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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-e6b18d33e121pull/1/head
Matthias Melcher
9 years ago
36 changed files with 399 additions and 14 deletions
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# This module defines |
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# SDL2_LIBRARY, the name of the library to link against |
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# SDL2_FOUND, if false, do not try to link to SDL2 |
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# SDL2_INCLUDE_DIR, where to find SDL.h |
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# |
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# This module responds to the the flag: |
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# SDL2_BUILDING_LIBRARY |
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# If this is defined, then no SDL2main will be linked in because |
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# only applications need main(). |
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# Otherwise, it is assumed you are building an application and this |
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# module will attempt to locate and set the the proper link flags |
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# as part of the returned SDL2_LIBRARY variable. |
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# |
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# Don't forget to include SDLmain.h and SDLmain.m your project for the |
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# OS X framework based version. (Other versions link to -lSDL2main which |
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# this module will try to find on your behalf.) Also for OS X, this |
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# module will automatically add the -framework Cocoa on your behalf. |
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# |
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# |
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# Additional Note: If you see an empty SDL2_LIBRARY_TEMP in your configuration |
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# and no SDL2_LIBRARY, it means CMake did not find your SDL2 library |
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# (SDL2.dll, libsdl2.so, SDL2.framework, etc). |
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# Set SDL2_LIBRARY_TEMP to point to your SDL2 library, and configure again. |
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# Similarly, if you see an empty SDL2MAIN_LIBRARY, you should set this value |
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# as appropriate. These values are used to generate the final SDL2_LIBRARY |
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# variable, but when these values are unset, SDL2_LIBRARY does not get created. |
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# |
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# |
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# $SDL2DIR is an environment variable that would |
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# correspond to the ./configure --prefix=$SDL2DIR |
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# used in building SDL2. |
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# l.e.galup 9-20-02 |
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# |
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# Modified by Eric Wing. |
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# Added code to assist with automated building by using environmental variables |
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# and providing a more controlled/consistent search behavior. |
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# Added new modifications to recognize OS X frameworks and |
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# additional Unix paths (FreeBSD, etc). |
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# Also corrected the header search path to follow "proper" SDL guidelines. |
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# Added a search for SDL2main which is needed by some platforms. |
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# Added a search for threads which is needed by some platforms. |
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# Added needed compile switches for MinGW. |
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# |
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# On OSX, this will prefer the Framework version (if found) over others. |
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# People will have to manually change the cache values of |
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# SDL2_LIBRARY to override this selection or set the CMake environment |
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# CMAKE_INCLUDE_PATH to modify the search paths. |
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# |
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# Note that the header path has changed from SDL2/SDL.h to just SDL.h |
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# This needed to change because "proper" SDL convention |
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# is #include "SDL.h", not <SDL2/SDL.h>. This is done for portability |
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# reasons because not all systems place things in SDL2/ (see FreeBSD). |
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#============================================================================= |
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# Copyright 2003-2009 Kitware, Inc. |
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# |
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# Distributed under the OSI-approved BSD License (the "License"); |
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# see accompanying file Copyright.txt for details. |
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# |
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# This software is distributed WITHOUT ANY WARRANTY; without even the |
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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# See the License for more information. |
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#============================================================================= |
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# (To distribute this file outside of CMake, substitute the full |
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# License text for the above reference.) |
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message("<FindSDL2.cmake>") |
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SET(SDL2_SEARCH_PATHS |
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~/Library/Frameworks |
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/Library/Frameworks |
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/usr/local |
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/usr |
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/sw # Fink |
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/opt/local # DarwinPorts |
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/opt/csw # Blastwave |
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/opt |
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${SDL2_PATH} |
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) |
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FIND_PATH(SDL2_INCLUDE_DIR SDL.h |
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HINTS |
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$ENV{SDL2DIR} |
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PATH_SUFFIXES include/SDL2 include |
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PATHS ${SDL2_SEARCH_PATHS} |
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) |
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FIND_LIBRARY(SDL2_LIBRARY_TEMP |
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NAMES SDL2 |
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HINTS |
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$ENV{SDL2DIR} |
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PATH_SUFFIXES lib64 lib |
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PATHS ${SDL2_SEARCH_PATHS} |
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) |
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IF(NOT SDL2_BUILDING_LIBRARY) |
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IF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework") |
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# Non-OS X framework versions expect you to also dynamically link to |
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# SDL2main. This is mainly for Windows and OS X. Other (Unix) platforms |
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# seem to provide SDL2main for compatibility even though they don't |
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# necessarily need it. |
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FIND_LIBRARY(SDL2MAIN_LIBRARY |
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NAMES SDL2main |
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HINTS |
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$ENV{SDL2DIR} |
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PATH_SUFFIXES lib64 lib |
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PATHS ${SDL2_SEARCH_PATHS} |
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) |
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ENDIF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework") |
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ENDIF(NOT SDL2_BUILDING_LIBRARY) |
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# SDL2 may require threads on your system. |
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# The Apple build may not need an explicit flag because one of the |
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# frameworks may already provide it. |
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# But for non-OSX systems, I will use the CMake Threads package. |
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IF(NOT APPLE) |
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FIND_PACKAGE(Threads) |
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ENDIF(NOT APPLE) |
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# MinGW needs an additional library, mwindows |
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# It's total link flags should look like -lmingw32 -lSDL2main -lSDL2 -lmwindows |
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# (Actually on second look, I think it only needs one of the m* libraries.) |
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IF(MINGW) |
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SET(MINGW32_LIBRARY mingw32 CACHE STRING "mwindows for MinGW") |
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ENDIF(MINGW) |
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IF(SDL2_LIBRARY_TEMP) |
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# For SDL2main |
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IF(NOT SDL2_BUILDING_LIBRARY) |
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IF(SDL2MAIN_LIBRARY) |
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SET(SDL2_LIBRARY_TEMP ${SDL2MAIN_LIBRARY} ${SDL2_LIBRARY_TEMP}) |
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ENDIF(SDL2MAIN_LIBRARY) |
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ENDIF(NOT SDL2_BUILDING_LIBRARY) |
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# For OS X, SDL2 uses Cocoa as a backend so it must link to Cocoa. |
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# CMake doesn't display the -framework Cocoa string in the UI even |
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# though it actually is there if I modify a pre-used variable. |
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# I think it has something to do with the CACHE STRING. |
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# So I use a temporary variable until the end so I can set the |
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# "real" variable in one-shot. |
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IF(APPLE) |
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SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} "-framework Cocoa") |
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ENDIF(APPLE) |
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# For threads, as mentioned Apple doesn't need this. |
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# In fact, there seems to be a problem if I used the Threads package |
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# and try using this line, so I'm just skipping it entirely for OS X. |
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IF(NOT APPLE) |
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SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} ${CMAKE_THREAD_LIBS_INIT}) |
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ENDIF(NOT APPLE) |
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# For MinGW library |
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IF(MINGW) |
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SET(SDL2_LIBRARY_TEMP ${MINGW32_LIBRARY} ${SDL2_LIBRARY_TEMP}) |
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ENDIF(MINGW) |
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# Set the final string here so the GUI reflects the final state. |
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SET(SDL2_LIBRARY ${SDL2_LIBRARY_TEMP} CACHE STRING "Where the SDL2 Library can be found") |
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# Set the temp variable to INTERNAL so it is not seen in the CMake GUI |
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SET(SDL2_LIBRARY_TEMP "${SDL2_LIBRARY_TEMP}" CACHE INTERNAL "") |
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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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