Fix some warnings

pmtiles/pmtiles.hpp

@@ -166,7 +166,7 @@ struct entryv3 {
 	}
 };
 
-struct {
+static struct {
 	bool operator()(entryv3 a, entryv3 b) const {
 		return a.tile_id < b.tile_id;
 	}
@@ -388,7 +388,7 @@ inline uint64_t zxy_to_tileid(uint8_t z, uint32_t x, uint32_t y) {
 	if (z > 31) {
 		throw std::overflow_error("tile zoom exceeds 64-bit limit");
 	}
-	if (x > (1 << z) - 1 || y > (1 << z) - 1) {
+	if (x > (1U << z) - 1 || y > (1U << z) - 1) {
 		throw std::overflow_error("tile x/y outside zoom level bounds");
 	}
 	uint64_t acc = 0;

tile-join.cpp

@@ -688,8 +688,8 @@ struct tileset_reader {
 			perror("pthread_mutex_lock");
 		}
 
-		std::function<mvt_tile(zxy)> getter = [&](zxy tile) {
-			return get_tile(tile);
+		std::function<mvt_tile(zxy)> getter = [&](zxy tileno) {
+			return get_tile(tileno);
 		};
 
 		mvt_tile source = cache.get(parent_tile, getter);