Index: libcxx/test/support/msvc_stdlib_force_include.h
===================================================================
--- libcxx/test/support/msvc_stdlib_force_include.h
+++ libcxx/test/support/msvc_stdlib_force_include.h
@@ -13,9 +13,6 @@
 // MSVC standard library.
 
 #ifndef _LIBCXX_IN_DEVCRT
-    // Silence warnings about CRT machinery.
-    #define _CRT_SECURE_NO_WARNINGS
-
     // Avoid assertion dialogs.
     #define _CRT_SECURE_INVALID_PARAMETER(EXPR) ::abort()
 #endif // _LIBCXX_IN_DEVCRT