On 3 January 2015 at 15:05, Johan Tibell <johan.tibell@gmail.com> wrote:

The error (https://travis-ci.org/haskell/cabal/jobs/45758614) is quite perplexing:

[62 of 77] Compiling Distribution.Client.Config ( Distribution/Client/Config.hs, dist/dist-sandbox-8940a882/build/cabal/cabal-tmp/Distribution/Client/Config.o )

Distribution/Client/Config.hs:56:12:

    Module

    ‘Distribution.Simple.Compiler’

    does not export

    ‘DebugInfoLevel(..)’

cabal: Error: some packages failed to install:

cabal-install-1.22.0.0 failed during the building phase. The exception was:

ExitFailure 1

Distribution.Simple.Compiler most definitely does export DebugInfoLevel, otherwise it wouldn't compile with the other GHC versions.

Does GHC do something special with Cabal nowadays when it's no longer tied to GHC?

Is it because the Cabal-1.22.0.0 bundled with ghc is now different to the Cabal-1.22.0.0 in github? I get the same error compiling the master branch cabal-install with ghc-7.10.0-20141222.

I think one solution is to increase the version number of Cabal in github (for 1.22 and master branches), and to make the latest cabal-install depend on this (i.e. Cabal>=1.22.0.1) since cabal-install 1.22 in github no longer works with the 'released' snapshot Cabal-1.22.0.0 in ghc. This fixes the error for ghc-7.10.0-20141222.