Fix compiling other codegen backends when llvm is enabled

Author: bjorn3

src/bootstrap/builder.rs

@@ -1288,7 +1288,7 @@ impl<'a> Builder<'a> {
         // requirement, but the `-L` library path is not propagated across
         // separate Cargo projects. We can add LLVM's library path to the
         // platform-specific environment variable as a workaround.
-        if mode == Mode::ToolRustc {
+        if mode == Mode::ToolRustc || mode == Mode::Codegen {
             if let Some(llvm_config) = self.llvm_config(target) {
                 let llvm_libdir = output(Command::new(&llvm_config).arg("--libdir"));
                 add_link_lib_path(vec![llvm_libdir.trim().into()], &mut cargo);

src/bootstrap/compile.rs

@@ -806,6 +806,10 @@ impl Step for CodegenBackend {
 
         let tmp_stamp = out_dir.join(".tmp.stamp");
 
+        builder.info(&format!(
+            "Building stage{} codegen backend {} ({} -> {})",
+            compiler.stage, backend, &compiler.host, target
+        ));
         let files = run_cargo(builder, cargo, vec![], &tmp_stamp, vec![], false);
         if builder.config.dry_run {
             return;