You may want to separate the lists.
Some stage musicals have been based on movie musicals using the film score and often supplemented with additional songs. Right now you've got the Disney trio for example. 42nd Street is about the best of these.
Other films that are called musicals are actually films with music. The film score is not sung by the characters, but is used in the movie as commentary and on stage become book songs. Saturday Night Fever for example, although the show was dreadful.
Some have been based on non-musical films that were originals such as The Apartment (adapted into Promises, Promises), Billy Elliot and Hairspray. If there were songs in the films, all or nearly all were discarded.
Other film-to-stage shows were books or plays before they became non-musical films. Legally Blonde falls into this category. So do many shows.
So Long, 174th Street has a long ancestry: book by Carl Reiner, hit stage play by Joe Stein, flop film adaptation of the play (all 3 called Enter Laughing), then came the fast flop 174th Street musical, only to be revived this season with the title Enter Laughing the Musical and its a hit.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher