cmake_modules/FindSDL2.cmake
branch1.0.0
changeset 15882 acfa0869b579
parent 15881 7b1d6dfa3173
child 15883 9d4ba1912e71
equal deleted inserted replaced
15881:7b1d6dfa3173 15882:acfa0869b579
     1 # Locate SDL2 library
       
     2 # This module defines
       
     3 # SDL2_LIBRARY, the name of the library to link against
       
     4 # SDL2_FOUND, if false, do not try to link to SDL2
       
     5 # SDL2_INCLUDE_DIR, where to find SDL.h
       
     6 #
       
     7 # This module responds to the the flag:
       
     8 # SDL2_BUILDING_LIBRARY
       
     9 # If this is defined, then no SDL2main will be linked in because
       
    10 # only applications need main().
       
    11 # Otherwise, it is assumed you are building an application and this
       
    12 # module will attempt to locate and set the the proper link flags
       
    13 # as part of the returned SDL2_LIBRARY variable.
       
    14 #
       
    15 # Don't forget to include SDLmain.h and SDLmain.m your project for the
       
    16 # OS X framework based version. (Other versions link to -lSDL2main which
       
    17 # this module will try to find on your behalf.) Also for OS X, this
       
    18 # module will automatically add the -framework Cocoa on your behalf.
       
    19 #
       
    20 #
       
    21 # Additional Note: If you see an empty SDL2_LIBRARY_TEMP in your configuration
       
    22 # and no SDL2_LIBRARY, it means CMake did not find your SDL2 library
       
    23 # (SDL2.dll, libsdl2.so, SDL2.framework, etc).
       
    24 # Set SDL2_LIBRARY_TEMP to point to your SDL2 library, and configure again.
       
    25 # Similarly, if you see an empty SDL2MAIN_LIBRARY, you should set this value
       
    26 # as appropriate. These values are used to generate the final SDL2_LIBRARY
       
    27 # variable, but when these values are unset, SDL2_LIBRARY does not get created.
       
    28 #
       
    29 #
       
    30 # $SDL2DIR is an environment variable that would
       
    31 # correspond to the ./configure --prefix=$SDL2DIR
       
    32 # used in building SDL2.
       
    33 # l.e.galup  9-20-02
       
    34 #
       
    35 # Modified by Eric Wing.
       
    36 # Added code to assist with automated building by using environmental variables
       
    37 # and providing a more controlled/consistent search behavior.
       
    38 # Added new modifications to recognize OS X frameworks and
       
    39 # additional Unix paths (FreeBSD, etc).
       
    40 # Also corrected the header search path to follow "proper" SDL guidelines.
       
    41 # Added a search for SDL2main which is needed by some platforms.
       
    42 # Added a search for threads which is needed by some platforms.
       
    43 # Added needed compile switches for MinGW.
       
    44 #
       
    45 # On OSX, this will prefer the Framework version (if found) over others.
       
    46 # People will have to manually change the cache values of
       
    47 # SDL2_LIBRARY to override this selection or set the CMake environment
       
    48 # CMAKE_INCLUDE_PATH to modify the search paths.
       
    49 #
       
    50 # Note that the header path has changed from SDL2/SDL.h to just SDL.h
       
    51 # This needed to change because "proper" SDL convention
       
    52 # is #include "SDL.h", not <SDL2/SDL.h>. This is done for portability
       
    53 # reasons because not all systems place things in SDL2/ (see FreeBSD).
       
    54 
       
    55 #=============================================================================
       
    56 # Copyright 2003-2009 Kitware, Inc.
       
    57 #
       
    58 # Distributed under the OSI-approved BSD License (the "License");
       
    59 # see accompanying file Copyright.txt for details.
       
    60 #
       
    61 # This software is distributed WITHOUT ANY WARRANTY; without even the
       
    62 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
       
    63 # See the License for more information.
       
    64 #=============================================================================
       
    65 # (To distribute this file outside of CMake, substitute the full
       
    66 #  License text for the above reference.)
       
    67 
       
    68 SET(SDL2_SEARCH_PATHS
       
    69     ~/Library/Frameworks
       
    70     /Library/Frameworks
       
    71     /usr/local
       
    72     /usr
       
    73     /sw # Fink
       
    74     /opt/local # DarwinPorts
       
    75     /opt/csw # Blastwave
       
    76     /opt
       
    77 )
       
    78 
       
    79 FIND_PATH(SDL2_INCLUDE_DIR SDL.h
       
    80     HINTS
       
    81     $ENV{SDL2DIR}
       
    82     PATH_SUFFIXES include/SDL2 include
       
    83     PATHS ${SDL2_SEARCH_PATHS}
       
    84 )
       
    85 
       
    86 FIND_LIBRARY(SDL2_LIBRARY_TEMP
       
    87     NAMES SDL2
       
    88     HINTS
       
    89     $ENV{SDL2DIR}
       
    90     PATH_SUFFIXES lib64 lib
       
    91     PATHS ${SDL2_SEARCH_PATHS}
       
    92 )
       
    93 
       
    94 IF(NOT SDL2_BUILDING_LIBRARY)
       
    95     IF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
       
    96         # Non-OS X framework versions expect you to also dynamically link to
       
    97         # SDL2main. This is mainly for Windows and OS X. Other (Unix) platforms
       
    98         # seem to provide SDL2main for compatibility even though they don't
       
    99         # necessarily need it.
       
   100         FIND_LIBRARY(SDL2MAIN_LIBRARY
       
   101             NAMES SDL2main
       
   102             HINTS
       
   103             $ENV{SDL2DIR}
       
   104             PATH_SUFFIXES lib64 lib
       
   105             PATHS ${SDL2_SEARCH_PATHS}
       
   106         )
       
   107     ENDIF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
       
   108 ENDIF(NOT SDL2_BUILDING_LIBRARY)
       
   109 
       
   110 # SDL2 may require threads on your system.
       
   111 # The Apple build may not need an explicit flag because one of the
       
   112 # frameworks may already provide it.
       
   113 # But for non-OSX systems, I will use the CMake Threads package.
       
   114 IF(NOT APPLE)
       
   115     FIND_PACKAGE(Threads)
       
   116 ENDIF(NOT APPLE)
       
   117 
       
   118 # MinGW needs an additional library, mwindows
       
   119 # It's total link flags should look like -lmingw32 -lSDL2main -lSDL2 -lmwindows
       
   120 # (Actually on second look, I think it only needs one of the m* libraries.)
       
   121 IF(MINGW)
       
   122     SET(MINGW32_LIBRARY mingw32 CACHE STRING "mwindows for MinGW")
       
   123 ENDIF(MINGW)
       
   124 
       
   125 IF(SDL2_LIBRARY_TEMP)
       
   126     # For SDL2main
       
   127     IF(NOT SDL2_BUILDING_LIBRARY)
       
   128         IF(SDL2MAIN_LIBRARY)
       
   129             SET(SDL2_LIBRARY_TEMP ${SDL2MAIN_LIBRARY} ${SDL2_LIBRARY_TEMP})
       
   130         ENDIF(SDL2MAIN_LIBRARY)
       
   131     ENDIF(NOT SDL2_BUILDING_LIBRARY)
       
   132 
       
   133     # For OS X, SDL2 uses Cocoa as a backend so it must link to Cocoa.
       
   134     # CMake doesn't display the -framework Cocoa string in the UI even
       
   135     # though it actually is there if I modify a pre-used variable.
       
   136     # I think it has something to do with the CACHE STRING.
       
   137     # So I use a temporary variable until the end so I can set the
       
   138     # "real" variable in one-shot.
       
   139     IF(APPLE)
       
   140         SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} "-framework Cocoa")
       
   141     ENDIF(APPLE)
       
   142 
       
   143     # For threads, as mentioned Apple doesn't need this.
       
   144     # In fact, there seems to be a problem if I used the Threads package
       
   145     # and try using this line, so I'm just skipping it entirely for OS X.
       
   146     IF(NOT APPLE)
       
   147         SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} ${CMAKE_THREAD_LIBS_INIT})
       
   148     ENDIF(NOT APPLE)
       
   149 
       
   150     # For MinGW library
       
   151     IF(MINGW)
       
   152         SET(SDL2_LIBRARY_TEMP ${MINGW32_LIBRARY} ${SDL2_LIBRARY_TEMP})
       
   153     ENDIF(MINGW)
       
   154 
       
   155     # Set the final string here so the GUI reflects the final state.
       
   156     SET(SDL2_LIBRARY ${SDL2_LIBRARY_TEMP} CACHE STRING "Where the SDL2 Library can be found")
       
   157     # Set the temp variable to INTERNAL so it is not seen in the CMake GUI
       
   158     SET(SDL2_LIBRARY_TEMP "${SDL2_LIBRARY_TEMP}" CACHE INTERNAL "")
       
   159 ENDIF(SDL2_LIBRARY_TEMP)
       
   160 
       
   161 if(BUILD_ENGINE_JS)
       
   162     set(SDL2_LIBRARY "sdl2_emscripten_internal" CACHE STRING "emscripten override" FORCE)
       
   163     set(SDL2_INCLUDE_DIR "${CMAKE_SYSTEM_INCLUDE_PATH}/SDL" CACHE STRING "emscripten override" FORCE)
       
   164 endif()
       
   165 
       
   166 INCLUDE(FindPackageHandleStandardArgs)
       
   167 
       
   168 FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2 REQUIRED_VARS SDL2_LIBRARY SDL2_INCLUDE_DIR)
       
   169