Hello, Alp.

Thank you for your response. Currently, I am extracting the information from the 00-index.tar.gz, and planning to use cabal-dev for the builds. Using the cabal tool directly looks like a very bad idea to me. I am still interested in knowing if there is some related job already done, or any other clever ideas that I didn't manage to think of. However, this looks like the best approach right now.

Thank you,

Daniel Díaz.

On Thu, Jul 4, 2013 at 2:36 PM, Alp Mestanogullari <alpmestan@gmail.com> wrote:

You can just write a bash script that will do: 

    cabal install --constraint='bar == v'

for all the values of 'v' (0.1, 0.2, 1.2.5.1, ...) you are interested in. You can be aware of all the existing versions just using the directory listing in http://hackage.haskell.org/packages/archive/containers/ (for the 'containers' package in this case) or by using cabal-install cleverly maybe? 

I just saw 'cabal info containers' gives a list of available versions, up to a point... after which it says "(and 4 others)". So maybe go see how 'cabal info' does this? But all in all, this should give you enough to work out a nice solution.

On Thu, Jul 4, 2013 at 12:56 PM, Daniel Díaz Casanueva <dhelta.diaz@gmail.com> wrote:

Hello everyone.

I would like to check what dependencies is one of my packages compatible with. For example, say I have a package called "foo" that depends on package "bar". Most likely, "foo" does not build with each version of "bar". What I want to do is try to build "foo" with each single version of "bar" (not manually).

What is the best approach to this?

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Alp Mestanogullari