Enhanced SDL2Config.cmake to also work on non-Windows

tested Linux; I assume most other Unices are similar; I don't have a Mac
This commit is contained in:
Daniel Gibson 2021-04-18 17:15:34 +02:00 committed by Sam Lantinga
parent 3ea11f9acb
commit c342696172
1 changed files with 115 additions and 84 deletions

View File

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