[mpich-discuss] Mac OS X version of Mpich

[Jeff Hammond]

See below where you got a warning for defining MPI to 1?  That is going to
break EVERYTHING in the MPI C code.  Consider the declaration
MPI_Init_thread.  It will become 1_Init_thread.  This is a serious problem.

The MPI standard reserves the MPI namespace.  You cannot use it.  In your
case, you took the entire namespace and changed it to a number :-)

Please use a preprocessor macro like USE_MPI in your application.  Do not
define any symbols anywhere that being with MPI.

Related: http://lists.mpich.org/pipermail/devel/2013-November/000274.html.
It's the number 1 google hit for me and the first response is the correct
answer.

Best,

Jeff

On Tue, Aug 18, 2015 at 11:39 PM, Benjamin Svetitsky <bqs at julian.tau.ac.il>
wrote:

> Greetings MPICH experts,
>
> I've run code with MPICH often on my Macbook Pro (4 cores), but not
> lately.  Recently I updated MPICH from Macports, preparing for new
> running.  Now my code doesn't compile.  Do you know this error message:
> ------
> mpicc -c -O3   -DMPI -DPRECISION=2 -I. -DNHYP -DLU ../generic/com_mpi.c
> In file included from ../generic/com_mpi.c:104:
> /opt/local/include/mpich-clang37/mpi.h:116:56: error: expected identifier
> static const MPI_Datatype mpich_mpi_char             MPICH_ATTR_TYPE_T...
>                                                      ^
> /opt/local/include/mpich-clang37/mpi.h:24:106: note: expanded from macro
>       'MPICH_ATTR_TYPE_TAG'
>   ...__attribute__((type_tag_for_datatype(MPI,type)))
>                                           ^
> <command line>:1:13: note: expanded from here
> #define MPI 1
>             ^
> -----
> and then there is a sequence of similar messages, all regarding mpi.h.
> The compilation halts after 20 messages.
>
> I originally tried this with mpich-default, with the same result.  I
> wondered if it had to do with an incompatibility with clang, so I installed
> mpich-clang37 @3.1.4_1+gcc49, with the above result.
>
> The same code still runs on current MPICH and MVAPICH installations on
> several systems.
>
> Thanks for your help,
> Ben
>
>
> --
> Prof. Benjamin Svetitsky          Phone:            +972-3-640 8870
> School of Physics and Astronomy   Fax:              +972-3-640 7932
> Tel Aviv University               E-mail:      bqs at julian.tau.ac.il
> 69978 Tel Aviv, Israel            WWW:  http://julian.tau.ac.il/bqs
>
>
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-- 
Jeff Hammond
jeff.science at gmail.com
http://jeffhammond.github.io/
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