[CMake] SDL troubles on Mac OS X

[Werner Smekal]

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)