[Swig-user] Issue with compiling SWIG C++ to Python wrapper

[Carlos L. <ca...@aa...>]

I'm not sure if this is the right place to ask, but I'm not sure where else to look. I went on Stack Overflow ( http://stackoverflow.com/questions/29358095/issue-with-undefined-symbol-main-when-compiling-swig-wrapper ) but haven't received an answer.

I'm on Mac OS X 10.10.2 (64-bit) and I have the swig and swig-python packages installed through MacPorts, as well as Xcode and the command line tools installed.

I'm trying to create a wrapper from the Steamworks C++ API to Python. I have the following interface file (steamworks.i):

%module steamworks
%{
#define SWIG_FILE_WITH_INIT
#include "/Users/aarzee/Documents/steamworks-sdk/public/steam/steam_api.h"
%}

I'm running these commands:

swig -c++ -python steamworks.i
g++ -O2 -fPIC -c steamworks_wrap.cxx -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7
g++ -L/Users/aarzee/Documents/steamworks-sdk/redistributable_bin/osx32 -lsteam_api -lpython steamworks_wrap.o

The first two commands seem to work fine, but when I do the second g++ invocation, I get this error:

Undefined symbols for architecture x86_64:
  "_main", referenced from:
     implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

I did a little research on this and it seems that this can be caused by premature linking, but I am using the -c option in the first g++ invocation.

Any help would be appreciated.

 - CL