Dump infrastructure totals when mismatch detected in CheckCaches.

src/company_base.h

@@ -45,6 +45,7 @@ struct CompanyInfrastructure {
 
 	uint32 GetRoadTotal() const;
 	uint32 GetTramTotal() const;
+	char *Dump(char *buffer, const char *last) const;
 };
 
 typedef Pool<Company, CompanyID, 1, MAX_COMPANIES> CompanyPool;

src/company_cmd.cpp

@@ -1182,3 +1182,18 @@ uint32 CompanyInfrastructure::GetTramTotal() const
 	}
 	return total;
 }
+
+char *CompanyInfrastructure::Dump(char *buffer, const char *last) const
+{
+	for (RailType rt = RAILTYPE_BEGIN; rt != RAILTYPE_END; rt++) {
+		if (rail[rt]) buffer += seprintf(buffer, last, "Rail: %s: %u\n", GetStringPtr(GetRailTypeInfo(rt)->strings.name), rail[rt]);
+	}
+	buffer += seprintf(buffer, last, "Signal: %u\n", signal);
+	buffer += seprintf(buffer, last, "Road: %u\n", road[ROADTYPE_ROAD]);
+	buffer += seprintf(buffer, last, "Tram: %u\n", road[ROADTYPE_TRAM]);
+	buffer += seprintf(buffer, last, "Water: %u\n", water);
+	buffer += seprintf(buffer, last, "Station: %u\n", station);
+	buffer += seprintf(buffer, last, "Airport: %u\n", airport);
+
+	return buffer;
+}

src/openttd.cpp

@@ -1175,6 +1175,11 @@ void CheckCaches(bool force_check)
 	for (const Company *c : Company::Iterate()) {
 		if (MemCmpT(old_infrastructure.data() + i, &c->infrastructure) != 0) {
 			DEBUG(desync, 0, "infrastructure cache mismatch: company %i", (int)c->index);
+			char buffer[4096];
+			old_infrastructure.Get(i)->Dump(buffer, lastof(buffer));
+			DEBUG(desync, 0, "Previous:\n%s", buffer);
+			c->infrastructure.Dump(buffer, lastof(buffer));
+			DEBUG(desync, 0, "Recalculated:\n%s", buffer);
 		}
 		i++;
 	}