[Boost-users] boost regex seg fault, can't run a single example....

From: paulo.fernando.silva_at_[hidden]
Date: 2006-07-04 08:26:30

Greetings
I've just emerged (I'm using gentoo) boost, once using bjam and another time
without it. In both cases (not that it could make a difference) I just can't
get the boost_regex to work. It blows...

After compiling a few examples (captures_example, and grep) in both my home and
work pc. I get the same result... segmentation fault.

While running captures_example in the line
std::cout << "      $" << i << " = \"" << what[i] << "\"\n";

After doing some debug, I was able to find only the consequence. (I didn't
search that hard...)

In sub_match.hpp:73
         result.append(1, *i);
the value of i is 0x1<address out of bounds>.
the line match_results.hpp:123 supposly returns

const boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> >
&) @0x804ded8: {<std::pair<__gnu_cxx::__normal_iterator<char const*,
std::string>, __gnu_cxx::__normal_iterator<char const*, std::string> >> = {
    first = {<std::iterator<std::random_access_iterator_tag, char, int, char
const*, char const&>> = {<No data fields>}, _M_current = 0x1 <Address 0x1 out
of bounds>},
    second = {<std::iterator<std::random_access_iterator_tag, char, int, char
const*, char const&>> = {<No data fields>}, _M_current = 0x804d067
"eeeeeeee"}}, matched = 111, m_captures = {ptr = 0x1}}

strangely enough, in the debuger, after returning from line
match_results.hpp:123 the execution jumps to match_results.hpp:125 and return
return m_null;

but the cpu registers don't change...
the truth is that I get this

Program received signal SIGSEGV, Segmentation fault.
0x0804a6d6 in boost::sub_match<__gnu_cxx::__normal_iterator<char const*,
std::string> >::str (
    this=0x804ded8) at sub_match.hpp:73
73               result.append(1, *i);

for no apparent reason.
Any ideas?
I'm using gcc 4.1 in my home pc and gcc 3.3.6 in my office pc.
PIII800MHz and PIV1.5GHz both with 512MB ram.

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