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FindSDL2.cmake 6.9KB

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  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. # Redistribution and use in source and binary forms, with or without
  59. # modification, are permitted provided that the following conditions are met:
  60. #
  61. # 1. Redistributions of source code must retain the above copyright notice, this
  62. # list of conditions and the following disclaimer.
  63. # 2. Redistributions in binary form must reproduce the above copyright notice,
  64. # this list of conditions and the following disclaimer in the documentation
  65. # and/or other materials provided with the distribution.
  66. #
  67. # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  68. # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  69. # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  70. # DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
  71. # ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  72. # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  73. # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  74. # ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  75. # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  76. # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  77. # =============================================================================
  78. SET(SDL2_SEARCH_PATHS
  79. ~/Library/Frameworks
  80. /Library/Frameworks
  81. /usr/local
  82. /usr
  83. /sw # Fink
  84. /opt/local # DarwinPorts
  85. /opt/csw # Blastwave
  86. /opt
  87. )
  88. FIND_PATH(SDL2_INCLUDE_DIR SDL.h
  89. HINTS
  90. $ENV{SDL2DIR}
  91. PATH_SUFFIXES include/SDL2 include
  92. PATHS ${SDL2_SEARCH_PATHS}
  93. )
  94. FIND_LIBRARY(SDL2_LIBRARY_TEMP
  95. NAMES SDL2
  96. HINTS
  97. $ENV{SDL2DIR}
  98. PATH_SUFFIXES lib64 lib
  99. PATHS ${SDL2_SEARCH_PATHS}
  100. )
  101. IF(NOT SDL2_BUILDING_LIBRARY)
  102. IF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
  103. # Non-OS X framework versions expect you to also dynamically link to
  104. # SDL2main. This is mainly for Windows and OS X. Other (Unix) platforms
  105. # seem to provide SDL2main for compatibility even though they don't
  106. # necessarily need it.
  107. FIND_LIBRARY(SDL2MAIN_LIBRARY
  108. NAMES SDL2main
  109. HINTS
  110. $ENV{SDL2DIR}
  111. PATH_SUFFIXES lib64 lib
  112. PATHS ${SDL2_SEARCH_PATHS}
  113. )
  114. ENDIF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
  115. ENDIF(NOT SDL2_BUILDING_LIBRARY)
  116. # SDL2 may require threads on your system.
  117. # The Apple build may not need an explicit flag because one of the
  118. # frameworks may already provide it.
  119. # But for non-OSX systems, I will use the CMake Threads package.
  120. IF(NOT APPLE)
  121. FIND_PACKAGE(Threads)
  122. ENDIF(NOT APPLE)
  123. # MinGW needs an additional library, mwindows
  124. # It's total link flags should look like -lmingw32 -lSDL2main -lSDL2 -lmwindows
  125. # (Actually on second look, I think it only needs one of the m* libraries.)
  126. IF(MINGW)
  127. SET(MINGW32_LIBRARY mingw32 CACHE STRING "mwindows for MinGW")
  128. ENDIF(MINGW)
  129. IF(SDL2_LIBRARY_TEMP)
  130. # For SDL2main
  131. IF(NOT SDL2_BUILDING_LIBRARY)
  132. IF(SDL2MAIN_LIBRARY)
  133. SET(SDL2_LIBRARY_TEMP ${SDL2MAIN_LIBRARY} ${SDL2_LIBRARY_TEMP})
  134. ENDIF(SDL2MAIN_LIBRARY)
  135. ENDIF(NOT SDL2_BUILDING_LIBRARY)
  136. # For OS X, SDL2 uses Cocoa as a backend so it must link to Cocoa.
  137. # CMake doesn't display the -framework Cocoa string in the UI even
  138. # though it actually is there if I modify a pre-used variable.
  139. # I think it has something to do with the CACHE STRING.
  140. # So I use a temporary variable until the end so I can set the
  141. # "real" variable in one-shot.
  142. IF(APPLE)
  143. SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} "-framework Cocoa")
  144. ENDIF(APPLE)
  145. # For threads, as mentioned Apple doesn't need this.
  146. # In fact, there seems to be a problem if I used the Threads package
  147. # and try using this line, so I'm just skipping it entirely for OS X.
  148. IF(NOT APPLE)
  149. SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} ${CMAKE_THREAD_LIBS_INIT})
  150. ENDIF(NOT APPLE)
  151. # For MinGW library
  152. IF(MINGW)
  153. SET(SDL2_LIBRARY_TEMP ${MINGW32_LIBRARY} ${SDL2_LIBRARY_TEMP})
  154. ENDIF(MINGW)
  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. INCLUDE(FindPackageHandleStandardArgs)
  161. FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2 REQUIRED_VARS SDL2_LIBRARY SDL2_INCLUDE_DIR)