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    <h2>Initial Questions</h2> <blockquote> <p>Should this work with ghci? If so, what am I doing wrong or how can I fix the crash?</p> </blockquote> <p>On OSX 10.6.7 (using the Haskell Platform /w GHC 7.0.2) I could load your built shared lib into ghci as follows:</p> <pre><code>➜ GLFW-b git:(master) ✗ ghci dist/build/Graphics/UI/GLFW.hs -Lbuild/dynam ic -lglfw GHCi, version 7.0.2: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Loading package ffi-1.0 ... linking ... done. Loading object (dynamic) glfw ... done final link ... done [1 of 1] Compiling Graphics.UI.GLFW ( dist/build/Graphics/UI/GLFW.hs, inte rpreted ) Ok, modules loaded: Graphics.UI.GLFW. *Graphics.UI.GLFW&gt; initialize True </code></pre> <p>Note: I built the <code>glfw</code> libs using your provided <code>Makefile</code>, and additionally used your <code>.cabal</code> file to process <code>src/Graphics/UI/GLFW.hsc</code> and build <code>dist/build/Graphics/UI/GLFW.hs</code> (i.e. I'd previously run <code>cabal configure/build</code>).</p> <blockquote> <p>Can I just get by with the static .a version of the library with ghci?</p> </blockquote> <p>Yes, support for loading static libs was included in GHC 7.0.2 (<a href="http://www.haskell.org/ghc/docs/7.0.2/html/users_guide/release-7-0-2.html#id417924">GHC Manual</a>). <code>compiler/ghci/Linker.lhs</code> is a great read, and will give you a high-level sense of how ghci decides what to make of the command line arguments passed to it. Additionally, when navigating various platform support issues, I've found <a href="http://hackage.haskell.org/trac/ghc/wiki/SharedLibraries/PlatformSupport?redirectedfrom=DynamicLinking">this documentation</a> exceedingly useful.</p> <h2>Linking static archives with ghci.</h2> <p>As of writing, line <code>1113</code> of <code>compiler/ghci/Linker.hs</code> demonstrates that <code>ghci</code> currently requires that static archives be built by the package system (i.e. named <code>HSlibname.a</code>)</p> <pre><code>locateOneObj :: [FilePath] -&gt; String -&gt; IO LibrarySpec locateOneObj dirs lib | not ("HS" `isPrefixOf` lib) -- For non-Haskell libraries (e.g. gmp, iconv) we assume dynamic library = assumeDll | not isDynamicGhcLib -- When the GHC package was not compiled as dynamic library -- (=DYNAMIC not set), we search for .o libraries or, if they -- don't exist, .a libraries. = findObject `orElse` findArchive `orElse` assumeDll </code></pre> <p>Further investigation of cmd line argument parsing indicates that libraries specified are collected at line <code>402</code> in the <code>reallyInitDynLinker</code> function:</p> <pre><code>; classified_ld_inputs &lt;- mapM classifyLdInput cmdline_ld_inputs </code></pre> <p>where <code>classifyLdInput</code> is defined over </p> <pre><code>classifyLdInput :: FilePath -&gt; IO (Maybe LibrarySpec) classifyLdInput f | isObjectFilename f = return (Just (Object f)) | isDynLibFilename f = return (Just (DLLPath f)) | otherwise = do hPutStrLn stderr ("Warning: ignoring unrecognised input `" ++ f ++ "'") return Nothing </code></pre> <p>This means that outside of a package specification, there currently is <strong>no direct way to link an archive file in ghci</strong> (or said differently, there currently is no cmd-line argument to do so).</p> <h2>Fixing your cabal package</h2> <p>In your <code>.cabal</code> package specification, you are attempting to build <strong>two</strong> conflicting libraries:</p> <ul> <li><strong>A</strong>: link in a pre-built library (built according to your specification in <code>Setup.hs</code> and <code>Makefile</code>, and linked as per the <code>extra-libraries</code> and <code>extra-lib-dirs</code> directives)</li> <li><strong>B</strong>: build a new library inline (the <code>c-sources</code> and <code>frameworks</code> directives).</li> </ul> <p>A simple fix for the error above is to simply remove all directives enabling <strong>B</strong> when building for Mac OSX, as follows:</p> <pre><code> include-dirs: glfw/include glfw/lib - c-sources: - glfw/lib/enable.c - glfw/lib/fullscreen.c - glfw/lib/glext.c - glfw/lib/image.c - glfw/lib/init.c - glfw/lib/input.c - glfw/lib/joystick.c - glfw/lib/stream.c - glfw/lib/tga.c - glfw/lib/thread.c - glfw/lib/time.c - glfw/lib/window.c + + if !os(darwin) + c-sources: + glfw/lib/enable.c + glfw/lib/fullscreen.c + glfw/lib/glext.c + glfw/lib/image.c + glfw/lib/init.c + glfw/lib/input.c + glfw/lib/joystick.c + glfw/lib/stream.c + glfw/lib/tga.c + glfw/lib/thread.c + glfw/lib/time.c + glfw/lib/window.c </code></pre> <p>and</p> <pre><code> if os(darwin) - include-dirs: - glfw/lib/cocoa - frameworks: - AGL - Cocoa - OpenGL extra-libraries: glfw - extra-lib-dirs: build/static build/dynamic + extra-lib-dirs: build/dynamic </code></pre> <p>I've not tested anything beyond verifying that the following now works properly:</p> <pre><code>➜ GLFW-b git:(master) ✗ ghci GHCi, version 7.0.2: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Loading package ffi-1.0 ... linking ... done. Prelude&gt; :m + Graphics.UI.GLFW Prelude Graphics.UI.GLFW&gt; initialize Loading package GLFW-b-0.0.2.6 ... linking ... done. True Prelude Graphics.UI.GLFW&gt; </code></pre>
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    1. COThank you so much! I just verified this fix on my osx machine where it was previous failing.
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    2. COLooks like I'll need to tweak my Setup.hs a bit before this works completely. When I tried to build a program that depends on it I get this warning: ld: warning: directory 'build/dynamic' following -L not found
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    3. COWhen I run the the resulting program it says: dyld: Library not loaded: build/dynamic/libglfw.dylib Referenced from: /Users/dagit/tmp/test-glfw/./cabal-dev/bin/lesson01 Reason: image not found Trace/BPT trap
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