SM_DEBUG_UNKNOWN
((debug)->debug_level != SM_DEBUG_UNKNOWN || \
((debug)->debug_level == SM_DEBUG_UNKNOWN \
# define sm_debug_unknown(debug) ((debug)->debug_level == SM_DEBUG_UNKNOWN)
SM_DEBUG_UNKNOWN, \
debug->debug_level = SM_DEBUG_UNKNOWN;
if (debug->debug_level == SM_DEBUG_UNKNOWN)