improve check::{Std, Rustc} to handle clippy properly

Signed-off-by: onur-ozkan <work@onurozkan.dev>

src/bootstrap/src/core/build_steps/check.rs

@@ -20,11 +20,22 @@ pub struct Std {
     ///
     /// [`compile::Rustc`]: crate::core::build_steps::compile::Rustc
     crates: Vec<String>,
+    /// Override `Builder::kind` on cargo invocations.
+    ///
+    /// By default, `Builder::kind` is propagated as the subcommand to the cargo invocations.
+    /// However, there are cases when this is not desirable. For example, when running `x clippy $tool_name`,
+    /// passing `Builder::kind` to cargo invocations would run clippy on the entire compiler and library,
+    /// which is not useful if we only want to lint a few crates with specific rules.
+    override_build_kind: Option<Kind>,
 }
 
 impl Std {
     pub fn new(target: TargetSelection) -> Self {
-        Self { target, crates: vec![] }
+        Self::new_with_build_kind(target, None)
+    }
+
+    pub fn new_with_build_kind(target: TargetSelection, kind: Option<Kind>) -> Self {
+        Self { target, crates: vec![], override_build_kind: kind }
     }
 }
 
@@ -38,7 +49,7 @@ fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
 
     fn make_run(run: RunConfig<'_>) {
         let crates = run.make_run_crates(Alias::Library);
-        run.builder.ensure(Std { target: run.target, crates });
+        run.builder.ensure(Std { target: run.target, crates, override_build_kind: None });
     }
 
     fn run(self, builder: &Builder<'_>) {
@@ -53,7 +64,7 @@ fn run(self, builder: &Builder<'_>) {
             Mode::Std,
             SourceType::InTree,
             target,
-            builder.kind,
+            self.override_build_kind.unwrap_or(builder.kind),
         );
 
         std_cargo(builder, target, compiler.stage, &mut cargo);
@@ -107,7 +118,7 @@ fn run(self, builder: &Builder<'_>) {
             Mode::Std,
             SourceType::InTree,
             target,
-            builder.kind,
+            self.override_build_kind.unwrap_or(builder.kind),
         );
 
         // If we're not in stage 0, tests and examples will fail to compile
@@ -148,16 +159,31 @@ pub struct Rustc {
     ///
     /// [`compile::Rustc`]: crate::core::build_steps::compile::Rustc
     crates: Vec<String>,
+    /// Override `Builder::kind` on cargo invocations.
+    ///
+    /// By default, `Builder::kind` is propagated as the subcommand to the cargo invocations.
+    /// However, there are cases when this is not desirable. For example, when running `x clippy $tool_name`,
+    /// passing `Builder::kind` to cargo invocations would run clippy on the entire compiler and library,
+    /// which is not useful if we only want to lint a few crates with specific rules.
+    override_build_kind: Option<Kind>,
 }
 
 impl Rustc {
     pub fn new(target: TargetSelection, builder: &Builder<'_>) -> Self {
+        Self::new_with_build_kind(target, builder, None)
+    }
+
+    pub fn new_with_build_kind(
+        target: TargetSelection,
+        builder: &Builder<'_>,
+        kind: Option<Kind>,
+    ) -> Self {
         let crates = builder
             .in_tree_crates("rustc-main", Some(target))
             .into_iter()
             .map(|krate| krate.name.to_string())
             .collect();
-        Self { target, crates }
+        Self { target, crates, override_build_kind: kind }
     }
 }
 
@@ -172,7 +198,7 @@ fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
 
     fn make_run(run: RunConfig<'_>) {
         let crates = run.make_run_crates(Alias::Compiler);
-        run.builder.ensure(Rustc { target: run.target, crates });
+        run.builder.ensure(Rustc { target: run.target, crates, override_build_kind: None });
     }
 
     /// Builds the compiler.
@@ -193,7 +219,7 @@ fn run(self, builder: &Builder<'_>) {
             builder.ensure(crate::core::build_steps::compile::Std::new(compiler, compiler.host));
             builder.ensure(crate::core::build_steps::compile::Std::new(compiler, target));
         } else {
-            builder.ensure(Std::new(target));
+            builder.ensure(Std::new_with_build_kind(target, self.override_build_kind));
         }
 
         let mut cargo = builder::Cargo::new(
@@ -202,7 +228,7 @@ fn run(self, builder: &Builder<'_>) {
             Mode::Rustc,
             SourceType::InTree,
             target,
-            builder.kind,
+            self.override_build_kind.unwrap_or(builder.kind),
         );
 
         rustc_cargo(builder, &mut cargo, target, &compiler);

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

@@ -200,7 +200,7 @@ fn run(self, builder: &Builder<'_>) {
             builder.ensure(compile::Std::new(compiler, compiler.host));
             builder.ensure(compile::Std::new(compiler, target));
         } else {
-            builder.ensure(check::Std::new(target));
+            builder.ensure(check::Std::new_with_build_kind(target, Some(Kind::Check)));
         }
 
         let mut cargo = builder::Cargo::new(
@@ -267,7 +267,7 @@ fn run(self, builder: &Builder<'_>) -> Self::Output {
                 let compiler = builder.compiler(builder.top_stage, builder.config.build);
                 let target = self.target;
 
-                builder.ensure(check::Rustc::new(target, builder));
+                builder.ensure(check::Rustc::new_with_build_kind(target, builder, Some(Kind::Check)));
 
                 let cargo = prepare_tool_cargo(
                     builder,

src/bootstrap/src/core/builder.rs

@@ -689,7 +689,7 @@ fn pathset_for_paths_removing_matches(
     }
 }
 
-#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, ValueEnum)]
+#[derive(Debug, Copy, Clone, Eq, Hash, PartialEq, PartialOrd, Ord, ValueEnum)]
 pub enum Kind {
     #[value(alias = "b")]
     Build,