Hi,
The first argument of runGhc takes the directory where GHC's library
are. You can use the ghc-paths module
(http://hackage.haskell.org/package/ghc-paths ) for this.
Just install ghc-paths with cabal, import Ghc.Paths and call runGhc
with (Just libdir), it should get past the segfault.
On Sun, Feb 27, 2011 at 10:51 AM, Edward Amsden
I'm trying to run the following code. I'm not at all sure it's correct, it's based off of a bit of poking around in the ghc api. Running it with a command line argument like "show (5 + 2)" gives me a segmentation fault. Poking around with gdb and following the steps at http://hackage.haskell.org/trac/ghc/wiki/Debugging/CompiledCode yields precisely nothing, as even the "disassemble" command complains "No function contains program counter for selected frame."
Any ideas?
== code == module Main where
import GHC import DynFlags import Data.Dynamic import System
evalString :: Typeable a => String -> IO (Maybe a) evalString s = defaultErrorHandler defaultDynFlags $ runGhc Nothing $ do dynflags <- getSessionDynFlags setSessionDynFlags $ dynflags target <- guessTarget "Prelude" Nothing setTargets [target] load LoadAllTargets
dyn <- dynCompileExpr s return $ fromDynamic dyn
main = do (s:_) <- getArgs e <- evalString s putStrLn $ maybe "oops" id e
-- Edward Amsden Undergraduate Computer Science Rochester Institute of Technology www.edwardamsden.com
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