2 files changed, 16 insertions, 4 deletions
diff --git a/src/liballoc/lib.rs b/src/liballoc/lib.rs
index 493448eaf88..35bf8d1b792 100644
--- a/src/liballoc/lib.rs
+++ b/src/liballoc/lib.rs
@@ -162,7 +162,10 @@ mod boxed {
 #[cfg(test)]
 mod boxed_test;
 pub mod collections;
-#[cfg(target_has_atomic = "ptr")]
+#[cfg(any(
+    all(stage0, target_has_atomic = "ptr"),
+    all(not(stage0), target_has_atomic = "ptr", target_has_atomic = "cas")
+))]
 pub mod sync;
 pub mod rc;
 pub mod raw_vec;
diff --git a/src/liballoc/task.rs b/src/liballoc/task.rs
index f14fe3a20da..9792d52dd66 100644
--- a/src/liballoc/task.rs
+++ b/src/liballoc/task.rs
@@ -12,10 +12,16 @@
 
 pub use core::task::*;
 
-#[cfg(target_has_atomic = "ptr")]
+#[cfg(any(
+    all(stage0, target_has_atomic = "ptr"),
+    all(not(stage0), target_has_atomic = "ptr", target_has_atomic = "cas")
+))]
 pub use self::if_arc::*;
 
-#[cfg(target_has_atomic = "ptr")]
+#[cfg(any(
+    all(stage0, target_has_atomic = "ptr"),
+    all(not(stage0), target_has_atomic = "ptr", target_has_atomic = "cas")
+))]
 mod if_arc {
     use super::*;
     use core::marker::PhantomData;
@@ -47,7 +53,10 @@ mod if_arc {
         }
     }
 
-    #[cfg(target_has_atomic = "ptr")]
+    #[cfg(any(
+        all(stage0, target_has_atomic = "ptr"),
+        all(not(stage0), target_has_atomic = "ptr", target_has_atomic = "cas")
+    ))]
     struct ArcWrapped<T>(PhantomData<T>);
 
     unsafe impl<T: Wake + 'static> UnsafeWake for ArcWrapped<T> {