Segfaults and debug builds

Hello,

Testing some code recently I've started getting segfaults deep inside 
wxPython. The start of a backtrace looks like this:

#0  0x00007ffff6f7a676 in strlen () at ../sysdeps/x86_64/strlen.S:106
#1  0x00005555556248f4 in PyString_FromString (str=0x4e2566254e256125 
<error: Cannot access memory at address 0x4e2566254e256125>) at 
../Objects/stringobject.c:121
Python Exception <class 'UnicodeDecodeError'> 'utf-8' codec can't decode 
byte 0xf7 in position 3: invalid start byte: 
#2  0x0000555555629784 in PyDict_SetItemString (v=, key=<optimized out>, 
item=<sip.methoddescriptor at remote 0x7fffe4cf4290>) at 
../Objects/dictobject.c:2518
Python Exception <class 'UnicodeDecodeError'> 'utf-8' codec can't decode 
byte 0xf7 in position 3: invalid start byte: 
#3  0x00007fffea5d3e3f in addMethod (dict=, pmd=0x7ffff705f008) at 
../../../../sip/siplib/siplib.c:6959
Python Exception <class 'UnicodeDecodeError'> 'utf-8' codec can't decode 
byte 0xf7 in position 3: invalid start byte: 
#4  0x00007fffea5d3ed6 in add_lazy_container_attrs (td=0x7ffff728f180 
<_nl_C_LC_ADDRESS>, cod=0x7ffff728f1b0 <_nl_C_LC_ADDRESS+48>, dict=) at 
../../../../sip/siplib/siplib.c:6986
#5  0x00007fffea5d437f in add_lazy_attrs (td=0x7ffff7291f38 
<main_arena+1080>)
    at ../../../../sip/siplib/siplib.c:7129
#6  0x00007fffea5d445c in add_all_lazy_attrs (td=0x7ffff7291f38 
<main_arena+1080>)
    at ../../../../sip/siplib/siplib.c:7160
#7  0x00007fffea5d6610 in sip_api_is_py_method (gil=0x7fffffffc3c4, 
pymc=0x7fffffffc3c3 "", sipSelf=0x555556806ca0, cname=0x0, 
mname=0x7fffea5df860 "__dtor__") at ../../../../sip/siplib/siplib.c:8516
#8  0x00007fffea5d24e5 in callPyDtor (self=0x555556806ca0) at 
../../../../sip/siplib/siplib.c:6025
#9  0x00007fffea5d2373 in sip_api_common_dtor (sipSelf=0x555556806ca0)
    at ../../../../sip/siplib/siplib.c:5975
#10 0x00007ffff637e640 in sipwxScrolledWindow::~sipwxScrolledWindow() 
(this=0x5555565ca568, __in_chrg=<optimized out>) at 
../../../../sip/cpp/sip_corewxScrolledWindow.cpp:151
#11 0x00007ffff637e670 in sipwxScrolledWindow::~sipwxScrolledWindow() 
(this=0x5555565ca568, __in_chrg=<optimized out>) at 
../../../../sip/cpp/sip_corewxScrolledWindow.cpp:152
#12 0x00007ffff5feb922 in wxBookCtrlBase::AddPage(wxWindow*, wxString 
const&, bool, int) (this=0x5555565ca820, page=0x5555567fcec0, text=..., 
bSelect=false, imageId=-1)

So from my position of ignorance, I'm guessing that the Python code is 
trying to add a page to a notebook, and somewhere inside all that there is 
a Unicode error, and a bug is causing a Segfault rather than a smooth 
reporting of the Unicode error. But if I could get debugging symbols for 
wxPython I'd be able to take a closer look.

So I tried the usual approach to getting a debug build using setuptools,, 
and find that wxPython's setup.py script doesn't recognise the --debug 
switch. So could someone tell me how to make a debug build of wxPython.

FYI I'm running Linux/Debian unstable.

Help as always much appreciated.

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