Hello,
I downloaded the finland.osm.pbf extract from geofabrik, run splitter and used mkgmap with the patch. As you described the patch did nothing. I reconverted the tile containing the relation 155054 to osm XML using osmconvert. In the resulting file no relation contained a member with type="relation". Only members with type="node" or type="way" are contained.
So there are three possible problems: 1. The geofabrik dump does not contain subrelations 2. Splitter does not support subrelations 3. Osmconvert does not support subrelations
My current favourite is that splitter is the problem. Maybe someone who knows splitter better than me can have a look at it? Thanks!
It's 2.) Splitter. Relations that only contain relations are dropped. I thought this was known and someone will work on it in the future.
You can test all three cases by filtering out the critical relations with osmfilter
With best regards
Hasemann
Thanks for the analysis. The fix in splitter seems to be very easy. Attached patch does the magic. WanMil