sccache

sccache caches compiled artifacts across builds, significantly reducing incremental and clean build times.

Installation

cargo install sccache

Or via Homebrew on macOS:

brew install sccache

Configuration

Set the Rust compiler wrapper in ~/.cargo/config.toml:

[build]
rustc-wrapper = "sccache"

Alternatively, export the environment variable:

export RUSTC_WRAPPER=sccache

Verify

After building the project, check cache statistics:

sccache --show-stats

CI Usage

In GitHub Actions, add sccache before cargo build:

- name: Install sccache
  uses: mozilla-actions/sccache-action@v0.0.9

- name: Build
  run: cargo build --workspace
  env:
    RUSTC_WRAPPER: sccache
    SCCACHE_GHA_ENABLED: "true"

Storage Backends

By default sccache uses a local disk cache at ~/.cache/sccache. For shared caches across CI runners, configure a remote backend:

See the sccache documentation for full configuration options.