+#if defined __GNUC__
+# if (__GNUC__ < 4) || \
+ defined(__GNUC_MINOR__) && (__GNUC__ == 4) && (__GNUC_MINOR__ < 4)
+ /* gcc versions before 4.4.x don't support gnu_printf, so use printf. */
+# define GCC_ATTR __attribute__((__unused__, format(printf, 1, 2)))
+# define GCC_FMT_ATTR(n, m) __attribute__((format(printf, n, m)))
+# else
+ /* Use gnu_printf when supported (qemu uses standard format strings). */
+# define GCC_ATTR __attribute__((__unused__, format(gnu_printf, 1, 2)))
+# define GCC_FMT_ATTR(n, m) __attribute__((format(gnu_printf, n, m)))
+# endif
+#else
+#define GCC_ATTR /**/
+#define GCC_FMT_ATTR(n, m)
+#endif
+