[Haskell-cafe] There is something wrong in derive-0.1.2 package.

Duncan Coutts duncan.coutts at worc.ox.ac.uk
Tue Oct 14 02:05:47 EDT 2008

On Tue, 2008-10-14 at 13:51 +0800, Magicloud wrote:
> Sigh again, something that always makes me think that cabal is unusable....

> ~/.cabal/lib/HTTP-3001.1.3/ghc-6.8.3/libHSHTTP-3001.1.3.a(Browser.o)(.text+0x5aa6): In function `rp46_info':
> : undefined reference to `mtlzm1zi1zi0zi1_ControlziMonadziIdentity_zdf2_closure'

What is almost certainly going on is that mtl has been rebuilt but the
other packages that depend on it (like http) have not.

I wonder if we could detect this better in ghc-6.10.2. There are ABI
hashes available, so if we could record them in the package registration
info then we should be able to detect when a dependent package has
changed ABI. The longer term solution is to use a nix-style persistent
package store.

The short term solution in this case is probably to rebuild the HTTP


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