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POBuilding a haskell interpreter (hint) as dynamic library, useable from C++: Missing Interpreter.dyn_hi
 

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  1. POBuilding a haskell interpreter (hint) as dynamic library, useable from C++: Missing Interpreter.dyn_hi
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    <p>I want to create a haskell interpreter that I can use from C++ on linux.</p> <p>I have a file FFIInterpreter.hs which implements the interpreter in haskell and exports the functions via FFI to C++.</p> <pre><code>module FFIInterpreter where import Language.Haskell.Interpreter import Data.IORef import Foreign.StablePtr import Foreign.C.Types import Foreign.C.String import Control.Monad import Foreign.Marshal.Alloc type Session = Interpreter () type Context = StablePtr (IORef Session) foreign export ccall createContext :: CString -&gt; IO Context createContext :: CString -&gt; IO Context createContext name = join ((liftM doCreateContext) (peekCString name)) where doCreateContext :: ModuleName -&gt; IO Context doCreateContext name = do let session = newModule name _ &lt;- runInterpreter session liftIO $ newStablePtr =&lt;&lt; newIORef session newModule :: ModuleName -&gt; Session newModule name = loadModules [name] &gt;&gt; setTopLevelModules [name] foreign export ccall freeContext :: Context -&gt; IO () freeContext :: Context -&gt; IO () freeContext = freeStablePtr foreign export ccall runExpr :: Context -&gt; CString -&gt; IO CString runExpr :: Context -&gt; CString -&gt; IO CString runExpr env input = join ((liftM newCString) (join (((liftM liftM) doRunExpr) env (peekCString input)))) where doRunExpr :: Context -&gt; String -&gt; IO String doRunExpr env input = do env_value &lt;- deRefStablePtr env tcs_value &lt;- readIORef env_value result &lt;- runInterpreter (tcs_value &gt;&gt; eval input) return $ either show id result foreign export ccall freeString :: CString -&gt; IO () freeString :: CString -&gt; IO () freeString = Foreign.Marshal.Alloc.free </code></pre> <p>When I compile the whole project with ghc, everything works fine. I use the following command:</p> <pre><code>ghc -no-hs-main FFIInterpreter.hs main.cpp -lstdc++ </code></pre> <p>But the haskell module is only a small piece of the C++ project and I don't want the whole project to depend on ghc.</p> <p>So I want to build a dynamic library with ghc and then link it to the project using g++.</p> <pre><code>$ ghc -shared -fPIC FFIInterpreter.hs module_init.c -lstdc++ [1 of 1] Compiling FFIInterpreter ( FFIInterpreter.hs, FFIInterpreter.o ) Linking a.out ... /usr/bin/ld: /usr/lib/haskell-packages/ghc/lib/hint-0.3.3.2/ghc-7.0.3/libHShint-0.3.3.2.a(Interpreter.o): relocation R_X86_64_32S against `.data' can not be used when making a shared object; recompile with -fPIC /usr/lib/haskell-packages/ghc/lib/hint-0.3.3.2/ghc-7.0.3/libHShint-0.3.3.2.a: could not read symbols: Bad value collect2: ld gab 1 als Ende-Status zurück </code></pre> <p>So I added the -dynamic keyword, but that also doesn't work:</p> <pre><code>$ ghc -dynamic -shared -fPIC FFIInterpreter.hs librarymain.cpp -lstdc++ FFIInterpreter.hs:3:8: Could not find module `Language.Haskell.Interpreter': Perhaps you haven't installed the "dyn" libraries for package `hint-0.3.3.2'? Use -v to see a list of the files searched for. </code></pre> <p>I searched my system for Interpreter.dyn_hi but didn't find it. Is there a way to get it? I also tried to install hint manually, but this also doesn't deliver the Interpreter.dyn_hi file.</p>
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