Re: [OMPI users] Open MPI and Objective C

[Beatty, Daniel D CIV NAVAIR, 474300D]

Greetings Scott,
The NSLog call should be no big deal since it is provided by the Cocoa 
frameworks and is inherent to Objective C.  

The mpicc compiler may be a different thing.   It may not recognize that it 
supposed to be calling gcc to compile in Objective-C mode and not in pure ISO 
C-99.   I will have look up in my notes to recall the instructions necessary to 
make regular gcc or clang to compile properly with MPI.

The extension is fine, so I would think that gcc should go into Objective-C 
mode.   I think MacResearch has an example on their site that could help.

Good luck,

Daniel D. Beatty
Computer Scientist, 474300D
Detonation Sciences Branch
On detail for Land Range Data Systems Branch
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-----Original Message-----
From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On Behalf 
Of Ralph Castain
Sent: Monday, September 19, 2011 5:35
To: Open MPI Users
Subject: Re: [OMPI users] Open MPI and Objective C

Nothing to do with us - you call a function "NSLog" that Objective C doesn't 
recognize. That isn't an MPI function.

On Sep 18, 2011, at 8:20 PM, Scott Wilcox wrote:


        I have been asked to convert some C++ code using Open MPI to Objective 
C and I am having problems getting a simple Obj C program to compile.  I have 
searched through the FAQs and have not found anything specific.  Is it an 
incorrect assumption that the C interfaces work with Obj C, or am I missing 
something?

        Thanks in advance for your help!
        Scott


        open MPI version: 1.4.3
        OSX 10.5.1

        file: main.m

        #import <Foundation/Foundation.h>
        #import "mpi.h"

        int main (int argc, char** argv)

        {
           //***
           // Variable Declaration
           //***
           int theRank;
           int theSize;


           //***
           // Initializing Message Passing Interface
           //***
           MPI_Init(&argc,&argv);   
           MPI_Comm_size(MPI_COMM_WORLD,&theSize);   
           MPI_Comm_rank(MPI_COMM_WORLD,&theRank);
           //*** end


           NSLog(@"Executing open MPI Objective C");

        }

        Compile:

        [87]UNC ONLY: SAW>mpicc main.m -o test
        Undefined symbols:
          "___CFConstantStringClassReference", referenced from:
              cfstring=Executing open MPI Objective C in ccj1AlL9.o
          "_NSLog", referenced from:
              _main in ccj1AlL9.o
        ld: symbol(s) not found
        collect2: ld returned 1 exit status
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