--- dyld/dyld-1335/cache_builder/Error.cpp
+++ dyld/dyld-1241.17/cache_builder/Error.cpp
@@ -72,6 +72,17 @@
     va_end(list);
 }
 
+Error::Error(const char* format, va_list list)
+{
+    if ( _buffer == nullptr )
+        _buffer = _simple_salloc();
+// FIXME: Remove ignore once rdar://84603673 is resolved.
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wformat-nonliteral"
+    _simple_vsprintf(_buffer, format, list);
+#pragma clang diagnostic pop
+}
+
 const char* Error::message() const
 {
     return _buffer ? _simple_string(_buffer) : "";