From 0af2914bd923dbd3478df13954a274a0414ab1a8 Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Fri, 2 Jun 2017 09:15:11 -0700
Subject: [PATCH] Don't spawn threads for fresh work

On "fresh" builds this ends up just wasting a lot of time!
---
 src/cargo/ops/cargo_rustc/job_queue.rs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/cargo/ops/cargo_rustc/job_queue.rs b/src/cargo/ops/cargo_rustc/job_queue.rs
index 7bb3e35e1..fa008289d 100644
--- a/src/cargo/ops/cargo_rustc/job_queue.rs
+++ b/src/cargo/ops/cargo_rustc/job_queue.rs
@@ -294,12 +294,16 @@ impl<'a> JobQueue<'a> {
         *self.counts.get_mut(key.pkg).unwrap() -= 1;
 
         let my_tx = self.tx.clone();
-        scope.spawn(move || {
+        let doit = move || {
             let res = job.run(fresh, &JobState {
                 tx: my_tx.clone(),
             });
             my_tx.send(Message::Finish(key, res)).unwrap();
-        });
+        };
+        match fresh {
+            Freshness::Fresh => doit(),
+            Freshness::Dirty => { scope.spawn(doit); }
+        }
 
         // Print out some nice progress information
         self.note_working_on(config, &key, fresh)?;
-- 
2.30.2