/* Asserts are enabled if NDEBUG isn't defined or WITH_ASSERT is defined. */
#if !defined(NDEBUG) || defined(WITH_ASSERT)
#define OTTD_ASSERT
#define assert_msg(expression, msg, ...) if (unlikely(!(expression))) error("Assertion failed at line %i of %s: %s\n\t" msg, __LINE__, __FILE__, #expression, __VA_ARGS__);