the future. Since a tool already has to sense which back-end symbol to use mpif.h/use mpi (lower case, caps, 1 underscore, 2 underscores -- none of which are mandated by the Fortran spec, by the way; it's just common convention), is it really a hardship to add another symbol name to check during the tools configuration/building mechanism? I am more worrying about existing tools - those would all have to be changed. Martin Could you comment on the possibility of deprecating what is essentially the current mpif.h tool access. -craig