Add module for Applicaions in Rust support #78303
Description
Origin
This is code created by the Zephyr project (there isn't an issue type for this).
Purpose
This module adds support for developers to create applications written in Rust that run on top of Zephyr.
Mode of integration
Propose placing this under modules/lang/rust, the repo itself will be called zephyrproject-rtos/zephyr-lang-rust. This will be a new git repo, with development happening on this git repo.
Maintainership
The code is being developed by d3zd3z.
Pull Request
The code is at https://github.com/d3zd3z/zephyr-lang-rust, this can be placed under modules/lang/rust, and the Zephyr tree's west.yml given an entry for it, and the sample will then build.
Description
This is not third party code. After the 2024-09-11 TSC discussion, we discussed placing the current code from the collab-rust branch into a module. This is a proposal based on that suggestion.
Dependencies
The rust code will be build using the conventional tools used by the Rust ecosystem, which includes the cargo tool. Cargo manages downloading and compiling dependencies within the Rust code. This module contains a CMakeLists.txt file that adds a cmake helper function that an application can use to write an application in Rust. See the sample contained within the repo.
Revision
https://github.com/d3zd3z/zephyr-lang-rust main would be the initial version.
#78306 is a PR to bring this into the zephyr. This includes the Rust support (optionally), and demonstrates that the CI samples and tests from the module are run. Figuring out how to include documentation from the module is ongoing.
License
SPDX-License-Identifier: Apache-2.0
It could also be possible to use "Apache-2.0 or MIT" if we want better cohesion with the rust ecosystem, which typically uses that license, but I believe adding new code to Zephyr under different license terms would be a board decision.