Subject: Problem configuring c2hs with Cabal-1.2

[Judah Jacobson]

I just downloaded c2hs (HEAD version) and tried to run "runhaskell
Setup.hs configure" using the ghc 6.8 release candidate (i.e., Cabal
1.2), and got the following error:

> Configuring c2hs-0.15.0...
> Setup.hs: Error: Non-empty library, but empty exposed modules list. Cabal may not build this library correctly

The .cabal file is parseable by ghc-6.6.1 (with Cabal 1.1.6.2).  It's
unclear to me whether this counts as a c2hs bug or a Cabal bug (maybe
the above message should only be a warning?), so I'm cc'ing both
lists.

Also note that regardless, c2hs will need to be updated to work with
base-2.0; when I tried ghc-6.8 with Cabal-1.1.6, I got the following
error:

> base/state/CIO.hs:71:7:
>     Could not find module `System.Cmd':
>       it is a member of package process-1.0, which is hidden

Best,
-Judah
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[Duncan Coutts]

On Thu, 2007-09-13 at 15:17 -0700, Judah Jacobson wrote:

> I just downloaded c2hs (HEAD version) and tried to run "runhaskell
> Setup.hs configure" using the ghc 6.8 release candidate (i.e., Cabal
> 1.2), and got the following error:
>
> > Configuring c2hs-0.15.0...
> > Setup.hs: Error: Non-empty library, but empty exposed modules list. Cabal may not build this library correctly
>
> The .cabal file is parseable by ghc-6.6.1 (with Cabal 1.1.6.2).  It's
> unclear to me whether this counts as a c2hs bug or a Cabal bug (maybe
> the above message should only be a warning?), so I'm cc'ing both
> lists.

We debated for a while whether this was a cabal or c2hs bug. In the end
we decided that Cabal was right, though in current Cabal versions the
error message explaining why it's wrong has been improved.

> Also note that regardless, c2hs will need to be updated to work with
> base-2.0

Yes, I'll do an updated release that's compatible with 6.8 and also
addresses some other packaging complaints.

Duncan
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