I don't know if this is still true, but at one point in time you needed to have installed the exact same version of MinGW that Rust itself was compiled with. Th

I don't know if this is still true, but at one point in time you needed to have installed the exact same version of MinGW that Rust itself was compiled with. That meant, for example, that you couldn't rebuild Rust with a newer version of MinGW. Also, and this isn't really a Rust problem so much as an LLVM one, I believe exception handling was broken on Windows for some time. Presumably this is fixed now, but I haven't actually checked recently.