Compiling Rust with GCC: an update

Rust's tier support list says armv4t-none-eabi has tier 3. That platform is described as ARMv4 with Thumb and exists particularly to make the Nintendo Gameboy Advance work.

Tier 3 means Rust's CI checks this compiles, but they don't check it works, and it is only supplied with the core library.

Obviously the kernel is comfortable in that world, you can't just TcpStream::connect() from inside the kernel either, although it won't fit on a GBA as I understand it, presumably if you've got a big enough ARMv4 system to run Linux, Rust isn't a difficult problem.