Configure test execution for the build_helper crate in bootstrap

To enable the previously moved `DropBomb` tests.

src/bootstrap/src/core/build_steps/test.rs

@@ -1352,6 +1352,53 @@ impl Step for CrateRunMakeSupport {
  }
 }
 
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct CrateBuildHelper {
+ host: TargetSelection,
+}
+
+impl Step for CrateBuildHelper {
+ type Output = ();
+ const ONLY_HOSTS: bool = true;
+
+ fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
+ run.path("src/tools/build_helper")
+ }
+
+ fn make_run(run: RunConfig<'_>) {
+ run.builder.ensure(CrateBuildHelper { host: run.target });
+ }
+
+ /// Runs `cargo test` for build_helper.
+ fn run(self, builder: &Builder<'_>) {
+ let host = self.host;
+ let compiler = builder.compiler(builder.top_stage, host);
+
+ builder.ensure(compile::Std::new(compiler, host));
+ let mut cargo = tool::prepare_tool_cargo(
+ builder,
+ compiler,
+ Mode::ToolStd,
+ host,
+ "test",
+ "src/tools/build_helper",
+ SourceType::InTree,
+ &[],
+ );
+ cargo.allow_features("test");
+ run_cargo_test(
+ cargo,
+ &[],
+ &[],
+ "build_helper",
+ "build_helper self test",
+ compiler,
+ host,
+ builder,
+ );
+ }
+}
+
 default_test!(Ui { path: "tests/ui", mode: "ui", suite: "ui" });
 
 default_test!(Crashes { path: "tests/crashes", mode: "crashes", suite: "crashes" });

src/bootstrap/src/core/builder.rs

@@ -860,6 +860,7 @@ impl<'a> Builder<'a> {
  test::Clippy,
  test::CompiletestTest,
  test::CrateRunMakeSupport,
+ test::CrateBuildHelper,
  test::RustdocJSStd,
  test::RustdocJSNotStd,
  test::RustdocGUI,