Explicitly specify default sync behavior for no-std

lightning/src/ln/peer_handler.rs

@@ -1730,23 +1730,26 @@ impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, OM: Deref, L: Deref, CM
 			return Err(PeerHandleError { }.into());
 		}
 
-		if let wire::Message::GossipTimestampFilter(msg) = message {
+		if let wire::Message::GossipTimestampFilter(_msg) = message {
 			// When supporting gossip messages, start initial gossip sync only after we receive
 			// a GossipTimestampFilter
 			if peer_lock.their_features.as_ref().unwrap().supports_gossip_queries() &&
 				!peer_lock.sent_gossip_timestamp_filter {
 				peer_lock.sent_gossip_timestamp_filter = true;
 
-				#[allow(unused_mut, unused_assignments)]
-				let mut full_sync_threshold = 0;
+				#[allow(unused_mut)]
+				let mut should_do_full_sync = true;
 				#[cfg(feature = "std")]
 				{
 					// if the timestamp range starts more than six hours ago, do a full sync
-					// otherwise, start at the current time
+					// otherwise, only forward ad-hoc gossip
 					use std::time::{SystemTime, UNIX_EPOCH};
-					full_sync_threshold = SystemTime::now().duration_since(UNIX_EPOCH).expect("Time must be > 1970").as_secs() - 6 * 3600;
+					let full_sync_threshold = SystemTime::now().duration_since(UNIX_EPOCH).expect("Time must be > 1970").as_secs() - 6 * 3600;
+					if (_msg.first_timestamp as u64) > full_sync_threshold {
+						should_do_full_sync = false;
+					}
 				}
-				if (msg.first_timestamp as u64) <= full_sync_threshold {
+				if should_do_full_sync {
 					peer_lock.sync_status = InitSyncTracker::ChannelsSyncing(0);
 				}
 			}