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sccache includes support for caching Rust compilation. This includes many caveats, and is primarily focused on caching rustc invocations as produced by cargo. A (possibly-incomplete) list follows:

  • --emit is required.
  • --crate-name is required.
  • Only link, metadata and dep-info are supported as --emit values, and link must be present.
  • --out-dir is required.
  • -o file is not supported.
  • Compilation from stdin is not supported, a source file must be provided.
  • Values from env! require Rust >= 1.46 to be tracked in caching.
  • Procedural macros that read files from the filesystem may not be cached properly

If you are using Rust 1.18 or later, you can ask cargo to wrap all compilation with sccache by setting RUSTC_WRAPPER=sccache in your build environment.