Merrill Cornish wrote:
I've still got the problem that an illegal option value triggers Dr Watson. I need to create a short example that I can post.
Here's one to produce my segfault, which may or may not be the same as yours: #include <boost/program_options.hpp> #include <iostream> int main(int argc, char* argv[]) { try { boost::program_options::options_description desc("Test"); desc.add_options()("test", boost::program_options::value<std::string>(), "import the specified OBJ file and save it to MDLM format"); std::cerr << desc; return 0; } catch (const std::exception& except) { std::cerr << except.what() << std::endl; return 1; } } As per my message the other day, this triggers a bug in options_description.cpp's format_paragraph function, which causes a segfault on linux with g++ 4.0.2 (and an assertion failure on Visual Studio 2005 beta 2); running it under valgrind 2.4.0 on linux produces: ==5197== Memcheck, a memory error detector for x86-linux. ==5197== Copyright (C) 2002-2005, and GNU GPL'd, by Julian Seward et al. ==5197== Using valgrind-2.4.0, a program supervision framework for x86-linux. ==5197== Copyright (C) 2000-2005, and GNU GPL'd, by Julian Seward et al. ==5197== For more details, rerun with: -v ==5197== Test: --test arg import the specified OBJ file and save it to MDLM format ==5197== Invalid read of size 2 ==5197== at 0x1B9ABB6E: __gnu_cxx::__pool<true>::_M_reclaim_block(char*, unsigned) (in /usr/lib/libstdc++.so.6.0.6) ==5197== by 0x804A35C: __gnu_cxx::__mt_alloc<unsigned long, __gnu_cxx::__common_pool_policy<__gnu_cxx::__pool, true>
::deallocate(unsigned long*, unsigned) (in /home/will/devel/a.out) ==5197== by 0x804A39B: std::_Bvector_base<std::allocator<bool> ::_M_deallocate() (in /home/will/devel/a.out) ==5197== by 0x804A3B3: std::_Bvector_base<std::allocator<bool> ::~_Bvector_base() (in /home/will/devel/a.out) ==5197== by 0x804A40B: std::vector<bool, std::allocator<bool> ::~vector() (in /home/will/devel/a.out) ==5197== by 0x804A79A: boost::program_options::options_description::~options_description() (in /home/will/devel/a.out) ==5197== by 0x8049863: main (in /home/will/devel/a.out) ==5197== Address 0x8 is not stack'd, malloc'd or (recently) free'd ==5197== ==5197== Process terminating with default action of signal 11 (SIGSEGV) ==5197== Access not within mapped region at address 0x8 ==5197== at 0x1B9ABB6E: __gnu_cxx::__pool<true>::_M_reclaim_block(char*, unsigned) (in /usr/lib/libstdc++.so.6.0.6) ==5197== by 0x804A35C: __gnu_cxx::__mt_alloc<unsigned long, __gnu_cxx::__common_pool_policy<__gnu_cxx::__pool, true> ::deallocate(unsigned long*, unsigned) (in /home/will/devel/a.out) ==5197== by 0x804A39B: std::_Bvector_base<std::allocator<bool> ::_M_deallocate() (in /home/will/devel/a.out) ==5197== by 0x804A3B3: std::_Bvector_base<std::allocator<bool> ::~_Bvector_base() (in /home/will/devel/a.out) ==5197== by 0x804A40B: std::vector<bool, std::allocator<bool> ::~vector() (in /home/will/devel/a.out) ==5197== by 0x804A79A: boost::program_options::options_description::~options_description() (in /home/will/devel/a.out) ==5197== by 0x8049863: main (in /home/will/devel/a.out) ==5197== ==5197== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 25 from 1) ==5197== malloc/free: in use at exit: 857654 bytes in 79 blocks. ==5197== malloc/free: 81 allocs, 2 frees, 858704 bytes allocated. ==5197== For counts of detected errors, rerun with: -v ==5197== searching for pointers to 79 not-freed blocks. ==5197== checked 1037872 bytes. ==5197== ==5197== LEAK SUMMARY: ==5197== definitely lost: 0 bytes in 0 blocks. ==5197== possibly lost: 8160 bytes in 2 blocks. ==5197== still reachable: 849494 bytes in 77 blocks. ==5197== suppressed: 0 bytes in 0 blocks. ==5197== Reachable blocks (those to which a pointer was found) are not shown. ==5197== To see them, rerun with: --show-reachable=yes Segmentation fault
-- Will Bryant http://carcino.gen.nz/ will@core-dev.co.nz +64 21 655 443