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CMake/SDL2: add ability to find SDL2 without pkg-config
This commit is contained in:
Michael Pavlyshko
216
cmake_modules/FindSDL2.cmake
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216
cmake_modules/FindSDL2.cmake
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#.rst:
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# FindSDL2
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# --------
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#
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# Locate SDL2 library
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#
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# This module defines
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#
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# ::
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#
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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 SDL
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# SDL2_INCLUDE_DIR, where to find SDL.h
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# SDL2_VERSION_STRING, human-readable string containing the version of SDL
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#
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#
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#
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# This module responds to the flag:
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#
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# ::
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#
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# SDL2_BUILDING_LIBRARY
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# If this is defined, then no SDL2_main 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 proper link flags
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# as part of the returned SDL2_LIBRARY variable.
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#
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#
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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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#
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# Additional Note: If you see an empty SDL2_LIBRARY_TEMP in your
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# configuration and no SDL2_LIBRARY, it means CMake did not find your SDL
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# library (SDL2.dll, libSDL2.so, SDL.framework, etc). Set
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# SDL2_LIBRARY_TEMP to point to your SDL library, and configure again.
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# Similarly, if you see an empty SDL2MAIN_LIBRARY, you should set this
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# value as appropriate. These values are used to generate the final
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# SDL2_LIBRARY variable, but when these values are unset, SDL2_LIBRARY
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# does not get created.
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#
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#
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#
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# $SDL2DIR is an environment variable that would correspond to the
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# ./configure --prefix=$SDL2DIR used in building SDL. l.e.galup 9-20-02
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#
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# Modified by Eric Wing. Added code to assist with automated building
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# by using environmental variables and providing a more
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# controlled/consistent search behavior. Added new modifications to
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# recognize OS X frameworks and additional Unix paths (FreeBSD, etc).
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# Also corrected the header search path to follow "proper" SDL
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# guidelines. Added a search for SDLmain which is needed by some
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# platforms. Added a search for threads which is needed by some
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# platforms. 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 SDL2_LIBRARY to
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# 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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#=============================================================================
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# Copyright 2003-2009 Kitware, Inc.
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# Copyright 2012 Benjamin Eikel
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file kitware license.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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if (NOT WIN32)
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find_package(PkgConfig)
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if (PKG_CONFIG_FOUND)
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pkg_check_modules(_SDL2 sdl2)
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set(SDL2_VERSION_STRING ${_SDL2_VERSION})
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endif ()
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endif ()
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find_path(SDL2_INCLUDE_DIR
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SDL.h
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HINTS
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${_SDL2_INCLUDEDIR}
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ENV SDL2DIR
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PATH_SUFFIXES
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SDL2
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include/SDL2
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include
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)
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if(CMAKE_SIZEOF_VOID_P EQUAL 8)
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set(VC_LIB_PATH_SUFFIX lib/x64)
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else()
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set(VC_LIB_PATH_SUFFIX lib/x86)
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endif()
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find_library(SDL2_LIBRARY_TEMP
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NAMES
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SDL2
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HINTS
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${_SDL2_LIBDIR}
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ENV SDL2DIR
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PATH_SUFFIXES
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lib
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${VC_LIB_PATH_SUFFIX}
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)
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if(NOT SDL2_BUILDING_LIBRARY)
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if(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
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# Non-OS X framework versions expect you to also dynamically link to
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# SDLmain. This is mainly for Windows and OS X. Other (Unix) platforms
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# seem to provide SDLmain for compatibility even though they don't
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# necessarily need it.
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find_library(SDL2MAIN_LIBRARY
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NAMES
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SDL2main
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HINTS
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ENV SDL2DIR
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PATH_SUFFIXES
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lib
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${VC_LIB_PATH_SUFFIX}
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PATHS
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/sw
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/opt/local
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/opt/csw
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/opt
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)
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endif()
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endif()
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# SDL 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()
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# MinGW needs an additional library, mwindows
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# It's total link flags should look like -lmingw32 -lSDLmain -lSDL -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()
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if(SDL2_LIBRARY_TEMP)
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# For SDLmain
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if(SDL2MAIN_LIBRARY AND NOT SDL2_BUILDING_LIBRARY)
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list(FIND SDL2_LIBRARY_TEMP "${SDL2MAIN_LIBRARY}" _SDL2_MAIN_INDEX)
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if(_SDL2_MAIN_INDEX EQUAL -1)
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set(SDL2_LIBRARY_TEMP "${SDL2MAIN_LIBRARY}" ${SDL2_LIBRARY_TEMP})
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endif()
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unset(_SDL2_MAIN_INDEX)
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endif()
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# For OS X, SDL 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()
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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()
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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()
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# Set the final string here so the GUI reflects the final state.
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set(SDL2_LIBRARY ${SDL2_LIBRARY_TEMP} CACHE STRING "Where the SDL Library can be found")
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# Set the temp variable to INTERNAL so it is not seen in the CMake GUI
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set(SDL2_LIBRARY_TEMP "${SDL2_LIBRARY_TEMP}" CACHE INTERNAL "")
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endif()
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if(SDL2_INCLUDE_DIR AND EXISTS "${SDL2_INCLUDE_DIR}/SDL_version.h" AND NOT SDL2_VERSION_STRING)
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file(STRINGS "${SDL2_INCLUDE_DIR}/SDL_version.h" SDL2_VERSION_MAJOR_LINE REGEX "^#define[ \t]+SDL_MAJOR_VERSION[ \t]+[0-9]+$")
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file(STRINGS "${SDL2_INCLUDE_DIR}/SDL_version.h" SDL2_VERSION_MINOR_LINE REGEX "^#define[ \t]+SDL_MINOR_VERSION[ \t]+[0-9]+$")
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file(STRINGS "${SDL2_INCLUDE_DIR}/SDL_version.h" SDL2_VERSION_PATCH_LINE REGEX "^#define[ \t]+SDL_PATCHLEVEL[ \t]+[0-9]+$")
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string(REGEX REPLACE "^#define[ \t]+SDL_MAJOR_VERSION[ \t]+([0-9]+)$" "\\1" SDL2_VERSION_MAJOR "${SDL2_VERSION_MAJOR_LINE}")
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string(REGEX REPLACE "^#define[ \t]+SDL_MINOR_VERSION[ \t]+([0-9]+)$" "\\1" SDL2_VERSION_MINOR "${SDL2_VERSION_MINOR_LINE}")
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string(REGEX REPLACE "^#define[ \t]+SDL_PATCHLEVEL[ \t]+([0-9]+)$" "\\1" SDL2_VERSION_PATCH "${SDL2_VERSION_PATCH_LINE}")
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set(SDL2_VERSION_STRING ${SDL2_VERSION_MAJOR}.${SDL2_VERSION_MINOR}.${SDL2_VERSION_PATCH})
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unset(SDL2_VERSION_MAJOR_LINE)
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unset(SDL2_VERSION_MINOR_LINE)
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unset(SDL2_VERSION_PATCH_LINE)
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unset(SDL2_VERSION_MAJOR)
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unset(SDL2_VERSION_MINOR)
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unset(SDL2_VERSION_PATCH)
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endif()
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set(SDL2_LIBRARIES ${SDL2_LIBRARY})
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set(SDL2_INCLUDE_DIRS ${SDL2_INCLUDE_DIR})
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include(FindPackageHandleStandardArgs)
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FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2
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REQUIRED_VARS SDL2_LIBRARY SDL2_INCLUDE_DIR
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VERSION_VAR SDL2_VERSION_STRING)
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