New subject: Re[2]: Mystified by Cabal

7 Mar 2009

      I have just attempted Cabal-izing my program (splitting it into a
library and main program as well), and I'm mystified by some problems
I am having.

First, when I try to build the library I get:

[colin@susannah game-tree]$ runhaskell Setup build
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

That mystifies me. Googling, it appears to be a common error in the
past, but none of the reasons apparently apply to my
case. Incidentally, Tree.hs imports nothing. It just looks like:

-- | Nodes in game trees
-- Copyright 2009 Colin Adams
--
-- This file is part of game-tree.
--
--  Game-tree is free software: you can redistribute it and/or modify
--  it under the terms of the GNU General Public License as published by
--  the Free Software Foundation, either version 3 of the License, or
--  (at your option) any later version.

--  Game-tree is distributed in the hope that it will be useful,
--  but WITHOUT ANY WARRANTY; without even the implied warranty of
--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
--  GNU General Public License for more details.

--  You should have received a copy of the GNU General Public License
--  along with game-tree.  If not, see http://www.gnu.org/licenses/.

module Data.Tree.Game.Tree where

-- | Nodes in a game search tree
class Tree a where
    -- | Is this a game-terminating node (e.g. checkmate)?
    is_terminal ::  a -> Bool
    -- | Heuristic value of node
    node_value :: a -> Int
    -- | Child nodes in the game tree (positions more deeply searched)
    children :: a -> [a]

So I couldn't build my program using runhaskell, as I couldn't install
the library. Instead, i tried ghc --make instead with the -idir
option. It looks in the right place, but still doesn't recognise the
module:

Chasing modules from: *Chu-shogi.hs

Generator.hs:27:7:
    Could not find module `Data.Tree.Game.Tree':
      locations searched:
        Data/Tree/Game/Tree.hs
        Data/Tree/Game/Tree.lhs
        dirs=../game-tree/Data/Tree/Game/Tree.hs
        dirs=../game-tree/Data/Tree/Game/Tree.lhs

What am I doing wrong?

Perhaps Cabal should be named Caballa instead.
-- 
Colin Adams
Preston Lancashire

Mystified by Cabal

Colin Paul Adams

Svein Ove Aas

Colin Paul Adams

Bulat Ziganshin

Robin Green

Colin Paul Adams

Duncan Coutts

Svein Ove Aas

Duncan Coutts

John Meacham

Duncan Coutts

Don Stewart

Don Stewart

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