From 2bf05f208272cd58c57f4d7d8d0e10fdb22e8719 Mon Sep 17 00:00:00 2001
From: Josh Stone <jistone@redhat.com>
Date: Fri, 27 Sep 2019 12:33:08 -0700
Subject: [PATCH] [WIP] minimize the rust-std component

---
 src/bootstrap/dist.rs | 45 +++++++++++++++----------------------------
 1 file changed, 16 insertions(+), 29 deletions(-)

diff --git a/src/bootstrap/dist.rs b/src/bootstrap/dist.rs
index 552965863d10..76fbd07f9fb5 100644
--- a/src/bootstrap/dist.rs
+++ b/src/bootstrap/dist.rs
@@ -667,41 +667,28 @@ impl Step for Std {
             return distdir(builder).join(format!("{}-{}.tar.gz", name, target));
         }
 
-        // We want to package up as many target libraries as possible
-        // for the `rust-std` package, so if this is a host target we
-        // depend on librustc and otherwise we just depend on libtest.
-        if builder.hosts.iter().any(|t| t == target) {
-            builder.ensure(compile::Rustc { compiler, target });
-        } else {
-            if builder.no_std(target) == Some(true) {
-                // the `test` doesn't compile for no-std targets
-                builder.ensure(compile::Std { compiler, target });
-            } else {
-                builder.ensure(compile::Test { compiler, target });
-            }
-        }
+        builder.ensure(compile::Std { compiler, target });
+        builder.ensure(compile::Test { compiler, target });
 
         let image = tmpdir(builder).join(format!("{}-{}-image", name, target));
         let _ = fs::remove_dir_all(&image);
 
-        let dst = image.join("lib/rustlib").join(target);
+        let dst = image.join("lib/rustlib").join(target).join("lib");
         t!(fs::create_dir_all(&dst));
-        let mut src = builder.sysroot_libdir(compiler, target).to_path_buf();
-        src.pop(); // Remove the trailing /lib folder from the sysroot_libdir
-        builder.cp_filtered(&src, &dst, &|path| {
-            if let Some(name) = path.file_name().and_then(|s| s.to_str()) {
-                if name == builder.config.rust_codegen_backends_dir.as_str() {
-                    return false
-                }
-                if name == "bin" {
-                    return false
-                }
-                if name.contains("LLVM") {
-                    return false
-                }
+
+        let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
+        let stamp = dbg!(compile::libstd_stamp(builder, compiler_to_use, target));
+        for (path, host) in builder.read_stamp_file(&stamp) {
+            if !host {
+                builder.copy(&path, &dst.join(path.file_name().unwrap()));
             }
-            true
-        });
+        }
+        let stamp = dbg!(compile::libtest_stamp(builder, compiler_to_use, target));
+        for (path, host) in builder.read_stamp_file(&stamp) {
+            if !host {
+                builder.copy(&path, &dst.join(path.file_name().unwrap()));
+            }
+        }
 
         let mut cmd = rust_installer(builder);
         cmd.arg("generate")
-- 
2.21.0