Difference between revisions of "Cabal"

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(Link to installation page)
(Remove the most egregiously outdated links (several less outdated links remain))
 
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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 ==
   
<haskell>
 
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*[https://cabal.readthedocs.io/en/latest/index.html Cabal User Guide]
#! /usr/bin/runghc
 
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*[http://dev.stephendiehl.com/hask/#cabal An introduction to cabal-install]
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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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*[http://hackage.haskell.org/ Hackage] - the Haskell community's public repository of cabal packages
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* Other [https://hackage.haskell.org/packages/search?terms=cabal cabal related packages on hackage]
   
> import Distribution.Simple
 
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== Information for package developers ==
> import Distribution.Simple.LocalBuildInfo
 
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*[[How to write a Haskell program]]
> import Distribution.PackageDescription
 
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*[https://wewantarock.wordpress.com/2010/11/03/building-a-shared-library-in-cabal/ Building a shared library in Cabal]
> import System.Cmd
 
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*[[Upgrading packages]]
> import System.Directory
 
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*[[Package versioning policy]]
> import Data.List
 
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*[http://neilmitchell.blogspot.com/2008/02/adding-data-files-using-cabal.html Adding data files using Cabal]
>
 
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*[https://web.archive.org/web/20161108012154/www.moonloop.net/haskell/docs/cbs-custom.html Cabal Setup file examples]
>
 
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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]]
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[[Category:Cabal]]

Latest revision as of 12:34, 2 October 2020

The Haskell Cabal:

The Common Architecture for Building Applications and Libraries

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

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.

Information for package users

Information for package developers