#306: can't figure out how to use data-files ----------------------------+----------------------------------------------- Reporter: claus | Owner: Type: defect | Status: closed Priority: normal | Milestone: Component: Cabal library | Version: HEAD Severity: normal | Resolution: duplicate Keywords: | Difficulty: normal Ghcversion: 6.9 | Platform: ----------------------------+----------------------------------------------- Comment (by duncan): Replying to [comment:3 claus]:
Thanks, that works! But since `Paths_p` was generated behind my back, it seems odd that I have to list it myself, especially since a non-empty `data-files` field makes no sense at all without it (no dependency chasing needed for this one).
Well yes and no. There has always been the requirement that packages list all the modules they use. Packages can want to use the Paths module even if there are no data files and people sometimes install data files without needing to find them at runtime in the standard way. In any case this will all go away once we have dependency chasing. There will be no need to specify `other-modules` at all.
I'd suggest to (a) mention this in the user guide
Yes, it's not explicitly documented that every module must be listed either in exposed-modules or other-modules. So we should add that and at the same place point out that this includes modules generated by Cabal if the package chooses to use them.
and (b) add `Paths_package` implicitly if the cabal file has `data- files` (not much sense giving an error message if the fix is uniquely determined).
I don't think this is necessary or necessarily a good idea.
Btw, having `--prefix` not apply to all dirs is very counter-intuitive.
In most circumstances all the dirs are relative to $prefix however for the specific case of data files of packages containing a library and only on Windows, the default is not relative to the prefix. I can't remember exactly why it's this way but I think it's to do with relocatable packages and being able to find the data files for libs. Libraries with data files cannot be relocatable since we cannot then find the files at runtime. -- Ticket URL: http://hackage.haskell.org/trac/hackage/ticket/306#comment:4 Hackage http://haskell.org/cabal/ Hackage: Cabal and related projects