Note that you also may want to use xargo or cargo-xbuild to build other custom targets, and rustup to fetch the stdlib for the targets listed above.

Aren't there also linker issues with cross-building for some targets like i686-pc-windows-msvc? At least, I don't think I ever got it to work properly but I don't recall what the exact problem was.

Some platforms are harder than others, it’s true. And if you link to any C code, you have to deal with that as well. As an example, I just saw this: http://zork.net/~st/jottings/rust-windows-and-debian.html

We’ll get there!