+#if defined(__GNUC__) || defined(__clang__)
+#define PRINTF_FUNCTION(A,B) __attribute__((format(printf,A,B)))
+#define ARG_UNUSED __attribute__((__unused__))
+#else
+#define PRINTF_FUNCTION(A,B)
+#define ARG_UNUSED /**/
+#endif
+
+#ifdef WANT_DEEPER_PRINTF_CHECKS
+#define ALMOST_PRINTF(A, B) PRINTF_FUNCTION(A, B)