mtime+content tracking

Author: gilescope

Cargo.toml

@@ -33,6 +33,7 @@ anyhow = "1.0"
 filetime = "0.2.9"
 flate2 = { version = "1.0.3", default-features = false, features = ["zlib"] }
 git2 = "0.13.12"
+fxhash = "0.2.1"
 git2-curl = "0.14.0"
 glob = "0.3.0"
 hex = "0.4"

src/cargo/core/compiler/context/mod.rs

@@ -38,7 +38,7 @@ pub struct Context<'a, 'cfg> {
     /// Fingerprints used to detect if a unit is out-of-date.
     pub fingerprints: HashMap<Unit, Arc<Fingerprint>>,
     /// Cache of file mtimes to reduce filesystem hits.
-    pub mtime_cache: HashMap<PathBuf, FileTime>,
+    pub mtime_cache: HashMap<PathBuf, (FileTime, u32, u64)>,
     /// A set used to track which units have been compiled.
     /// A unit may appear in the job graph multiple times as a dependency of
     /// multiple packages, but it only needs to run once.