Maxim Kulkin <maxim.kulkin@gmail.com> writes:

> ghc package depends on exact version of Cabal pacakge. I understand why old
> package depends on some other old package. I just don't understand why GHC
> depends on Cabal.
>

I believe GHC uses a few types from Cabal. Namely InstalledPackageInfo
and a few related types,

    $ git grep 'import Distribution' compiler
    compiler/ghci/Linker.lhs:import Distribution.Package hiding (depends, PackageId)
    compiler/main/Finder.lhs:import Distribution.Text
    compiler/main/Finder.lhs:import Distribution.Package hiding (PackageId)
    compiler/main/PackageConfig.hs:import Distribution.InstalledPackageInfo
    compiler/main/PackageConfig.hs:import Distribution.ModuleName
    compiler/main/PackageConfig.hs:import Distribution.Package hiding (PackageId)
    compiler/main/PackageConfig.hs:import Distribution.Text
    compiler/main/PackageConfig.hs:import Distribution.Version
    compiler/main/Packages.lhs:import Distribution.InstalledPackageInfo
    compiler/main/Packages.lhs:import Distribution.InstalledPackageInfo.Binary
    compiler/main/Packages.lhs:import Distribution.Package hiding (PackageId,depends)

At one point I believe there was a proposal to move these to a separate
package but I don't have a reference on hand.

Cheers,

- Ben


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