Imported more library files

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Libs/Matter/third_party/nlio/include/nlio-private.h

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+/**
+ *    Copyright 2017 Nest Labs Inc. All Rights Reserved.
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/**
+ *    @file
+ *      This file defines private macros and interfaces.
+ */
+
+#ifndef NLIO_PRIVATE_H
+#define NLIO_PRIVATE_H
+
+/*
+ * If we are compiling under clang, GCC, or any such compatible
+ * compiler, in which -fno-builtins or -ffreestanding might be
+ * asserted, thereby eliminating built-in function optimization, we
+ * may STILL want to leverage built-ins.
+ *
+ * Provide an internal convenience macro to do so.
+ */
+
+/**
+ *  @def __nlIOHasBuiltin
+ *
+ *  @brief
+ *     Determines whether or not the compiler in effect has support
+ *     for the specified built-in function.
+ *
+ */
+#ifdef __clang__
+#define __nlIOHasBuiltin(...) __has_builtin(__VA_ARGS__)
+#elif defined __GNUC__
+#define __nlIOHasBuiltin(...) 1
+#else
+#define __nlIOHasBuiltin(...) 0
+#endif /* __clang__ */
+
+#endif /* NLIO_PRIVATE_H */