如何编译Rust代码以在Raspberry Pi 2上运行？

Question

I recently acquired a Raspberry PI 2 and I want to run a Rust program on it.

Is there a guide/instructions how to cross compile Rust programs on Raspberry PI 2? I've heard about running Rust on RPi or Arduino, although not recently.

I want a Hello World equivalent Rust program running on Raspberry Pi 2. It doesn't have to be a literal Hello World program, just something that is of similar low complexity.

Answer 1

We have rustup now.

$ rustup target add arm-unknown-linux-gnueabihf
$ sudo apt-get install gcc-arm-linux-gnueabihf
$ echo '[target.arm-unknown-linux-gnueabihf]' >> ~/.cargo/config
$ echo 'linker = "arm-linux-gnueabihf-gcc"' >> ~/.cargo/config
$ cd <project dir>
$ cargo build --target=arm-unknown-linux-gnueabihf

Answer 2

The Rust compiler is not distributed as a cross-compiler for the Raspberry Pi, so it needs to be compiled as a cross compiler with rpi dev tools.

1. Get rpi dev tools - git clone https://github.com/raspberrypi/tools.git ~/pi-tools

2. get rust compiler from mozilla git repo and add rpi tools to the path export PATH=~/pi-tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin:$PATH

3. Look for rusty-pi dir on your home ./configure --target=arm-unknown-linux-gnueabihf --prefix=$HOME/rusty-pi && make && make install

4. Considering helloworld.rs -> % ~/pi-rust/bin/rustc --target=arm-unknown-linux-gnueabihf -C linker=arm-linux-gnueabihf-g++ helloworld.rs

It will produce an executable.

Answer 3

@kazhik's answer will work for Raspberry Pi 2s and 3s (which are ARMv7/8 based ), but not for Raspberry Pi 1s or Zeros (which are ARMv6 based ).

The problem is that Debian/Ubuntu's armhf port (and thus their gcc-arm-linux-gnueabihf package/compiler/toolchain) targets >= ARMv7 .

Fortunately, rustup's gcc-arm-linux-gnueabihf targets >= ARMv6 (with hardware floating-point, which all Raspberry Pis support), so all that's needed is the correct linker. The Raspberry Pi foundation provides one of those in their tools repository .

Putting it together, the following steps can be used to cross compile a Rust binary that works on all Raspberry Pis:

$ rustup target add arm-unknown-linux-gnueabihf
$ git clone --depth=1 https://github.com/raspberrypi/tools raspberrypi-tools
$ echo "[target.arm-unknown-linux-gnueabihf]" >> ~/.cargo/config
$ echo "linker = \"$(pwd)/raspberrypi-tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-gcc\"" >> ~/.cargo/config

To test the cross-compiler (assuming a Pi is running and reachable with the default raspberrypi hostname):

cpick@devhost:  $ cargo new --bin rpi-test
cpick@devhost:  $ cd rpi-test
cpick@devhost:  $ cargo build --target=arm-unknown-linux-gnueabihf
cpick@devhost:  $ scp target/arm-unknown-linux-gnueabihf/debug/rpi-test pi@raspberrypi:
cpick@devhost:  $ ssh pi@raspberrypi
pi@raspberrypi: $ ./rpi-test
Hello, world!