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@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@julian.tau.ac.il 69978 Tel Aviv, Israel WWW: http://julian.tau.ac.il/bqs
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Jeff Hammond
jeff.science@gmail.com
http://jeffhammond.github.io/