Re: [Haskell-cafe] Mystified by Cabal

On Sat, 2009-03-07 at 17:30 +0000, Colin Paul Adams wrote:

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"Svein" == Svein Ove Aas writes:

>> Preprocessing library game-tree-1.0.0.0... Building >> game-tree-1.0.0.0... >> >> Data/Tree/Game/Negascout.hs:31:0: Unrecognised pragma [1 of 2] >> Compiling Data.Tree.Game.Tree ( Data/Tree/Game/Tree.hs, >> dist/build/Data/Tree/Game/Tree.o ) >> >> Data/Tree/Game/Tree.hs:1:0: Failed to load interface for >> `Prelude': it is a member of package base-3.0.3.0, which >> is hidden >> Svein> What does your .cabal file look like?

Don, mkcabal is generating .cabal files that are confusing people. It should generate new-style .cabal files with library or executable sections. The ghc-options and build-depends etc need to be in the lib or exe section. The files it generates are not actually broken but it leaves new users to do the conversion from old style to new and unsurprisingly many get that wrong. Cabal is also at fault here for not providing good diagnostics but it would help if mkcabal used the current recommended style. Note also that the list of licenses mkcabal offers is wrong. You can get the list from the Cabal lib itself so there is no need to maintain the list manually. I still think mkcabal should be integrated into cabal-install, like: $ cabal init or something. We could also more easily keep it up to date that way. Duncan