Question

Here’s the error ghci throws when I try to run my program.

>Loading package primitive-0.3.1 ...

>GHCi runtime linker: fatal error: I found a duplicate definition for symbol
>memset_off
>whilst processing object file
>/home/mlitchard/.cabal/lib/primitive-0.3.1/ghc-7.0.3/HSprimitive-0.3.1.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.

Here’s the source, followed by what I think this problem is.

>import Network.HTTP.Enumerator
>import qualified Data.ByteString.Lazy as L
>import Data.ByteString
>import Data.Attoparsec.Enumerator (iterParser)
>import Data.Aeson
>import Data.Attoparsec
>import Data.Maybe
>import Network.URI
>import Network.HTTP

>main :: IO ()
>main = do
>req <- openURL "https://pkg.cudaops.com/cgi-bin/qaLinkEditor.cgi?json=1"
>print $ parse json req

>openURL :: String -> IO ByteString
>openURL url = getResponseBody =<< simpleHTTP (mkRequest GET (fromJust $ parseURI url))

I have two versions of primitive.0.3.1 and 0.4.0.1

>0.3.1 is needed by aeson 0.3.2.12
>0.4.0.1 is needed by http-enumerator-0.7.1.1

ghc-pkg has revealed I have a whole mess of broken packages. Perhaps I should delete ghc and cabal and start from scratch?

Answer 1

The problem stems from an incorrect solution to this problem

Here is the actual problem causing this trouble, with reference to the solution.