[Haskell-cafe] Problem with plugins

[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 <jeremy at n-heptane.com>
>
> 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
> <timo.v.holtz at googlemail.com> 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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> >