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+/*
+             LUFA Library
+     Copyright (C) Dean Camera, 2017.
+
+  dean [at] fourwalledcubicle [dot] com
+           www.lufa-lib.org
+*/
+
+/*
+  Copyright 2017  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+  Permission to use, copy, modify, distribute, and sell this
+  software and its documentation for any purpose is hereby granted
+  without fee, provided that the above copyright notice appear in
+  all copies and that both that the copyright notice and this
+  permission notice and warranty disclaimer appear in supporting
+  documentation, and that the name of the author not be used in
+  advertising or publicity pertaining to distribution of the
+  software without specific, written prior permission.
+
+  The author disclaims all warranties with regard to this
+  software, including all implied warranties of merchantability
+  and fitness.  In no event shall the author be liable for any
+  special, indirect or consequential damages or any damages
+  whatsoever resulting from loss of use, data or profits, whether
+  in an action of contract, negligence or other tortious action,
+  arising out of or in connection with the use or performance of
+  this software.
+*/
+
+/** \file
+ *  \brief Special function/variable attribute macros.
+ *
+ *  \copydetails Group_FuncVarAttributes
+ *
+ *  \note Do not include this file directly, rather include the Common.h header file instead to gain this file's
+ *        functionality.
+ */
+
+/** \ingroup Group_Common
+ *  \defgroup Group_FuncVarAttributes Function/Variable Attributes
+ *  \brief Special function/variable attribute macros.
+ *
+ *  This module contains macros for applying specific attributes to functions and variables to control various
+ *  optimizer and code generation features of the compiler. Attributes may be placed in the function prototype
+ *  or variable declaration in any order, and multiple attributes can be specified for a single item via a space
+ *  separated list.
+ *
+ *  On incompatible versions of GCC or on other compilers, these macros evaluate to nothing unless they are
+ *  critical to the code's function and thus must throw a compile error when used.
+ *
+ *  @{
+ */
+
+#ifndef __LUFA_ATTR_H__
+#define __LUFA_ATTR_H__
+
+	/* Preprocessor Checks: */
+		#if !defined(__INCLUDE_FROM_COMMON_H)
+			#error Do not include this file directly. Include LUFA/Common/Common.h instead to gain this functionality.
+		#endif
+
+	/* Public Interface - May be used in end-application: */
+		/* Macros: */
+			#if (__GNUC__ >= 3) || defined(__DOXYGEN__)
+				/** Indicates to the compiler that the function can not ever return, so that any stack restoring or
+				 *  return code may be omitted by the compiler in the resulting binary.
+				 */
+				#define ATTR_NO_RETURN               __attribute__ ((noreturn))
+
+				/** Indicates that the function returns a value which should not be ignored by the user code. When
+				 *  applied, any ignored return value from calling the function will produce a compiler warning.
+				 */
+				#define ATTR_WARN_UNUSED_RESULT      __attribute__ ((warn_unused_result))
+
+				/** Indicates that the specified parameters of the function are pointers which should never be \c NULL.
+				 *  When applied as a 1-based comma separated list the compiler will emit a warning if the specified
+				 *  parameters are known at compiler time to be \c NULL at the point of calling the function.
+				 */
+				#define ATTR_NON_NULL_PTR_ARG(...)   __attribute__ ((nonnull (__VA_ARGS__)))
+
+				/** Removes any preamble or postamble from the function. When used, the function will not have any
+				 *  register or stack saving code. This should be used with caution, and when used the programmer
+				 *  is responsible for maintaining stack and register integrity.
+				 */
+				#define ATTR_NAKED                   __attribute__ ((naked))
+
+				/** Prevents the compiler from considering a specified function for in-lining. When applied, the given
+				 *  function will not be in-lined under any circumstances.
+				 */
+				#define ATTR_NO_INLINE               __attribute__ ((noinline))
+
+				/** Forces the compiler to inline the specified function. When applied, the given function will be
+				 *  in-lined under all circumstances.
+				 */
+				#define ATTR_ALWAYS_INLINE           __attribute__ ((always_inline))
+
+				/** Indicates that the specified function is pure, in that it has no side-effects other than global
+				 *  or parameter variable access.
+				 */
+				#define ATTR_PURE                    __attribute__ ((pure))
+
+				/** Indicates that the specified function is constant, in that it has no side effects other than
+				 *  parameter access.
+				 */
+				#define ATTR_CONST                   __attribute__ ((const))
+
+				/** Marks a given function as deprecated, which produces a warning if the function is called. */
+				#define ATTR_DEPRECATED              __attribute__ ((deprecated))
+
+				/** Marks a function as a weak reference, which can be overridden by other functions with an
+				 *  identical name (in which case the weak reference is discarded at link time).
+				 */
+				#define ATTR_WEAK                    __attribute__ ((weak))
+			#endif
+
+			/** Forces the compiler to not automatically zero the given global variable on startup, so that the
+			 *  current RAM contents is retained. Under most conditions this value will be random due to the
+			 *  behavior of volatile memory once power is removed, but may be used in some specific circumstances,
+			 *  like the passing of values back after a system watchdog reset.
+			 */
+			#define ATTR_NO_INIT                     __attribute__ ((section (".noinit")))
+
+			/** Places the function in one of the initialization sections, which execute before the main function
+			 *  of the application. Refer to the avr-libc manual for more information on the initialization sections.
+			 *
+			 *  \param[in] SectionIndex  Initialization section number where the function should be placed.
+			 */
+			#define ATTR_INIT_SECTION(SectionIndex)  __attribute__ ((used, naked, section (".init" #SectionIndex )))
+
+			/** Marks a function as an alias for another function.
+			 *
+			 *  \param[in] Func  Name of the function which the given function name should alias.
+			 */
+			#define ATTR_ALIAS(Func)                 __attribute__ ((alias( #Func )))
+
+			/** Marks a variable or struct element for packing into the smallest space available, omitting any
+			 *  alignment bytes usually added between fields to optimize field accesses.
+			 */
+			#define ATTR_PACKED                      __attribute__ ((packed))
+
+			/** Indicates the minimum alignment in bytes for a variable or struct element.
+			 *
+			 *  \param[in] Bytes  Minimum number of bytes the item should be aligned to.
+			 */
+			#define ATTR_ALIGNED(Bytes)              __attribute__ ((aligned(Bytes)))
+#endif
+
+/** @} */
+