cvs commit: fptools/libraries/Cabal/Distribution Simple.hs

[ross at soi.city.ac.uk]

>   ** used basic preConf from HugsSetup as default preConf

I don't think that's right: I have Setup.description as the static info,
and Setup.buildinfo as extras to add to that (because I don't want to
duplicate the package description).  I would have something like

preConf args (_, _, _, mb_prefix) = do
    let prefix_opt pref opts = ("--prefix=" ++ pref) : opts
    whenM (doesFileExist "configure") $
        rawSystem "./configure" (maybe id prefix_opt mb_prefix args)
    readHook

readHook = do
    pkg_desc <- readPackageDescription defaultPackageDesc
    exists <- doesFileExist buildInfoFile
    if exists then do
        inp <- readFile buildInfoFile
        case parseBuildParameters pkg_descr inp of
            Left err -> die (buildInfoFile ++ ": " ++ showError err)
            Right pkg_descr' -> return (Just pkg_descr')
      else
        return (Just pkg_descr)

I also might want a more complicated preConf to deal with systems that
don't support configure scripts (via hardwired output).

An alternative to putting all that in the library would be to have a
cutdown version of HugsSetup.hs (though it should now work for any
implementation) in Cabal/examples.