diff --git a/llvm/utils/gn/build/toolchain/BUILD.gn b/llvm/utils/gn/build/toolchain/BUILD.gn
--- a/llvm/utils/gn/build/toolchain/BUILD.gn
+++ b/llvm/utils/gn/build/toolchain/BUILD.gn
@@ -174,7 +174,11 @@
 
 unix_toolchain("unix") {
   if (current_os != "ios" && current_os != "mac") {
-    ar = "ar"
+    if (clang_base_path != "") {
+      ar = rebase_path(clang_base_path, root_build_dir) + "/bin/llvm-ar"
+    } else {
+      ar = "ar"
+    }
   }
 
   toolchain_args = {