227 lines
9.1 KiB
CMake
227 lines
9.1 KiB
CMake
# 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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# If you have pkg-config, these extra variables are also defined:
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# SDL2_DEFINITIONS, extra CFLAGS
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# SDL2_EXTRA_LIBS, extra link libs
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# SDL2_LINKER_FLAGS, extra link flags
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#
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# The latter two are automatically added to SDL2_LIBRARY
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#
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# To use them, add code such as:
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#
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# # SET(SDL2_STATIC ON) # if you want to link SDL2 statically
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# FIND_PACKAGE(SDL2 REQUIRED)
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# ADD_DEFINITIONS(${SDL2_DEFINITIONS})
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# TARGET_LINK_LIBRARIES(your-executable-target ${SDL2_LIBRARY} ...)
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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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# If you want to link SDL2 statically, set SDL2_STATIC to ON.
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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 SDL3/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 # Mac Homebrew and local installs
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/usr
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/sw # Fink
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/opt/local # MacPorts
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/opt/csw # OpenCSW (Solaris)
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/opt
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${SDL2_PATH}/include
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${SDL2_PATH}/lib
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)
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FIND_PATH(SDL2_INCLUDE_DIR SDL.h
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HINTS $ENV{SDL2DIR}
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PATH_SUFFIXES SDL2
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PATHS ${SDL2_SEARCH_PATHS}
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)
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SET(CURRENT_FIND_LIBRARY_SUFFIXES ${CMAKE_FIND_LIBRARY_SUFFIXES})
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IF(SDL2_STATIC)
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IF(WIN32)
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SET(CMAKE_FIND_LIBRARY_SUFFIXES .lib .a)
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ELSE(WIN32)
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SET(CMAKE_FIND_LIBRARY_SUFFIXES .a)
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ENDIF(WIN32)
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ENDIF(SDL2_STATIC)
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FIND_LIBRARY(SDL2_LIBRARY_TEMP
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NAMES SDL2
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HINTS $ENV{SDL2DIR}
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PATH_SUFFIXES lib64 lib lib/x64 lib/x86
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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 lib/x64 lib/x86
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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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SET(CMAKE_FIND_LIBRARY_SUFFIXES ${CURRENT_FIND_LIBRARY_SUFFIXES})
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UNSET(CURRENT_FIND_LIBRARY_SUFFIXES)
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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 link flag, -mwindows (to make a GUI app)
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# but we only add it when not making a Debug build.
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# It's total link flags should look like -lmingw32 -lSDL2main -lSDL2 -mwindows
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IF(MINGW)
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SET(MINGW32_LIBRARY -lmingw32 CACHE STRING "MinGW library")
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IF(NOT CMAKE_BUILD_TYPE STREQUAL Debug)
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SET(MINGW32_LIBRARY ${MINGW32_LIBRARY} -mwindows)
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ENDIF()
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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} -lversion -limm32)
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ENDIF(MINGW)
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# Add some stuff from pkg-config, if available
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IF(NOT PKG_CONFIG_EXECUTABLE)
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FIND_PACKAGE(PkgConfig QUIET)
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ENDIF(NOT PKG_CONFIG_EXECUTABLE)
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IF(PKG_CONFIG_EXECUTABLE)
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# get any definitions
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EXECUTE_PROCESS(COMMAND ${PKG_CONFIG_EXECUTABLE} --cflags-only-other sdl2 OUTPUT_VARIABLE SDL2_DEFINITIONS ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
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SET(SDL2_DEFINITIONS ${SDL2_DEFINITIONS} CACHE STRING "Extra CFLAGS for SDL2 from pkg-config")
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# get any extra stuff needed for linking
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IF(NOT SDL2_STATIC)
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EXECUTE_PROCESS(COMMAND ${PKG_CONFIG_EXECUTABLE} --libs-only-other sdl2 OUTPUT_VARIABLE SDL2_LINKER_FLAGS_RAW ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
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EXECUTE_PROCESS(COMMAND ${PKG_CONFIG_EXECUTABLE} --libs-only-l sdl2 OUTPUT_VARIABLE SDL2_EXTRA_LIBS_RAW ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
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ELSE(NOT SDL2_STATIC)
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EXECUTE_PROCESS(COMMAND ${PKG_CONFIG_EXECUTABLE} --static --libs-only-other sdl2 OUTPUT_VARIABLE SDL2_LINKER_FLAGS_RAW ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
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EXECUTE_PROCESS(COMMAND ${PKG_CONFIG_EXECUTABLE} --static --libs-only-l sdl2 OUTPUT_VARIABLE SDL2_EXTRA_LIBS_RAW ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
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ENDIF(NOT SDL2_STATIC)
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STRING(REGEX REPLACE "[^ ]+SDL2[^ ]*" "" SDL2_EXTRA_LIBS_RAW2 "${SDL2_EXTRA_LIBS_RAW}")
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STRING(REGEX REPLACE " +" ";" SDL2_EXTRA_LIBS "${SDL2_EXTRA_LIBS_RAW2}")
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STRING(REGEX REPLACE " +" ";" SDL2_LINKER_FLAGS "${SDL2_LINKER_FLAGS_RAW}")
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SET(SDL2_LINKER_FLAGS ${SDL2_LINKER_FLAGS} CACHE STRING "Linker flags for linking SDL2")
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SET(SDL2_EXTRA_LIBS ${SDL2_EXTRA_LIBS} CACHE STRING "Extra libraries for linking SDL2")
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SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} ${SDL2_EXTRA_LIBS} ${SDL2_LINKER_FLAGS})
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ENDIF(PKG_CONFIG_EXECUTABLE)
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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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INCLUDE(FindPackageHandleStandardArgs)
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FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2 REQUIRED_VARS SDL2_LIBRARY SDL2_INCLUDE_DIR)
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