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http://www.haskell.org/cabal/
 
http://www.haskell.org/cabal/
==Hints, tips and other suggestions ==
 
*[[Cabal/How to install a Cabal package | Installation tips]]
 
== Building Dlls on Windows with Cabal ==
 
Cabal does not currently support building dlls on windows out of the box. Some details about why can be found here:
 
http://www.haskell.org/ghc/docs/6.4.2/html/users_guide/packages.html
 
http://www.haskell.org/ghc/docs/6.4.2/html/users_guide/win32-dlls.html
 
   
This means that we have to do a bit of hackery to get Cabal to build a dll from a library. As long as we build a single DLL from the entire project the dll should behave as expected. Using the Setup.lhs listed below and following the directions listed above (the second link) I was able to use Visual Haskell to build a dll which I could load into Visual Basic for testing.
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== Summary ==
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* Cabal is a package and build system. Cabal is only involved in the creation of packages and the building of their contents. It does not manage packages.
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* Cabal-Install installs cabal packages. It is distinct from Cabal (the build system). This often confuses new users. Furthermore, Cabal-Install is not a fully featured package manager. For example, it cannot install non cabal packaged dependencies, it cannot uninstall packages, nor can it automatically upgrade installations.
   
The following Setup.lhs should do the trick for most projects which consist of a single library which needs to be built as a dll. If you need to specify a dll export file you'll need to modify the function <tt>cmd</tt> to take this into account. Another possible addition is specifying a static dll. Check the ghc manual above.
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== Information for package users ==
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*[[Cabal/How to install a Cabal package | How to install a Cabal package]]
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*[[Cabal/FAQ|FAQ: Frequently Asked Questions]]
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*[[Cabal-Install]] - tool that greatly simplifies installation of Cabal packages
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*[http://hackage.haskell.org/package/cabal-sort Cabal-Sort] - assistance with compilation of multiple cabal packages
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*[[CabalFind]] - finding Cabal packages on the web (now superseded by [http://hackage.haskell.org/ Hackage])
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* [http://www.vex.net/~trebla/haskell/sicp.xhtml Storage and Identification of Cabalized Packages]
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* [http://hackage.haskell.org/package/cabal-dev cabal-dev], a tool for managing development builds of Haskell projects. It supports maintaining sandboxed cabal-install repositories, and sandboxed ghc package databases. See [http://www.reddit.com/r/haskell/comments/f3ykj/psa_use_cabaldev_to_solve_dependency_problems/ PSA: Use cabal-dev to solve dependency problems] for an extensive description.
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* Blog article: [http://ivanmiljenovic.wordpress.com/2010/03/15/repeat-after-me-cabal-is-not-a-package-manager/ Repeat after me: “Cabal is not a Package Manager”]
   
<haskell>
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== Information for package developers ==
#! /usr/bin/runghc
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*[[How to write a Haskell program]]
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*[[Cabal/Developer-FAQ|FAQ: Frequently Asked Questions of package authors]]
> import Distribution.Simple
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*[[Upgrading packages]]
> import Distribution.Simple.LocalBuildInfo
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*[[Package versioning policy]]
> import Distribution.PackageDescription
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*[[Creating Debian packages from Cabal package]]
> import System.Cmd
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*[http://neilmitchell.blogspot.com/2008/02/adding-data-files-using-cabal.html Adding data files using Cabal]
> import System.Directory
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*[http://www.moonloop.net/haskell/docs/cbs-custom.html Cabal Setup file examples]
> import Data.List
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*[[Cabal-make]] - automation based on makefiles
>
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*[http://blog.ezyang.com/2010/06/setting-up-cabal-the-ffi-and-c2hs/ Setting up Cabal, the FFI and c2hs]
>
 
> main = defaultMainWithHooks (defaultUserHooks { postBuild = buildDll })
 
> where
 
> buildDll _ _ pkg info = do putStrLn "Building Dll..."
 
> setCurrentDirectory (buildDir info)
 
> let buildCmd = cmd pkg info
 
> putStrLn buildCmd
 
> system buildCmd
 
> let dll = dllFile pkg
 
> let cpDllCmd = "cp " ++ dll ++ " " ++ (name pkg) ++ "\\" ++ dll
 
> putStrLn cpDllCmd
 
> system cpDllCmd
 
> ghcExe :: LocalBuildInfo -> String
 
> ghcExe info = "\"" ++ (compilerPath (compiler info)) ++ "\""
 
> mainOFile :: PackageDescription -> String
 
> mainOFile pd = "HS" ++ (name pd) ++ "-" ++ (showVersion (pkgVersion (package pd))) ++ ".o"
 
> cmd :: PackageDescription -> LocalBuildInfo -> String
 
> cmd pd i = (ghcExe i) ++ " --mk-dll -o " ++ (dllFile pd) ++ " " ++ (mainOFile pd) ++ " " ++ (packages i)
 
> packages :: LocalBuildInfo -> String
 
> packages i = foldl1 (\x y -> x ++ " " ++ y) (map showPackage (packageDeps i))
 
> showPackage :: PackageIdentifier -> String
 
> showPackage pi = "-package " ++ showPackageId pi
 
> name :: PackageDescription -> String
 
> name = pkgName . package
 
> dllFile :: PackageDescription -> String
 
> dllFile pd = (name pd) ++ ".dll"
 
</haskell>
 
   
 
[[Category:Tools]]
 
[[Category:Tools]]

Revision as of 01:28, 25 August 2011

The Haskell Cabal:

The Common Architecture for Building Applications and Libraries

http://www.haskell.org/cabal/

1 Summary

  • Cabal is a package and build system. Cabal is only involved in the creation of packages and the building of their contents. It does not manage packages.
  • Cabal-Install installs cabal packages. It is distinct from Cabal (the build system). This often confuses new users. Furthermore, Cabal-Install is not a fully featured package manager. For example, it cannot install non cabal packaged dependencies, it cannot uninstall packages, nor can it automatically upgrade installations.

2 Information for package users

3 Information for package developers