Hello, I'm a user of boost::unordered_map and I always used this container with exceptions disabled (because I never use them and don't want them enabled if possible). I never had problems with that, but now with boost 1.50 and GCC 4.7.1 I get this error while compiling code using unordered_map: In file included from /usr/include/boost/unordered/unordered_map.hpp:17:0, from /usr/include/boost/unordered_map.hpp:16, from /home/hades/Bitral/include/CodeRegion.h:23, from /home/hades/Bitral/src/BitralContext.cpp:20: /usr/include/boost/unordered/detail/allocator_helpers.hpp: In instantiation of 'void boost::unordered::detail::construct_node(Alloc&, T*, const Args&) [with Alloc = std::allocator > >; T = boost::unordered::detail::ptr_node >; Args = boost::unordered::detail::emplace_args3, boost::tuples::tuple<> >]': /usr/include/boost/unordered/detail/buckets.hpp:75:13: required from 'void boost::unordered::detail::node_constructor<NodeAlloc>::construct_value(const Args&) [with Args = boost::unordered::detail::emplace_args3, boost::tuples::tuple<> >; NodeAlloc = std::allocator > >]' /usr/include/boost/unordered/detail/unique.hpp:386:13: required from 'boost::unordered::detail::table_impl<Types>::value_type& boost::unordered::detail::table_impl<Types>::operator[](const key_type&) [with Types = boost::unordered::detail::map >, Bitral::ConstantMemoryAddress, Bitral::CodeRegion*, boost::hashBitral::ConstantMemoryAddress, std::equal_toBitral::ConstantMemoryAddress >; boost::unordered::detail::table_impl<Types>::value_type = std::pair; boost::unordered::detail::table_impl<Types>::key_type = Bitral::ConstantMemoryAddress]' /usr/include/boost/unordered/unordered_map.hpp:1196:26: required from 'boost::unordered::unordered_map::mapped_type& boost::unordered::unordered_map::operator[](const key_type&) [with K = Bitral::ConstantMemoryAddress; T = Bitral::CodeRegion*; H = boost::hashBitral::ConstantMemoryAddress; P = std::equal_toBitral::ConstantMemoryAddress; A = std::allocator >; boost::unordered::unordered_map::mapped_type = Bitral::CodeRegion*; boost::unordered::unordered_map::key_type = Bitral::ConstantMemoryAddress]' /home/hades/Bitral/src/BitralContext.cpp:30:31: required from here /usr/include/boost/unordered/detail/allocator_helpers.hpp:643:11: error: exception handling disabled, use -fexceptions to enable The strange thing is that compiling the code with CLANG 3.1 and exceptions explicitly disabled works fine. There is a way to make it work with exceptions disabled and G++? Thanks Marcello