bootstrap: register features-status-dump as runnable tool

src/bootstrap/src/core/build_steps/run.rs

@@ -304,3 +304,34 @@ impl Step for UnicodeTableGenerator {
         cmd.run(builder);
     }
 }
+
+#[derive(Debug, PartialOrd, Ord, Clone, Hash, PartialEq, Eq)]
+pub struct FeaturesStatusDump;
+
+impl Step for FeaturesStatusDump {
+    type Output = ();
+    const ONLY_HOSTS: bool = true;
+
+    fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
+        run.path("src/tools/features-status-dump")
+    }
+
+    fn make_run(run: RunConfig<'_>) {
+        run.builder.ensure(FeaturesStatusDump);
+    }
+
+    fn run(self, builder: &Builder<'_>) {
+        let mut cmd = builder.tool_cmd(Tool::FeaturesStatusDump);
+
+        cmd.arg("--library-path");
+        cmd.arg(builder.src.join("library"));
+
+        cmd.arg("--compiler-path");
+        cmd.arg(builder.src.join("compiler"));
+
+        cmd.arg("--output-path");
+        cmd.arg(builder.out.join("features-status-dump.json"));
+
+        cmd.run(builder);
+    }
+}

src/bootstrap/src/core/build_steps/tool.rs

@@ -359,6 +359,7 @@ bootstrap_tool!(
     RustcPerfWrapper, "src/tools/rustc-perf-wrapper", "rustc-perf-wrapper";
     WasmComponentLd, "src/tools/wasm-component-ld", "wasm-component-ld", is_unstable_tool = true, allow_features = "min_specialization";
     UnicodeTableGenerator, "src/tools/unicode-table-generator", "unicode-table-generator";
+    FeaturesStatusDump, "src/tools/features-status-dump", "features-status-dump";
 );
 
 /// These are the submodules that are required for rustbook to work due to

src/bootstrap/src/core/builder/mod.rs

@@ -1009,6 +1009,7 @@ impl<'a> Builder<'a> {
                 run::GenerateWindowsSys,
                 run::GenerateCompletions,
                 run::UnicodeTableGenerator,
+                run::FeaturesStatusDump,
             ),
             Kind::Setup => {
                 describe!(setup::Profile, setup::Hook, setup::Link, setup::Editor)