diff --git a/src/bootstrap/builder.rs b/src/bootstrap/builder.rs
index 8b144f1463579..c8285c85d0358 100644
--- a/src/bootstrap/builder.rs
+++ b/src/bootstrap/builder.rs
@@ -621,6 +621,7 @@ impl<'a> Builder<'a> {
                 check::CodegenBackend,
                 check::Clippy,
                 check::Miri,
+                check::CargoMiri,
                 check::Rls,
                 check::RustAnalyzer,
                 check::Rustfmt,
diff --git a/src/bootstrap/check.rs b/src/bootstrap/check.rs
index 229851238f1d0..4450dd7e80f95 100644
--- a/src/bootstrap/check.rs
+++ b/src/bootstrap/check.rs
@@ -451,14 +451,13 @@ macro_rules! tool_check_step {
 }
 
 tool_check_step!(Rustdoc, "src/tools/rustdoc", "src/librustdoc", SourceType::InTree);
-// Clippy and Rustfmt are hybrids. They are external tools, but use a git subtree instead
+// Clippy, miri and Rustfmt are hybrids. They are external tools, but use a git subtree instead
 // of a submodule. Since the SourceType only drives the deny-warnings
 // behavior, treat it as in-tree so that any new warnings in clippy will be
 // rejected.
 tool_check_step!(Clippy, "src/tools/clippy", SourceType::InTree);
-// Miri on the other hand is treated as out of tree, since InTree also causes it to
-// be run as part of `check`, which can fail on platforms which libffi-sys has no support for.
-tool_check_step!(Miri, "src/tools/miri", SourceType::Submodule);
+tool_check_step!(Miri, "src/tools/miri", SourceType::InTree);
+tool_check_step!(CargoMiri, "src/tools/miri/cargo-miri", SourceType::InTree);
 tool_check_step!(Rls, "src/tools/rls", SourceType::InTree);
 tool_check_step!(Rustfmt, "src/tools/rustfmt", SourceType::InTree);
 
diff --git a/src/bootstrap/doc.rs b/src/bootstrap/doc.rs
index ea06caf9c3311..5d265b9ad0c19 100644
--- a/src/bootstrap/doc.rs
+++ b/src/bootstrap/doc.rs
@@ -765,7 +765,7 @@ impl Step for Rustc {
 }
 
 macro_rules! tool_doc {
-    ($tool: ident, $should_run: literal, $path: literal, [$($krate: literal),+ $(,)?], in_tree = $in_tree:expr $(,)?) => {
+    ($tool: ident, $should_run: literal, $path: literal, [$($krate: literal),+ $(,)?] $(,)?) => {
         #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
         pub struct $tool {
             target: TargetSelection,
@@ -821,12 +821,6 @@ macro_rules! tool_doc {
                 t!(fs::create_dir_all(&out_dir));
                 t!(symlink_dir_force(&builder.config, &out, &out_dir));
 
-                let source_type = if $in_tree == true {
-                    SourceType::InTree
-                } else {
-                    SourceType::Submodule
-                };
-
                 // Build cargo command.
                 let mut cargo = prepare_tool_cargo(
                     builder,
@@ -835,7 +829,7 @@ macro_rules! tool_doc {
                     target,
                     "doc",
                     $path,
-                    source_type,
+                    SourceType::InTree,
                     &[],
                 );
 
@@ -851,38 +845,21 @@ macro_rules! tool_doc {
                 cargo.rustdocflag("--show-type-layout");
                 cargo.rustdocflag("--generate-link-to-definition");
                 cargo.rustdocflag("-Zunstable-options");
-                if $in_tree == true {
-                    builder.run(&mut cargo.into());
-                } else {
-                    // Allow out-of-tree docs to fail (since the tool might be in a broken state).
-                    if !builder.try_run(&mut cargo.into()) {
-                        builder.info(&format!(
-                            "WARNING: tool {} failed to document; ignoring failure because it is an out-of-tree tool",
-                            stringify!($tool).to_lowercase(),
-                        ));
-                    }
-                }
+                builder.run(&mut cargo.into());
             }
         }
     }
 }
 
-tool_doc!(
-    Rustdoc,
-    "rustdoc-tool",
-    "src/tools/rustdoc",
-    ["rustdoc", "rustdoc-json-types"],
-    in_tree = true
-);
+tool_doc!(Rustdoc, "rustdoc-tool", "src/tools/rustdoc", ["rustdoc", "rustdoc-json-types"],);
 tool_doc!(
     Rustfmt,
     "rustfmt-nightly",
     "src/tools/rustfmt",
     ["rustfmt-nightly", "rustfmt-config_proc_macro"],
-    in_tree = true
 );
-tool_doc!(Clippy, "clippy", "src/tools/clippy", ["clippy_utils"], in_tree = true);
-tool_doc!(Miri, "miri", "src/tools/miri", ["miri"], in_tree = false);
+tool_doc!(Clippy, "clippy", "src/tools/clippy", ["clippy_utils"]);
+tool_doc!(Miri, "miri", "src/tools/miri", ["miri"]);
 
 #[derive(Ord, PartialOrd, Debug, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct ErrorIndex {
diff --git a/src/bootstrap/test.rs b/src/bootstrap/test.rs
index 38fd2e933f863..944fc3557f8fa 100644
--- a/src/bootstrap/test.rs
+++ b/src/bootstrap/test.rs
@@ -509,7 +509,7 @@ impl Step for Miri {
             host,
             "run",
             "src/tools/miri/cargo-miri",
-            SourceType::Submodule,
+            SourceType::InTree,
             &[],
         );
         cargo.add_rustc_lib_path(builder, compiler);
@@ -557,7 +557,7 @@ impl Step for Miri {
             host,
             "test",
             "src/tools/miri",
-            SourceType::Submodule,
+            SourceType::InTree,
             &[],
         );
         cargo.add_rustc_lib_path(builder, compiler);
diff --git a/src/bootstrap/tool.rs b/src/bootstrap/tool.rs
index eec74b2675a1e..d395220694705 100644
--- a/src/bootstrap/tool.rs
+++ b/src/bootstrap/tool.rs
@@ -794,10 +794,9 @@ macro_rules! tool_extended {
        $($name:ident,
        $path:expr,
        $tool_name:expr,
-       stable = $stable:expr,
-       $(in_tree = $in_tree:expr,)?
-       $(tool_std = $tool_std:literal,)?
-       $extra_deps:block;)+) => {
+       stable = $stable:expr
+       $(,tool_std = $tool_std:literal)?
+       ;)+) => {
         $(
             #[derive(Debug, Clone, Hash, PartialEq, Eq)]
         pub struct $name {
@@ -839,7 +838,6 @@ macro_rules! tool_extended {
 
             #[allow(unused_mut)]
             fn run(mut $sel, $builder: &Builder<'_>) -> Option<PathBuf> {
-                $extra_deps
                 $builder.ensure(ToolBuild {
                     compiler: $sel.compiler,
                     target: $sel.target,
@@ -848,11 +846,7 @@ macro_rules! tool_extended {
                     path: $path,
                     extra_features: $sel.extra_features,
                     is_optional_tool: true,
-                    source_type: if false $(|| $in_tree)* {
-                        SourceType::InTree
-                    } else {
-                        SourceType::Submodule
-                    },
+                    source_type: SourceType::InTree,
                 })
             }
         }
@@ -865,17 +859,17 @@ macro_rules! tool_extended {
 // Note: Most submodule updates for tools are handled by bootstrap.py, since they're needed just to
 // invoke Cargo to build bootstrap. See the comment there for more details.
 tool_extended!((self, builder),
-    Cargofmt, "src/tools/rustfmt", "cargo-fmt", stable=true, in_tree=true, {};
-    CargoClippy, "src/tools/clippy", "cargo-clippy", stable=true, in_tree=true, {};
-    Clippy, "src/tools/clippy", "clippy-driver", stable=true, in_tree=true, {};
-    Miri, "src/tools/miri", "miri", stable=false, in_tree=true, {};
-    CargoMiri, "src/tools/miri/cargo-miri", "cargo-miri", stable=false, in_tree=true, {};
+    Cargofmt, "src/tools/rustfmt", "cargo-fmt", stable=true;
+    CargoClippy, "src/tools/clippy", "cargo-clippy", stable=true;
+    Clippy, "src/tools/clippy", "clippy-driver", stable=true;
+    Miri, "src/tools/miri", "miri", stable=false;
+    CargoMiri, "src/tools/miri/cargo-miri", "cargo-miri", stable=true;
     // 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, in_tree=true, tool_std=true, {};
-    RustDemangler, "src/tools/rust-demangler", "rust-demangler", stable=false, in_tree=true, tool_std=true, {};
-    Rustfmt, "src/tools/rustfmt", "rustfmt", stable=true, in_tree=true, {};
+    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;
 );
 
 impl<'a> Builder<'a> {
diff --git a/src/tools/miri/src/lib.rs b/src/tools/miri/src/lib.rs
index f55c0b43e39bc..3b73d05907b4e 100644
--- a/src/tools/miri/src/lib.rs
+++ b/src/tools/miri/src/lib.rs
@@ -38,6 +38,8 @@
     clippy::cast_lossless,
     clippy::cast_possible_truncation,
 )]
+// Needed for rustdoc from bootstrap (with `-Znormalize-docs`).
+#![recursion_limit = "256"]
 
 extern crate rustc_apfloat;
 extern crate rustc_ast;