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rust-build-times

Use when profiling slow Rust builds with cargo --timings, configuring sccache, selecting the Cranelift dev backend, splitting a workspace for parallelism, or tuning LTO and the linker.

.devin/skills/rust-build-times/SKILL.md

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# Rust build times

Compile time is a measurement problem first. Profile before changing anything, apply one change at a time, and keep only measured wins.

## Contract

| Field | Bound contract |
|---|---|
| Trigger | A Rust build is slow and the user wants it measured and reduced: `cargo build --timings`, sccache, the Cranelift backend, workspace splitting, LTO tuning, or a faster linker. |
| Authority | Reversible local. Writes only the project's Cargo.toml and .cargo/config.toml; rollback is version control. Toolchain component and system package installs are reported as commands for the user, not executed. No remote mutation. |
| Side effect | Edits project build configuration and emits a measurement report. |
| Done | A baseline `cargo build --timings` report exists, each applied change is measured against it, and only measured wins remain in the configuration. |

## Inputs