191 lines
7.1 KiB
CMake
191 lines
7.1 KiB
CMake
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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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#[=======================================================================[.rst:
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FindSDL
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-------
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Locate SDL library
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This module defines
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::
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SDL_LIBRARY, the name of the library to link against
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SDL_FOUND, if false, do not try to link to SDL
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SDL_INCLUDE_DIR, where to find SDL.h
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SDL_VERSION_STRING, human-readable string containing the version of SDL
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This module responds to the flag:
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::
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SDL_BUILDING_LIBRARY
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If this is defined, then no SDL_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 SDL_LIBRARY variable.
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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 -lSDLmain 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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Additional Note: If you see an empty SDL_LIBRARY_TEMP in your
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configuration and no SDL_LIBRARY, it means CMake did not find your SDL
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library (SDL.dll, libsdl.so, SDL.framework, etc). Set
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SDL_LIBRARY_TEMP to point to your SDL library, and configure again.
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Similarly, if you see an empty SDLMAIN_LIBRARY, you should set this
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value as appropriate. These values are used to generate the final
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SDL_LIBRARY variable, but when these values are unset, SDL_LIBRARY
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does not get created.
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$SDLDIR is an environment variable that would correspond to the
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./configure --prefix=$SDLDIR used in building SDL. l.e.galup 9-20-02
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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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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 SDL_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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Note that the header path has changed from SDL/SDL.h to just SDL.h
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This needed to change because "proper" SDL convention is #include
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"SDL.h", not <SDL/SDL.h>. This is done for portability reasons
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because not all systems place things in SDL/ (see FreeBSD).
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#]=======================================================================]
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find_path(SDL_INCLUDE_DIR SDL.h
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HINTS
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ENV SDLDIR
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PATH_SUFFIXES SDL SDL12 SDL11
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# path suffixes to search inside ENV{SDLDIR}
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include/SDL include/SDL12 include/SDL11 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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# SDL-1.1 is the name used by FreeBSD ports...
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# don't confuse it for the version number.
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find_library(SDL_LIBRARY_TEMP
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NAMES SDL SDL-1.1
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HINTS
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ENV SDLDIR
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PATH_SUFFIXES lib ${VC_LIB_PATH_SUFFIX}
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)
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# Hide this cache variable from the user, it's an internal implementation
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# detail. The documented library variable for the user is SDL_LIBRARY
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# which is derived from SDL_LIBRARY_TEMP further below.
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set_property(CACHE SDL_LIBRARY_TEMP PROPERTY TYPE INTERNAL)
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if(NOT SDL_BUILDING_LIBRARY)
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if(NOT SDL_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(SDLMAIN_LIBRARY
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NAMES SDLmain SDLmain-1.1
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HINTS
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ENV SDLDIR
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PATH_SUFFIXES lib ${VC_LIB_PATH_SUFFIX}
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PATHS
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/opt
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)
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endif()
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endif()
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# SDL may require threads on your system.
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# The Apple build may not need an explicit flag because one of the
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# frameworks may already provide it.
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# But for non-OSX systems, I will use the CMake Threads package.
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if(NOT APPLE)
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find_package(Threads)
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endif()
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# MinGW needs an additional link flag, -mwindows
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# It's total link flags should look like -lmingw32 -lSDLmain -lSDL -mwindows
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if(MINGW)
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set(MINGW32_LIBRARY mingw32 "-mwindows" CACHE STRING "link flags for MinGW")
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endif()
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if(SDL_LIBRARY_TEMP)
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# For SDLmain
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if(SDLMAIN_LIBRARY AND NOT SDL_BUILDING_LIBRARY)
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list(FIND SDL_LIBRARY_TEMP "${SDLMAIN_LIBRARY}" _SDL_MAIN_INDEX)
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if(_SDL_MAIN_INDEX EQUAL -1)
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set(SDL_LIBRARY_TEMP "${SDLMAIN_LIBRARY}" ${SDL_LIBRARY_TEMP})
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endif()
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unset(_SDL_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(SDL_LIBRARY_TEMP ${SDL_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(SDL_LIBRARY_TEMP ${SDL_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(SDL_LIBRARY_TEMP ${MINGW32_LIBRARY} ${SDL_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(SDL_LIBRARY ${SDL_LIBRARY_TEMP} CACHE STRING "Where the SDL Library can be found")
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endif()
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if(SDL_INCLUDE_DIR AND EXISTS "${SDL_INCLUDE_DIR}/SDL_version.h")
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file(STRINGS "${SDL_INCLUDE_DIR}/SDL_version.h" SDL_VERSION_MAJOR_LINE REGEX "^#define[ \t]+SDL_MAJOR_VERSION[ \t]+[0-9]+$")
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file(STRINGS "${SDL_INCLUDE_DIR}/SDL_version.h" SDL_VERSION_MINOR_LINE REGEX "^#define[ \t]+SDL_MINOR_VERSION[ \t]+[0-9]+$")
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file(STRINGS "${SDL_INCLUDE_DIR}/SDL_version.h" SDL_VERSION_PATCH_LINE REGEX "^#define[ \t]+SDL_PATCHLEVEL[ \t]+[0-9]+$")
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string(REGEX REPLACE "^#define[ \t]+SDL_MAJOR_VERSION[ \t]+([0-9]+)$" "\\1" SDL_VERSION_MAJOR "${SDL_VERSION_MAJOR_LINE}")
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string(REGEX REPLACE "^#define[ \t]+SDL_MINOR_VERSION[ \t]+([0-9]+)$" "\\1" SDL_VERSION_MINOR "${SDL_VERSION_MINOR_LINE}")
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string(REGEX REPLACE "^#define[ \t]+SDL_PATCHLEVEL[ \t]+([0-9]+)$" "\\1" SDL_VERSION_PATCH "${SDL_VERSION_PATCH_LINE}")
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set(SDL_VERSION_STRING ${SDL_VERSION_MAJOR}.${SDL_VERSION_MINOR}.${SDL_VERSION_PATCH})
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unset(SDL_VERSION_MAJOR_LINE)
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unset(SDL_VERSION_MINOR_LINE)
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unset(SDL_VERSION_PATCH_LINE)
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unset(SDL_VERSION_MAJOR)
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unset(SDL_VERSION_MINOR)
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unset(SDL_VERSION_PATCH)
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endif()
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include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
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FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL
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REQUIRED_VARS SDL_LIBRARY SDL_INCLUDE_DIR
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VERSION_VAR SDL_VERSION_STRING)
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