+/*
+ * _bt_is_signed_type() willingly generates comparison of unsigned
+ * expression < 0, which is always false. Silence compiler warnings.
+ * GCC versions lower than 4.6.0 do not accept diagnostic pragma inside
+ * functions.
+ */
+#if defined(__GNUC__) && (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >= 40600
+# define _BT_DIAG_PUSH _Pragma("GCC diagnostic push")
+# define _BT_DIAG_POP _Pragma("GCC diagnostic pop")
+
+# define _BT_DIAG_STRINGIFY_1(x) #x
+# define _BT_DIAG_STRINGIFY(x) _BT_DIAG_STRINGIFY_1(x)
+
+# define _BT_DIAG_IGNORE(option) \
+ _Pragma(_BT_DIAG_STRINGIFY(GCC diagnostic ignored option))
+# define _BT_DIAG_IGNORE_TYPE_LIMITS _BT_DIAG_IGNORE("-Wtype-limits")
+#else
+# define _BT_DIAG_PUSH
+# define _BT_DIAG_POP
+# define _BT_DIAG_IGNORE
+# define _BT_DIAG_IGNORE_TYPE_LIMITS
+#endif
+