Preheat oven to 375 degrees F. Grease a 15x10 inch jelly role pan and line with wax paper. Sprinkle a cotton, thin kitchen towel with confectioner's sugar and set aside. In a small bowl, combine salt, baking soda, baking powder, cloves, cinnamon, sugar and flour. In a large bowl, beat eggs and sugar until thick. Beat in the pumpkin, and then stir in the flour mixture. Spread batter evenly on jelly roll pan. Bake
for 13-15 minutes or until cakes springs back up when touched. Loosen the cake and invert onto the prepared towel. Carefully remove wax paper. Roll up cake and towel together, starting with the narrow end. Set aside to cool, on a wire rack. Prepare filling by beating the confectioner's sugar, cream cheese, vanilla and butter in a small bowl until smooth. Unroll the cake, and remove the towel. Spread the cream cheese mixture over the cake. Reroll the cake. Wrap in plastic wrap and chill in the refrigerator for at least one hour. Sprinkle with confectioner's sugar before serving.