Principle:Eventual Inc Daft Rust Workspace Build
| Knowledge Sources | |
|---|---|
| Domains | Build_System, Rust_Toolchain |
| Last Updated | 2026-02-08 14:00 GMT |
Overview
Architectural pattern that organizes a large Rust project as a Cargo workspace with shared dependency versions, feature flags, and build profiles to produce a single compiled output.
Description
A Cargo workspace groups multiple related Rust crates under a single `Cargo.toml` manifest. All member crates share a single `Cargo.lock` for reproducible builds, workspace-level dependency versions to avoid version drift, and common lint/profile configurations. Feature flags (like `python`) allow conditional compilation of sub-crate capabilities. This pattern is essential for Rust projects that produce a single binary or shared library from many modular sub-crates.
Usage
Apply this principle when designing a Rust project with 5+ interrelated crates that compile to a single output artifact. It is the standard approach for Rust-based data engines, compilers, and system-level Python extensions built with PyO3.
Theoretical Basis
The workspace pattern solves three problems:
- Version coherence: All crates resolve to the same versions of shared dependencies, eliminating diamond dependency conflicts.
- Build caching: Cargo reuses compiled artifacts across crates, so incremental builds only recompile changed crates.
- Feature composition: Feature flags propagate through the dependency graph, enabling conditional compilation (e.g., enabling Python bindings only when building the extension module).