--- /dev/null
+++ dyld/dyld-1330/cache_builder/Error.h
@@ -0,0 +1,70 @@
+/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
+*
+* Copyright (c) 2017 Apple Inc. All rights reserved.
+*
+* @APPLE_LICENSE_HEADER_START@
+*
+* This file contains Original Code and/or Modifications of Original Code
+* as defined in and that are subject to the Apple Public Source License
+* Version 2.0 (the 'License'). You may not use this file except in
+* compliance with the License. Please obtain a copy of the License at
+* http://www.opensource.apple.com/apsl/ and read it before using this
+* file.
+*
+* The Original Code and all software distributed under the License are
+* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+* Please see the License for the specific language governing rights and
+* limitations under the License.
+*
+* @APPLE_LICENSE_HEADER_END@
+*/
+
+#ifndef Error_hpp
+#define Error_hpp
+
+#include "Defines.h"
+
+#include <stdarg.h>
+
+namespace error
+{
+
+/*!
+ * @class Error
+ *
+ * @abstract
+ *      Class for capturing error messages.
+ *      Can be constructed with printf style format strings.
+ *      Returned by mach-o "valid" methods.
+ */
+class VIS_HIDDEN [[nodiscard]] Error
+{
+public:
+                    Error() = default;
+                    Error(const char* format, ...)  __attribute__((format(printf, 2, 3)));
+                    Error(const Error&) = delete;  // can't copy
+                    Error(Error&&); // can move
+                    Error& operator=(const Error&) = delete; //  can't copy assign
+                    Error& operator=(Error&&); // can move
+                    ~Error();
+
+
+    bool            hasError() const { return (_buffer != nullptr); }
+    bool            noError() const  { return (_buffer == nullptr); }
+    explicit        operator bool() const { return hasError(); }
+    const char*     message() const;
+    bool            messageContains(const char* subString) const;
+
+    static Error    none() { return Error(); }
+
+private:
+
+    void*           _buffer = nullptr;
+};
+
+} // namespace error
+
+#endif /* Error_hpp */