Function configure_compilation_cache 

pub fn configure_compilation_cache(command: &mut Command, sccache_path: &Path)

Route a Cargo invocation’s compiles through sccache.

Caching only bites because generated-crate builds also disable incremental compilation — Cargo does not pass -C incremental to registry dependencies but does pass it to every path dependency, which for a WaterUI build is the entire framework, and sccache refuses to cache an incremental compile. That setting lives in crate::build::configure_generated_crate_compilation rather than here, because it must not depend on whether a machine happens to have sccache installed: it changes the compiled ABI, and two builds in one flow have to agree on it.