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

That worked beautifully. Thanks. On Wed, Mar 23, 2011 at 7:00 PM, Blake Rain 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 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

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.

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-- Best regards, Cheshkov Anton Phone: +7 909 005 18 82 Skype: cheshkov_anton

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