2 files changed, 14 insertions, 5 deletions

diff --git a/crates/ra_project_model/src/cargo_workspace.rs b/crates/ra_project_model/src/cargo_workspace.rs
index bf83adc42..16fff9f1c 100644
--- a/crates/ra_project_model/src/cargo_workspace.rs
+++ b/crates/ra_project_model/src/cargo_workspace.rs
@@ -56,6 +56,9 @@ pub struct CargoConfig {
 
     /// Runs cargo check on launch to figure out the correct values of OUT_DIR
     pub load_out_dirs_from_check: bool,
+
+    /// rustc target
+    pub target: Option<String>,
 }
 
 impl Default for CargoConfig {
@@ -65,6 +68,7 @@ impl Default for CargoConfig {
             all_features: true,
             features: Vec::new(),
             load_out_dirs_from_check: false,
+            target: None,
         }
     }
 }
@@ -161,6 +165,9 @@ impl CargoWorkspace {
         if let Some(parent) = cargo_toml.parent() {
             meta.current_dir(parent);
         }
+        if let Some(target) = cargo_features.target.as_ref() {
+            meta.other_options(&[String::from("--filter-platform"), target.clone()]);
+        }
         let meta = meta.exec().with_context(|| {
             format!("Failed to run `cargo metadata --manifest-path {}`", cargo_toml.display())
         })?;
diff --git a/crates/ra_project_model/src/lib.rs b/crates/ra_project_model/src/lib.rs
index 7231da221..8703429d4 100644
--- a/crates/ra_project_model/src/lib.rs
+++ b/crates/ra_project_model/src/lib.rs
@@ -544,7 +544,7 @@ impl ProjectWorkspace {
     }
 }
 
-pub fn get_rustc_cfg_options() -> CfgOptions {
+pub fn get_rustc_cfg_options(target: Option<&String>) -> CfgOptions {
     let mut cfg_options = CfgOptions::default();
 
     // Some nightly-only cfgs, which are required for stdlib
@@ -559,10 +559,12 @@ pub fn get_rustc_cfg_options() -> CfgOptions {
 
     match (|| -> Result<String> {
         // `cfg(test)` and `cfg(debug_assertion)` are handled outside, so we suppress them here.
-        let output = Command::new("rustc")
-            .args(&["--print", "cfg", "-O"])
-            .output()
-            .context("Failed to get output from rustc --print cfg -O")?;
+        let mut cmd = Command::new("rustc");
+        cmd.args(&["--print", "cfg", "-O"]);
+        if let Some(target) = target {
+            cmd.args(&["--target", target.as_str()]);
+        }
+        let output = cmd.output().context("Failed to get output from rustc --print cfg -O")?;
         if !output.status.success() {
             bail!(
                 "rustc --print cfg -O exited with exit code ({})",