From 28670b68c9b8f4d4e364188b599ec72bed5a593f Mon Sep 17 00:00:00 2001
From: Marco Castelluccio <mcastelluccio@mozilla.com>
Date: Wed, 20 Jun 2018 00:32:33 +0100
Subject: [PATCH] Raise an error if gcov profiling and incremental compilation
 are both enabled

---
 src/librustc/session/config.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/librustc/session/config.rs b/src/librustc/session/config.rs
index f831b006642bb..f97e11ef72f49 100644
--- a/src/librustc/session/config.rs
+++ b/src/librustc/session/config.rs
@@ -1970,6 +1970,13 @@ pub fn build_session_options_and_crate_config(
         );
     }
 
+    if debugging_opts.profile && incremental.is_some() {
+        early_error(
+            error_format,
+            "can't instrument with gcov profiling when compiling incrementally",
+        );
+    }
+
     let mut prints = Vec::<PrintRequest>::new();
     if cg.target_cpu.as_ref().map_or(false, |s| s == "help") {
         prints.push(PrintRequest::TargetCPUs);