Which package are you trying to build? Is it a local package that fails to build or something on Hackage? Its .cabal file or at least full dependencies would be of interest. Regards, Alexander Foremny 2012/7/17 Levent Erkok :

Thanks Alexander. However, I'm not sure how to use the workaround described so I can get hackage to properly compile my package. It sounds like I have to add a "template-haskell >= 2.7.0.0" dependency to my own cabal file, which sounds like the wrong thing to do in the long-run.

Is there something that can be done on the hackage/ghc side to avoid this issue? Or something less drastic than adding a template-haskell dependency on my own package's cabal file?

Thanks,

-Levent.

On Tue, Jul 17, 2012 at 7:31 AM, Alexander Foremny wrote:

...

Dear Levent,

I think this [1] could be related.

Regards, Alexander Foremny

PS. Sent this to Levent directly. Here's a copy for the mailing list. Sorry for the noise.

[1] http://haskell.1045720.n5.nabble.com/Bad-interface-problem-td5714184.html

---------- Forwarded message ---------- From: Alexander Foremny Date: 2012/7/17 Subject: Re: [Haskell-cafe] hackage compile failure with QuickCheck 2.5 To: Levent Erkok

Dear Levent,

I think this [1] could be related.

Regards, Alexander Foremny

[1] http://haskell.1045720.n5.nabble.com/Bad-interface-problem-td5714184.html

2012/7/17 Levent Erkok :

...

[This message is more appropriate for a hackage mailing list I presume, but that doesn't seem to exist. Let me know if there's a better place to send it.]

I'm having a hackage compile failure for a newly uplodaded package that has a QuickCheck 2.5 dependence. The error message is:

[13 of 13] Compiling Test.QuickCheck.All ( Test/QuickCheck/All.hs, dist/build/Test/QuickCheck/All.o )

Test/QuickCheck/All.hs:15:1: Bad interface file:

/usr/local/tmp/archive/install/lib/template-haskell-2.6.0.0/ghc-7.4.1/Language/Haskell/TH.hi Something is amiss; requested module template-haskell-2.6.0.0:Language.Haskell.TH differs from name found in the interface file template-haskell:Language.Haskell.TH

The full log file is at (search for "Something is a miss" in it): http://hackage.haskell.org/packages/archive/sbv/2.2/logs/failure/ghc-7.4

Needless to say, I don't see this problem when I compile this package at home with the same compiler (ghc 7.4.1) as hackage is using; also Hackage has a successfully compiled QuickCheck 2.5 package.

Could it be something related to the particular cabal/ghc installation on the hackage server? In particular, I don't understand why it picks template-haskell 2.6.0.0 when there's a newer version (2.7.0.0). As far as I can see, QuickCheck doesn't put an upper limit on its template haskell version dependency.

I'd appreciate any pointers with this. (Googling and questions on the #haskell irc channel didn't help much, unfortunately.)

-Levent.

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Ah, that explains why the hackage page mysteriously got fixed. Thanks for looking into this Ross. It still feels like this'll start biting more folks down the road. I've created the following cabal ticket so it can be tracked: https://github.com/haskell/cabal/issues/978 However, my understanding of the problem is rather incomplete; please feel free to add comments to the ticket. -Levent. On Tue, Jul 17, 2012 at 10:26 AM, Ross Paterson wrote:

With ghc 7.4.1, cabal-install 0.13.3 and Cabal 1.14.0,

% cabal install --avoid-reinstalls sbv-2.2

fails to find a plan without reinstalls, and recommends --solver=modular.

% cabal install --solver=modular --avoid-reinstalls sbv-2.2

reinstalls template-haskell-2.6.0.0, which breaks the GHC installation.

I've added the suggested --constraint='template-haskell==2.7.0.0' option as a workaround, but it seems the --avoid-reinstalls option is being ignored.

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