From 4e758722f4f9ccf9054ebf179b8630a37ce954f1 Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Tue, 5 Apr 2016 10:00:51 -0700
Subject: [PATCH] rustbuild: Verify flags are configured

Building with `--target foo` should fail because that target wasn't actually
validated.
---
 src/bootstrap/build/sanity.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/bootstrap/build/sanity.rs b/src/bootstrap/build/sanity.rs
index be4416c697c..6ce27496388 100644
--- a/src/bootstrap/build/sanity.rs
+++ b/src/bootstrap/build/sanity.rs
@@ -119,4 +119,16 @@ $ pacman -R cmake && pacman -S mingw-w64-x86_64-cmake
             }
         }
     }
+
+    for host in build.flags.host.iter() {
+        if !build.config.host.contains(host) {
+            panic!("specified host `{}` is not in the ./configure list", host);
+        }
+    }
+    for target in build.flags.target.iter() {
+        if !build.config.target.contains(target) {
+            panic!("specified target `{}` is not in the ./configure list",
+                   target);
+        }
+    }
 }