Disable ARM ehabi when building without landing pads

Author: bharrisau

src/librustc/back/link.rs

@@ -337,8 +337,13 @@ pub mod write {
             llvm_c_strs.push(s);
         };
         add("rustc"); // fake program name
-        add("-arm-enable-ehabi");
-        add("-arm-enable-ehabi-descriptors");
+
+        // Only enable ARM EHABI if we are unwinding
+        if !sess.no_landing_pads() {
+            add("-arm-enable-ehabi");
+            add("-arm-enable-ehabi-descriptors");
+        }
+
         if vectorize_loop { add("-vectorize-loops"); }
         if vectorize_slp  { add("-vectorize-slp");   }
         if sess.time_llvm_passes() { add("-time-passes"); }