Build all stages with relative libdirs.

Author: o01eg

src/bootstrap/compile.rs

@@ -500,7 +500,7 @@ impl Step for Rustc {
 
 /// Same as `std_cargo`, but for libtest
 pub fn rustc_cargo(build: &Build,
-                   compiler: &Compiler,
+                   _compiler: &Compiler,
                    target: Interned<String>,
                    cargo: &mut Command) {
     cargo.arg("--features").arg(build.rustc_features())
@@ -514,13 +514,9 @@ pub fn rustc_cargo(build: &Build,
          .env("CFG_VERSION", build.rust_version())
          .env("CFG_PREFIX", build.config.prefix.clone().unwrap_or_default());
 
-    if compiler.stage == 0 {
-        cargo.env("CFG_LIBDIR_RELATIVE", "lib");
-    } else {
-        let libdir_relative =
-            build.config.libdir_relative.clone().unwrap_or(PathBuf::from("lib"));
-        cargo.env("CFG_LIBDIR_RELATIVE", libdir_relative);
-    }
+    let libdir_relative =
+        build.config.libdir_relative.clone().unwrap_or(PathBuf::from("lib"));
+    cargo.env("CFG_LIBDIR_RELATIVE", libdir_relative);
 
     // If we're not building a compiler with debugging information then remove
     // these two env vars which would be set otherwise.