I'm trying to run this simple example that I got from the Haskell wiki.
import GHC
import GHC.Paths ( libdir )
import DynFlags
main =
defaultErrorHandler defaultFatalMessager defaultFlushOut $ do
runGhc (Just libdir) $ do
dflags <- getSessionDynFlags
setSessionDynFlags dflags
target <- guessTarget "test_main.hs" Nothing
setTargets [target]
load LoadAllTargets
The error messages I'm getting are:
amy@wombat$ ghc --make amy15.hs
amy15.hs:1:8:
Could not find module ‘GHC’
It is a member of the hidden package ‘ghc-7.8.3’.
Use -v to see a list of the files searched for.
amy15.hs:3:8:
Could not find module ‘DynFlags’
It is a member of the hidden package ‘ghc-7.8.3’.
Use -v to see a list of the files searched for.
Now, ghc-7.8.3
is what I'm using to do the compilation, so obviously the package is installed.
amy@wombat$ cabal info ghc
* ghc (library)
Versions available: [ Not available from server ]
Versions installed: 7.8.3
... and so on
Why can't GHC see the ghc
package?
Apparently the ghc
package is hidden by default, at least if you install ghc manually the way I did, rather than installing the Haskell platform. So I needed to "un-hide" the package as follows:
sudo ghc-pkg expose ghc
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