1 files changed, 13 insertions, 5 deletions

diff --git a/crates/ra_project_model/src/lib.rs b/crates/ra_project_model/src/lib.rs
index 731cbd291..8fa895aa6 100644
--- a/crates/ra_project_model/src/lib.rs
+++ b/crates/ra_project_model/src/lib.rs
@@ -543,7 +543,7 @@ 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
@@ -558,10 +558,18 @@ 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 output = if let Some(target) = target {
+            Command::new("rustc")
+                .args(&["--print", "cfg", "-O", "--target", target.as_str()])
+                .output()
+                .context("Failed to get output from rustc --print cfg -O")?
+        } else {
+            Command::new("rustc")
+                .args(&["--print", "cfg", "-O"])
+                .output()
+                .context("Failed to get output from rustc --print cfg -O")?
+        };
+
         if !output.status.success() {
             bail!(
                 "rustc --print cfg -O exited with exit code ({})",