+#ifdef HAVE_STATIC_ASSERT
+#define STATIC_ASSERT(expr, msg) _Static_assert((expr), msg)
+#else
+#define STATIC_ASSERT(check, msg)
+#endif
+
+#ifdef HAVE_ATTR_PACKED
+#define PACKED(...) __VA_ARGS__ __attribute__((__packed__))
+#else
+#ifdef _MSC_VER
+#define PACKED(...) __pragma(pack(push, 1)) __VA_ARGS__ __pragma(pack(pop))
+#else
+#warning Your compiler does not support __packed__. Use at your own risk.
+#endif
+#endif
+
+#ifdef HAVE_ATTR_MALLOC
+#define ATTR_MALLOC __attribute__((__malloc__))
+#else
+#define ATTR_MALLOC
+#endif
+
+#ifdef HAVE_ATTR_NONNULL
+#define ATTR_NONNULL __attribute__((__nonnull__))
+#else
+#define ATTR_NONNULL
+#endif
+
+#ifdef HAVE_ATTR_WARN_UNUSED_RESULT
+#define ATTR_WARN_UNUSED __attribute__((__warn_unused_result__))
+#else
+#define ATTR_WARN_UNUSED
+#endif
+
+#ifdef HAVE_ATTR_FORMAT
+#define ATTR_FORMAT(func, str, nonstr) __attribute__((format(func, str, nonstr)))
+#else
+#define ATTR_FORMAT(func, str, nonstr)
+#endif
+