http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51673
--- Comment #6 from Pawel Sikora <pluto at agmk dot net> 2011-12-28 16:06:47 UTC --- btw, i've tested the default allocator with std::__7 and the i686-pc-mingw32 toolchain works fine while the x86_64-pc-mingw32 reports undefined reference to .text$_ZN9__gnu_cxx3__713new_allocatorIiE8allocateEyPKv[__gnu_cxx::__7::new_allocator<int>::allocate(unsigned long long, void const*)] so, there's a bug with symbol exporting not directly related to mt_allocator. _Znwj vs. _Znwy issue?