Robot Framework complains SWIG generated python file contains no keywords - swig

Question

I'm using SWIG to generate wrapper from C++ for Robot Framework as test library. RF issues a warning because it contains no keywords.
The system under test is a Win32 DLL, LibLogin2, created by VS wizard. It exports the function by default:
LIBLOGIN2_API int fnLibLogin2(void);
// This is an example of an exported function.
LIBLOGIN2_API int fnLibLogin2(void)
{
return 42;
}
I add interface file to the project:
/* LibLogin2.i */
%module LibLogin2
%{
extern int fnLibLogin2(void);
%}
extern int fnLibLogin2(void);
LibLogin2.py, LibLogin2_warp.cxx, _LibLogin2.pyd are built successfully with Release|x64.
I have a RF test case as follows:
*** Settings ***
Library LibLogin2.py
*** Test Case ***
Trivial
${value} = fnLibLogin2
Should Be Equal ${value} ${42}
I launch Robot Framework and get THE error:
pybot LoginTests.tsv
[ WARN ] Imported library 'LibLogin2.py' contains no keywords
I can work around this by commenting out the last line of LibLogin.py:
def fnLibLogin2():
return _LibLogin2.fnLibLogin2()
#fnLibLogin2 = _LibLogin2.fnLibLogin2
It's annoying when you have to comment out every key word every time.
Please advice!
Here is my configuration:
Windows 8 64-bit
Visual Studio 2012
Python 2.6.6
Robot Framework 2.7.5
swigwin-2.0.8