I have a web server which load server extensions. these extensions eval-uate configuration files that contains code (user-editable workflow descriptions). The problem is that I need common definitions (inside imported modules) for the extensions and for the configuration files. This is not permitted by ha-plugins.
The minimal code example are the files below. main loads eval.hs , that evaluate a expression. The common definitions are in Include.hs. The error is:
GHCi runtime linker: fatal error: I found a duplicate definition for symbol
Include_sum1_srt
whilst processing object file
/home/magocoal/haskell/devel/votesWorkflow/src/unused/tests/Include.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.
Do you kno how to solve the problem while maintaining the functionality?
-------Include.hs-------
module Include where
sum [x,y]= x+y
------Main.hs-----
module Main where
import Include
import System.Plugins
main= do
s <-loadExec "eval.o" "mainc"
print s
loadExec:: String-> String->IO String
loadExec file method = do
mv <- load file ["."] [] method
case mv of
LoadSuccess mod v -> v :: IO String
LoadFailure msg -> return $ concat msg
------------Eval.hs--------
module Eval(mainc) where
import System.IO.Unsafe
import System.Eval.Haskell
mainc= do i <- unsafeEval_ "sum1 [1,2]" ["Include"] [] []["."] :: IO (Either [String] Int)
return $ show i