Add comment, silence warning

intern/clog/CLG_log.h

@@ -212,6 +212,7 @@ void CLG_logref_init(CLG_LogRef *clg_ref);
   ((void)CLOG_ENSURE(clg_ref), \
    ((clg_ref)->type->flag & CLG_FLAG_USE) && ((clg_ref)->type->verbosity_level >= verbose_level))
 
+/** log at severity WARNING or higher is always logged, even if not in use */
 #define CLOG_AT_SEVERITY(clg_ref, severity, verbose_level, ...) \
   { \
     CLG_LogType *_lg_ty = CLOG_ENSURE(clg_ref); \

source/blender/makesrna/intern/rna_userdef.c

@@ -1097,12 +1097,14 @@ static void rna_clog_log_verbosity_set(PointerRNA *UNUSED(ptr), int value)
   CLG_verbosity_level_set(value);
 }
 
-static void rna_Userdef_log_filter_update(struct Main *main,
-                                          struct Scene *scene,
-                                          struct PointerRNA *ptr)
+/*
+static void rna_Userdef_log_filter_update(struct Main *UNUSED(main),
+                                          struct Scene *UNUSED(scene),
+                                          struct PointerRNA *UNUSED(ptr))
 {
   printf("Update!\n");
 }
+*/
 
 static void rna_clog_log_filter_get(PointerRNA *ptr, char *value)
 {