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cmake: simplify FindSDL2 + detect SDL2 version
+ allow switching between static and shared SDL2 without complete reconfiguration and rebuild.
This commit is contained in:
Anonymous Maarten
parent
9ea287606d
commit
8efde3a5cb
@ -40,7 +40,7 @@ else()
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endif()
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# Do not link to SDL2main library
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set(SDL2_BUILDING_LIBRARY True)
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set(SDL2_BUILDING_LIBRARY TRUE)
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find_package(OpenAL REQUIRED)
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find_package(Bullet REQUIRED)
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@ -1,8 +1,10 @@
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# Locate SDL2 library
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# 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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# 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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# and creates:
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# - SDL2::SDL2 imported target
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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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@ -12,21 +14,15 @@
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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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# SDL2_STATIC
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# If this is defined, this module will search for static libraries.
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# On Windows, it is uncertain whether a .lib belongs to a dynamic or static SDL2 build.
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#
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# Don't forget to include SDL2main.h and SDL2main.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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@ -70,140 +66,151 @@
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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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FIND_PATH(SDL2_INCLUDE_DIR SDL.h
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HINTS
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$ENV{SDL2DIR}
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PATH_SUFFIXES include/SDL2 include
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PATHS
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~/Library/Frameworks
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/Library/Frameworks
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/usr/local/include/SDL2
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/usr/include/SDL2
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/sw # Fink
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/opt/local # DarwinPorts
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/opt/csw # Blastwave
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/opt
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)
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#MESSAGE("SDL2_INCLUDE_DIR is ${SDL2_INCLUDE_DIR}")
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FIND_LIBRARY(SDL2_LIBRARY_PATH
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NAMES SDL2
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HINTS
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$ENV{SDL2DIR}
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PATH_SUFFIXES lib64 lib
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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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set(SDL2_LIBRARY_ONLY ${SDL2_LIBRARY_PATH} CACHE STRING "The SDL2 library, with no other libraries.")
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set(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_PATH})
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#MESSAGE("SDL2_LIBRARY_TEMP is ${SDL2_LIBRARY_TEMP}")
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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
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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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find_path(SDL2_INCLUDE_DIR SDL.h
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HINTS
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$ENV{SDL2DIR}
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PATH_SUFFIXES
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include/SDL2 include
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PATHS
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~/Library/Frameworks
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/Library/Frameworks
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/usr/local/include/SDL2
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/usr/include/SDL2
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/sw # Fink
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/opt/local # DarwinPorts
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/opt/csw # Blastwave
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/opt
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)
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ENDIF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
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ENDIF(NOT SDL2_BUILDING_LIBRARY)
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find_library(SDL2_SHARED_LIBRARY_PATH
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NAMES SDL2
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HINTS
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$ENV{SDL2DIR}
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PATH_SUFFIXES
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lib64 lib
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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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find_library(SDL2_STATIC_LIBRARY_PATH
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NAMES libSDL2.lib libSDL2.a SDL2.lib SDL2.a
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HINTS
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$ENV{SDL2DIR}
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PATH_SUFFIXES
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lib64 lib
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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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if(SDL2_STATIC)
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set(SDL2_LIBRARY_PATH ${SDL2_STATIC_LIBRARY_PATH})
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else()
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set(SDL2_LIBRARY_PATH ${SDL2_SHARED_LIBRARY_PATH})
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endif()
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find_library(SDL2_SDL2MAIN_LIBRARY_PATH
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NAMES libSDL2main.lib libSDL2main.a SDL2main.lib SDL2main.a
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HINTS
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$ENV{SDL2DIR}
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PATH_SUFFIXES
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lib64 lib
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PATHS
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~/Library/Frameworks
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/Library/Frameworks
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/usr/local/include/SDL2
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/usr/include/SDL2
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/sw # Fink
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/opt/local # DarwinPorts
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/opt/csw # Blastwave
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/opt
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)
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if(SDL2_INCLUDE_DIR)
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file(READ "${SDL2_INCLUDE_DIR}/SDL_version.h" _SDL_VERSION_H)
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set(SDL2_REGEXES
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"SDL_MAJOR_VERSION[ ]+([0-9]+)"
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"SDL_MINOR_VERSION[ ]+([0-9]+)"
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"SDL_PATCHLEVEL[ ]+([0-9]+)"
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)
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set(_SDL2_VERSION)
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foreach(_SDL2_REGEX ${SDL2_REGEXES})
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string(REGEX MATCH "${_SDL2_REGEX}" _SDL2_NUMBER "${_SDL_VERSION_H}")
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if(NOT _SDL2_NUMBER)
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message(AUTHOR_WARNING "Cannot detect SDL2 version: regex \"${_SDL2_REGEX}\" does not match")
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endif()
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list(APPEND _SDL2_VERSION "${CMAKE_MATCH_1}")
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endforeach()
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string(REPLACE ";" "." SDL2_VERSION "${_SDL2_VERSION}")
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endif()
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set(SDL2_DEPENDENCIES)
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# For SDLmain
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if(SDL2_STATIC)
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list(APPEND SDL2_DEPENDENCIES ${CMAKE_DL_LIBS})
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endif()
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if(SDL2_STATIC AND NOT SDL2_BUILDING_LIBRARY)
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list(APPEND SDL2_DEPENDENCIES ${SDL2_SDL2MAIN_LIBRARY_PATH})
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endif()
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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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list(APPEND SDL2_DEPENDENCIES "-framework Cocoa")
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endif()
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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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# 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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find_package(Threads REQUIRED)
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list(APPEND SDL2_DEPENDENCIES Threads::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 -lSDL2main -lSDL2 -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(MINGW)
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SET(SDL2_FOUND "NO")
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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})
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ENDIF(MINGW)
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IF(WIN32)
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SET(SDL2_LIBRARY_TEMP winmm imm32 version msimg32 ${SDL2_LIBRARY_TEMP})
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ENDIF(WIN32)
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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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SET(SDL2_FOUND "YES")
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ENDIF(SDL2_LIBRARY_TEMP)
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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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IF(SDL2_STATIC)
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if (UNIX AND NOT APPLE)
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EXECUTE_PROCESS(COMMAND sdl2-config --static-libs OUTPUT_VARIABLE SDL2_LINK_FLAGS)
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STRING(REGEX REPLACE "(\r?\n)+$" "" SDL2_LINK_FLAGS "${SDL2_LINK_FLAGS}")
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SET(SDL2_LIBRARY ${SDL2_LINK_FLAGS})
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ENDIF()
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ENDIF(SDL2_STATIC)
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if(SDL2_FOUND AND NOT TARGET SDL2::SDL2)
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add_library(SDL2 INTERFACE)
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target_link_libraries(SDL2
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INTERFACE
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${SDL2_LIBRARY}
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)
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target_include_directories(SDL2 SYSTEM
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INTERFACE
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"${SDL2_INCLUDE_DIR}"
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)
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add_library(SDL2::SDL2 ALIAS SDL2)
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if(MINGW)
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set(MINGW32_LIBRARY mingw32 CACHE STRING "mwindows for MinGW")
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list(APPEND SDL2_DEPENDENCIES ${MINGW32_LIBRARY})
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endif()
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if(WIN32)
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list(APPEND SDL2_DEPENDENCIES winmm imm32 version msimg32)
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endif()
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set(SDL2_LIBRARY ${SDL2_LIBRARY_PATH} ${SDL2_DEPENDENCIES})
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set(SDL2_REQUIRED_LIBS SDL2_LIBRARY_PATH)
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if(NOT SDL2_BUILDING_LIBRARY)
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list(APPEND SDL2_REQUIRED_LIBS SDL2_SDL2MAIN_LIBRARY_PATH)
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endif()
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(SDL2
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FOUND_VAR SDL2_FOUND
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REQUIRED_VARS ${SDL2_REQUIRED_LIBS} SDL2_INCLUDE_DIR
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VERSION_VAR SDL2_VERSION
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)
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if(SDL2_FOUND)
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add_library(SDL2::SDL2 INTERFACE IMPORTED)
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set_property(TARGET SDL2::SDL2
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PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${SDL2_INCLUDE_DIR})
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set_property(TARGET SDL2::SDL2
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PROPERTY INTERFACE_LINK_LIBRARIES ${SDL2_LIBRARY})
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endif()
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