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[Haskell-cafe] Hint causes GHCi linker error under Windows

Subject: [Haskell-cafe] Hint causes GHCi linker error under Windows
From: Martin Hofmann
Date: Fri, 11 Dec 2009 11:04:14 +0100
The following hint code causes GHCi to crash under Windows:

>  runInterpreter $ loadModules ["SomeModule.hs"]

The error message is: 

GHCi runtime linker: fatal error: I found a duplicate definition for
symbol _hs_gtWord64 whilst processing object file
   C:\Programme\Haskell Platform\2009.2.0.2\ghc-prim-0.1.0.0
HSghc-prim-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.

The problem does not occur under Unix or with a compiled program. IMHO
hint tries to start a second instance of GHCi which is not
allowed/possible under Windows. If this is the case a more telling error
message would be helpful.

I used the Haskell Platform, version 2009.2.0.2 under Windows XP. My
package.conf is:

C:/Programme/Haskell Platform/2009.2.0.2\package.conf:
    Cabal-1.6.0.3, GHood-0.0.3, GLUT-2.1.1.2, HTTP-4000.0.6,
    HUnit-1.2.0.3, MonadCatchIO-mtl-0.2.0.0, OpenGL-2.2.1.1,
    QuickCheck-1.2.0.0, Win32-2.2.0.0, ansi-terminal-0.5.0,
    ansi-wl-pprint-0.5.1, array-0.2.0.0, base-3.0.3.1, base-4.1.0.0,
    bimap-0.2.4, bytestring-0.9.1.4, cgi-3001.1.7.1,
    containers-0.2.0.1, cpphs-1.9, directory-1.0.0.3, (dph-base-0.3),
    (dph-par-0.3), (dph-prim-interface-0.3), (dph-prim-par-0.3),
    (dph-prim-seq-0.3), (dph-seq-0.3), extensible-exceptions-0.1.1.0,
    fgl-5.4.2.2, filepath-1.1.0.2, (ghc-6.10.4), ghc-mtl-1.0.1.0,
    ghc-paths-0.1.0.6, ghc-prim-0.1.0.0, haddock-2.4.2,
    haskeline-0.6.2.2, haskell-src-1.0.1.3, haskell-src-exts-1.3.4,
    haskell98-1.0.1.0, hint-0.3.2.1, hpc-0.5.0.3, html-1.0.1.2,
    integer-0.1.0.1, mtl-1.1.0.2, network-2.2.1.4, old-locale-1.0.0.1,
    old-time-1.0.0.2, packedstring-0.1.0.1, parallel-1.1.0.1,
    parsec-2.1.0.1, pointless-haskell-0.0.1, pretty-1.0.1.0,
    process-1.0.1.1, random-1.0.0.1, regex-base-0.72.0.2,
    regex-compat-0.71.0.1, regex-posix-0.72.0.3, rts-1.0, stm-2.1.1.2,
    syb-0.1.0.1, template-haskell-2.3.0.1, time-1.1.2.4,
    utf8-string-0.3.6, xhtml-3000.2.0.1, zlib-0.5.0.0

Thanks,

Martin

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