I was hoping to embed a Haskell interpreter using hint so that I could write plugins in Haskell to use with my program. I don't want to have to ship the entire Haskell platform for my executables.
Normally, Haskell executables are pretty self-contained. For example, erasing the PATH does not cause a problem:
$ PATH=. Hello
Hello world
However, a simple test program using runInterpreter bombs if I erase the PATH:
$ PATH=. TryHint
GhcException "panic! (the 'impossible' happened)\n (GHC version 7.8.3 for x86_64-apple-darwin):\n\tDynamic linker not initialised\n\nPlease report this as a GHC bug: http://www.haskell.org/ghc/reportabug\n"
What libraries or executables have to be available in the environment for it to work?
otool doesn't give much guidance:
otool -L TryHint
TryHint:
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1213.0.0)
/usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current version 7.0.0)
/usr/local/lib/libgmp.10.dylib (compatibility version 13.0.0, current version 13.0.0)
The test code for TryHint does not do much:
import Control.Monad
import Language.Haskell.Interpreter
main = do
f <- runInterpreter $ loadModules ["Test"] >> setTopLevelModules ["Test"] >> interpret "f" (as :: Int -> Int)
case f of
Left e -> print e
Right r -> mapM_ (print . r) [1..10]
It just binds f to a function in Test.hs to be interpreted at run-time. Test.hs looks like this:
module Test where
f :: Int -> Int
f x = x + 1
