Ah right, this. So it seems like it's expecting to find a function named `_Unwind_Resume` but `i686-w64-mingw32-nm /usr/lib/gcc/i686-w64-mingw32/4.6/libgcc_s.a` informs me there is no such symbol but there is `_Unwind_SjLj_Resume` which I'm assuming is the one you want for the sjlj-style variant.