Rollup merge of #32786 - brson:cargotest, r=alexcrichton

Fix cargotest

Tested in dev.

src/bootstrap/build/check.rs

@@ -18,9 +18,18 @@ pub fn linkcheck(build: &Build, stage: u32, host: &str) {
 }
 
 pub fn cargotest(build: &Build, stage: u32, host: &str) {
+
     let ref compiler = Compiler::new(stage, host);
+
+    // Configure PATH to find the right rustc. NB. we have to use PATH
+    // and not RUSTC because the Cargo test suite has tests that will
+    // fail if rustc is not spelled `rustc`.
+    let path = build.sysroot(compiler).join("bin");
+    let old_path = ::std::env::var("PATH").expect("");
+    let sep = if cfg!(windows) { ";" } else {":" };
+    let ref newpath = format!("{}{}{}", path.display(), sep, old_path);
+
     build.run(build.tool_cmd(compiler, "cargotest")
-              .env("RUSTC", build.compiler_path(compiler))
-              .env("RUSTDOC", build.rustdoc(compiler))
+              .env("PATH", newpath)
               .arg(&build.cargo));
 }

src/bootstrap/build/step.rs

@@ -319,7 +319,7 @@ impl<'a> Step<'a> {
                 vec![self.librustc(self.compiler(stage))]
             }
             Source::ToolCargoTest { stage } => {
-                vec![self.libstd(self.compiler(stage))]
+                vec![self.libtest(self.compiler(stage))]
             }
 
             Source::DistDocs { stage } => vec![self.doc(stage)],

src/tools/cargotest/main.rs

@@ -19,7 +19,7 @@ use std::io::Write;
 
 const TEST_REPOS: &'static [(&'static str, &'static str, Option<&'static str>)] = &[
     ("https://github.com/rust-lang/cargo",
-     "ff02b156f094fb83e70acd965c83c9286411914e",
+     "fae9c539388f1b7c70c31fd0a21b5dd9cd071177",
      None),
     ("https://github.com/iron/iron",
      "16c858ec2901e2992fe5e529780f59fa8ed12903",