[Haskell] Haddock not being able to read interface file

Simon Marlow simonmarhaskell at gmail.com
Tue Mar 6 06:09:53 EST 2007

Wolfgang Jeltsch wrote:
> Hello,
> I want to generate Haddock documentation for some Haskell files and want to 
> create hyperlinks to the base package’s documentation.  I’ve downloaded 
> <http://www.haskell.org/ghc/docs/latest/html/libraries/base/base.haddock> and 
> use the option
>     --read-interface=http://www.haskell.org/ghc/docs/latest/html/libraries/base,base.haddock
> in my Haddock command line.  However, Haddock outputs the following:
>     haddock: Warning: The interface file "base.haddock" could not be read.
>     Maybe it's from a later version of Haddock?
> This happens with Haddock 0.8 as well as the current development version of 
> Haddock.

It's possible the interface files are not portable between 32 and 64-bit 
machines, and you're using one generated for a different word size.  I haven't 
verified this, but I'll make a note to check for the next version of Haddock.  I 
imagine we'll move to using Data.Binary anyway, which should fix any 
non-portability issues.


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