Index: libcxx/include/__bsd_locale_fallbacks.h
===================================================================
--- libcxx/include/__bsd_locale_fallbacks.h
+++ libcxx/include/__bsd_locale_fallbacks.h
@@ -113,7 +113,10 @@
     va_list __va;
     va_start(__va, __format);
     __libcpp_locale_guard __current(__l);
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wformat-nonliteral"
     int __res = vsnprintf(__s, __n, __format, __va);
+#pragma clang diagnostic pop
     va_end(__va);
     return __res;
 }
@@ -123,7 +126,10 @@
     va_list __va;
     va_start(__va, __format);
     __libcpp_locale_guard __current(__l);
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wformat-nonliteral"
     int __res = vasprintf(__s, __format, __va);
+#pragma clang diagnostic pop
     va_end(__va);
     return __res;
 }
@@ -133,7 +139,10 @@
     va_list __va;
     va_start(__va, __format);
     __libcpp_locale_guard __current(__l);
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wformat-nonliteral"
     int __res = vsscanf(__s, __format, __va);
+#pragma clang diagnostic pop
     va_end(__va);
     return __res;
 }