--- ../rustc-1.29.2-src/src/bootstrap/config.rs	2018-10-05 15:19:57.000000000 -0700
+++ ./src/bootstrap/config.rs	2018-10-19 14:18:14.000000000 -0700
@@ -416,7 +416,6 @@
 
         let build = toml.build.clone().unwrap_or(Build::default());
         // set by bootstrap.py
-        config.hosts.push(config.build.clone());
         for host in build.host.iter() {
             let host = INTERNER.intern_str(host);
             if !config.hosts.contains(&host) {