Preheat oven to 350°F (175°C).

In a large bowl, combine flour, sugar, eggs, soda, vanilla, and salt.

Add crushed pineapple (juice and all) and melted butter.

Beat with a mixer until creamy.

Pour batter into a greased and floured cake pan.

Bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean.

Let cake cool slightly.

While the cake is still warm, prepare the frosting.

For the frosting, beat powdered sugar and cream cheese with vanilla until smooth.

Pour frosting on cake as soon as it comes out of the oven.

Cool in the refrigerator for 5 minutes to set the frosting before serving.