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Today's Topics:
1. Strange type error with hsc2hs and cabal
(PICCA Frederic-Emmanuel)
----------------------------------------------------------------------
Message: 1
Date: Sat, 30 Jan 2016 22:11:31 +0000
From: PICCA Frederic-Emmanuel
<frederic-emmanuel.pi...@synchrotron-soleil.fr>
To: "beginners@haskell.org" <beginners@haskell.org>
Subject: [Haskell-beginners] Strange type error with hsc2hs and cabal
Message-ID:
<a2a20ec3b8560d408356cac2fc148e53b3033...@sun-dag3.synchrotron-soleil.fr>
Content-Type: text/plain; charset="Windows-1252"
Hello, I am still playing with FFI. Now I create a real project with cabal end
build a library and an executable for my project.
---hkl.cabal---
name: hkl
version: 0.1.0.0
executable ghkl
main-is: ghkl.hs
build-depends: base >=4.8 && <4.9
, containers >=0.5 && <0.6
, filepath
, gtk >=0.13 && <0.14
, hkl
hs-source-dirs: src
default-language: Haskell2010
pkgconfig-depends: hkl
build-tools: hsc2hs
library
exposed-modules: Hkl, Hkl.Types, Hkl.C, Hkl.DArray
other-extensions: CPP, ForeignFunctionInterface, EmptyDataDecls,
TypeFamilies, FlexibleInstances, FlexibleContexts, RecordWildCards
build-depends: base >=4.8 && <4.9, containers >=0.5 && <0.6
hs-source-dirs: src
build-tools: hsc2hs
default-language: Haskell2010
pkgconfig-depends: hkl
--- ---
but when I compile my project I get this errormessage which is really strange.
$ cabal build
Package has never been configured. Configuring with default flags. If this
fails, please run configure manually.
Warning: The package list for 'hackage.haskell.org' is 17.1 days old.
Run 'cabal update' to get the latest list of available packages.
Resolving dependencies...
Configuring hkl-0.1.0.0...
Warning: 'data-files: ../../gui/ghkl.ui' is a relative path outside of the
source tree. This will not work when generating a tarball with 'sdist'.
Building hkl-0.1.0.0...
Preprocessing library hkl-0.1.0.0...
[1 of 4] Compiling Hkl.Types ( src/Hkl/Types.hs, dist/build/Hkl/Types.o )
[2 of 4] Compiling Hkl.C ( src/Hkl/C.hs, dist/build/Hkl/C.o )
[3 of 4] Compiling Hkl.DArray ( dist/build/Hkl/DArray.hs,
dist/build/Hkl/DArray.o )
[4 of 4] Compiling Hkl ( src/Hkl.hs, dist/build/Hkl.o )
In-place registering hkl-0.1.0.0...
Preprocessing executable 'ghkl' for hkl-0.1.0.0...
[1 of 4] Compiling Hkl.Types ( src/Hkl/Types.hs,
dist/build/ghkl/ghkl-tmp/Hkl/Types.o )
[2 of 4] Compiling Hkl.C ( src/Hkl/C.hs,
dist/build/ghkl/ghkl-tmp/Hkl/C.o )
[3 of 4] Compiling Hkl ( src/Hkl.hs,
dist/build/ghkl/ghkl-tmp/Hkl.o )
[4 of 4] Compiling Main ( src/ghkl.hs,
dist/build/ghkl/ghkl-tmp/Main.o )
src/ghkl.hs:44:39:
Couldn't match expected type ?Hkl.Types.EngineList?
with actual type ?Hkl.EngineList?
NB: ?Hkl.Types.EngineList?
is defined in ?Hkl.Types? in package ?hkl-0.1.0.0?
?Hkl.EngineList? is defined at src/Hkl/Types.hs:22:1-74
In the first argument of ?Hkl.engineListEnginesGet?, namely
?engines?
In a stmt of a 'do' block: tmp <- Hkl.engineListEnginesGet engines
if I add a other-modules to ghkl an remove the hkl dependecy it work great.
so what is wrong with this project.
PS: the DArray module is indeed the one using hsc2hs :)
Thansk for your help
Frederic
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