Re: [Caml-list] Conditional BuildDepends in OASIS

[Dario Teixeira <darioteixeira@yahoo.com>]

Hi,


Thanks for the suggestions, Anil!

> However, your use case seems a little different, as I presume the
> external interface of pgocaml doesn't vary by your choice of Extlib
> or Batteries?

Indeed.

> Despite this, it might be easier just to define a "pgocaml.batteries"
> and "pgocaml.extlib" and leave the choice with the user as to which
> one they would like to select.  You can make the dependency optional
> at compile time so the package doesn't generated; e.g.
> 
> Library cohttp_lwt_unix
>   Build$: flag(lwt)
>   Install$: flag(lwt)
>   Path: lwt
>   Findlibname: lwt
>   FindlibParent: cohttp
>   BuildDepends: lwt.unix, uri, cohttp, lwt.ssl, lwt.syntax
>   Modules: Cohttp_lwt_unix, (etc...)

That would be a satisfactory solution.  I did run into a different problem, though.
I told OASIS that "pgocaml.batteries" and "pgocaml.extlib" should have "pgocaml"
as their findlib parent (fragment below).  Unfortunately, OASIS complains that
library "pgocaml" does not exist.  How would I tell OASIS that "pgocaml" is a
dummy library?

Flag "batteries"
  Description: Use Batteries
  Default: true

Library "pgocaml_batteries"
  Build$:               flag(batteries)
  Install$:             flag(batteries)
  Path:                 src
  Modules:              PGOCaml
  BuildDepends:         calendar, batteries
  ByteOpt+:             -ppopt -DUSE_BATTERIES
  NativeOpt+:           -ppopt -DUSE_BATTERIES
  FindlibParent:        pgocaml
  Findlibname:          batteries

Thanks again for your attention!
Cheers,
Dario