This crate looks at your build target (using the $TARGET environment variable that cargo sets) and provides a selection of --cfg values to rustc that might be useful.

Add to your build dependencies and make a build.rs file like this:

fn main() {
    arm_targets::process();
}

Cargo will be given configuration like this:

cargo:rustc-cfg=arm_architecture="v7-r"
cargo:rustc-check-cfg=cfg(arm_architecture, values("v6-m", "v7-m", "v7e-m", "v8-m.base", "v8-m.main", "v7-r", "v8-r", "v7-a", "v8-a"))
cargo:rustc-cfg=arm_isa="A32"
cargo:rustc-check-cfg=cfg(arm_isa, values("A64", "A32", "T32"))

This allows you to write Rust code in your firmware like:

#[cfg(any(arm_architecture = "v7-r", arm_architecture = "v8-r"))]

This crate is guaranteed to compile on stable Rust 1.59.0 and up, as recorded by the package.rust-version property in Cargo.toml.

Increasing the MSRV is not considered a breaking change and may occur in a minor version release (e.g. from 0.3.0 to 0.3.1, because this is still a 0.x release).

• Copyright (c) Ferrous Systems
• Copyright (c) The Rust Embedded Devices Working Group developers

Licensed under either MIT or Apache-2.0 at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you shall be licensed as above, without any additional terms or conditions.