I'd like to get the scenegraph package (http://hackage.haskell.org/cgi-bin/hackage-scripts/package/scenegraph) to work, but am encountering linkage errors. I installed scenegraph 0.1.0.1 for ghc-6.10.1 on Fedora 10 Linux. # runghc Setup configure --prefix=/opt # runghc Setup build # runghc Setup install Then I created this little program based on the example at http://www.haskell.org/haskellwiki/SceneGraph (in file SGTest.hs): module Main where import Graphics.SceneGraph import Control.Monad.Identity main :: IO () main = runScene $ osgt $ myScene myScene :: OSGT Identity SceneNode myScene = cube 0.5 `colour` Green `scale` v1x 40 `translate` vy 2 <+> camera `translate` vy (-10) <+> light `translate` vz 10 Then I compiled it and got a long list of linker errors; here are the first few lines: ghc --make SGTest Linking SGTest ... /opt/lib/scenegraph-0.1.0.1/ghc-6.10.1/libHSscenegraph-0.1.0.1.a(Basic__210.o): In function `sdE1_info': (.text+0x8d): undefined reference to `scenegraphzm0zi1zi0zi1_GraphicsziSceneGraphziMatrix_translateM_closure' /opt/lib/scenegraph-0.1.0.1/ghc-6.10.1/libHSscenegraph-0.1.0.1.a(Basic__210.o): In function `scenegraphzm0zi1zi0zi1_GraphicsziSceneGraphziBasic_translate_srt': (.data+0x0): undefined reference to `scenegraphzm0zi1zi0zi1_GraphicsziSceneGraphziMatrix_translateM_closure' /opt/lib/scenegraph-0.1.0.1/ghc-6.10.1/libHSscenegraph-0.1.0.1.a(Basic__207.o): In function `sdDq_info': (.text+0x7e): undefined reference to `scenegraphzm0zi1zi0zi1_GraphicsziSceneGraphziMatrix_scaleM_info' /opt/lib/scenegraph-0.1.0.1/ghc-6.10.1/libHSscenegraph-0.1.0.1.a(Basic__207.o): In function `scenegraphzm0zi1zi0zi1_GraphicsziSceneGraphziBasic_scale_srt': (.data+0x0): undefined reference to `scenegraphzm0zi1zi0zi1_GraphicsziSceneGraphziMatrix_scaleM_closure' /opt/lib/scenegraph-0.1.0.1/ghc-6.10.1/libHSscenegraph-0.1.0.1.a(Basic__491.o):(.text+0x27): undefined reference to `__stginit_scenegraphzm0zi1zi0zi1_GraphicsziSceneGraphziUtils_' Also with this command, same result but a lot more detail: ghc --make -v -package scenegraph SGTest With -v, the output includes gcc -v -o SGTest -DDONT_WANT_WIN32_DLL_SUPPORT SGTest.o -L/opt/lib/scenegraph-0.1.0.1/ghc-6.10.1 -L/opt/lib/hmatrix-0.5.1.1/ghc-6.10.1 -L/opt/lib/storable-complex-0.2/ghc-6.10.1 ... -lHSscenegraph-0.1.0.1 -lHShmatrix-0.5.1.1 -lgsl -llapack -lHSstorable-complex-0.2 -lHSQuickCheck-1.2.0.0 ... which seems to show that the proper -L and -l options are included. If I'm decoding the first "undefined reference" symbol -- (.text+0x8d): undefined reference to `scenegraphzm0zi1zi0zi1_GraphicsziSceneGraphziMatrix_translateM_closure' -- correctly, then the missing symbol is in the scenegraph-0.1.0.1 package, in module Graphics.SceneGraph.Matrix, and is associated with the translateM function defined in that module. I looked for this symbol with nm: # pwd /opt/lib/scenegraph-0.1.0.1/ghc-6.10.1 # nm HSscenegraph-0.1.0.1.o | grep translateM U scenegraphzm0zi1zi0zi1_GraphicsziSceneGraphziMatrix_translateM_closure U scenegraphzm0zi1zi0zi1_GraphicsziSceneGraphziMatrix_translateM_info # nm libHSscenegraph-0.1.0.1.a | grep translateM U scenegraphzm0zi1zi0zi1_GraphicsziSceneGraphziMatrix_translateM_closure U scenegraphzm0zi1zi0zi1_GraphicsziSceneGraphziMatrix_translateM_info but I understand the "U" means that it is referenced by some other function in these files, but is undefined in them. Since the module Graphics.SceneGraph.Matrix does not declare any exports, I thought that might be the reason the symbol was undefined. But looking back at the Haskell 98 language definition, I found that the absence of an export declaration in a module means that all the symbols of the module are exported. Also, I notice that in the cabal file for scenegraph, the list of exposed modules Exposed-Modules: Graphics.SceneGraph, Graphics.SceneGraph.Basic, Graphics.SceneGraph.Vector, Graphics.SceneGraph.Render, Graphics.SceneGraph.SimpleViewport, Graphics.SceneGraph.GraphViz, Graphics.SceneGraph.Library, Graphics.SceneGraph.Dump, Graphics.SceneGraph.Textures does not include Graphics.SceneGraph.Matrix, but that should only mean that I can't call functions of that module directly -- not that the other SceneGraph modules can't call them -- right? So, why is this symbol undefined? And how can I get it to work? Oh by the way: I can actually use this package if I move into its src directory, add a main function to Examples.hs, and compile and run it right there. Just can't use it as an installed library, it seems. -- ___ ___ __ _ / _ \ / _ \| | | | Gregory D. Weber, Associate Professor / /_\// / | | | /\ | | Indiana University East / /_\\/ /__| | |/ \| | http://mypage.iu.edu/~gdweber/ \____/\_____/\___/\__/ Tel. (765) 973-8420; FAX (765) 973-8550