Run clippy both with and without default features on the GCC backend

Author: GuillaumeGomez

src/bootstrap/src/core/build_steps/clippy.rs

@@ -379,10 +379,34 @@ impl Step for CodegenGcc {
         let stamp = BuildStamp::new(&builder.cargo_out(build_compiler, Mode::Codegen, target))
             .with_prefix("rustc_codegen_gcc-check");
 
+        let args = lint_args(builder, &self.config, &[]);
         run_cargo(
             builder,
             cargo,
-            lint_args(builder, &self.config, &[]),
+            args.clone(),
+            &stamp,
+            vec![],
+            true,
+            false,
+        );
+
+        // Same but we disable the features enabled by default.
+        let mut cargo = prepare_tool_cargo(
+            builder,
+            build_compiler,
+            Mode::Codegen,
+            target,
+            Kind::Clippy,
+            "compiler/rustc_codegen_gcc",
+            SourceType::InTree,
+            &[],
+        );
+        self.build_compiler.configure_cargo(&mut cargo);
+        cargo.arg("--no-default-features");
+        run_cargo(
+            builder,
+            cargo,
+            args,
             &stamp,
             vec![],
             true,