This is the Makefile under swig-2.0.1/Examples/perl5/simple:
TOP        = ../..
SWIG       = $(TOP)/../preinst-swig
SRCS       = example.c
TARGET     = example
INTERFACE  = example.i
        $(MAKE) -f $(TOP)/Makefile SRCS='$(SRCS)' SWIG='$(SWIG)' \

I don't see anything that specifies the linking options there... perhaps that's what is supposed to be in SWIGOPT?

I also tried what I think was David's suggestion, and did the following:
swig -c++ -perl5 example.i
g++ -c example.cpp example_wrap.cxx `/usr/bin/perl -MExtUtils::Embed -e ccopts`
g++ `/usr/bin/perl -MExtUtils::Embed -e ccopts` -o example.dylib example.o example_wrap.o

I got a whole stack of errors as a result, starting with "Undefined symbols for architecture x86_64".

Any other suggestions?


On Dec 15, 2010, at 9:37 AM, Sri wrote:

I dont have experience with Mac, but I normally match the build flags used in building the example provided in swig's source distribution.  If you can build that successfully, it may give you some clues.  I cant lookup the exact path now, but its something like  <your swig source root>/examples/perl5/

From: Michael Hearne <>
Sent: Wed, December 15, 2010 9:51:29 PM
Subject: [Swig-user] Compiling Perl library on Mac OS 10.6

I'm having trouble compiling a Perl dynamic library on a Mac OS 10.6 laptop.  I found the following presentation on-line:

I used the example code found there to build a .dylib dynamic library.  When I try to run the example Perl script given there, I get the following error message:

Can't load './example.dylib' for module example: dlopen(./example.dylib, 1): no suitable image found.  Did find:
    ./example.dylib: mach-o, but wrong architecture at /System/Library/Perl/5.10.0/darwin-thread-multi-2level/ line 207.
at line 11
Compilation failed in require at ./ line 6.
BEGIN failed--compilation aborted at ./ line 6.

I've tried a couple of other examples of building Perl modules with SWIG, but none of them seem to work.  Does anyone have a recent example of building ANY simple Perl module using SWIG on Mac OS 10.6, with the correct linking commands included?

The details of my attempt are below:
/* Example.h */

#include <vector>
#include <string>

#define PGSd_EOS_AM        2222      
#define PGSd_EOS_PM        3333

double average(std::vector<int> v);

std::vector<double> half(const std::vector<double> & v);

std::string TestMod(const std::string &s); 

//  example.cpp
#include <algorithm>
#include <functional>
#include <numeric>
#include "example.h"

using namespace std;

double average(vector<int> v) {  return (accumulate(v.begin(), v.end(), 0.0))/v.size();}

vector<double> half(const vector<double> & v) {
        vector<double> w(v);
        for( unsigned long i = 0; i < w.size(); i++)
                w[i] /= 2.0;
        return w; }

std::string TestMod(const std::string &s)  {return string("TestOutput: ") + s;} 

%include "exception.i"
%exception {

    try {
        } catch (const std::exception &e) {
        SWIG_exception_fail(SWIG_RuntimeError, e.what());

%module example
/* Put headers and other declarations here */
#include "example.h"

%include "std_vector.i"
%include "std_string.i"

%template(IntVector) std::vector<int>;
%template(DoubleVector) std::vector<double>;
%include "example.h"

Build commands:
swig -c++ -perl5 example.i
g++ -c example.cpp example_wrap.cxx `/usr/bin/perl -MExtUtils::Embed -e ccopts`
g++ -dynamiclib  -single_module -flat_namespace -undefined suppress -o example.dylib example.o example_wrap.o

The results of `/usr/bin/perl -MExtUtils::Embed -e ccopts` are:
-arch x86_64 -arch i386 -arch ppc -g -pipe -fno-common -DPERL_DARWIN -fno-strict-aliasing -I/usr/local/include -I/System/Library/Perl/5.10.0/darwin-thread-multi-2level/CORE

The results of running "file example.dylib":
Mach-O 64-bit dynamically linked shared library x86_64

I looked at another .dylib file on my system and saw that it contained code for three architectures:
/System/Library/Perl/Extras/5.10.0/darwin-thread-multi-2level/lib/libsvn_swig_perl- Mach-O universal binary with 3 architectures
/System/Library/Perl/Extras/5.10.0/darwin-thread-multi-2level/lib/libsvn_swig_perl- (for architecture x86_64):    Mach-O 64-bit dynamically linked shared library x86_64
/System/Library/Perl/Extras/5.10.0/darwin-thread-multi-2level/lib/libsvn_swig_perl- (for architecture i386):    Mach-O dynamically linked shared library i386
/System/Library/Perl/Extras/5.10.0/darwin-thread-multi-2level/lib/libsvn_swig_perl- (for architecture ppc7400):    Mach-O dynamically linked shared library ppc
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