On Wed, 2014-11-05 at 09:50 +0000, Simon Peyton Jones wrote:
| Actually I'd suggest you use the Cabal and cabal-install that are part | of the ghc source tree, rather than Cabal/cabal-install HEAD. The two | are not always the same.
Aha ok, thank you. How exactly do I do that? Where is the executable cabal-install in the tree? IN inplace/bin I see an executable ghc-cabal. Is that it?
Alternatively, "Plan B" on https://ghc.haskell.org/trac/ghc/wiki/Debugging/InstallingPackagesInplace (which I confess I'd forgotten about) describes a different plan that doesn't mention cabal-install at all. Is that better?
To follow up on a rather old thread: I included a little backwards compatibility hack (which I think made it into RC2) so that other users will not hit this, so that they can continue to use an old version of cabal-install with 7.10. For context, the error you and others were seeing was:
ghc-stage2: ghc no longer supports single-file style package databases (dist/package.conf.inplace) use 'ghc-pkg init' to create the database with the correct format.
-- Duncan Coutts, Haskell Consultant Well-Typed LLP, http://www.well-typed.com/