[web-devel] GHCi runtime linker: fatal error: I found a duplicate definition for symbol (Yesod)

[Rick Richardson]

That worked beautifully. Thanks.


On Wed, Mar 23, 2011 at 7:00 PM, Blake Rain <blake.rain at gmail.com> wrote:

> I too had a the same problem with duplicate symbols from libHSghc, and
> it seems to be a problem with yesod's dynamic server (or perhaps with
> Hint).
>
> My solution was first to remove the dependency on wai-handler-devel in
> the yesod package by using the 'production' flag, like so:
>
> $ cabal install yesod -fproduction
>
> For running a dynamic server, the wai-handler-devel package installs an
> executable called wai-handler-devel. You can use this rather than the
> "runhaskell devel-server.hs" by providing the port, module and function
> from your "devel-server.hs" file as arguments:
>
> $ wai-handler-devel 3000 MySiteModule withMySite
>
> The dynamic recompilation of wai-handler-devel is very useful, and I
> hope this helps.
>
> On Wed, 2011-03-23 at 14:22 -0400, Rick Richardson wrote:
> > I removed all but network-2.2.1.0 and rebuilt everything, still no
> > luck. But I'm sure you have set me on the right track, I will
> > experiment with other permutations.
> >
> >
> > Thanks.
> >
> >
> >
> >
> > On Wed, Mar 23, 2011 at 1:27 PM, Anton Cheshkov <acheshkov at gmail.com>
> > wrote:
> >         Hi Rick! I got the the same error day ago on my server.
> >         Probably it happens because you have two network packages in
> >         you system.
> >
> >         Try to compile all your packages  only on  network-2.2.1.10,
> >         and delete package network-2.3
> >
> >
> >         Hope it helps you
> >
> >
> >         2011/3/23 Rick Richardson <rick.richardson at gmail.com>
> >
> >
> >
> >                 I just installed the generic 7.0.2 binary on Ubuntu
> >                  on both 32 bit and 64 bit machines.  Then I rm'd
> >                   .ghc and .cabal  then fetched the current haskell
> >                 platform. Built and installed.
> >
> >
> >                 After cabal installing all of the dependencies cabal
> >                 said were required for yesod,  I run yesod.. the
> >                 script creates the project.
> >
> >
> >                 When executing runhaskell devel-server.hs  I get this
> >                 message
> >
> >
> >                 GHCi runtime linker: fatal error: I found a duplicate
> >                 definition for symbol
> >                    ghczm7zi0zi2_AsmCodeGen_zdfMonadCmmOptM2_closure
> >                 whilst processing object file
> >
> >                  /usr/local/lib/ghc-7.0.2/ghc-7.0.2/libHSghc-7.0.2.a
> >                 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.
> >
> >
> >
> >
> >                 it's the same on both 32 and 64 bit.
> >
> >
> >                 Any ideas?   I am going to try to build 7.0.2 from
> >                 source to see if that fixes it.
> >
> >
> >                 _______________________________________________
> >                 web-devel mailing list
> >                 web-devel at haskell.org
> >                 http://www.haskell.org/mailman/listinfo/web-devel
> >
> >
> >
> >
> >         --
> >         Best regards,
> >         Cheshkov Anton
> >         Phone: +7 909 005 18 82
> >         Skype: cheshkov_anton
> >
> >
> >
> > _______________________________________________
> > web-devel mailing list
> > web-devel at haskell.org
> > http://www.haskell.org/mailman/listinfo/web-devel
>
>
>
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