--- a/clang/test/Driver/response-file.c	Mon May 25 11:55:54 2020 +0900
+++ b/clang/test/Driver/response-file.c	Tue Jun 08 06:07:14 2021 +0900
@@ -13,7 +13,7 @@
 // But there's no guarantee that we actually will (the system limit could be
 // *huge*), so just check that invoking cc1 succeeds under these conditions.
 //
-// RUN: %clang -E %S/Inputs/gen-response.c | grep DTEST > %t.1.txt
+// RUN: %python  -c 'print(*("-DTEST" for x in range(300000)))' >%t.1.txt
 // RUN: %clang -E @%t.1.txt %s -v 2>&1 | FileCheck %s -check-prefix=LONG
 // LONG: extern int it_works;