Enhanced SDL2Config.cmake to also work on non-Windows
tested Linux; I assume most other Unices are similar; I don't have a Macmain
Daniel Gibson
Sam Lantinga
parent
3ea11f9acb
commit
c342696172
199
SDL2Config.cmake
199
SDL2Config.cmake
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@ -1,96 +1,127 @@
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include("${CMAKE_CURRENT_LIST_DIR}/SDL2Targets.cmake")
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# provide ${SDL2_LIBRARIES}, ${SDL2_INCLUDE_DIRS} etc, like sdl2-config.cmake does,
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# for compatibility between SDL2 built with autotools and SDL2 built with CMake
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# cuts off the path at the last (back)slash
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function(my_dirname FILEPATH RETVAL)
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string(FIND ${FILEPATH} "/" slashPos REVERSE)
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string(FIND ${FILEPATH} "\\" bsPos REVERSE) # TODO: untested, cmake always gave me forward slashes
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if(DEFINED slashPos)
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if( (DEFINED bsPos) AND (${bsPos} GREATER ${slashPos}) )
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set(slashPos, ${bsPos})
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endif()
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elseif(DEFINED bsPos)
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set(slashPos, ${bsPos})
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endif()
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if(DEFINED slashPos)
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string(SUBSTRING ${FILEPATH} 0 ${slashPos} dirname)
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set(${RETVAL} ${dirname} PARENT_SCOPE)
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endif()
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endfunction()
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# the following seems to work on Windows for both MSVC and MINGW+MSYS and with both SDL2Config/Target.cmake
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# from vcpkg and from building myself with cmake from latest git
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# AND on Linux when building SDL2 (tested current git) with CMake
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# the headers are easy - but note that this adds both .../include/ and .../include/SDL2/
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# while the SDL2_INCLUDE_DIRS of sdl2-config.cmake only add ...include/SDL2/
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# But at least if building worked with sdl2-config.cmake it will also work with this.
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get_target_property(SDL2_INCLUDE_DIRS SDL2::SDL2 INTERFACE_INCLUDE_DIRECTORIES)
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if(WIN32)
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# this seems to work for both MSVC and MINGW+MSYS and with both SDL2Config/Target.cmake from vcpkg
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# and from building myself with cmake from latest git
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# get the paths to the .lib files for both SDL2 and SDL2main
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# ok, the headers are easy - but note that this adds both .../include and .../include/SDL2/
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# while the SDL2_INCLUDE_DIRS of sdl2-config.cmake only add ...include/SDL2/
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# But at least if building worked with sdl2-config.cmake it will also work with this.
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get_target_property(SDL2_INCLUDE_DIRS SDL2::SDL2 INTERFACE_INCLUDE_DIRECTORIES)
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# for the "normal"/release build they could be in lots of different properties..
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set(relprops IMPORTED_IMPLIB_RELEASE IMPORTED_IMPLIB_NOCONFIG IMPORTED_IMPLIB IMPORTED_IMPLIB_MINSIZEREL IMPORTED_IMPLIB_RELWITHDEBINFO
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IMPORTED_LOCATION_RELEASE IMPORTED_LOCATION_NOCONFIG IMPORTED_LOCATION IMPORTED_LOCATION_MINSIZEREL IMPORTED_LOCATION_RELWITHDEBINFO)
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# get the paths to the .lib files for both SDL2 and SDL2main
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# they could be in lots of different properties..
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get_target_property(sdl2implib SDL2::SDL2 IMPORTED_IMPLIB_RELEASE)
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get_target_property(sdl2implibdbg SDL2::SDL2 IMPORTED_IMPLIB_DEBUG)
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# fewer possibilities for debug builds
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set(dbgprops IMPORTED_IMPLIB_DEBUG IMPORTED_LOCATION_DEBUG)
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# TODO: for all this bla_RELEASE bla_DEBUG etc stuff, maybe only try the ones
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# from get_target_property(available_configs SDL2::SDL2 IMPORTED_CONFIGURATIONS) ?
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# OR otherwise at least try all of NOCONFIG, RELEASE, MINSIZEREL, RELWITHDEBINFO, DEBUG (possibly in that order)?
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get_target_property(sdl2mainimplib SDL2::SDL2main IMPORTED_IMPLIB_RELEASE)
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if(NOT sdl2mainimplib)
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get_target_property(sdl2mainimplib SDL2::SDL2main IMPORTED_LOCATION_RELEASE)
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endif()
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get_target_property(sdl2mainimplibdbg SDL2::SDL2main IMPORTED_IMPLIB_DEBUG)
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if(NOT sdl2mainimplibdbg)
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get_target_property(sdl2mainimplibdbg SDL2::SDL2main IMPORTED_LOCATION_DEBUG)
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endif()
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if( sdl2implib AND sdl2mainimplib AND sdl2implibdbg AND sdl2mainimplibdbg )
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# we have both release and debug builds of SDL2 and SDL2main, so use this ugly
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# generator expression in SDL2_LIBRARIES to support both in MSVC, depending on build type configured there
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set(SDL2_LIBRARIES $<IF:$<CONFIG:Debug>,${sdl2mainimplibdbg},${sdl2mainimplib}> $<IF:$<CONFIG:Debug>,${sdl2implibdbg},${sdl2implib}>)
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foreach(prop ${relprops})
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get_target_property(sdl2implib SDL2::SDL2 ${prop})
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if(sdl2implib)
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#message("set sdl2implib from ${prop}")
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break()
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else()
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if(NOT sdl2implib) # try to get it from other properties
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foreach(prop IMPORTED_IMPLIB IMPORTED_IMPLIB_NOCONFIG IMPORTED_IMPLIB_DEBUG IMPORTED_LOCATION_RELEASE IMPORTED_LOCATION_DEBUG)
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get_target_property(sdl2implib SDL2::SDL2 ${prop})
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if(sdl2implib)
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message(STATUS "succeeded with ${prop} => ${sdl2implib}")
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break()
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endif()
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message(STATUS "no luck with ${prop}")
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endforeach()
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endif()
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if(NOT sdl2mainimplib)
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foreach(prop IMPORTED_IMPLIB IMPORTED_IMPLIB_NOCONFIG IMPORTED_IMPLIB_DEBUG IMPORTED_LOCATION_RELEASE IMPORTED_LOCATION_DEBUG)
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get_target_property(sdl2mainimplib SDL2::SDL2main ${prop})
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if(sdl2mainimplib)
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message(STATUS "succeeded with ${prop} => ${sdl2mainimplib}")
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break()
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endif()
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message(STATUS "no luck with ${prop}")
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endforeach()
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endif()
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if( sdl2implib AND sdl2mainimplib )
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set(SDL2_LIBRARIES ${sdl2mainimplib} ${sdl2implib})
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else()
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message(FATAL_ERROR, "SDL2::SDL2 and/or SDL2::SDL2main don't seem to contain any kind of IMPORTED_IMPLIB")
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endif()
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#message("no luck for sdl2implib with ${prop}")
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endif()
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endforeach()
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foreach(prop ${relprops})
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get_target_property(sdl2mainimplib SDL2::SDL2main ${prop})
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if(sdl2mainimplib)
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#message("set sdl2mainimplib from ${prop}")
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break()
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else()
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#message("no luck for sdl2mainimplib with ${prop}")
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endif()
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endforeach()
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foreach(prop ${dbgprops})
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get_target_property(sdl2implibdbg SDL2::SDL2 ${prop})
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if(sdl2implibdbg)
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#message("set sdl2implibdbg from ${prop}")
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break()
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else()
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#message("no luck for sdl2implibdbg with ${prop}")
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endif()
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endforeach()
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foreach(prop ${dbgprops})
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get_target_property(sdl2mainimplibdbg SDL2::SDL2main ${prop})
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if(sdl2mainimplibdbg)
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#message("set sdl2mainimplibdbg from ${prop}")
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break()
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else()
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#message("no luck for sdl2mainimplibdbg with ${prop}")
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endif()
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endforeach()
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if( sdl2implib AND sdl2mainimplib AND sdl2implibdbg AND sdl2mainimplibdbg )
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# we have both release and debug builds of SDL2 and SDL2main, so use this ugly
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# generator expression in SDL2_LIBRARIES to support both in MSVC, depending on build type configured there
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set(SDL2_LIBRARIES $<IF:$<CONFIG:Debug>,${sdl2mainimplibdbg},${sdl2mainimplib}> $<IF:$<CONFIG:Debug>,${sdl2implibdbg},${sdl2implib}>)
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else()
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if( (NOT sdl2implib) AND sdl2implibdbg ) # if we only have a debug version of the lib
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set(sdl2implib sdl2implibdbg)
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endif()
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if( (NOT sdl2mainimplib) AND sdl2mainimplibdbg ) # if we only have a debug version of the lib
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set(sdl2mainimplib sdl2mainimplibdbg)
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endif()
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# NOTE: SDL2_LIBRARIES now looks like "c:/path/to/SDL2main.lib;c:/path/to/SDL2.lib"
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# which is different to what it looks like when coming from sdl2-config.cmake
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# (there it's more like "-L${SDL2_LIBDIR} -lSDL2main -lSDL2" - and also -lmingw32 and -mwindows)
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# This seems to work with both MSVC and MinGW though, while the other only worked with MinGW
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my_dirname(${sdl2implib} SDL2_LIBDIR)
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my_dirname(${SDL2_LIBDIR} SDL2_EXEC_PREFIX) # the exec prefix is one level up from lib/ - TODO: really, always? at least on Linux there's /usr/lib/x86_64-bla-blub/libSDL2-asdf.so.0 ..
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set(SDL2_PREFIX ${SDL2_PREFIX}) # TODO: could this be somewhere else? parent dir of include or sth?
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elseif() # not windows
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# TODO: about the same but don't have to look at *_IMPLIB* as that's windows specific, it should be in IMPORTED_LOCATION*
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# TODO: make SDL2_LIBRARIES look more like the original (instead of path to libSDL2.so)?
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# TODO: anything special about macOS? I can't test that, I have no Mac
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if( sdl2implib AND sdl2mainimplib )
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set(SDL2_LIBRARIES ${sdl2mainimplib} ${sdl2implib})
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elseif(WIN32 OR APPLE) # I think these platforms have a non-dummy SDLmain?
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message(FATAL_ERROR, "SDL2::SDL2 and/or SDL2::SDL2main don't seem to contain any kind of IMPORTED_IMPLIB* or IMPORTED_LOCATION*")
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elseif(sdl2implib) # on other platforms just libSDL2 will hopefully do?
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set(SDL2_LIBRARIES ${sdl2implib})
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message(STATUS, "No SDL2main lib not found, I hope you don't need it..")
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else()
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message(FATAL_ERROR, "SDL2::SDL2 doesn't seem to contain any kind of lib to link against in IMPORTED_IMPLIB* or IMPORTED_LOCATION*")
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endif()
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endif()
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get_filename_component(SDL2_LIBDIR ${sdl2implib} PATH)
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# NOTE: SDL2_LIBRARIES now looks like "c:/path/to/SDL2main.lib;c:/path/to/SDL2.lib"
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# which is different to what it looks like when coming from sdl2-config.cmake
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# (there it's more like "-L${SDL2_LIBDIR} -lSDL2main -lSDL2" - and also -lmingw32 and -mwindows)
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# This seems to work with both MSVC and MinGW though, while the other only worked with MinGW
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# We *could* use if(MSVC) here and make the MinGW case oldschool, BUT keep in mind that
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# for some reason vcpkg has SDL2.lib and SDL2main.lib in different directories!
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# On Linux it looks like "/tmp/sdl2inst/lib/libSDL2main.a;/tmp/sdl2inst/lib/libSDL2-2.0.so.0.14.1" which also seems to work
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if(FALSE) # this (not tested much) could be used to make SDL2_LIBRARIES look/behave more like the original from sdl2-config.cmake
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#if(NOT MSVC) # this is GCC/ld syntax (should also work for mingw and clang), not suitable for MSVC
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if(sdl2mainimplib) # we have libSDL2main
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# first set libSDL2main and its directory
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get_filename_component(sdl2main_libdir ${sdl2mainimplib} PATH)
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set(SDL2_LIBRARIES "-L${sdl2main_libdir} -lSDL2main")
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# SDL2main can be in a different directory than libSDL2 itself, at least when using vcpkg
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# if that's the case, add an additional "-L" part for libSDL2's libdir
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if( NOT (sdl2main_libdir STREQUAL SDL2_LIBDIR) )
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set(SDL2_LIBRARIES "${SDL2_LIBRARIES} -L${SDL2_LIBDIR}")
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endif()
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# lastly, add -lSDL2 itself
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set(SDL2_LIBRARIES "${SDL2_LIBRARIES} -lSDL2")
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unset(sdl2main_libdir)
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else() # no SDL2main, just libSDL2 itself
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set(SDL2_LIBRARIES "-L${SDL2_LIBDIR} -lSDL2")
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endif()
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endif()
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# the exec prefix is one level up from lib/ - TODO: really, always? at least on Linux there's /usr/lib/x86_64-bla-blub/libSDL2-asdf.so.0 ..
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get_filename_component(SDL2_EXEC_PREFIX ${SDL2_LIBDIR} PATH)
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set(SDL2_PREFIX ${SDL2_EXEC_PREFIX}) # TODO: could this be somewhere else? parent dir of include or sth?
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unset(sdl2implib)
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unset(sdl2mainimplib)
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unset(sdl2implibdbg)
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unset(sdl2mainimplibdbg)
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unset(relprops)
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unset(dbgprops)
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