use stage 2 on cargo and clippy tests when possible

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

Author: onur-ozkan

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

@@ -293,17 +293,27 @@ impl Step for Cargo {
     }
 
     fn make_run(run: RunConfig<'_>) {
-        run.builder.ensure(Cargo { stage: run.builder.top_stage, host: run.target });
+        // If stage is explicitly set or not lower than 2, keep it. Otherwise, make sure it's at least 2
+        // as tests for this step don't work with a lower stage.
+        let stage = if run.builder.config.is_explicit_stage() || run.builder.top_stage >= 2 {
+            run.builder.top_stage
+        } else {
+            2
+        };
+
+        run.builder.ensure(Cargo { stage, host: run.target });
     }
 
     /// Runs `cargo test` for `cargo` packaged with Rust.
     fn run(self, builder: &Builder<'_>) {
-        if self.stage < 2 {
-            eprintln!("WARNING: cargo tests on stage {} may not behave well.", self.stage);
+        let stage = self.stage;
+
+        if stage < 2 {
+            eprintln!("WARNING: cargo tests on stage {stage} may not behave well.");
             eprintln!("HELP: consider using stage 2");
         }
 
-        let compiler = builder.compiler(self.stage, self.host);
+        let compiler = builder.compiler(stage, self.host);
 
         let cargo = builder.ensure(tool::Cargo { compiler, target: self.host });
         let compiler = cargo.build_compiler;
@@ -340,7 +350,7 @@ impl Step for Cargo {
                 crates: vec!["cargo".into()],
                 target: self.host.triple.to_string(),
                 host: self.host.triple.to_string(),
-                stage: self.stage,
+                stage,
             },
             builder,
         );
@@ -739,7 +749,15 @@ impl Step for Clippy {
     }
 
     fn make_run(run: RunConfig<'_>) {
-        run.builder.ensure(Clippy { stage: run.builder.top_stage, host: run.target });
+        // If stage is explicitly set or not lower than 2, keep it. Otherwise, make sure it's at least 2
+        // as tests for this step don't work with a lower stage.
+        let stage = if run.builder.config.is_explicit_stage() || run.builder.top_stage >= 2 {
+            run.builder.top_stage
+        } else {
+            2
+        };
+
+        run.builder.ensure(Clippy { stage, host: run.target });
     }
 
     /// Runs `cargo test` for clippy.

src/bootstrap/src/core/config/config.rs

@@ -2402,6 +2402,10 @@ impl Config {
         }
     }
 
+    pub fn is_explicit_stage(&self) -> bool {
+        self.explicit_stage_from_cli || self.explicit_stage_from_config
+    }
+
     /// Runs a command, printing out nice contextual information if it fails.
     /// Exits if the command failed to execute at all, otherwise returns its
     /// `status.success()`.

src/bootstrap/src/core/config/tests.rs

@@ -471,6 +471,7 @@ fn test_explicit_stage() {
 
     assert!(!config.explicit_stage_from_cli);
     assert!(config.explicit_stage_from_config);
+    assert!(config.is_explicit_stage());
 
     let config = Config::parse_inner(
         Flags::parse(&[
@@ -483,6 +484,7 @@ fn test_explicit_stage() {
 
     assert!(config.explicit_stage_from_cli);
     assert!(!config.explicit_stage_from_config);
+    assert!(config.is_explicit_stage());
 
     let config = Config::parse_inner(
         Flags::parse(&[
@@ -502,6 +504,7 @@ fn test_explicit_stage() {
 
     assert!(config.explicit_stage_from_cli);
     assert!(config.explicit_stage_from_config);
+    assert!(config.is_explicit_stage());
 
     let config = Config::parse_inner(
         Flags::parse(&["check".to_owned(), "--config=/does/not/exist".to_owned()]),
@@ -510,4 +513,5 @@ fn test_explicit_stage() {
 
     assert!(!config.explicit_stage_from_cli);
     assert!(!config.explicit_stage_from_config);
+    assert!(!config.is_explicit_stage());
 }