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Add support for SDL as a base library on OS X.
This commit adds the basic setup in CMake to allow SDL as a base library for FLTK on OS X (and probably for other platforms as well). The SDL library driver set is derived from yet another new driver set named 'Pico'. 'Pico' is a base class for a driver that will allow porting of FLTK with the tinyest amount of effort. This implementation of the SDL driver shall be documented very well to explain the porting process. git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11262 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
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Matthias Melcher
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Mar 2, 2016
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| # This module defines | ||
| # SDL2_LIBRARY, the name of the library to link against | ||
| # SDL2_FOUND, if false, do not try to link to SDL2 | ||
| # SDL2_INCLUDE_DIR, where to find SDL.h | ||
| # | ||
| # This module responds to the the flag: | ||
| # SDL2_BUILDING_LIBRARY | ||
| # If this is defined, then no SDL2main will be linked in because | ||
| # only applications need main(). | ||
| # Otherwise, it is assumed you are building an application and this | ||
| # module will attempt to locate and set the the proper link flags | ||
| # as part of the returned SDL2_LIBRARY variable. | ||
| # | ||
| # Don't forget to include SDLmain.h and SDLmain.m your project for the | ||
| # OS X framework based version. (Other versions link to -lSDL2main which | ||
| # this module will try to find on your behalf.) Also for OS X, this | ||
| # module will automatically add the -framework Cocoa on your behalf. | ||
| # | ||
| # | ||
| # Additional Note: If you see an empty SDL2_LIBRARY_TEMP in your configuration | ||
| # and no SDL2_LIBRARY, it means CMake did not find your SDL2 library | ||
| # (SDL2.dll, libsdl2.so, SDL2.framework, etc). | ||
| # Set SDL2_LIBRARY_TEMP to point to your SDL2 library, and configure again. | ||
| # Similarly, if you see an empty SDL2MAIN_LIBRARY, you should set this value | ||
| # as appropriate. These values are used to generate the final SDL2_LIBRARY | ||
| # variable, but when these values are unset, SDL2_LIBRARY does not get created. | ||
| # | ||
| # | ||
| # $SDL2DIR is an environment variable that would | ||
| # correspond to the ./configure --prefix=$SDL2DIR | ||
| # used in building SDL2. | ||
| # l.e.galup 9-20-02 | ||
| # | ||
| # Modified by Eric Wing. | ||
| # Added code to assist with automated building by using environmental variables | ||
| # and providing a more controlled/consistent search behavior. | ||
| # Added new modifications to recognize OS X frameworks and | ||
| # additional Unix paths (FreeBSD, etc). | ||
| # Also corrected the header search path to follow "proper" SDL guidelines. | ||
| # Added a search for SDL2main which is needed by some platforms. | ||
| # Added a search for threads which is needed by some platforms. | ||
| # Added needed compile switches for MinGW. | ||
| # | ||
| # On OSX, this will prefer the Framework version (if found) over others. | ||
| # People will have to manually change the cache values of | ||
| # SDL2_LIBRARY to override this selection or set the CMake environment | ||
| # CMAKE_INCLUDE_PATH to modify the search paths. | ||
| # | ||
| # Note that the header path has changed from SDL2/SDL.h to just SDL.h | ||
| # This needed to change because "proper" SDL convention | ||
| # is #include "SDL.h", not <SDL2/SDL.h>. This is done for portability | ||
| # reasons because not all systems place things in SDL2/ (see FreeBSD). | ||
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| #============================================================================= | ||
| # Copyright 2003-2009 Kitware, Inc. | ||
| # | ||
| # Distributed under the OSI-approved BSD License (the "License"); | ||
| # see accompanying file Copyright.txt for details. | ||
| # | ||
| # This software is distributed WITHOUT ANY WARRANTY; without even the | ||
| # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | ||
| # See the License for more information. | ||
| #============================================================================= | ||
| # (To distribute this file outside of CMake, substitute the full | ||
| # License text for the above reference.) | ||
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| message("<FindSDL2.cmake>") | ||
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| SET(SDL2_SEARCH_PATHS | ||
| ~/Library/Frameworks | ||
| /Library/Frameworks | ||
| /usr/local | ||
| /usr | ||
| /sw # Fink | ||
| /opt/local # DarwinPorts | ||
| /opt/csw # Blastwave | ||
| /opt | ||
| ${SDL2_PATH} | ||
| ) | ||
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| FIND_PATH(SDL2_INCLUDE_DIR SDL.h | ||
| HINTS | ||
| $ENV{SDL2DIR} | ||
| PATH_SUFFIXES include/SDL2 include | ||
| PATHS ${SDL2_SEARCH_PATHS} | ||
| ) | ||
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| FIND_LIBRARY(SDL2_LIBRARY_TEMP | ||
| NAMES SDL2 | ||
| HINTS | ||
| $ENV{SDL2DIR} | ||
| PATH_SUFFIXES lib64 lib | ||
| PATHS ${SDL2_SEARCH_PATHS} | ||
| ) | ||
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| IF(NOT SDL2_BUILDING_LIBRARY) | ||
| IF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework") | ||
| # Non-OS X framework versions expect you to also dynamically link to | ||
| # SDL2main. This is mainly for Windows and OS X. Other (Unix) platforms | ||
| # seem to provide SDL2main for compatibility even though they don't | ||
| # necessarily need it. | ||
| FIND_LIBRARY(SDL2MAIN_LIBRARY | ||
| NAMES SDL2main | ||
| HINTS | ||
| $ENV{SDL2DIR} | ||
| PATH_SUFFIXES lib64 lib | ||
| PATHS ${SDL2_SEARCH_PATHS} | ||
| ) | ||
| ENDIF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework") | ||
| ENDIF(NOT SDL2_BUILDING_LIBRARY) | ||
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| # SDL2 may require threads on your system. | ||
| # The Apple build may not need an explicit flag because one of the | ||
| # frameworks may already provide it. | ||
| # But for non-OSX systems, I will use the CMake Threads package. | ||
| IF(NOT APPLE) | ||
| FIND_PACKAGE(Threads) | ||
| ENDIF(NOT APPLE) | ||
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| # MinGW needs an additional library, mwindows | ||
| # It's total link flags should look like -lmingw32 -lSDL2main -lSDL2 -lmwindows | ||
| # (Actually on second look, I think it only needs one of the m* libraries.) | ||
| IF(MINGW) | ||
| SET(MINGW32_LIBRARY mingw32 CACHE STRING "mwindows for MinGW") | ||
| ENDIF(MINGW) | ||
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| IF(SDL2_LIBRARY_TEMP) | ||
| # For SDL2main | ||
| IF(NOT SDL2_BUILDING_LIBRARY) | ||
| IF(SDL2MAIN_LIBRARY) | ||
| SET(SDL2_LIBRARY_TEMP ${SDL2MAIN_LIBRARY} ${SDL2_LIBRARY_TEMP}) | ||
| ENDIF(SDL2MAIN_LIBRARY) | ||
| ENDIF(NOT SDL2_BUILDING_LIBRARY) | ||
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| # For OS X, SDL2 uses Cocoa as a backend so it must link to Cocoa. | ||
| # CMake doesn't display the -framework Cocoa string in the UI even | ||
| # though it actually is there if I modify a pre-used variable. | ||
| # I think it has something to do with the CACHE STRING. | ||
| # So I use a temporary variable until the end so I can set the | ||
| # "real" variable in one-shot. | ||
| IF(APPLE) | ||
| SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} "-framework Cocoa") | ||
| ENDIF(APPLE) | ||
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| # For threads, as mentioned Apple doesn't need this. | ||
| # In fact, there seems to be a problem if I used the Threads package | ||
| # and try using this line, so I'm just skipping it entirely for OS X. | ||
| IF(NOT APPLE) | ||
| SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} ${CMAKE_THREAD_LIBS_INIT}) | ||
| ENDIF(NOT APPLE) | ||
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| # For MinGW library | ||
| IF(MINGW) | ||
| SET(SDL2_LIBRARY_TEMP ${MINGW32_LIBRARY} ${SDL2_LIBRARY_TEMP}) | ||
| ENDIF(MINGW) | ||
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| # Set the final string here so the GUI reflects the final state. | ||
| SET(SDL2_LIBRARY ${SDL2_LIBRARY_TEMP} CACHE STRING "Where the SDL2 Library can be found") | ||
| # Set the temp variable to INTERNAL so it is not seen in the CMake GUI | ||
| SET(SDL2_LIBRARY_TEMP "${SDL2_LIBRARY_TEMP}" CACHE INTERNAL "") | ||
| ENDIF(SDL2_LIBRARY_TEMP) | ||
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| message("</FindSDL2.cmake>") | ||
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| INCLUDE(FindPackageHandleStandardArgs) | ||
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| FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2 REQUIRED_VARS SDL2_LIBRARY SDL2_INCLUDE_DIR) | ||
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