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Expand the guide for cross-compilation on Ubuntu/Debian #21

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14 changes: 14 additions & 0 deletions README.md
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Expand Up @@ -31,11 +31,25 @@ get too messy either.
- Install Rust from https://rustup.rs/
- Run `rustup target add arm-unknown-linux-gnueabihf`
- Install `sudo apt install libclang-dev`
- Build with `cargo build`

## Cross-compiling on Ubuntu/Debian
- Install Rust from https://rustup.rs/
- Run `rustup target add arm-unknown-linux-gnueabihf`
- Install `sudo apt install libclang-dev gcc-arm-linux-gnueabihf`
- Create the directory `.cargo` in the root of your Rust project and create a local cargo configuration file `config.toml` in it.
- Paste the following lines into `config.toml` to always build for the `arm-unknown-linux-gnueabihf` target, to use the GCC linker for this architecture and to set the sysroot so that the linker can find the necessary header files:
```
[build]
target = "arm-unknown-linux-gnueabihf"

[target.arm-unknown-linux-gnueabihf]
linker = "arm-linux-gnueabihf-gcc"

[env]
RPI_WS281X_SYSROOT = "/usr/arm-linux-gnueabihf"
```
- Build with `cargo build`

### AArch64 Builds
- Run `rustup target add aarch64-unknown-linux-gnu`
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