Index: llvm/utils/gn/build/BUILD.gn
===================================================================
--- llvm/utils/gn/build/BUILD.gn
+++ llvm/utils/gn/build/BUILD.gn
@@ -185,6 +185,8 @@
 config("thin_archive") {
   if (current_os != "win" && current_os != "mac") {
     arflags = [ "-T" ]
+  } else if (current_os == "win" && use_lld) {
+    arflags = [ "/llvmlibthin" ]
   }
 }