Cross build #15
Cross build #15
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Reviewer's GuideThis PR enables no_std mode for the demos crate when not testing and introduces a GitHub Actions workflow to cross-compile the project for embedded thumb targets. Class diagram for demos crate no_std configurationclassDiagram
class demos {
<<crate>>
+no_std (enabled when not(test))
}
File-Level Changes
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Summary of Changes
Hello @kaidokert, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request introduces foundational changes to support cross-compilation for the demos crate. By conditionally opting out of the standard library for non-test builds, it paves the way for targeting diverse environments, significantly broadening the project's potential deployment scenarios.
Highlights
- Cross-compilation support: Enabled
no_stdfor thedemoscrate by adding#![cfg_attr(not(test), no_std)]todemos/src/lib.rs. This allows the crate to be built for environments without the standard library, such as embedded systems, while still permitting tests to utilize the standard library.
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Hey @kaidokert - I've reviewed your changes - here's some feedback:
- The cross-compile workflow only installs the Rust target but not the platform linker (e.g., gcc-arm-none-eabi), so you should add steps to install/link the required toolchain for linking no_std binaries.
- Adding #![cfg_attr(not(test), no_std)] to the demos crate may break existing examples—ensure all std usage is gated or removed so the crate truly builds under no_std.
- Consider adding a cache step (actions/cache) for Cargo registry and build artifacts to speed up repeat workflow runs.
Prompt for AI Agents
Please address the comments from this code review:
## Overall Comments
- The cross-compile workflow only installs the Rust target but not the platform linker (e.g., gcc-arm-none-eabi), so you should add steps to install/link the required toolchain for linking no_std binaries.
- Adding #![cfg_attr(not(test), no_std)] to the demos crate may break existing examples—ensure all std usage is gated or removed so the crate truly builds under no_std.
- Consider adding a cache step (actions/cache) for Cargo registry and build artifacts to speed up repeat workflow runs.Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.
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Code Review
This pull request adds conditional no_std support to the demos crate. This is a positive change that aligns the demo crate with the main picojson library's focus on resource-constrained environments and enables cross-building for no_std targets. The implementation uses the standard cfg_attr attribute, which is the correct and idiomatic way to achieve this in Rust. The change is sound and I have no suggestions for improvement.
Summary by Sourcery
Enable no_std in the demos crate for non-test builds and introduce a CI workflow to cross-compile embedded targets.
Enhancements:
CI: