Re: [Haskell-cafe] A new cabal odissey: cabal-1.8 breaking its own neck by updating its dependencies

On Sat, Sep 11, 2010 at 22:29, Paolo Giarrusso wrote:

On Sat, Sep 11, 2010 at 21:43, Daniel Fischer wrote:

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I had a broken dependency which I could see with "grep" but not otherwise.

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ghc-pkg check?

I tried that, but it didn't notice any breakage.

As far as I understand, a package won't depend on packages which were hidden during its build, and all available packages will be recorded as dependencies in the ghc-pkg DB. Yet, for some reason this did not work. Sorry for my phrasing - I was explaining my understanding of how dependencies are discovered, but it was unclear.

I wanted to add is that I discovered this with an error similar to: <command line>: unknown package old-locale-1.0.0.2 where the mentioned module had just been unregistered. BTW, there's no obvious way to re-register a module because the file to pass to ghc-pkg register is not saved on disk. To debug it, I used cabal install -v, then I had to manually invoke ghc -v (because cabal install didn't pass -v to ghc), then finally used grep because the command line did not mention the offending module. -- Paolo Giarrusso - Ph.D. Student http://www.informatik.uni-marburg.de/~pgiarrusso/