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POCalling Haskell from Java with C in between
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2011-11-01T00:41:16.890
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2012-06-04T06:02:51.470
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2011-11-01T19:36:23.940
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text
Body
This probably sounds like a nightmare, but I'd really like to get this working. I am using this example for the most part: <a href="http://www.haskell.org/haskellwiki/Calling_Haskell_from_C">Calling C from Haskell</a> and am trying to get this working on ubuntu. I am running this in java: <pre><code>package test; public class JniTest { public native int fib(int x); } </code></pre> this in c after creating the .h file with javah: (test_JniTest.c) <pre><code>#include "test_JniTest.h" #include "Safe_stub.h" JNIEXPORT jint JNICALL Java_test_JniTest_fib(JNIEnv * e, jobject o, jint f) { return fibonacci_hs(f); } </code></pre> and then for reference in haskell (before stub): (Safe.hs) <pre><code>module Safe where import Foreign.C.Types fibonacci :: Int -> Int fibonacci n = fibs !! n where fibs = 0 : 1 : zipWith (+) fibs (tail fibs) fibonacci_hs :: CInt -> CInt fibonacci_hs = fromIntegral . fibonacci . fromIntegral foreign export ccall fibonacci_hs :: CInt -> CInt </code></pre> and this is what i'm trying to compile it with: <blockquote> ghc -c -O Safe.hs </blockquote> followed by: <blockquote> ghc -shared -o libTest.jnilib -optc-O test_JniTest.c -I/usr/lib/jvm/java-6-sun-1.6.0.26/include -I/usr/lib/jvm/java-6-sun-1.6.0.26/include/linux </blockquote> and I am getting this error: <blockquote> /usr/bin/ld: test_JniTest.o: relocation R_X86_64_PC32 against undefined symbol `fibonacci_hs' can not be used when making a shared object; recompile with -fPIC /usr/bin/ld: final link failed: Bad value collect2: ld returned 1 exit status </blockquote> I am not a c expert by any means and have no idea what to do about this. I tried compiling various ways with -fPIC, but I kept on getting the same error. Any idea what I might be doing wrong? Thanks!
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<java><c><linux><haskell><ubuntu>
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Calling Haskell from Java with C in between
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