Preheat oven to 350°. Combine cake mix, oil and 1 egg in a medium bowl; stir until well blended. Press mixture into bottom of greased 9 x 13 inch baking dish. Bake 20 minutes. In a large bowl, beat sugar, remaining 4 eggs and salt until well blended. Beat in corn syrup, melted butter and vanilla. Stir in pecans and coconut. Pour filling over hot crust. Bake 30 to 35 minutes until top is lightly browned, and center is set. Cool in pan or on a wire rack. Cut into squares.