+ if (Profile->get_trx() && (_flags & Destructive)) {
+ error << string_compose (_("%1: this session uses destructive tracks, which are not supported"), PROGRAM_NAME) << endmsg;
+ return -1;
+ }
+
+ if (version < 3000) {
+ /* a source with an XML node must necessarily already exist,
+ and therefore cannot be removable/writable etc. etc.; 2.X
+ sometimes marks sources as removable which shouldn't be.
+ */
+ if (!(_flags & Destructive)) {
+ _flags = Flag (_flags & ~(Writable|Removable|RemovableIfEmpty|RemoveAtDestroy|CanRename));
+ }
+ }
+