cabal sdist trouble with GHC from head

Austin Seipp austin at
Thu Oct 30 20:48:33 UTC 2014

I would imagine they are well aware, what with all the changes that
have gone in the past few weeks (for backpack support, package db
overhauls, etc).

However, I think crux of it (and the real question) isn't are they
aware - but "When will there be a Cabal release that supports GHC
HEAD, which will become 7.10"? This is a question I'm afraid I cannot
answer - Johan does the typical Cabal releases, AFAIK.

I've CC'd Duncan and Johan - do either of you have plans for this?
Considering we hope the stable freeze will happen soon for 7.10, I
imagine Cabal won't be very far behind in this regard, but I'm not
sure if there's a plan set down anywhere as to when the next release
will happen.

On Thu, Oct 30, 2014 at 3:30 PM, Sven Panne <svenpanne at> wrote:
> 2014-10-30 17:20 GMT+01:00 Austin Seipp <austin at>:
>> [...] So this just means that Cabal isn't necessarily *future compatible*
>> with future GHCs - they may change the package format, etc. But it is
>> backwards compatible with existing ones.
> OK, that's good to know. To be sure, I've just tested Cabal head + GHC
> 7.8.3, and it works. But as I've mentioned already, there seems to be
> *no* Cabal version which works with GHC head:
> Is this
> known to the Cabal people?


Austin Seipp, Haskell Consultant
Well-Typed LLP,

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