in boost 1.46.1 program_options lib is unusable in macports

[christophe.prudhomme@…]

the following simple program using boost.program_options crashes with the boost macports

#include <iostream>

#include <boost/program_options.hpp>
namespace po = boost::program_options;
int main(int ac, char** av)
{
	using namespace std;
//locale::global(locale(""));
// Declare the supported options.
po::options_description desc("Allowed options");
desc.add_options()
    ("help", "produce help message")
    ("compression", po::value<int>(), "set compression level")
;

po::variables_map vm;
po::store(po::parse_command_line(ac, av, desc), vm);
po::notify(vm);

if (vm.count("help")) {
	cout << desc << "\n";
    return 1;
}

if (vm.count("compression")) {
    cout << "Compression level was set to "
 << vm["compression"].as<int>() << ".\n";
} else {
    cout << "Compression level was not set.\n";
}
}

the problem lies in printing the options_description structure

(gdb) r --help
Starting program: /private/tmp/t --help
Allowed options:
t(40384) malloc: *** error for object 0x7fff70a22500: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug

Program received signal SIGABRT, Aborted.
0x00007fff88cab5d6 in __kill ()
(gdb) bt
#0  0x00007fff88cab5d6 in __kill ()
#1  0x00007fff88d4bcd6 in abort ()
#2  0x00007fff88c636b5 in free ()
#3  0x00000001001299d0 in std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::overflow ()
#4  0x000000010012e13c in std::basic_streambuf<char, std::char_traits<char> >::xsputn ()
#5  0x00007fff84fcdae4 in std::__ostream_write<char, std::char_traits<char> > ()
#6  0x00007fff84fcbb98 in std::__ostream_insert<char, std::char_traits<char> > ()
#7  0x0000000100063b3d in boost::program_options::options_description::print ()
#8  0x00000001000640b7 in boost::program_options::operator<< ()
#9  0x00000001000016cf in main ()

[christophe.prudhomme@…]

test program to reproduce the crash

[christophe.prudhomme@…]

Note that the example is taken from the boost.program_options from the tutorial I suspect this has to do with utf-8 encoding and locales.