Add comment explaining why cc does not rebuild on env PATH change (#1247

)
rust-lang · Oct 19, 2024 · e53eba3 · e53eba3
1 parent 9aab242
commit e53eba3
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/lib.rs b/src/lib.rs
@@ -3736,6 +3736,8 @@ impl Build {
         if let Some(val) = self.env_cache.read().unwrap().get(v).cloned() {
             return val;
         }
+        // Excluding `PATH` prevents spurious rebuilds on Windows, see
+        // <https://github.com/rust-lang/cc-rs/pull/1215> for details.
         if self.emit_rerun_if_env_changed && !provided_by_cargo(v) && v != "PATH" {
             self.cargo_output
                 .print_metadata(&format_args!("cargo:rerun-if-env-changed={}", v));