2 files changed, 25 insertions, 3 deletions

diff --git a/crates/ra_project_model/src/cargo_workspace.rs b/crates/ra_project_model/src/cargo_workspace.rs
index 4027f020f..eb9f33ee8 100644
--- a/crates/ra_project_model/src/cargo_workspace.rs
+++ b/crates/ra_project_model/src/cargo_workspace.rs
@@ -87,6 +87,7 @@ pub struct PackageData {
     pub dependencies: Vec<PackageDependency>,
     pub edition: Edition,
     pub features: Vec<String>,
+    pub cfgs: Vec<String>,
     pub out_dir: Option<PathBuf>,
     pub proc_macro_dylib_path: Option<PathBuf>,
 }
@@ -168,10 +169,12 @@ impl CargoWorkspace {
         })?;
 
         let mut out_dir_by_id = FxHashMap::default();
+        let mut cfgs = FxHashMap::default();
         let mut proc_macro_dylib_paths = FxHashMap::default();
         if cargo_features.load_out_dirs_from_check {
             let resources = load_extern_resources(cargo_toml, cargo_features)?;
             out_dir_by_id = resources.out_dirs;
+            cfgs = resources.cfgs;
             proc_macro_dylib_paths = resources.proc_dylib_paths;
         }
 
@@ -197,6 +200,7 @@ impl CargoWorkspace {
                 edition,
                 dependencies: Vec::new(),
                 features: Vec::new(),
+                cfgs: cfgs.get(&id).cloned().unwrap_or_default(),
                 out_dir: out_dir_by_id.get(&id).cloned(),
                 proc_macro_dylib_path: proc_macro_dylib_paths.get(&id).cloned(),
             });
@@ -278,6 +282,7 @@ impl CargoWorkspace {
 pub struct ExternResources {
     out_dirs: FxHashMap<PackageId, PathBuf>,
     proc_dylib_paths: FxHashMap<PackageId, PathBuf>,
+    cfgs: FxHashMap<PackageId, Vec<String>>,
 }
 
 pub fn load_extern_resources(
@@ -303,8 +308,14 @@ pub fn load_extern_resources(
     for message in cargo_metadata::parse_messages(output.stdout.as_slice()) {
         if let Ok(message) = message {
             match message {
-                Message::BuildScriptExecuted(BuildScript { package_id, out_dir, .. }) => {
-                    res.out_dirs.insert(package_id, out_dir);
+                Message::BuildScriptExecuted(BuildScript { package_id, out_dir, cfgs, .. }) => {
+                    res.out_dirs.insert(package_id.clone(), out_dir);
+                    res.cfgs.insert(
+                        package_id,
+                        // FIXME: Current `cargo_metadata` uses `PathBuf` instead of `String`,
+                        // change when https://github.com/oli-obk/cargo_metadata/pulls/112 reaches crates.io
+                        cfgs.iter().filter_map(|c| c.to_str().map(|s| s.to_owned())).collect(),
+                    );
                 }
 
                 Message::CompilerArtifact(message) => {
diff --git a/crates/ra_project_model/src/lib.rs b/crates/ra_project_model/src/lib.rs
index e4b86f1e2..88a6ffb2a 100644
--- a/crates/ra_project_model/src/lib.rs
+++ b/crates/ra_project_model/src/lib.rs
@@ -399,7 +399,18 @@ impl ProjectWorkspace {
                             let edition = cargo[pkg].edition;
                             let cfg_options = {
                                 let mut opts = default_cfg_options.clone();
-                                opts.insert_features(cargo[pkg].features.iter().map(Into::into));
+                                for feature in cargo[pkg].features.iter() {
+                                    opts.insert_key_value("feature".into(), feature.into());
+                                }
+                                for cfg in cargo[pkg].cfgs.iter() {
+                                    match cfg.find('=') {
+                                        Some(split) => opts.insert_key_value(
+                                            cfg[..split].into(),
+                                            cfg[split + 1..].trim_matches('"').into(),
+                                        ),
+                                        None => opts.insert_atom(cfg.into()),
+                                    };
+                                }
                                 opts
                             };
                             let mut env = Env::default();