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Subject: Re: [OMPI users] Open MPI and Objective C
From: Ralph Castain (rhc_at_[hidden])
Date: 2011-09-19 08:34:34


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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