Hi, the following drives my mad: ---8<--- class CommandLineOptions { public: CommandLineOptions( int argc, char** argv ); bool option( const std::string& arg ) const; ... private: po::options_description generic_options; po::options_description hidden_options; po::options_description usage_options; po::options_description cmdline_options; po::positional_options_description pos_options; po::variables_map vm; }; --->8--- ---8<--- bool CommandLineOptions::option( const std::string& arg ) const { return vm.count( arg ); } --->8--- int main( int argc, char **argv ) { try { CommandLineOptions cmdline( argc, argv ); running using gdb (on return of main()): Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0xb6f826c0 (LWP 16599)] 0x08051cb2 in std::_Rb_tree<std::string, std::string, std::_Identity<std::string>, std::less<std::string>, std::allocator<std::string> >::_S_right (__x=0x11) at /usr/include/c++/4.2/bits/stl_tree.h:510 510 { return static_cast<_Link_type>(__x->_M_right); } (gdb) bt #0 0x08051cb2 in std::_Rb_tree<std::string, std::string, std::_Identity<std::string>, std::less<std::string>, std::allocator<std::string> >::_S_right (__x=0x11) at /usr/include/c++/4.2/bits/stl_tree.h:510 #1 0x0805291d in std::_Rb_tree<std::string, std::string, std::_Identity<std::string>, std::less<std::string>, std::allocator<std::string> >::_M_erase (this=0xbfb95e48, __x=0x11) at /usr/include/c++/4.2/bits/stl_tree.h:1323 #2 0x0805292c in std::_Rb_tree<std::string, std::string, std::_Identity<std::string>, std::less<std::string>, std::allocator<std::string> >::_M_erase (this=0xbfb95e48, __x=0x80c61b0) at /usr/include/c++/4.2/bits/stl_tree.h:1323 #3 0x0805297b in ~_Rb_tree (this=0xbfb95e48) at /usr/include/c++/4.2/bits/stl_tree.h:592 #4 0x080529cb in ~set (this=0xbfb95e48) at /usr/include/c++/4.2/bits/stl_set.h:94 #5 0x08052b83 in ~variables_map (this=0xbfb95e28) at /usr/local/include/boost/program_options/variables_map.hpp:139 #6 0x0805316d in ~CommandLineOptions (this=0xbfb95cac) at src/eda/workbench/CommandLineOptions.hpp:23 #7 0x080515c3 in main (argc=1, argv=0xbfb961c4) at src/eda/workbench/main.cpp:75 writing main() as: ---8<--- int main( int argc, char **argv ) { try { CommandLineOptions cmdline( argc, argv ); if (cmdline.option( "version" )) { std::cout << ... } running using gdb: Starting program: /home/opetzold/Projects/cpp/eda2/eda -v ... Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0xb6f716c0 (LWP 16883)] 0x08051d7e in std::_Rb_tree<std::string, std::pair<std::string const, boost::program_options::variable_value>, std::_Select1st<std::pair<std::string const, boost::program_options::variable_value> >, std::less<std::string>, std::allocator<std::pair<std::string const, boost::program_options::variable_value> > >::_S_right (__x=0xb0012) at /usr/include/c++/4.2/bits/stl_tree.h:510 510 { return static_cast<_Link_type>(__x->_M_right); } (gdb) bt #0 0x08051d7e in std::_Rb_tree<std::string, std::pair<std::string const, boost::program_options::variable_value>, std::_Select1st<std::pair<std::string const, boost::program_options::variable_value> >, std::less<std::string>, std::allocator<std::pair<std::string const, boost::program_options::variable_value> > >::_S_right (__x=0xb0012) at /usr/include/c++/4.2/bits/stl_tree.h:510 #1 0x08052b9f in std::_Rb_tree<std::string, std::pair<std::string const, boost::program_options::variable_value>, std::_Select1st<std::pair<std::string const, boost::program_options::variable_value> >, std::less<std::string>, std::allocator<std::pair<std::string const, boost::program_options::variable_value> > >::_M_erase ( this=0xbfe2c0a8, __x=0xb0012) at /usr/include/c++/4.2/bits/stl_tree.h:1323 #2 0x08052bae in std::_Rb_tree<std::string, std::pair<std::string const, boost::program_options::variable_value>, std::_Select1st<std::pair<std::string const, boost::program_options::variable_value> >, std::less<std::string>, std::allocator<std::pair<std::string const, boost::program_options::variable_value> > >::_M_erase ( this=0xbfe2c0a8, __x=0xb6fceb2c) at /usr/include/c++/4.2/bits/stl_tree.h:1323 #3 0x08052bfd in ~_Rb_tree (this=0xbfe2c0a8) at /usr/include/c++/4.2/bits/stl_tree.h:592 #4 0x08052c4d in ~map (this=0xbfe2c0a8) at /usr/include/c++/4.2/bits/stl_map.h:94 #5 0x08052cb6 in ~variables_map (this=0xbfe2c0a0) at /usr/local/include/boost/program_options/variables_map.hpp:139 #6 0x0805327f in ~CommandLineOptions (this=0xbfe2bf24) at src/eda/workbench/CommandLineOptions.hpp:23 #7 0x0805170a in main (argc=2, argv=0xbfe2c444) at src/eda/workbench/main.cpp:75 Each time it crash in ~variables_map. Is it a bug?? I'm using gcc-Version 4.2.3 20080114 (prerelease) (Debian 4.2.2-7) Thanks, Olaf