Core dump in SWIG 1.3.17 - (newbie)

I am a newbie to SWIG. Here is my problem:

What is the equivalent of -
1. extern const xint8_t *<parameter> = "<value>"
and
2. the corresponding "typemap" statement
in the following piece of code under SWIG1.3.17?

For your information, the following code used to work
properly under SWIG 1.1p5.
=============================
%typemap(python, out) xint8_t**
{
    xint32_t len=0;

    while($source[len]) len++;
    $target = PyList_New(len);

    for(xint32_t i=0;i<len;i++)
        PyList_SetItem($target, i, PyString_FromString($source[i]));
}

extern const xint8_t *pyBlack = "K";
extern const xint8_t *pyBlackLow = "KL";
extern const xint8_t *pyGreyScale = "Grey";
=============================

With the above codes, under SWIG 1.3.17, I could get
*_wrap.cxx file with the required C++ methods. But,
it does NOT generate any statements in the corresponding
python file. I was expecting the following lines in
the generated python file:
---------------------
pyBlack = _module.pyBlack
pyBlackLow = _module.pyBlackLow
pyGreyScale = _module.pyGreyScale
---------------------

Whereas the above lines exist with SWIG 1.1p5 generated
python files.

If I use the following statements instead of the
above three "extern" statements (without typemap statement),
I am getting a "Segmentation fault(Core dumped)" though
I could get the above three lines in the python file
generated under SWIG 1.3.17.
=======================================
%constant xint8_t *pyBlack = "K";
%constant xint8_t *pyBlackLow = "KL";
%constant xint8_t *pyGreyScale = "Grey";
=======================================

Please reply me at the earliest.

- Sharma K M

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