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    <p>To anyone interested, this is the test case that I've finally got working:</p> <hr> <h2>M.hs</h2> <pre><code>module Foo where foreign export ccall foo :: Int -&gt; Int foo :: Int -&gt; Int foo = floor . sqrt . fromIntegral </code></pre> <hr> <h2>test.cpp</h2> <pre><code>#include &lt;iostream&gt; #include "M_stub.h" int main(int argc, char *argv[]) { std::cout &lt;&lt; "hello\n"; hs_init(&amp;argc, &amp;argv); std::cout &lt;&lt; foo(500) &lt;&lt; "\n"; hs_exit(); return 0; } </code></pre> <hr> <p>I did the compiles &amp; linking on my Windows machine. The commands to run (in this order) are:</p> <pre><code>&gt;ghc -XForeignFunctionInterface -c M.hs &gt;g++ -c test.cpp -I"c:\Program Files\Haskell Platform\2010.2.0.0\lib\include" &gt;g++ -o test.exe -DDONT_WANT_WIN32_DLL_SUPPORT M.o M_stub.o test.o -L"C:\Program Files\Haskell Platform\2010.2.0.0\lib\haskell98-1.0.1.1" -L"C:\Program Files\Haskell Platform\2010.2.0.0\lib\random-1.0.0.2" -L"C:\Program Files\Haskell Platform\2010.2.0.0\lib\time-1.1.4" -L"C:\Program Files\Haskell Platform\2010.2.0.0\lib\process-1.0.1.3" -L"C:\Program Files\Haskell Platform\2010.2.0.0\lib\directory-1.0.1.1" -L"C:\Program Files\Haskell Platform\2010.2.0.0\lib\old-time-1.0.0.5" -L"C:\Program Files\Haskell Platform\2010.2.0.0\lib\old-locale-1.0.0.2" -L"C:\Program Files\Haskell Platform\2010.2.0.0\lib\filepath-1.1.0.4" -L"C:\Program Files\Haskell Platform\2010.2.0.0\lib\Win32-2.2.0.2" -L"C:\Program Files\Haskell Platform\2010.2.0.0\lib\bytestring-0.9.1.7" -L"C:\Program Files\Haskell Platform\2010.2.0.0\lib\array-0.3.0.1" -L"C:\Program Files\Haskell Platform\2010.2.0.0\lib\base-4.2.0.2" -L"C:\Program Files\Haskell Platform\2010.2.0.0\lib\integer-gmp-0.2.0.1" -L"C:\Program Files\Haskell Platform\2010.2.0.0\lib\ghc-prim-0.2.0.0" -L"C:\Program Files\Haskell Platform\2010.2.0.0\lib" -L"C:\Program Files\Haskell Platform\2010.2.0.0\lib/gcc-lib" -lHSrtsmain -lHShaskell98-1.0.1.1 -lHSrandom-1.0.0.2 -lHStime-1.1.4 -lHSprocess-1.0.1.3 -lHSdirectory-1.0.1.1 -lHSold-time-1.0.0.5 -lHSold-locale-1.0.0.2 -lHSfilepath-1.1.0.4 -lHSWin32-2.2.0.2 -luser32 -lgdi32 -lwinmm -ladvapi32 -lshell32 -lshfolder -lHSbytestring-0.9.1.7 -lHSarray-0.3.0.1 -lHSbase-4.2.0.2 -lwsock32 -luser32 -lshell32 -lHSinteger-gmp-0.2.0.1 -lHSghc-prim-0.2.0.0 -lHSrts -lm -lwsock32 -u _ghczmprim_GHCziTypes_Izh_static_info -u _ghczmprim_GHCziTypes_Czh_static_info -u _ghczmprim_GHCziTypes_Fzh_static_info -u _ghczmprim_GHCziTypes_Dzh_static_info -u _base_GHCziPtr_Ptr_static_info -u _base_GHCziWord_Wzh_static_info -u _base_GHCziInt_I8zh_static_info -u _base_GHCziInt_I16zh_static_info -u _base_GHCziInt_I32zh_static_info -u _base_GHCziInt_I64zh_static_info -u _base_GHCziWord_W8zh_static_info -u _base_GHCziWord_W16zh_static_info -u _base_GHCziWord_W32zh_static_info -u _base_GHCziWord_W64zh_static_info -u _base_GHCziStable_StablePtr_static_info -u _ghczmprim_GHCziTypes_Izh_con_info -u _ghczmprim_GHCziTypes_Czh_con_info -u _ghczmprim_GHCziTypes_Fzh_con_info -u _ghczmprim_GHCziTypes_Dzh_con_info -u _base_GHCziPtr_Ptr_con_info -u _base_GHCziPtr_FunPtr_con_info -u _base_GHCziStable_StablePtr_con_info -u _ghczmprim_GHCziBool_False_closure -u _ghczmprim_GHCziBool_True_closure -u _base_GHCziPack_unpackCString_closure -u _base_GHCziIOziException_stackOverflow_closure -u _base_GHCziIOziException_heapOverflow_closure -u _base_ControlziExceptionziBase_nonTermination_closure -u _base_GHCziIOziException_blockedIndefinitelyOnMVar_closure -u _base_GHCziIOziException_blockedIndefinitelyOnSTM_closure -u _base_ControlziExceptionziBase_nestedAtomically_closure -u _base_GHCziWeak_runFinalizzerBatch_closure -u _base_GHCziTopHandler_runIO_closure -u _base_GHCziTopHandler_runNonIO_closure -u _base_GHCziConc_ensureIOManagerIsRunning_closure -u _base_GHCziConc_runSparks_closure -u _base_GHCziConc_runHandlers_closure -lHSffi </code></pre> <p>The long list of parameters for the last g++ command is from running</p> <pre><code>&gt;ghc M.hs -v </code></pre> <p>and then copying the command where it says "***Linker:" (some of the first parameters need to be removed).</p> <hr> <p>The result:</p> <pre><code>&gt;test hello 22 </code></pre>
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