Rollup merge of #110365 - ozkanonur:ship-tools-with-sysroot, r=jyn514

ship tools with sysroot

Provides tool binaries under the sysroot which can be used/tested with `cargo +custom-toolchain $tool`

Clippy and fmt works without any problem.

But can't say the same for miri:

```sh
  ~/devspace/.other/chunk-list  stable $ cargo +stage2 miri setup
Running `"rustup" "component" "add" "rust-src"` to install the `rust-src` component for the selected toolchain.
error: stage2 is a custom toolchain
fatal error: failed to install the `rust-src` component for the selected toolchain
```

it's looking for `$sysroot/lib/rustlib/src/rust/library` and that simply doesn't exists for `x build`.

cc `@jyn514` (I thought you might be interested on this, since you did few review iterations on previous PRs of adding tools to sysroot)

--

**Update**

Now we are able to use `miri` as well.

After running `x b miri cargo-miri --stage 2`, I am able to run `cargo +stage2 miri setup` which works as expected.

Resolves #110625
Resolves #97762
Resolves #81431

src/bootstrap/compile.rs

@@ -1328,7 +1328,6 @@ impl Step for Sysroot {
                     true
                 }
             });
-            return INTERNER.intern_path(sysroot);
         }
 
         // Symlink the source root into the same location inside the sysroot,

src/bootstrap/tool.rs

@@ -748,6 +748,7 @@ macro_rules! tool_extended {
        stable = $stable:expr
        $(,tool_std = $tool_std:literal)?
        $(,allow_features = $allow_features:expr)?
+       $(,add_bins_to_sysroot = $add_bins_to_sysroot:expr)?
        ;)+) => {
         $(
             #[derive(Debug, Clone, Hash, PartialEq, Eq)]
@@ -790,7 +791,7 @@ macro_rules! tool_extended {
 
             #[allow(unused_mut)]
             fn run(mut $sel, $builder: &Builder<'_>) -> Option<PathBuf> {
-                $builder.ensure(ToolBuild {
+                let tool = $builder.ensure(ToolBuild {
                     compiler: $sel.compiler,
                     target: $sel.target,
                     tool: $tool_name,
@@ -800,7 +801,27 @@ macro_rules! tool_extended {
                     is_optional_tool: true,
                     source_type: SourceType::InTree,
                     allow_features: concat!($($allow_features)*),
-                })
+                })?;
+
+                if (false $(|| !$add_bins_to_sysroot.is_empty())?) && $sel.compiler.stage > 0 {
+                    let bindir = $builder.sysroot($sel.compiler).join("bin");
+                    t!(fs::create_dir_all(&bindir));
+
+                    #[allow(unused_variables)]
+                    let tools_out = $builder
+                        .cargo_out($sel.compiler, Mode::ToolRustc, $sel.target);
+
+                    $(for add_bin in $add_bins_to_sysroot {
+                        let bin_source = tools_out.join(exe(add_bin, $sel.target));
+                        let bin_destination = bindir.join(exe(add_bin, $sel.compiler.host));
+                        $builder.copy(&bin_source, &bin_destination);
+                    })?
+
+                    let tool = bindir.join(exe($tool_name, $sel.compiler.host));
+                    Some(tool)
+                } else {
+                    Some(tool)
+                }
             }
         }
         )+
@@ -814,15 +835,15 @@ macro_rules! tool_extended {
 tool_extended!((self, builder),
     Cargofmt, "src/tools/rustfmt", "cargo-fmt", stable=true;
     CargoClippy, "src/tools/clippy", "cargo-clippy", stable=true;
-    Clippy, "src/tools/clippy", "clippy-driver", stable=true;
+    Clippy, "src/tools/clippy", "clippy-driver", stable=true, add_bins_to_sysroot = ["clippy-driver", "cargo-clippy"];
-    Miri, "src/tools/miri", "miri", stable=false;
+    Miri, "src/tools/miri", "miri", stable=false, add_bins_to_sysroot = ["miri"];
-    CargoMiri, "src/tools/miri/cargo-miri", "cargo-miri", stable=true;
+    CargoMiri, "src/tools/miri/cargo-miri", "cargo-miri", stable=true, add_bins_to_sysroot = ["cargo-miri"];
     // FIXME: tool_std is not quite right, we shouldn't allow nightly features.
     // But `builder.cargo` doesn't know how to handle ToolBootstrap in stages other than 0,
     // and this is close enough for now.
     Rls, "src/tools/rls", "rls", stable=true, tool_std=true;
     RustDemangler, "src/tools/rust-demangler", "rust-demangler", stable=false, tool_std=true;
-    Rustfmt, "src/tools/rustfmt", "rustfmt", stable=true;
+    Rustfmt, "src/tools/rustfmt", "rustfmt", stable=true, add_bins_to_sysroot = ["rustfmt", "cargo-fmt"];
 );
 
 impl<'a> Builder<'a> {