[darcs-users] Error loading darcs-beta in GHCi: duplicate symbol

Robin Green greenrd at greenrd.org
Wed Jul 22 11:48:28 UTC 2009

I have just unsuccessfully tried to load a package which links against
darcs-beta in GHCi. It's a gitit plugin package, and gitit uses the GHC
API, driving GHCi programatically, to load plugins at runtime.
(I first tried linking against darcs 2.2.0, but there is a known issue
with that, so that didn't work.)

I get this error when I try to start gitit and it tries to load the
first plugin:

GHCi runtime linker: fatal error: I found a duplicate definition for
symbol sha224_h0
whilst processing object file
This could be caused by:
   * Loading two different object files which export the same symbol
   * Specifying the same object file twice on the GHCi command line
   * An incorrect `package.conf' entry, causing some object to be
     loaded twice.
GHCi cannot safely continue in this situation.  Exiting now.  Sorry.

How can I figure out what's causing this? Is there some library or
module that's been copied into a separate library on hackage, but still
exists in darcs-beta- Or might I be trying to load two versions
of the darcs package? How would I find out?


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