cmake_modules/FindSDL2.cmake
author alfadur
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# Locate SDL2 library
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# This module defines
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# SDL2_LIBRARIES, 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_LIBRARIES 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_LIBRARIES, 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_LIBRARIES
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# variable, but when these values are unset, SDL2_LIBRARIES 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_LIBRARIES 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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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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)
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FIND_PATH(SDL2_INCLUDE_DIRS 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_DIRS} 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_DIRS} 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_LIBRARIES ${SDL2_LIBRARY_TEMP} CACHE STRING "Where the SDL2 Library can be found")
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    # Set the temp variable to INTERNAL so it is not seen in the CMake GUI
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    SET(SDL2_LIBRARY_TEMP "${SDL2_LIBRARY_TEMP}" CACHE INTERNAL "")
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ENDIF(SDL2_LIBRARY_TEMP)
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if(BUILD_ENGINE_JS)
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    set(SDL2_LIBRARIES "sdl2_emscripten_internal" CACHE STRING "emscripten override" FORCE)
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    set(SDL2_INCLUDE_DIRS "${CMAKE_SYSTEM_INCLUDE_PATH}/SDL" CACHE STRING "emscripten override" FORCE)
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endif()
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INCLUDE(FindPackageHandleStandardArgs)
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FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2 REQUIRED_VARS SDL2_LIBRARIES SDL2_INCLUDE_DIRS)
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