From 9ccb85d7dbeca051c7dc2a406fd9be5368f87d20 Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Wed, 25 Sep 2019 08:18:05 -0700
Subject: [PATCH] Don't ever capture CPU state if timings are disabled

This should initially help with the panic in #7427 but doesn't solve it.
---
 src/cargo/core/compiler/timings.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/cargo/core/compiler/timings.rs b/src/cargo/core/compiler/timings.rs
index a3ed1800bf8..a03b89e832b 100644
--- a/src/cargo/core/compiler/timings.rs
+++ b/src/cargo/core/compiler/timings.rs
@@ -142,7 +142,7 @@ impl<'a, 'cfg> Timings<'a, 'cfg> {
             unit_times: Vec::new(),
             active: HashMap::new(),
             concurrency: Vec::new(),
-            last_cpu_state: State::current().ok(),
+            last_cpu_state: if enabled { State::current().ok() } else { None },
             last_cpu_recording: Instant::now(),
             cpu_usage: Vec::new(),
         }