Don't add --all-targets to runnables for no-std crates

crates/hir-def/src/nameres.rs

@@ -127,6 +127,8 @@ pub struct DefMap {
     unstable_features: FxHashSet<SmolStr>,
     /// #[rustc_coherence_is_core]
     rustc_coherence_is_core: bool,
+    no_core: bool,
+    no_std: bool,
 
     edition: Edition,
     recursion_limit: Option<u32>,
@@ -294,6 +296,8 @@ impl DefMap {
             unstable_features: FxHashSet::default(),
             diagnostics: Vec::new(),
             rustc_coherence_is_core: false,
+            no_core: false,
+            no_std: false,
         }
     }
 
@@ -331,6 +335,10 @@ impl DefMap {
         self.rustc_coherence_is_core
     }
 
+    pub fn is_no_std(&self) -> bool {
+        self.no_std || self.no_core
+    }
+
     pub fn root(&self) -> LocalModuleId {
         self.root
     }
@@ -528,6 +536,8 @@ impl DefMap {
             prelude: _,
             root: _,
             rustc_coherence_is_core: _,
+            no_core: _,
+            no_std: _,
         } = self;
 
         extern_prelude.shrink_to_fit();

crates/hir-def/src/nameres/collector.rs

@@ -291,8 +291,6 @@ impl DefCollector<'_> {
 
         let attrs = item_tree.top_level_attrs(self.db, self.def_map.krate);
 
-        self.inject_prelude(&attrs);
-
         // Process other crate-level attributes.
         for attr in &*attrs {
             if let Some(cfg) = attr.cfg() {
@@ -321,6 +319,16 @@ impl DefCollector<'_> {
                 continue;
             }
 
+            if *attr_name == hir_expand::name![no_core] {
+                self.def_map.no_core = true;
+                continue;
+            }
+
+            if *attr_name == hir_expand::name![no_std] {
+                self.def_map.no_std = true;
+                continue;
+            }
+
             if attr_name.as_text().as_deref() == Some("rustc_coherence_is_core") {
                 self.def_map.rustc_coherence_is_core = true;
                 continue;
@@ -359,6 +367,8 @@ impl DefCollector<'_> {
             }
         }
 
+        self.inject_prelude();
+
         ModCollector {
             def_collector: self,
             macro_depth: 0,
@@ -517,15 +527,15 @@ impl DefCollector<'_> {
         }
     }
 
-    fn inject_prelude(&mut self, crate_attrs: &Attrs) {
+    fn inject_prelude(&mut self) {
         // See compiler/rustc_builtin_macros/src/standard_library_imports.rs
 
-        if crate_attrs.by_key("no_core").exists() {
+        if self.def_map.no_core {
             // libcore does not get a prelude.
             return;
         }
 
-        let krate = if crate_attrs.by_key("no_std").exists() {
+        let krate = if self.def_map.no_std {
             name![core]
         } else {
             let std = name![std];

crates/hir-expand/src/name.rs

@@ -366,6 +366,8 @@ pub mod known {
         crate_type,
         derive,
         global_allocator,
+        no_core,
+        no_std,
         test,
         test_case,
         recursion_limit,

crates/ide/src/lib.rs

@@ -531,6 +531,11 @@ impl Analysis {
         self.with_db(|db| db.crate_graph()[crate_id].edition)
     }
 
+    /// Returns true if this crate has `no_std` or `no_core` specified.
+    pub fn is_crate_no_std(&self, crate_id: CrateId) -> Cancellable<bool> {
+        self.with_db(|db| hir::db::DefDatabase::crate_def_map(db, crate_id).is_no_std())
+    }
+
     /// Returns the root file of the given crate.
     pub fn crate_root(&self, crate_id: CrateId) -> Cancellable<FileId> {
         self.with_db(|db| db.crate_graph()[crate_id].root_file_id)

crates/rust-analyzer/src/cargo_target_spec.rs

@@ -3,7 +3,7 @@
 use std::mem;
 
 use cfg::{CfgAtom, CfgExpr};
-use ide::{Cancellable, FileId, RunnableKind, TestId};
+use ide::{Cancellable, CrateId, FileId, RunnableKind, TestId};
 use project_model::{self, CargoFeatures, ManifestPath, TargetKind};
 use rustc_hash::FxHashSet;
 use vfs::AbsPathBuf;
@@ -21,6 +21,7 @@ pub(crate) struct CargoTargetSpec {
     pub(crate) package: String,
     pub(crate) target: String,
     pub(crate) target_kind: TargetKind,
+    pub(crate) crate_id: CrateId,
     pub(crate) required_features: Vec<String>,
     pub(crate) features: FxHashSet<String>,
 }
@@ -142,6 +143,7 @@ impl CargoTargetSpec {
             target_kind: target_data.kind,
             required_features: target_data.required_features.clone(),
             features: package_data.features.keys().cloned().collect(),
+            crate_id,
         };
 
         Ok(Some(res))

crates/rust-analyzer/src/handlers/request.rs

@@ -768,20 +768,25 @@ pub(crate) fn handle_runnables(
     let config = snap.config.runnables();
     match cargo_spec {
         Some(spec) => {
+            let all_targets = !snap.analysis.is_crate_no_std(spec.crate_id)?;
             for cmd in ["check", "test"] {
+                let mut cargo_args =
+                    vec![cmd.to_owned(), "--package".to_owned(), spec.package.clone()];
+                if all_targets {
+                    cargo_args.push("--all-targets".to_owned());
+                }
                 res.push(lsp_ext::Runnable {
-                    label: format!("cargo {cmd} -p {} --all-targets", spec.package),
+                    label: format!(
+                        "cargo {cmd} -p {}{all_targets}",
+                        spec.package,
+                        all_targets = if all_targets { " --all-targets" } else { "" }
+                    ),
                     location: None,
                     kind: lsp_ext::RunnableKind::Cargo,
                     args: lsp_ext::CargoRunnable {
                         workspace_root: Some(spec.workspace_root.clone().into()),
                         override_cargo: config.override_cargo.clone(),
-                        cargo_args: vec![
+                        cargo_args,
-                            cmd.to_string(),
-                            "--package".to_string(),
-                            spec.package.clone(),
-                            "--all-targets".to_string(),
-                        ],
                         cargo_extra_args: config.cargo_extra_args.clone(),
                         executable_args: Vec::new(),
                         expect_test: None,