Rust integration as a Zephyr application

How to build

# at a directory you can build Zephyr application
# setup Zephyr build environment variables, e.g., using `zephyr-env.sh`
git clone https://github.com/tomoyuki-nakabayashi/zephyr-rust-integration.git
cd zephyr-rust-integration/hello_rust
mkdir build && cd build
cmake -GNinja -DBOARD=qemu_cortex_m3 ..
ninja run

Then, you can finally see:

***** Booting Zephyr OS zephyr-v1.13.0-3321-g7f956a9 *****
Hello World! qemu_cortex_m3
Hello from Rust.

prerequisite

Zephyr side

First of all, you must setup Zephyr development environment to build application targeting qemu_cortex_m3. Zephyr Getting Started Guide will help you to setup the development environment.

I tested this sample using zephyr-sdk-0.9.5. I recommend you use the same version of zephyr-sdk.

Rust side

Rust 1.32.0 stable channel.
cargo-binutils

$ rustup component add llvm-tools-preview

$ cargo install cargo-binutils --vers 0.1.4

$ cargo size -- -version
LLVM (http://llvm.org/):
  LLVM version 8.0.0svn
  Optimized build.
  Default target: x86_64-unknown-linux-gnu
  Host CPU: skylake

cbindgen

cargo install cbindgen

Limitations