[Haskell-cafe] duplicate definition for symbol

[Henk-Jan van Tuyl]

L.S.,

I am trying to run a program in GHCi, but I get a meesage that an object  
file is loaded twice; it appears that two different versions of package  
"process" are loaded, see the session text below. How can I solve this?


GHCi, version 6.10.1: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer ... linking ... done.
Loading package base ... linking ... done.
Prelude> :load "Main.lhs"
[1 of 1] Compiling Main             ( Main.lhs, interpreted )
Ok, modules loaded: Main.
*Main> :main
Loading package syb ... linking ... done.
Loading package base-3.0.3.0 ... linking ... done.
Loading package array-0.2.0.0 ... linking ... done.
Loading package containers-0.2.0.0 ... linking ... done.
Loading package bytestring-0.9.1.4 ... linking ... done.
Loading package old-locale-1.0.0.1 ... linking ... done.
Loading package old-time-1.0.0.1 ... linking ... done.
Loading package filepath-1.1.0.1 ... linking ... done.
Loading package Win32-2.2.0.0 ... linking ... done.
Loading package directory-1.0.0.2 ... linking ... done.
Loading package random-1.0.0.1 ... linking ... done.
Loading package time-1.1.2.2 ... linking ... done.
Loading package stm-2.1.1.2 ... linking ... done.
Loading package split-0.1.1 ... linking ... done.
Loading package HUnit-1.2.0.3 ... linking ... done.
Loading package QuickCheck-1.2.0.0 ... linking ... done.
Loading package process-1.0.1.1 ... linking ... done.
Loading package haskell98 ... linking ... done.
Loading package mtl-1.1.0.2 ... linking ... done.
Loading package parsec-2.1.0.1 ... linking ... done.
Loading package network-2.2.0.1 ... linking ... done.
Loading package hslogger-1.0.7 ... linking ... done.
Loading package process-1.0.1.0 ...

GHCi runtime linker: fatal error: I found a duplicate definition for symbol
    _runInteractiveProcess
whilst processing object file
    C:\Programs\ghc\ghc-6.10.1\process-1.0.1.0\HSprocess-1.0.1.0.o
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.


-- 
Met vriendelijke groet,
Henk-Jan van Tuyl


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