[Boost-users] [python], [regex] Segmentation fault when deallocating match_results in a python extension module

From: bernhard.maeder_at_[hidden]
Date: 2006-07-19 03:13:17

Hello everybody

I have a problem in a boost.python module that makes use of the 
boost.regex library. I'm not sure how much the problem is related to those 
two libraries or whether I'm just doing something wrong in the build 
setup.

I have the following two python modules:

*** test2.cpp ***
#include <string>

#include<boost/python.hpp>
#include<boost/regex.hpp>

using namespace boost;
using namespace boost::python;

void test_func(std::string const & in)
{
    boost::regex expr("^(.*)\\[.*\\]$");
    boost::match_results<std::string::const_iterator> match;
    boost::regex_match(in.begin(), in.end(), match, expr);
}

BOOST_PYTHON_MODULE(test2)
{
     def("testFunc", &test_func);
}

*** Build command ***
g++-3.4 -Wall -pthread -fPIC -I. -I/usr/include/python2.3 -c -otest2.os 
test2.cpp 
g++-3.4 -pthread -shared -o test2.so test2.os -lpython2.3 
-lboost_python-gcc-mt-1_33 -lboost_regex-gcc-mt-1_33 

*** test.py ***

from test2 import *
testFunc('justastring')

*** output ***

>>> from test2 import *
>>> testFunc('justastring')
Segmentation fault

The program aborts when exiting test_func(), during deallocation of 
match_results. The error occurs somewhere in _M_deallocate of 
stl_vector.h.

Can anybody help me with this problem? What could possibly go wrong here? 

One thing I noted: python is compiled using GCC3.3 on our system, while we 
are using GCC3.4, is this a problem? (But, trying the same on a system 
with GCC 4 for both, python and our app, also fails, so it seems like the 
problem is to be sought elsewhere).

Thanks a lot!
Bernhard