1 files changed, 34 insertions, 9 deletions
diff --git a/compiler/rustc_driver_impl/src/lib.rs b/compiler/rustc_driver_impl/src/lib.rs
index 37755e7d61d..6fb01bf415a 100644
--- a/compiler/rustc_driver_impl/src/lib.rs
+++ b/compiler/rustc_driver_impl/src/lib.rs
@@ -64,6 +64,7 @@ use rustc_session::lint::{Lint, LintId};
 use rustc_session::output::{CRATE_TYPES, collect_crate_types, invalid_output_for_target};
 use rustc_session::{EarlyDiagCtxt, Session, config, filesearch};
 use rustc_span::FileName;
+use rustc_span::def_id::LOCAL_CRATE;
 use rustc_target::json::ToJson;
 use rustc_target::spec::{Target, TargetTuple};
 use time::OffsetDateTime;
@@ -392,14 +393,10 @@ pub fn run_compiler(at_args: &[String], callbacks: &mut (dyn Callbacks + Send))
 }
 
 fn dump_feature_usage_metrics(tcxt: TyCtxt<'_>, metrics_dir: &Path) {
-    let output_filenames = tcxt.output_filenames(());
-    let mut metrics_file_name = std::ffi::OsString::from("unstable_feature_usage_metrics-");
-    let mut metrics_path = output_filenames.with_directory_and_extension(metrics_dir, "json");
-    let metrics_file_stem =
-        metrics_path.file_name().expect("there should be a valid default output filename");
-    metrics_file_name.push(metrics_file_stem);
-    metrics_path.pop();
-    metrics_path.push(metrics_file_name);
+    let hash = tcxt.crate_hash(LOCAL_CRATE);
+    let crate_name = tcxt.crate_name(LOCAL_CRATE);
+    let metrics_file_name = format!("unstable_feature_usage_metrics-{crate_name}-{hash}.json");
+    let metrics_path = metrics_dir.join(metrics_file_name);
     if let Err(error) = tcxt.features().dump_feature_usage_metrics(metrics_path) {
         // FIXME(yaahc): once metrics can be enabled by default we will want "failure to emit
         // default metrics" to only produce a warning when metrics are enabled by default and emit
@@ -691,6 +688,34 @@ fn print_crate_info(
                 };
                 println_info!("{}", passes::get_crate_name(sess, attrs));
             }
+            CrateRootLintLevels => {
+                let Some(attrs) = attrs.as_ref() else {
+                    // no crate attributes, print out an error and exit
+                    return Compilation::Continue;
+                };
+                let crate_name = passes::get_crate_name(sess, attrs);
+                let lint_store = crate::unerased_lint_store(sess);
+                let registered_tools = rustc_resolve::registered_tools_ast(sess.dcx(), attrs);
+                let features = rustc_expand::config::features(sess, attrs, crate_name);
+                let lint_levels = rustc_lint::LintLevelsBuilder::crate_root(
+                    sess,
+                    &features,
+                    true,
+                    lint_store,
+                    &registered_tools,
+                    attrs,
+                );
+                for lint in lint_store.get_lints() {
+                    if let Some(feature_symbol) = lint.feature_gate
+                        && !features.enabled(feature_symbol)
+                    {
+                        // lint is unstable and feature gate isn't active, don't print
+                        continue;
+                    }
+                    let level = lint_levels.lint_level(lint).level;
+                    println_info!("{}={}", lint.name_lower(), level.as_str());
+                }
+            }
             Cfg => {
                 let mut cfgs = sess
                     .psess
@@ -779,7 +804,7 @@ fn print_crate_info(
                 }
             }
             DeploymentTarget => {
-                if sess.target.is_like_osx {
+                if sess.target.is_like_darwin {
                     println_info!(
                         "{}={}",
                         apple::deployment_target_env_var(&sess.target.os),