Question 1

How do I cross compile Rust for a Raspberry Pi?

Accepted Answer

Use the target triple `arm-unknown-linux-gnueabihf` for ARMv6 devices or `armv7-unknown-linux-gnueabihf` for ARMv7, install the gcc cross toolchain (e.g., `gcc-arm-linux-gnueabihf` on Ubuntu), and configure Cargo's linker in `.cargo/config` as shown in the guide's TL;DR example.

Question 2

Is rust-cross better than using the `cross` tool for Docker-based cross compilation?

Accepted Answer

rust-cross provides in-depth understanding and control over the cross-compilation process, ideal for custom setups or troubleshooting. In contrast, `cross` offers a more automated, containerized approach but may not cover advanced topics like `no_std` or building standard crates from source.

Question 3

How to fix 'undefined reference' errors when cross compiling Rust?

Accepted Answer

This often indicates a mismatch between C toolchain libc versions used for building standard crates and your program. Ensure the same cross toolchain is used for both, or if using official builds, check for compatibility issues as documented in the troubleshooting section.

Question 4

Can I use rust-cross for bare-metal embedded systems without an OS?

Accepted Answer

Yes, the guide covers `no_std` environments and target specification files, allowing you to cross compile for custom targets like Cortex-M microcontrollers. It references tools like `xargo` for managing sysroots and building freestanding crates.

Question 5

What's the difference between arm and armv7 target triples in Rust?

Accepted Answer

`arm` supports both ARMv6 and ARMv7 processors, while `armv7` is optimized for ARMv7 only, enabling additional features like NEON instructions. Use `armv7` for faster binaries on compatible devices, as explained in the target triple section.

Question 6

How to create a statically linked Rust binary with MUSL?

Accepted Answer

Target `x86_64-unknown-linux-musl` or `i686-unknown-linux-musl`, add the target with `rustup target add`, and build with `cargo build --target`. This produces binaries statically linked to the MUSL libc, avoiding dynamic dependencies, as detailed in the FAQ.

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