[CMake] SDL troubles on Mac OS X

[Michael Wild]

Hi

What is the install-name of SDL.framewor/SDL? What does

otool -L ~/Library/Frameworks/SDL.framework/SDL

tell you? I suspect it is something like

/Users/smekal/Library/Frameworks/SDL.framework/SDL:
	@executable_path/../Frameworks/SDL.framework/Versions/A/SDL (compatibility version 1.0.0, current version 1.0.0)
        ....

right? The second line is the one the linker uses to embed as a reference into your executable. The linker doesn't use it's actual location, but the library's install name.

Not sure what's going wrong in the CMake part, though...

IMHO FindSDL.cmake is buggy. The variable SDL_LIBRARY (and all its siblings) should only contain the framework, not Cocoa. Another variable, SDL_LIBRARIES (which should be uncached) should then contain the value of SDL_LIBRARY and all other required supporting libraries, such as Cocoa on OS X.

For now, what you can do is manually install the SDL framework using install(DIRECTORY ...) and the first list element of SDL_LIBRARY.

HTH

Michael

On 15. Dec, 2009, at 8:51 , Werner Smekal wrote:

> Hi,
> 
> I'm building an application on Mac OS X and link the SDL libraries into the app. Basically it all works fine (app runs, etc.), but if I want to use the BundleUtilities to fix/include the SDL framework into the app bundle I encounter errors. Problem is, that the references to the SDL libraries in the executable already point to "@executable_path/../Frameworks/...." although the SDL Frameworks are not there (see below). BundleUtilities is then not able to find the SDL Frameworks. In my opinion the references should point to ~/Library/Frameworks. I wonder why this app runs, but maybe Mac OS X looks for other standard locations if it doesn't find the library. I googled around but could only find one other post:
> 
> http://avidemux.org/admForum/viewtopic.php?id=5802
> 
> where it is mentioned that: "However, cmake "thinks" that the SDL.framework is already inside the bundle (and therefore doesn't copy it), but cmake can't find it in the next step."
> 
> Is this a cmake bug, a FindSDL.cmake bug or is it just me :)
> 
> Thanks for any help,
> Werner
> 
> 
> More information. Here is what I do:
> 
> 1) Download the SDL and SDL-Mixer Frameworks and copy them to ~/Library/Frameworks
> 
> 2) Try to find them with
> 
> find_package(SDL REQUIRED)
> include_directories(${SDL_INCLUDE_DIR})
> 
> find_package(SDL_mixer REQUIRED)
> include_directories(${SDLMIXER_INCLUDE_DIR})
> 
> which also works ok:
> 
> SDL_INCLUDE_DIR = /Users/smekal/Library/Frameworks/SDL.framework/Headers
>  SDL_LIBRARY = /Users/smekal/Library/Frameworks/SDL.framework;-framework Cocoa
>  SDLMIXER_INCLUDE_DIR = /Users/smekal/Library/Frameworks/SDL_mixer.framework/Headers
>  SDLMIXER_LIBRARY = /Users/smekal/Library/Frameworks/SDL_mixer.framework
> 
> 3) Link them to my target:
> 
> target_link_libraries(
> 	zct
> 		${SDL_LIBRARY}
> 		${SDLMIXER_LIBRARY}
> 		${OPENGL_LIBRARIES}
> )
> 
> 4) Verbose compile (example):
> 
> [  7%] Building CXX object CMakeFiles/zct.dir/src/game/app.cpp.o
> /usr/bin/c++    -mmacosx-version-min=10.5 -I/Users/smekal/Library/Frameworks/SDL.framework/Headers -I/Users/smekal/Library/Frameworks/SDL_mixer.framework/Headers   -Wall -F/Users/smekal/Library/Frameworks  -o CMakeFiles/zct.dir/src/game/app.cpp.o -c /Users/smekal/Development/zct/src/game/app.cpp
> "/Users/smekal/Applications/CMake 2.8-0.app/Contents/bin/cmake" -E cmake_progress_report /Users/smekal/Development/zct/build/CMakeFiles 2
> 
> 5) Verbose Link:
> 
> Linking CXX executable zct.app/Contents/MacOS/zct
> "/Users/smekal/Applications/CMake 2.8-0.app/Contents/bin/cmake" -E cmake_link_script CMakeFiles/zct.dir/link.txt --verbose=1
> /usr/bin/c++    -mmacosx-version-min=10.5 -Wl,-search_paths_first -headerpad_max_install_names  CMakeFiles/zct.dir/src/game/app.cpp.o CMakeFiles/zct.dir/src/game/being.cpp.o CMakeFiles/zct.dir/src/game/controller.cpp.o CMakeFiles/zct.dir/src/game/display.cpp.o CMakeFiles/zct.dir/src/game/main.cpp.o CMakeFiles/zct.dir/src/game/map.cpp.o CMakeFiles/zct.dir/src/game/organizer.cpp.o CMakeFiles/zct.dir/src/game/error.cpp.o CMakeFiles/zct.dir/src/game/location.cpp.o CMakeFiles/zct.dir/src/game/pathnode.cpp.o CMakeFiles/zct.dir/src/game/point.cpp.o CMakeFiles/zct.dir/src/game/tile.cpp.o CMakeFiles/zct.dir/src/game/SDLMain.m.o  -o zct.app/Contents/MacOS/zct -F/Users/smekal/Library/Frameworks -framework SDL -framework Cocoa -framework SDL_mixer -framework AGL -framework OpenGL
> 
> 6) and if I look at the references with otool:
> 
> pico:build smekal$ otool -L zct.app/Contents/MacOS/zct
> zct.app/Contents/MacOS/zct:
>        @executable_path/../Frameworks/SDL.framework/Versions/A/SDL (compatibility version 1.0.0, current version 1.0.0)
>        /System/Library/Frameworks/Cocoa.framework/Versions/A/Cocoa (compatibility version 1.0.0, current version 12.0.0)
> @executable_path/../Frameworks/SDL_mixer.framework/Versions/A/SDL_mixer (compatibility version 1.0.0, current version 1.0.0)
>        /System/Library/Frameworks/AGL.framework/Versions/A/AGL (compatibility version 1.0.0, current version 1.0.0)
>        /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL (compatibility version 1.0.0, current version 1.0.0)
>        /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.4.0)
>        /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)
>        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 111.1.4)
> /System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices (compatibility version 1.0.0, current version 32.0.0)
>        /usr/lib/libobjc.A.dylib (compatibility version 1.0.0, current version 227.0.0)
> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (compatibility version 150.0.0, current version 476.19.0)
>        /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit (compatibility version 45.0.0, current version 949.54.0)
> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices (compatibility version 1.0.0, current version 34.0.0)
> /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation (compatibility version 300.0.0, current version 677.26.0)
> 
> 
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