From Austerlitz, I learned about this Resnais short obliquely based on Borges, Toute la mémore du monde. This article, about architecture in the Bibliothèque Nationale of France, complements the film and the novel very well. And here is a set of 13 films of works by Borges and Bioy Casares.
How do you see film “à la Alain Resnais”? There is a moment in Hiroshima mon amour where Emmanuelle Riva says “Bien regarder, je crois que ça s’apprend.” The entire film is about vision, and it is about war, so it is related to Austerlitz.