Support addDependentDirectory #11089
Description
https://gitlab.haskell.org/ghc/ghc/-/merge_requests/14473 is adding a new addDependentDirectory method to TemplateHaskell. This is analagous to the addDependentFile method that TemplateHaskell already has.
The recompilation support for that is tracked here: #4746
In short, GHC currently doesn't expose an appropriate interface to tell cabal-install about which files are tracked by TH. There is a workaround though. If we add the files to extra-source-files, then cabal-install will recompile when they change.
I have done some testing and the same workaround will not work for addDependentDirectory. It seems that even if I specify wildcards in extra-source-files, cabal-install will not recompile if new files are matched by the wildcard or old matches are removed.
I am proposing that if extra-source-files includes a wildcard, then we should recompile if the set of matches changes.