My example was somewhat wrong, since it only works with runghc >= 7.0 and not <7. Here a better example which has exactly the same issues as my code. Main.hs: module Main where import Main1 main = main1 Main1.hs: module Main1 (main1, add) where import System.Plugins add = (+1) main1 :: IO () main1 = do putStrLn "Loading" makeAll "Plug.hs" [] mv <- load_ "Plug.o" ["."] "thing" putStrLn "Loaded" case mv of LoadFailure msgs -> putStrLn "fail" >> print msgs LoadSuccess _ v -> putStrLn "success" >> print (v::Integer) Plug.hs: module Plug (thing) where import Main1 thing :: Integer thing = add 1234000 - timo 2012/6/20 Timo von Holtz :

I compile the files dynamically, so the compiler version is out of the question. I already tested -O0. In the modules I dynamically load, I import some of the modules the main program also uses. I can reproduce the exact same error with this simple example:

Main.hs: module Main (main, add) where

import System.Plugins

add = (+1)

main :: IO () main = do   putStrLn "Loading"   makeAll "Plug.hs" []   mv <- load_ "Plug.o" ["."] "thing"   putStrLn "Loaded"   case mv of     LoadFailure msgs -> putStrLn "fail" >> print msgs     LoadSuccess _ v -> putStrLn "success" >> print (v::Integer)

Plug.hs: module Plug (thing) where

import Main

thing :: Integer thing = add 1234000

- timo 2012/6/20 Jeremy Shaw

...

I really have no idea. I am the new plugins maintainer -- but so far that mostly means I am willing to apply darcs patches and uploading things to hackage. I have not had a chance to really dig into plugins.

I will now make some wild guesses.

 1. does it matter if you compile with -O2 vs -O0 ?

 2. do those .o  files actually exist?

 3. Are there perhaps .o and .hi files in your project directory that were compiled with GHC 7.0 but now you are trying to load them with >= 7.0?

- jeremy

On Tue, Jun 19, 2012 at 10:30 AM, Timo von Holtz wrote:

...

Hi,

I'm currently working on extending the hascat Server. My problem is, that for whatever odd reason it will only work on GHC < 7.0 or alternatively if I execute it with runghc or in ghci. If I compile it with GHC>=7.0 and execute it, then I get this:

$ ~/.cabal/bin/hascat config.xml Installing "Root" at / hascat: /home/tvh/.cabal/lib/plugins-1.5.2.1/ghc-7.4.1/HSplugins-1.5.2.1.o: unknown symbol `ghczm7zi4zi1_ErrUtils_zdsinsertzugo3_info' hascat: unloadObj: can't find `/usr/lib/ghc/binary-0.5.1.0/HSbinary-0.5.1.0.o' to unload user error (unloadObj: failed) Installing "Hascat Server Info" at /ServerInfo/ hascat: /home/tvh/.cabal/lib/hascat-system-0.2/ghc-7.4.1/HShascat-system-0.2.o: unknown symbol `base_DataziMaybe_Nothing_closure' hascat: unloadObj: can't find `/usr/lib/ghc/Cabal-1.14.0/HSCabal-1.14.0.o' to unload user error (unloadObj: failed) Installing "Hascat Application Manager" at /Manager/ hascat: /home/tvh/.cabal/lib/hascat-system-0.2/ghc-7.4.1/HShascat-system-0.2.o: unknown symbol `base_DataziMaybe_Nothing_closure' hascat: unloadObj: can't find `/usr/lib/ghc/Cabal-1.14.0/HSCabal-1.14.0.o' to unload user error (unloadObj: failed) Installing "Hascat Application Deployer" at /Deployer/ hascat: /usr/lib/haskell-packages/ghc/lib/zlib-0.5.3.3/ghc-7.4.1/HSzlib-0.5.3.3.o: unknown symbol `base_GHCziForeignPtr_ForeignPtr_con_info' hascat: unloadObj: can't find `/usr/lib/ghc/Cabal-1.14.0/HSCabal-1.14.0.o' to unload user error (unloadObj: failed) Waiting for connections on port 8012

Is there a way to make this work?

Greetings Timo

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