sccache now includes experimental 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
anddep-info
are supported as--emit
values, andlink
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!
will not be tracked in caching. - Procedural macros that read files from the filesystem may not be cached properly
- Target specs aren't hashed (e.g. custom target specs)
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.