+#ifdef HAVE___ATTRIBUTE__
+/* Prevent/force inlining. Used to improve performance. */
+# define noinline __attribute__((noinline))
+# define always_inline __attribute__((always_inline))
+/* Unused parameter. */
+# define unused __attribute__((unused))
+#else
+# define noinline
+# define always_inline
+# define unused
+#endif
+