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COMPILING.md: Add section about cross compiling for Raspberry Pi #1405

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COMPILING.md: Add section about cross compiling for Raspberry Pi #1405

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23 changes: 23 additions & 0 deletions COMPILING.md
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Expand Up @@ -110,6 +110,29 @@ For example, to build with the ALSA audio and libmdns discovery backend:
cargo build --no-default-features --features "alsa-backend with-libmdns"
```

#### Cross Compiling for Raspberry Pi

To cross compile for Raspberry pi, get the arm-unknown-gnueabihf target for Rust:

```bash
rustup target add armv7-unknown-linux-gnueabi
```

You need to manually add a linker, which can be installed with apt:

```bash
sudo apt install gcc-arm-linux-gnueabihf
```

The target must be specified to cargo along with the linker.
This can be done via `.cargo/config.toml`, or via command line:

```bash
RUSTFLAGS="-C linker=arm-linux-gnueabihf-gcc" cargo build --no-default-features --target armv7-unknown-linux-gnueabihf
```

Note that this does not work with armv6 (found e.g. in Raspberry Pi 1 and Zero). Previously, you could use the linker in https://github.com/raspberrypi/tools, but this is now too old and will give an error when compiling Librespot (since `3e85d77bfb3520e16c35bb7db3912c76e8cc90d7`). More info: https://github.com/japaric/rust-cross/issues/42
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I compile librespot for armv6 using the official raspi tools no problem. But I don't use cargo cross. I suggest just stating your method doesn't work for pi 1 and zero.

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I'm also not using cargo cross. After commit 3e85d77 I get an error from the rpi tools linker saying it found dwarf version 6, but only supports versions 1-4. Maybe I'm using a newer version of Rust (I'm on 1.82.0)?

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I'll update and see what I get. Does this happen even when compiling with the release profile?


### Running

Assuming you just compiled a ```debug``` build, you can run librespot with the following command:
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