cabal has changed for HEAD, you need to install 1.21.1.0 On Thu, Oct 23, 2014 at 2:40 PM, Sven Panne wrote:

2014-10-22 15:16 GMT+02:00 Sven Panne :

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Does anybody have a clue what's going wrong at the sdist step here?

https://travis-ci.org/haskell-opengl/OpenGLRaw/jobs/38707011#L104

This only happens with a GHC from head, a build with GHC 7.8.3 is fine:

https://travis-ci.org/haskell-opengl/OpenGLRaw/jobs/38707010

Any help highly appreciated...

I would really need some help here, even adding a few more diagnostic things to the Travis CI configuration didn't give me a clue what's going wrong:

https://travis-ci.org/haskell-opengl/OpenGLRaw/jobs/38813449#L110

I totally fail to understand why Cabal's sdist step works with every released compiler, but not with a GHC from head. I don't even know if this is a Cabal issue or a GHC issue. The relevant part from the Travis CI log is:

... cabal-1.18 sdist --verbose=3 creating dist/src creating dist/src/sdist.-3586/OpenGLRaw-1.5.0.0 Using internal setup method with build-type Simple and args:

["sdist","--verbose=3","--builddir=dist","--output-directory=dist/src/sdist.-3586/OpenGLRaw-1.5.0.0"] cabal-1.18: dist/setup-config: invalid argument The command "cabal-1.18 sdist --verbose=3" exited with 1. ...

As can be seen from the log, dist/setup-config is there and can be accessed.

Confused, S. _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs

On Thu, Oct 23, 2014 at 8:47 AM, Sven Panne wrote:

2014-10-23 15:01 GMT+02:00 Alan & Kim Zimmerman :

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cabal has changed for HEAD, you need to install 1.21.1.0

Hmmm, so we *force* people to update? o_O Perhaps I've missed an announcement, and I really have a hard time deducing this from the output on Travis CI. Is 1.21.1.0 backwards-compatible to previous GHCs? Or do I have to set up something more or less complicated depending on the GHC version (which would be unfortunate)? _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs

Just to be clear, Cabal will always support every major GHC version going back several years. I think it even supports GHC 6.12 still and Duncan tests with it. But, sometimes a GHC change may require you to use a newer version of Cabal, for things to work. 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. -- Regards, Austin Seipp, Haskell Consultant Well-Typed LLP, http://www.well-typed.com/

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 wrote:

2014-10-30 17:20 GMT+01:00 Austin Seipp :

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[...] 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: https://travis-ci.org/haskell-opengl/StateVar/builds/39533448 Is this known to the Cabal people?

-- Regards, Austin Seipp, Haskell Consultant Well-Typed LLP, http://www.well-typed.com/