message: Mention sccache in the guide
diff: @@ -419,6 +419,21 @@ will not fail your overall build. Please see the [Travis CI Rust
  documentation](https://docs.travis-ci.com/user/languages/rust/) for more
  information.
  +
  +## Build cache
  +
  +Cargo shares build artifacts among all the packages of a single workspaces.
  +Today, Cargo does not share build results across different workspaces, but
  +a similar result can be achieved by using a third party tool, [sccache].
  +
  +To setup `sccache`, install it with `cargo install sccache` and set
  +`RUSTC_WRAPPER` environmental variable to `sccache` before invoking Cargo.
  +If you use bash, it makes sense to add `export RUSTC_WRAPPER=sccache` to
  +`.bashrc`. Refer to sccache documentation for more details.
  +
  +[sccache]: https://github.com/mozilla/sccache
  +
  +
  # Further reading
  Now that you have an overview of how to use cargo and have created your first
  