Re: incorrect dependencies on template-haskell

On 4 October 2011 05:47, Brandon Moore wrote:

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From: Antoine Latter

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Sent: Sunday, October 2, 2011 9:21 PM

On Sun, Oct 2, 2011 at 8:31 PM, Brandon Moore wrote: ...

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 If the package isn't meant to be upgraded, should it be on  hackage at all?

Using an install of the template-haskell library other than the one GHC was built against will make GHC unhappy - the operations in the library won't type-check against the built-in GHC magic.

I see two possible reasons for having it (along with other boot libraries) still on Hackage: 1) An archive of previous versions 2) In case some other compiler one day supports TH.

If so, the package should not be on hackage with dependencies that lead cabal-install to try to upgrade it. I see three ways to fix this

[snip]

  3) Fix cabal-install to avoid the package.

If ghc-pkg has a notion of "this is a boot library, don't upgrade me!" I think this is a viable option; it may also make it easier for distro packagers to be able to determine deps. -- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com IvanMiljenovic.wordpress.com