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CMakeLists.txt

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2194 lines (2001 loc) · 74.2 KB
 
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if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
message(FATAL_ERROR "Prevented in-tree built. Please create a build directory outside of the SDL source code and call cmake from there")
endif()
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# !!! FIXME: this should probably do "MACOSX_RPATH ON" as a target property
# !!! FIXME: for the SDL2 shared library (so you get an
# !!! FIXME: install_name ("soname") of "@rpath/libSDL-whatever.dylib"
# !!! FIXME: instead of "/usr/local/lib/libSDL-whatever.dylib"), but I'm
# !!! FIXME: punting for now and leaving the existing behavior. Until this
# !!! FIXME: properly resolved, this line silences a warning in CMake 3.0+.
# !!! FIXME: remove it and this comment entirely once the problem is
# !!! FIXME: properly resolved.
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#cmake_policy(SET CMP0042 OLD)
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include(CheckFunctionExists)
include(CheckLibraryExists)
include(CheckIncludeFiles)
include(CheckIncludeFile)
include(CheckSymbolExists)
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include(CheckCSourceCompiles)
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include(CheckCSourceRuns)
include(CheckCCompilerFlag)
include(CheckTypeSize)
include(CheckStructHasMember)
include(CMakeDependentOption)
include(FindPkgConfig)
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set(CMAKE_MODULE_PATH "${SDL2_SOURCE_DIR}/cmake")
include(${SDL2_SOURCE_DIR}/cmake/macros.cmake)
include(${SDL2_SOURCE_DIR}/cmake/sdlchecks.cmake)
# General settings
# Edit include/SDL_version.h and change the version, then:
# SDL_MICRO_VERSION += 1;
# SDL_INTERFACE_AGE += 1;
# SDL_BINARY_AGE += 1;
# if any functions have been added, set SDL_INTERFACE_AGE to 0.
# if backwards compatibility has been broken,
# set SDL_BINARY_AGE and SDL_INTERFACE_AGE to 0.
set(SDL_MAJOR_VERSION 2)
set(SDL_MINOR_VERSION 0)
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set(SDL_INTERFACE_AGE 0)
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set(SDL_VERSION "${SDL_MAJOR_VERSION}.${SDL_MINOR_VERSION}.${SDL_MICRO_VERSION}")
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# the following should match the versions in Xcode project file:
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# Set defaults preventing destination file conflicts
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CACHE STRING "Name suffix for debug builds")
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mark_as_advanced(CMAKE_IMPORT_LIBRARY_SUFFIX SDL_CMAKE_DEBUG_POSTFIX)
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# Calculate a libtool-like version number
math(EXPR LT_CURRENT "${SDL_MICRO_VERSION} - ${SDL_INTERFACE_AGE}")
math(EXPR LT_AGE "${SDL_BINARY_AGE} - ${SDL_INTERFACE_AGE}")
math(EXPR LT_MAJOR "${LT_CURRENT}- ${LT_AGE}")
set(LT_REVISION "${SDL_INTERFACE_AGE}")
set(LT_RELEASE "${SDL_MAJOR_VERSION}.${SDL_MINOR_VERSION}")
set(LT_VERSION "${LT_MAJOR}.${LT_AGE}.${LT_REVISION}")
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#message(STATUS "${LT_VERSION} :: ${LT_AGE} :: ${LT_REVISION} :: ${LT_CURRENT} :: ${LT_RELEASE}")
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# General settings & flags
set(LIBRARY_OUTPUT_DIRECTORY "build")
# Check for 64 or 32 bit
set(SIZEOF_VOIDP ${CMAKE_SIZEOF_VOID_P})
if(CMAKE_SIZEOF_VOID_P EQUAL 8)
set(ARCH_64 TRUE)
set(PROCESSOR_ARCH "x64")
else()
set(ARCH_64 FALSE)
set(PROCESSOR_ARCH "x86")
endif()
set(LIBNAME SDL2)
if(NOT LIBTYPE)
set(LIBTYPE SHARED)
endif()
# Get the platform
if(WIN32)
if(NOT WINDOWS)
set(WINDOWS TRUE)
endif()
elseif(UNIX AND NOT APPLE)
if(CMAKE_SYSTEM_NAME MATCHES ".*Linux")
set(LINUX TRUE)
elseif(CMAKE_SYSTEM_NAME MATCHES "kFreeBSD.*")
set(FREEBSD TRUE)
elseif(CMAKE_SYSTEM_NAME MATCHES "kNetBSD.*|NetBSD.*")
set(NETBSD TRUE)
elseif(CMAKE_SYSTEM_NAME MATCHES "kOpenBSD.*|OpenBSD.*")
set(OPENBSD TRUE)
elseif(CMAKE_SYSTEM_NAME MATCHES ".*GNU.*")
set(GNU TRUE)
elseif(CMAKE_SYSTEM_NAME MATCHES ".*BSDI.*")
set(BSDI TRUE)
elseif(CMAKE_SYSTEM_NAME MATCHES "DragonFly.*|FreeBSD")
set(FREEBSD TRUE)
elseif(CMAKE_SYSTEM_NAME MATCHES "SYSV5.*")
set(SYSV5 TRUE)
elseif(CMAKE_SYSTEM_NAME MATCHES "Solaris.*")
set(SOLARIS TRUE)
elseif(CMAKE_SYSTEM_NAME MATCHES "HP-UX.*")
set(HPUX TRUE)
elseif(CMAKE_SYSTEM_NAME MATCHES "AIX.*")
set(AIX TRUE)
elseif(CMAKE_SYSTEM_NAME MATCHES "Minix.*")
set(MINIX TRUE)
endif()
elseif(APPLE)
if(CMAKE_SYSTEM_NAME MATCHES ".*Darwin.*")
set(DARWIN TRUE)
elseif(CMAKE_SYSTEM_NAME MATCHES ".*MacOS.*")
set(MACOSX TRUE)
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elseif(CMAKE_SYSTEM_NAME MATCHES ".*tvOS.*")
set(TVOS TRUE)
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endif()
# TODO: iOS?
elseif(CMAKE_SYSTEM_NAME MATCHES "BeOS.*")
message_error("BeOS support has been removed as of SDL 2.0.2.")
elseif(CMAKE_SYSTEM_NAME MATCHES "Haiku.*")
set(HAIKU TRUE)
endif()
# Don't mistake osx for unix
if(UNIX AND NOT APPLE)
set(UNIX_SYS ON)
else()
set(UNIX_SYS OFF)
endif()
if(UNIX OR APPLE)
set(UNIX_OR_MAC_SYS ON)
else()
set(UNIX_OR_MAC_SYS OFF)
endif()
if (UNIX_OR_MAC_SYS AND NOT EMSCRIPTEN) # JavaScript does not yet have threading support, so disable pthreads when building for Emscripten.
set(SDL_PTHREADS_ENABLED_BY_DEFAULT ON)
else()
set(SDL_PTHREADS_ENABLED_BY_DEFAULT OFF)
endif()
# Default option knobs
if(APPLE OR ARCH_64)
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if(NOT "${CMAKE_OSX_ARCHITECTURES}" MATCHES "arm")
set(OPT_DEF_SSEMATH ON)
endif()
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endif()
if(UNIX OR MINGW OR MSYS)
set(OPT_DEF_LIBC ON)
endif()
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# The hidraw support doesn't catch Xbox, PS4 and Nintendo controllers,
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# so we'll just use libusb when it's available. libusb does not support iOS,
# so we default to yes on iOS.
# TODO: Windows can support libusb, the hid.c file just depends on Unix APIs
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if(WINDOWS OR IOS OR TVOS OR ANDROID)
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set(HIDAPI_SKIP_LIBUSB TRUE)
else()
set(HIDAPI_SKIP_LIBUSB FALSE)
endif()
if (HIDAPI_SKIP_LIBUSB)
set(OPT_DEF_HIDAPI ON)
endif()
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# On the other hand, *BSD specifically uses libusb only, so we make a special
# case just for them.
if(FREEBSD OR NETBSD OR OPENBSD OR BSDI)
set(HIDAPI_ONLY_LIBUSB TRUE)
else()
set(HIDAPI_ONLY_LIBUSB FALSE)
endif()
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# Compiler info
if(CMAKE_COMPILER_IS_GNUCC)
set(USE_GCC TRUE)
set(OPT_DEF_ASM TRUE)
elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
set(USE_CLANG TRUE)
set(OPT_DEF_ASM TRUE)
elseif(MSVC_VERSION GREATER 1400) # VisualStudio 8.0+
set(OPT_DEF_ASM TRUE)
#set(CMAKE_C_FLAGS "/ZI /WX- /
else()
set(OPT_DEF_ASM FALSE)
endif()
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if(USE_GCC OR USE_CLANG)
set(OPT_DEF_GCC_ATOMICS ON)
endif()
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# Default flags, if not set otherwise
if("$ENV{CFLAGS}" STREQUAL "")
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if(CMAKE_BUILD_TYPE STREQUAL "")
if(USE_GCC OR USE_CLANG)
set(CMAKE_C_FLAGS "-g -O3")
endif()
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endif()
else()
set(CMAKE_C_FLAGS "$ENV{CFLAGS}")
list(APPEND EXTRA_CFLAGS "$ENV{CFLAGS}")
endif()
if(NOT ("$ENV{CFLAGS}" STREQUAL "")) # Hackish, but does the trick on Win32
list(APPEND EXTRA_LDFLAGS "$ENV{LDFLAGS}")
endif()
if(MSVC)
option(FORCE_STATIC_VCRT "Force /MT for static VC runtimes" OFF)
if(FORCE_STATIC_VCRT)
foreach(flag_var
CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE
CMAKE_C_FLAGS_MINSIZEREL CMAKE_C_FLAGS_RELWITHDEBINFO)
if(${flag_var} MATCHES "/MD")
string(REGEX REPLACE "/MD" "/MT" ${flag_var} "${${flag_var}}")
endif()
endforeach()
endif()
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# Make sure /RTC1 is disabled, otherwise it will use functions from the CRT
foreach(flag_var
CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE
CMAKE_C_FLAGS_MINSIZEREL CMAKE_C_FLAGS_RELWITHDEBINFO)
string(REGEX REPLACE "/RTC(su|[1su])" "" ${flag_var} "${${flag_var}}")
endforeach(flag_var)
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endif()
# Those are used for pkg-config and friends, so that the SDL2.pc, sdl2-config,
# etc. are created correctly.
set(SDL_LIBS "-lSDL2")
set(SDL_CFLAGS "")
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# When building shared lib for Windows with MinGW,
# avoid the DLL having a "lib" prefix
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set(CMAKE_SHARED_LIBRARY_PREFIX "")
endif()
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# Emscripten toolchain has a nonempty default value for this, and the checks
# in this file need to change that, so remember the original value, and
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# restore back to that afterwards. For check_function_exists() to work in
# Emscripten, this value must be at its default value.
set(ORIG_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
if(CYGWIN)
# We build SDL on cygwin without the UNIX emulation layer
include_directories("-I/usr/include/mingw")
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -mno-cygwin")
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check_c_source_compiles("int main(int argc, char **argv) {}"
HAVE_GCC_NO_CYGWIN)
set(CMAKE_REQUIRED_FLAGS ${ORIG_CMAKE_REQUIRED_FLAGS})
if(HAVE_GCC_NO_CYGWIN)
list(APPEND EXTRA_LDFLAGS "-mno-cygwin")
list(APPEND SDL_LIBS "-mno-cygwin")
endif()
set(SDL_CFLAGS "${SDL_CFLAGS} -I/usr/include/mingw")
endif()
add_definitions(-DUSING_GENERATED_CONFIG_H)
# General includes
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include_directories(${SDL2_BINARY_DIR}/include ${SDL2_SOURCE_DIR}/include)
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if(USE_GCC OR USE_CLANG)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -idirafter ${SDL2_SOURCE_DIR}/src/video/khronos")
else()
include_directories(${SDL2_SOURCE_DIR}/src/video/khronos)
endif()
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# All these ENABLED_BY_DEFAULT vars will default to ON if not specified, so
# you only need to have a platform override them if they are disabling.
set(OPT_DEF_ASM TRUE)
if(EMSCRIPTEN)
# Set up default values for the currently supported set of subsystems:
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# Emscripten/Javascript does not have assembly support, a dynamic library
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# loading architecture, low-level CPU inspection or multithreading.
set(OPT_DEF_ASM FALSE)
set(SDL_SHARED_ENABLED_BY_DEFAULT OFF)
set(SDL_ATOMIC_ENABLED_BY_DEFAULT OFF)
set(SDL_THREADS_ENABLED_BY_DEFAULT OFF)
set(SDL_LOADSO_ENABLED_BY_DEFAULT OFF)
set(SDL_CPUINFO_ENABLED_BY_DEFAULT OFF)
set(SDL_DLOPEN_ENABLED_BY_DEFAULT OFF)
endif()
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# When defined, respect CMake's BUILD_SHARED_LIBS setting:
set(SDL_STATIC_ENABLED_BY_DEFAULT ON)
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if (NOT DEFINED SDL_SHARED_ENABLED_BY_DEFAULT)
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# ...unless decided already (as for EMSCRIPTEN)
set(SDL_SHARED_ENABLED_BY_DEFAULT OFF)
if (NOT DEFINED BUILD_SHARED_LIBS)
# No preference? Build both, just like the AC/AM configure
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elseif (BUILD_SHARED_LIBS)
# In this case, we assume the user wants a shared lib and don't build
# the static one
set(SDL_SHARED_ENABLED_BY_DEFAULT ON)
set(SDL_STATIC_ENABLED_BY_DEFAULT OFF)
endif()
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endif()
set(SDL_SUBSYSTEMS
Atomic Audio Video Render Events Joystick Haptic Power Threads Timers
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File Loadso CPUinfo Filesystem Dlopen Sensor)
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foreach(_SUB ${SDL_SUBSYSTEMS})
string(TOUPPER ${_SUB} _OPT)
if (NOT DEFINED SDL_${_OPT}_ENABLED_BY_DEFAULT)
set(SDL_${_OPT}_ENABLED_BY_DEFAULT ON)
endif()
option(SDL_${_OPT} "Enable the ${_SUB} subsystem" ${SDL_${_OPT}_ENABLED_BY_DEFAULT})
endforeach()
option_string(ASSERTIONS "Enable internal sanity checks (auto/disabled/release/enabled/paranoid)" "auto")
#set_option(DEPENDENCY_TRACKING "Use gcc -MMD -MT dependency tracking" ON)
set_option(LIBC "Use the system C library" ${OPT_DEF_LIBC})
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set_option(GCC_ATOMICS "Use gcc builtin atomics" ${OPT_DEF_GCC_ATOMICS})
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set_option(ASSEMBLY "Enable assembly routines" ${OPT_DEF_ASM})
set_option(SSEMATH "Allow GCC to use SSE floating point math" ${OPT_DEF_SSEMATH})
set_option(MMX "Use MMX assembly routines" ${OPT_DEF_ASM})
set_option(3DNOW "Use 3Dnow! MMX assembly routines" ${OPT_DEF_ASM})
set_option(SSE "Use SSE assembly routines" ${OPT_DEF_ASM})
set_option(SSE2 "Use SSE2 assembly routines" ${OPT_DEF_SSEMATH})
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set_option(SSE3 "Use SSE3 assembly routines" ${OPT_DEF_SSEMATH})
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set_option(ALTIVEC "Use Altivec assembly routines" ${OPT_DEF_ASM})
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set_option(ARMSIMD "use SIMD assembly blitters on ARM" ON)
set_option(ARMNEON "use NEON assembly blitters on ARM" ON)
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set_option(DISKAUDIO "Support the disk writer audio driver" ON)
set_option(DUMMYAUDIO "Support the dummy audio driver" ON)
set_option(VIDEO_DIRECTFB "Use DirectFB video driver" OFF)
dep_option(DIRECTFB_SHARED "Dynamically load directfb support" ON "VIDEO_DIRECTFB" OFF)
set_option(VIDEO_DUMMY "Use dummy video driver" ON)
set_option(VIDEO_OPENGL "Include OpenGL support" ON)
set_option(VIDEO_OPENGLES "Include OpenGL ES support" ON)
set_option(PTHREADS "Use POSIX threads for multi-threading" ${SDL_PTHREADS_ENABLED_BY_DEFAULT})
dep_option(PTHREADS_SEM "Use pthread semaphores" ON "PTHREADS" OFF)
set_option(SDL_DLOPEN "Use dlopen for shared object loading" ${SDL_DLOPEN_ENABLED_BY_DEFAULT})
set_option(OSS "Support the OSS audio API" ${UNIX_SYS})
set_option(ALSA "Support the ALSA audio API" ${UNIX_SYS})
dep_option(ALSA_SHARED "Dynamically load ALSA audio support" ON "ALSA" OFF)
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set_option(JACK "Support the JACK audio API" ${UNIX_SYS})
dep_option(JACK_SHARED "Dynamically load JACK audio support" ON "JACK" OFF)
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set_option(ESD "Support the Enlightened Sound Daemon" ${UNIX_SYS})
dep_option(ESD_SHARED "Dynamically load ESD audio support" ON "ESD" OFF)
set_option(PULSEAUDIO "Use PulseAudio" ${UNIX_SYS})
dep_option(PULSEAUDIO_SHARED "Dynamically load PulseAudio support" ON "PULSEAUDIO" OFF)
set_option(ARTS "Support the Analog Real Time Synthesizer" ${UNIX_SYS})
dep_option(ARTS_SHARED "Dynamically load aRts audio support" ON "ARTS" OFF)
set_option(NAS "Support the NAS audio API" ${UNIX_SYS})
set_option(NAS_SHARED "Dynamically load NAS audio API" ${UNIX_SYS})
set_option(SNDIO "Support the sndio audio API" ${UNIX_SYS})
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set_option(FUSIONSOUND "Use FusionSound audio driver" OFF)
dep_option(FUSIONSOUND_SHARED "Dynamically load fusionsound audio support" ON "FUSIONSOUND" OFF)
set_option(LIBSAMPLERATE "Use libsamplerate for audio rate conversion" ${UNIX_SYS})
dep_option(LIBSAMPLERATE_SHARED "Dynamically load libsamplerate" ON "LIBSAMPLERATE" OFF)
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set_option(RPATH "Use an rpath when linking SDL" ${UNIX_SYS})
set_option(CLOCK_GETTIME "Use clock_gettime() instead of gettimeofday()" OFF)
set_option(INPUT_TSLIB "Use the Touchscreen library for input" ${UNIX_SYS})
set_option(VIDEO_X11 "Use X11 video driver" ${UNIX_SYS})
set_option(VIDEO_WAYLAND "Use Wayland video driver" ${UNIX_SYS})
dep_option(WAYLAND_SHARED "Dynamically load Wayland support" ON "VIDEO_WAYLAND" OFF)
dep_option(VIDEO_WAYLAND_QT_TOUCH "QtWayland server support for Wayland video driver" ON "VIDEO_WAYLAND" OFF)
set_option(VIDEO_RPI "Use Raspberry Pi video driver" ${UNIX_SYS})
dep_option(X11_SHARED "Dynamically load X11 support" ON "VIDEO_X11" OFF)
set(SDL_X11_OPTIONS Xcursor Xinerama XInput Xrandr Xscrnsaver XShape Xvm)
foreach(_SUB ${SDL_X11_OPTIONS})
string(TOUPPER "VIDEO_X11_${_SUB}" _OPT)
dep_option(${_OPT} "Enable ${_SUB} support" ON "VIDEO_X11" OFF)
endforeach()
set_option(VIDEO_COCOA "Use Cocoa video driver" ${APPLE})
set_option(DIRECTX "Use DirectX for Windows audio/video" ${WINDOWS})
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set_option(WASAPI "Use the Windows WASAPI audio driver" ${WINDOWS})
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set_option(RENDER_D3D "Enable the Direct3D render driver" ${WINDOWS})
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set_option(RENDER_METAL "Enable the Metal render driver" ${APPLE})
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set_option(VIDEO_VIVANTE "Use Vivante EGL video driver" ${UNIX_SYS})
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dep_option(VIDEO_VULKAN "Enable Vulkan support" ON "ANDROID OR APPLE OR LINUX OR WINDOWS" OFF)
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set_option(VIDEO_METAL "Enable Metal support" ${APPLE})
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set_option(VIDEO_KMSDRM "Use KMS DRM video driver" ${UNIX_SYS})
dep_option(KMSDRM_SHARED "Dynamically load KMS DRM support" ON "VIDEO_KMSDRM" OFF)
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set_option(VIDEO_OFFSCREEN "Use offscreen video driver" OFF)
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option_string(BACKGROUNDING_SIGNAL "number to use for magic backgrounding signal or 'OFF'" "OFF")
option_string(FOREGROUNDING_SIGNAL "number to use for magic foregrounding signal or 'OFF'" "OFF")
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set_option(HIDAPI "Use HIDAPI for low level joystick drivers" ${OPT_DEF_HIDAPI})
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set(SDL_SHARED ${SDL_SHARED_ENABLED_BY_DEFAULT} CACHE BOOL "Build a shared version of the library")
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set(SDL_STATIC ${SDL_STATIC_ENABLED_BY_DEFAULT} CACHE BOOL "Build a static version of the library")
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dep_option(SDL_STATIC_PIC "Static version of the library should be built with Position Independent Code" OFF "SDL_STATIC" OFF)
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set_option(SDL_TEST "Build the test directory" OFF)
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# General source files
file(GLOB SOURCE_FILES
${SDL2_SOURCE_DIR}/src/*.c
${SDL2_SOURCE_DIR}/src/atomic/*.c
${SDL2_SOURCE_DIR}/src/audio/*.c
${SDL2_SOURCE_DIR}/src/cpuinfo/*.c
${SDL2_SOURCE_DIR}/src/dynapi/*.c
${SDL2_SOURCE_DIR}/src/events/*.c
${SDL2_SOURCE_DIR}/src/file/*.c
${SDL2_SOURCE_DIR}/src/libm/*.c
${SDL2_SOURCE_DIR}/src/render/*.c
${SDL2_SOURCE_DIR}/src/render/*/*.c
${SDL2_SOURCE_DIR}/src/stdlib/*.c
${SDL2_SOURCE_DIR}/src/thread/*.c
${SDL2_SOURCE_DIR}/src/timer/*.c
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${SDL2_SOURCE_DIR}/src/video/yuv2rgb/*.c)
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if(ASSERTIONS STREQUAL "auto")
# Do nada - use optimization settings to determine the assertion level
elseif(ASSERTIONS STREQUAL "disabled")
set(SDL_DEFAULT_ASSERT_LEVEL 0)
elseif(ASSERTIONS STREQUAL "release")
set(SDL_DEFAULT_ASSERT_LEVEL 1)
elseif(ASSERTIONS STREQUAL "enabled")
set(SDL_DEFAULT_ASSERT_LEVEL 2)
elseif(ASSERTIONS STREQUAL "paranoid")
set(SDL_DEFAULT_ASSERT_LEVEL 3)
else()
message_error("unknown assertion level")
endif()
set(HAVE_ASSERTIONS ${ASSERTIONS})
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if(NOT BACKGROUNDING_SIGNAL STREQUAL "OFF")
add_definitions("-DSDL_BACKGROUNDING_SIGNAL=${BACKGROUNDING_SIGNAL}")
endif()
if(NOT FOREGROUNDING_SIGNAL STREQUAL "OFF")
add_definitions("-DSDL_FOREGROUNDING_SIGNAL=${FOREGROUNDING_SIGNAL}")
endif()
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# Compiler option evaluation
if(USE_GCC OR USE_CLANG)
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# Check for -Wall first, so later things can override pieces of it.
check_c_compiler_flag(-Wall HAVE_GCC_WALL)
if(HAVE_GCC_WALL)
list(APPEND EXTRA_CFLAGS "-Wall")
if(HAIKU)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-multichar")
endif()
endif()
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check_c_compiler_flag(-fno-strict-aliasing HAVE_GCC_NO_STRICT_ALIASING)
if(HAVE_GCC_NO_STRICT_ALIASING)
list(APPEND EXTRA_CFLAGS "-fno-strict-aliasing")
endif()
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check_c_compiler_flag(-Wdeclaration-after-statement HAVE_GCC_WDECLARATION_AFTER_STATEMENT)
if(HAVE_GCC_WDECLARATION_AFTER_STATEMENT)
check_c_compiler_flag(-Werror=declaration-after-statement HAVE_GCC_WERROR_DECLARATION_AFTER_STATEMENT)
if(HAVE_GCC_WERROR_DECLARATION_AFTER_STATEMENT)
list(APPEND EXTRA_CFLAGS "-Werror=declaration-after-statement")
endif()
list(APPEND EXTRA_CFLAGS "-Wdeclaration-after-statement")
endif()
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if(DEPENDENCY_TRACKING)
check_c_source_compiles("
#if !defined(__GNUC__) || __GNUC__ < 3
#error Dependency tracking requires GCC 3.0 or newer
#endif
int main(int argc, char **argv) { }" HAVE_DEPENDENCY_TRACKING)
endif()
if(GCC_ATOMICS)
check_c_source_compiles("int main(int argc, char **argv) {
int a;
void *x, *y, *z;
__sync_lock_test_and_set(&a, 4);
__sync_lock_test_and_set(&x, y);
__sync_fetch_and_add(&a, 1);
__sync_bool_compare_and_swap(&a, 5, 10);
__sync_bool_compare_and_swap(&x, y, z); }" HAVE_GCC_ATOMICS)
if(NOT HAVE_GCC_ATOMICS)
check_c_source_compiles("int main(int argc, char **argv) {
int a;
__sync_lock_test_and_set(&a, 1);
__sync_lock_release(&a); }" HAVE_GCC_SYNC_LOCK_TEST_AND_SET)
endif()
endif()
set(CMAKE_REQUIRED_FLAGS "-mpreferred-stack-boundary=2")
check_c_source_compiles("int x = 0; int main(int argc, char **argv) {}"
HAVE_GCC_PREFERRED_STACK_BOUNDARY)
set(CMAKE_REQUIRED_FLAGS ${ORIG_CMAKE_REQUIRED_FLAGS})
set(CMAKE_REQUIRED_FLAGS "-fvisibility=hidden -Werror")
check_c_source_compiles("
#if !defined(__GNUC__) || __GNUC__ < 4
#error SDL only uses visibility attributes in GCC 4 or newer
#endif
int main(int argc, char **argv) {}" HAVE_GCC_FVISIBILITY)
if(HAVE_GCC_FVISIBILITY)
list(APPEND EXTRA_CFLAGS "-fvisibility=hidden")
endif()
set(CMAKE_REQUIRED_FLAGS ${ORIG_CMAKE_REQUIRED_FLAGS})
check_c_compiler_flag(-Wshadow HAVE_GCC_WSHADOW)
if(HAVE_GCC_WSHADOW)
list(APPEND EXTRA_CFLAGS "-Wshadow")
endif()
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511
if(APPLE)
list(APPEND EXTRA_LDFLAGS "-Wl,-undefined,error")
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list(APPEND EXTRA_LDFLAGS "-Wl,-compatibility_version,${DYLIB_COMPATIBILITY_VERSION}")
list(APPEND EXTRA_LDFLAGS "-Wl,-current_version,${DYLIB_CURRENT_VERSION}")
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else()
set(CMAKE_REQUIRED_FLAGS "-Wl,--no-undefined")
check_c_compiler_flag("" HAVE_NO_UNDEFINED)
set(CMAKE_REQUIRED_FLAGS ${ORIG_CMAKE_REQUIRED_FLAGS})
if(HAVE_NO_UNDEFINED)
list(APPEND EXTRA_LDFLAGS "-Wl,--no-undefined")
endif()
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endif()
endif()
if(ASSEMBLY)
if(USE_GCC OR USE_CLANG)
set(SDL_ASSEMBLY_ROUTINES 1)
# TODO: Those all seem to be quite GCC specific - needs to be
# reworked for better compiler support
set(HAVE_ASSEMBLY TRUE)
if(MMX)
set(CMAKE_REQUIRED_FLAGS "-mmmx")
check_c_source_compiles("
#ifdef __MINGW32__
#include <_mingw.h>
#ifdef __MINGW64_VERSION_MAJOR
#include <intrin.h>
#else
#include <mmintrin.h>
#endif
#else
#include <mmintrin.h>
#endif
#ifndef __MMX__
#error Assembler CPP flag not enabled
#endif
int main(int argc, char **argv) { }" HAVE_MMX)
if(HAVE_MMX)
list(APPEND EXTRA_CFLAGS "-mmmx")
endif()
set(CMAKE_REQUIRED_FLAGS ${ORIG_CMAKE_REQUIRED_FLAGS})
endif()
if(3DNOW)
set(CMAKE_REQUIRED_FLAGS "-m3dnow")
check_c_source_compiles("
#include <mm3dnow.h>
#ifndef __3dNOW__
#error Assembler CPP flag not enabled
#endif
int main(int argc, char **argv) {
void *p = 0;
_m_prefetch(p);
}" HAVE_3DNOW)
if(HAVE_3DNOW)
list(APPEND EXTRA_CFLAGS "-m3dnow")
endif()
set(CMAKE_REQUIRED_FLAGS ${ORIG_CMAKE_REQUIRED_FLAGS})
endif()
if(SSE)
set(CMAKE_REQUIRED_FLAGS "-msse")
check_c_source_compiles("
#ifdef __MINGW32__
#include <_mingw.h>
#ifdef __MINGW64_VERSION_MAJOR
#include <intrin.h>
#else
#include <xmmintrin.h>
#endif
#else
#include <xmmintrin.h>
#endif
#ifndef __SSE__
#error Assembler CPP flag not enabled
#endif
int main(int argc, char **argv) { }" HAVE_SSE)
if(HAVE_SSE)
list(APPEND EXTRA_CFLAGS "-msse")
endif()
set(CMAKE_REQUIRED_FLAGS ${ORIG_CMAKE_REQUIRED_FLAGS})
endif()
if(SSE2)
set(CMAKE_REQUIRED_FLAGS "-msse2")
check_c_source_compiles("
#ifdef __MINGW32__
#include <_mingw.h>
#ifdef __MINGW64_VERSION_MAJOR
#include <intrin.h>
#else
#include <emmintrin.h>
#endif
#else
#include <emmintrin.h>
#endif
#ifndef __SSE2__
#error Assembler CPP flag not enabled
#endif
int main(int argc, char **argv) { }" HAVE_SSE2)
if(HAVE_SSE2)
list(APPEND EXTRA_CFLAGS "-msse2")
endif()
set(CMAKE_REQUIRED_FLAGS ${ORIG_CMAKE_REQUIRED_FLAGS})
endif()
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631
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633
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if(SSE3)
set(CMAKE_REQUIRED_FLAGS "-msse3")
check_c_source_compiles("
#ifdef __MINGW32__
#include <_mingw.h>
#ifdef __MINGW64_VERSION_MAJOR
#include <intrin.h>
#else
#include <pmmintrin.h>
#endif
#else
#include <pmmintrin.h>
#endif
#ifndef __SSE3__
#error Assembler CPP flag not enabled
#endif
int main(int argc, char **argv) { }" HAVE_SSE3)
if(HAVE_SSE3)
list(APPEND EXTRA_CFLAGS "-msse3")
endif()
set(CMAKE_REQUIRED_FLAGS ${ORIG_CMAKE_REQUIRED_FLAGS})
endif()
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645
check_c_compiler_flag(-mfpmath=387 HAVE_FP_387)
if(HAVE_FP_387)
list(APPEND EXTRA_CFLAGS "-mfpmath=387")
endif()
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endif()
set(HAVE_SSEMATH TRUE)
endif()
endif()
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check_include_file("immintrin.h" HAVE_IMMINTRIN_H)
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if(ALTIVEC)
set(CMAKE_REQUIRED_FLAGS "-maltivec")
check_c_source_compiles("
#include <altivec.h>
vector unsigned int vzero() {
return vec_splat_u32(0);
}
int main(int argc, char **argv) { }" HAVE_ALTIVEC_H_HDR)
check_c_source_compiles("
vector unsigned int vzero() {
return vec_splat_u32(0);
}
int main(int argc, char **argv) { }" HAVE_ALTIVEC)
set(CMAKE_REQUIRED_FLAGS ${ORIG_CMAKE_REQUIRED_FLAGS})
if(HAVE_ALTIVEC OR HAVE_ALTIVEC_H_HDR)
set(HAVE_ALTIVEC TRUE) # if only HAVE_ALTIVEC_H_HDR is set
list(APPEND EXTRA_CFLAGS "-maltivec")
set(SDL_ALTIVEC_BLITTERS 1)
if(HAVE_ALTIVEC_H_HDR)
set(HAVE_ALTIVEC_H 1)
endif()
endif()
endif()
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if(ARMSIMD)
set(ORIG_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -x assembler-with-cpp")
check_c_source_compiles("
.text
.arch armv6
.object_arch armv4
.arm
.altmacro
#ifndef __ARM_EABI__
#error EABI is required (to be sure that calling conventions are compatible)
#endif
pld [r0]
uqadd8 r0, r0, r0
" ARMSIMD_FOUND)
set(CMAKE_REQUIRED_FLAGS "${ORIG_CMAKE_REQUIRED_FLAGS}")
if(ARMSIMD_FOUND)
set(HAVE_ARMSIMD TRUE)
set(SDL_ARM_SIMD_BLITTERS 1)
file(GLOB ARMSIMD_SOURCES ${SDL2_SOURCE_DIR}/src/video/arm/pixman-arm-simd*.S)
set(SOURCE_FILES ${SOURCE_FILES} ${ARMSIMD_SOURCES})
set(WARN_ABOUT_ARM_SIMD_ASM_MIT TRUE)
endif()
endif()
if(ARMNEON)
set(ORIG_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -x assembler-with-cpp")
check_c_source_compiles("
.text
.fpu neon
.arch armv7a
.object_arch armv4
.eabi_attribute 10, 0
.arm
.altmacro
#ifndef __ARM_EABI__
#error EABI is required (to be sure that calling conventions are compatible)
#endif
pld [r0]
vmovn.u16 d0, q0
" ARMNEON_FOUND)
set(CMAKE_REQUIRED_FLAGS "${ORIG_CMAKE_REQUIRED_FLAGS}")
if(ARMNEON_FOUND)
set(HAVE_ARMNEON TRUE)
set(SDL_ARM_NEON_BLITTERS 1)
file(GLOB ARMNEON_SOURCES ${SDL2_SOURCE_DIR}/src/video/arm/pixman-arm-neon*.S)
set(SOURCE_FILES ${SOURCE_FILES} ${ARMNEON_SOURCES})
set(WARN_ABOUT_ARM_NEON_ASM_MIT TRUE)
endif()
endif()
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elseif(MSVC_VERSION GREATER 1500)
# TODO: SDL_cpuinfo.h needs to support the user's configuration wish
# for MSVC - right now it is always activated
if(NOT ARCH_64)
set(HAVE_MMX TRUE)
set(HAVE_3DNOW TRUE)
endif()
set(HAVE_SSE TRUE)
set(HAVE_SSE2 TRUE)
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set(SDL_ASSEMBLY_ROUTINES 1)
endif()
# TODO:
#else()
# if(USE_GCC OR USE_CLANG)
746
# list(APPEND EXTRA_CFLAGS "-mno-sse" "-mno-sse2" "-mno-sse3" "-mno-mmx")
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# endif()
endif()
# TODO: Can't deactivate on FreeBSD? w/o LIBC, SDL_stdinc.h can't define
# anything.
if(LIBC)
if(WINDOWS AND NOT MINGW)
set(HAVE_LIBC TRUE)
755
foreach(_HEADER stdio.h string.h wchar.h ctype.h math.h limits.h)
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string(TOUPPER "HAVE_${_HEADER}" _UPPER)
string(REPLACE "." "_" _HAVE_H ${_UPPER})
set(${_HAVE_H} 1)
endforeach()
set(HAVE_SIGNAL_H 1)
foreach(_FN
malloc calloc realloc free qsort abs memset memcpy memmove memcmp
763
wcslen wcslcpy wcslcat wcsdup wcsstr wcscmp wcsncmp
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strlen _strrev _strupr _strlwr strchr strrchr strstr itoa _ltoa
_ultoa strtol strtoul strtoll strtod atoi atof strcmp strncmp
767
acos acosf asin asinf atan atanf atan2 atan2f ceil ceilf
768
copysign copysignf cos cosf exp expf fabs fabsf floor floorf fmod fmodf
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log logf log10 log10f pow powf scalbn scalbnf sin sinf sqrt sqrtf tan tanf)
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string(TOUPPER ${_FN} _UPPER)
set(HAVE_${_UPPER} 1)
endforeach()
if(NOT CYGWIN AND NOT MINGW)
set(HAVE_ALLOCA 1)
endif()
set(HAVE_M_PI 1)
add_definitions(-D_USE_MATH_DEFINES) # needed for M_PI
set(STDC_HEADERS 1)
else()
set(HAVE_LIBC TRUE)
check_include_file(sys/types.h HAVE_SYS_TYPES_H)
foreach(_HEADER
783
stdio.h stdlib.h stddef.h stdarg.h malloc.h memory.h string.h limits.h
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strings.h wchar.h inttypes.h stdint.h ctype.h math.h iconv.h signal.h libunwind.h)
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string(TOUPPER "HAVE_${_HEADER}" _UPPER)
string(REPLACE "." "_" _HAVE_H ${_UPPER})
check_include_file("${_HEADER}" ${_HAVE_H})
endforeach()
check_include_files("dlfcn.h;stdint.h;stddef.h;inttypes.h;stdlib.h;strings.h;string.h;float.h" STDC_HEADERS)
check_type_size("size_t" SIZEOF_SIZE_T)
check_symbol_exists(M_PI math.h HAVE_M_PI)
# TODO: refine the mprotect check
check_c_source_compiles("#include <sys/types.h>
#include <sys/mman.h>
int main() { }" HAVE_MPROTECT)
foreach(_FN
strtod malloc calloc realloc free getenv setenv putenv unsetenv
qsort abs bcopy memset memcpy memmove memcmp strlen strlcpy strlcat
800
_strrev _strupr _strlwr strchr strrchr strstr strtok_r itoa _ltoa
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_uitoa _ultoa strtol strtoul _i64toa _ui64toa strtoll strtoull
atoi atof strcmp strncmp _stricmp strcasecmp _strnicmp strncasecmp
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wcscmp wcsdup wcslcat wcslcpy wcslen wcsncmp wcsstr
sscanf vsscanf vsnprintf fopen64 fseeko fseeko64 sigaction setjmp
805
nanosleep sysconf sysctlbyname getauxval poll _Exit
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)
string(TOUPPER ${_FN} _UPPER)
set(_HAVEVAR "HAVE_${_UPPER}")
check_function_exists("${_FN}" ${_HAVEVAR})
endforeach()
check_library_exists(m pow "" HAVE_LIBM)
if(HAVE_LIBM)
set(CMAKE_REQUIRED_LIBRARIES m)
foreach(_FN
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atan atan2 atanf atan2f ceil ceilf copysign copysignf cos cosf
exp expf fabs fabsf floor floorf fmod fmodf log logf log10 log10f
pow powf scalbn scalbnf sin sinf sqrt sqrtf tan tanf acos acosf
asin asinf)
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839
840
841
842
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string(TOUPPER ${_FN} _UPPER)
set(_HAVEVAR "HAVE_${_UPPER}")
check_function_exists("${_FN}" ${_HAVEVAR})
endforeach()
set(CMAKE_REQUIRED_LIBRARIES)
list(APPEND EXTRA_LIBS m)
endif()
check_library_exists(iconv iconv_open "" HAVE_LIBICONV)
if(HAVE_LIBICONV)
list(APPEND EXTRA_LIBS iconv)
set(HAVE_ICONV 1)
endif()
if(NOT APPLE)
check_include_file(alloca.h HAVE_ALLOCA_H)
check_function_exists(alloca HAVE_ALLOCA)
else()
set(HAVE_ALLOCA_H 1)
set(HAVE_ALLOCA 1)
endif()
check_struct_has_member("struct sigaction" "sa_sigaction" "signal.h" HAVE_SA_SIGACTION)
endif()
else()
if(WINDOWS)
set(HAVE_STDARG_H 1)
set(HAVE_STDDEF_H 1)
endif()
endif()
# Enable/disable various subsystems of the SDL library
foreach(_SUB ${SDL_SUBSYSTEMS})
string(TOUPPER ${_SUB} _OPT)
if(NOT SDL_${_OPT})
set(SDL_${_OPT}_DISABLED 1)
endif()
endforeach()
if(SDL_JOYSTICK)
file(GLOB JOYSTICK_SOURCES ${SDL2_SOURCE_DIR}/src/joystick/*.c)
set(SOURCE_FILES ${SOURCE_FILES} ${JOYSTICK_SOURCES})
endif()
if(SDL_HAPTIC)
if(NOT SDL_JOYSTICK)
# Haptic requires some private functions from the joystick subsystem.
message_error("SDL_HAPTIC requires SDL_JOYSTICK, which is not enabled")
endif()
file(GLOB HAPTIC_SOURCES ${SDL2_SOURCE_DIR}/src/haptic/*.c)
set(SOURCE_FILES ${SOURCE_FILES} ${HAPTIC_SOURCES})
endif()
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if(SDL_SENSOR)
file(GLOB SENSOR_SOURCES ${SDL2_SOURCE_DIR}/src/sensor/*.c)
set(SOURCE_FILES ${SOURCE_FILES} ${SENSOR_SOURCES})
endif()
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878
if(SDL_POWER)
file(GLOB POWER_SOURCES ${SDL2_SOURCE_DIR}/src/power/*.c)
set(SOURCE_FILES ${SOURCE_FILES} ${POWER_SOURCES})
endif()
879
# TODO: in configure.ac, the test for LOADSO and SDL_DLOPEN is a bit weird:
880
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# if LOADSO is not wanted, SDL_LOADSO_DISABLED is set
# If however on Unix or APPLE dlopen() is detected via CheckDLOPEN(),
# SDL_LOADSO_DISABLED will not be set, regardless of the LOADSO settings
# General SDL subsystem options, valid for all platforms
if(SDL_AUDIO)
# CheckDummyAudio/CheckDiskAudio - valid for all platforms
if(DUMMYAUDIO)
set(SDL_AUDIO_DRIVER_DUMMY 1)
file(GLOB DUMMYAUDIO_SOURCES ${SDL2_SOURCE_DIR}/src/audio/dummy/*.c)
set(SOURCE_FILES ${SOURCE_FILES} ${DUMMYAUDIO_SOURCES})
set(HAVE_DUMMYAUDIO TRUE)
endif()
if(DISKAUDIO)
set(SDL_AUDIO_DRIVER_DISK 1)
file(GLOB DISKAUDIO_SOURCES ${SDL2_SOURCE_DIR}/src/audio/disk/*.c)
set(SOURCE_FILES ${SOURCE_FILES} ${DISKAUDIO_SOURCES})
set(HAVE_DISKAUDIO TRUE)
endif()
endif()
if(SDL_DLOPEN)
# Relevant for Unix/Darwin only
if(UNIX OR APPLE)
CheckDLOPEN()
endif()
endif()
if(SDL_VIDEO)
if(VIDEO_DUMMY)
set(SDL_VIDEO_DRIVER_DUMMY 1)
file(GLOB VIDEO_DUMMY_SOURCES ${SDL2_SOURCE_DIR}/src/video/dummy/*.c)
set(SOURCE_FILES ${SOURCE_FILES} ${VIDEO_DUMMY_SOURCES})
set(HAVE_VIDEO_DUMMY TRUE)
set(HAVE_SDL_VIDEO TRUE)
endif()
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922
if(VIDEO_OFFSCREEN)
set(SDL_VIDEO_DRIVER_OFFSCREEN 1)
file(GLOB VIDEO_OFFSCREEN_SOURCES ${SDL2_SOURCE_DIR}/src/video/offscreen/*.c)
set(SOURCE_FILES ${SOURCE_FILES} ${VIDEO_OFFSCREEN_SOURCES})
set(HAVE_VIDEO_OFFSCREEN TRUE)
set(HAVE_SDL_VIDEO TRUE)
endif()
925
# Platform-specific options and settings
926
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if(ANDROID)
file(GLOB ANDROID_CORE_SOURCES ${SDL2_SOURCE_DIR}/src/core/android/*.c)
set(SOURCE_FILES ${SOURCE_FILES} ${ANDROID_CORE_SOURCES})
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937
938
# SDL_spinlock.c Needs to be compiled in ARM mode.
# There seems to be no better way currently to set the ARM mode.
# see: https://issuetracker.google.com/issues/62264618
# Another option would be to set ARM mode to all compiled files
check_c_compiler_flag(-marm HAVE_ARM_MODE)
if(HAVE_ARM_MODE)
set_source_files_properties(${SDL2_SOURCE_DIR}/src/atomic/SDL_spinlock.c PROPERTIES COMPILE_FLAGS -marm)
endif()
939
file(GLOB ANDROID_MAIN_SOURCES ${SDL2_SOURCE_DIR}/src/main/android/*.c)
940
941
set(SDLMAIN_SOURCES ${SDLMAIN_SOURCES} ${ANDROID_MAIN_SOURCES})
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952
953
if(SDL_AUDIO)
set(SDL_AUDIO_DRIVER_ANDROID 1)
file(GLOB ANDROID_AUDIO_SOURCES ${SDL2_SOURCE_DIR}/src/audio/android/*.c)
set(SOURCE_FILES ${SOURCE_FILES} ${ANDROID_AUDIO_SOURCES})
set(HAVE_SDL_AUDIO TRUE)
endif()
if(SDL_FILESYSTEM)
set(SDL_FILESYSTEM_ANDROID 1)
file(GLOB ANDROID_FILESYSTEM_SOURCES ${SDL2_SOURCE_DIR}/src/filesystem/android/*.c)
set(SOURCE_FILES ${SOURCE_FILES} ${ANDROID_FILESYSTEM_SOURCES})
set(HAVE_SDL_FILESYSTEM TRUE)
endif()
954
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956
957
958
959
if(SDL_HAPTIC)
set(SDL_HAPTIC_ANDROID 1)
file(GLOB ANDROID_HAPTIC_SOURCES ${SDL2_SOURCE_DIR}/src/haptic/android/*.c)
set(SOURCE_FILES ${SOURCE_FILES} ${ANDROID_HAPTIC_SOURCES})
set(HAVE_SDL_HAPTIC TRUE)
endif()
963
file(GLOB ANDROID_JOYSTICK_SOURCES ${SDL2_SOURCE_DIR}/src/joystick/android/*.c ${SDL2_SOURCE_DIR}/src/joystick/steam/*.c)
964
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966
set(SOURCE_FILES ${SOURCE_FILES} ${ANDROID_JOYSTICK_SOURCES})
set(HAVE_SDL_JOYSTICK TRUE)
endif()
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969
970
971
972
if(SDL_LOADSO)
set(SDL_LOADSO_DLOPEN 1)
file(GLOB LOADSO_SOURCES ${SDL2_SOURCE_DIR}/src/loadso/dlopen/*.c)
set(SOURCE_FILES ${SOURCE_FILES} ${LOADSO_SOURCES})
set(HAVE_SDL_LOADSO TRUE)
endif()
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977
978
if(SDL_POWER)
set(SDL_POWER_ANDROID 1)
file(GLOB ANDROID_POWER_SOURCES ${SDL2_SOURCE_DIR}/src/power/android/*.c)
set(SOURCE_FILES ${SOURCE_FILES} ${ANDROID_POWER_SOURCES})
set(HAVE_SDL_POWER TRUE)
endif()
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980
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982
983
984
if(SDL_TIMERS)
set(SDL_TIMER_UNIX 1)
file(GLOB TIMER_SOURCES ${SDL2_SOURCE_DIR}/src/timer/unix/*.c)
set(SOURCE_FILES ${SOURCE_FILES} ${TIMER_SOURCES})
set(HAVE_SDL_TIMERS TRUE)
endif()
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989
990
if(SDL_SENSOR)
set(SDL_SENSOR_ANDROID 1)
set(HAVE_SDL_SENSORS TRUE)
file(GLOB ANDROID_SENSOR_SOURCES ${SDL2_SOURCE_DIR}/src/sensor/android/*.c)
set(SOURCE_FILES ${SOURCE_FILES} ${ANDROID_SENSOR_SOURCES})
endif()
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if(SDL_VIDEO)
set(SDL_VIDEO_DRIVER_ANDROID 1)
file(GLOB ANDROID_VIDEO_SOURCES ${SDL2_SOURCE_DIR}/src/video/android/*.c)
set(SOURCE_FILES ${SOURCE_FILES} ${ANDROID_VIDEO_SOURCES})
set(HAVE_SDL_VIDEO TRUE)
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# find_library(ANDROID_DL_LIBRARY dl)
# FIXME failing dlopen https://github.com/android-ndk/ndk/issues/929
find_library(ANDROID_DL_LIBRARY NAMES libdl.so dl)