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!

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
   //*** end
   NSLog(@"Executing open MPI Objective C");



[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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