HEADS UP: Running cabal install with the latest GHC

Carter Schonwald carter.schonwald at gmail.com
Sat Sep 27 16:40:31 UTC 2014

Currently released cabal-install on hackage doesn't know how to do linkery
for ghc head afaik, but I could be wrong

On Sat, Sep 27, 2014 at 12:26 PM, Reid Barton <rwbarton at gmail.com> wrote:

> On Fri, Aug 8, 2014 at 8:00 AM, Edward Z. Yang <ezyang at mit.edu> wrote:
>> Hey all,
>> SPJ pointed out to me today that if you try to run:
>>     cabal install --with-ghc=/path/to/inplace/bin/ghc-stage2
>> with the latest GHC HEAD, this probably will not actually work, because
>> your system installed version of Cabal is probably too old to deal with
>> the new package key stuff in HEAD.  So, how do you get a version
>> of cabal-install (and Cabal) which is new enough to do what you need
>> it to?
>> The trick is to compile Cabal using your /old/ GHC. Step-by-step, this
>> involves cd'ing into libraries/Cabal/Cabal and running `cabal install`
>> (or install it in a sandbox, if you like) and then cd'ing to
>> libraries/Cabal/cabal-install and cabal install'ing that.
> Hi all,
> The new cabal-install I built last month following the instructions above
> started failing with recent GHC HEAD with messages like
>  ghc: 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.
> I found that repeating these steps with the latest libraries/Cabal
> submodule gave me a cabal-install that, so far, appears to be working with
> GHC HEAD. So if your cabal-install has stopped working with HEAD, try
> building the latest version as outlined in Edward's email.
> Cabal wizards, any gotchas with current Cabal & GHC HEAD I should be aware
> of?
> Regards,
> Reid Barton
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