cmake/iOS.cmake - platform/external/pytorch - Git at Google

 # This file is based off of the Platform/Darwin.cmake and Platform/UnixPaths.cmake
 # files which are included with CMake 2.8.4
 # It has been altered for iOS development

 # Options:
 #
 # IOS_PLATFORM = OS (default) or SIMULATOR
 #   This decides if SDKS will be selected from the iPhoneOS.platform or iPhoneSimulator.platform folders
 #   OS - the default, used to build for iPhone and iPad physical devices, which have an arm arch.
 #   SIMULATOR - used to build for the Simulator platforms, which have an x86 arch.
 #
 # CMAKE_IOS_DEVELOPER_ROOT = automatic(default) or /path/to/platform/Developer folder
 #   By default this location is automatcially chosen based on the IOS_PLATFORM value above.
 #   If set manually, it will override the default location and force the user of a particular Developer Platform
 #
 # CMAKE_IOS_SDK_ROOT = automatic(default) or /path/to/platform/Developer/SDKs/SDK folder
 #   By default this location is automatcially chosen based on the CMAKE_IOS_DEVELOPER_ROOT value.
 #   In this case it will always be the most up-to-date SDK found in the CMAKE_IOS_DEVELOPER_ROOT path.
 #   If set manually, this will force the use of a specific SDK version

 # Macros:
 #
 # set_xcode_property (TARGET XCODE_PROPERTY XCODE_VALUE)
 #  A convenience macro for setting xcode specific properties on targets
 #  example: set_xcode_property (myioslib IPHONEOS_DEPLOYMENT_TARGET "3.1")
 #
 # find_host_package (PROGRAM ARGS)
 #  A macro used to find executable programs on the host system, not within the iOS environment.
 #  Thanks to the android-cmake project for providing the command

 # Standard settings
 set(CMAKE_SYSTEM_NAME Darwin)
 set(CMAKE_SYSTEM_VERSION 1)
 set(UNIX True)
 set(APPLE True)
 set(IOS True)

 # Required as of cmake 2.8.10
 set(CMAKE_OSX_DEPLOYMENT_TARGET "" CACHE STRING "Force unset of the deployment target for iOS" FORCE)

 # Determine the cmake host system version so we know where to find the iOS SDKs
 find_program(CMAKE_UNAME uname /bin /usr/bin /usr/local/bin)
 if(CMAKE_UNAME)
     exec_program(uname ARGS -r OUTPUT_VARIABLE CMAKE_HOST_SYSTEM_VERSION)
     string(REGEX REPLACE "^([0-9]+)\\.([0-9]+).*$" "\\1" DARWIN_MAJOR_VERSION "${CMAKE_HOST_SYSTEM_VERSION}")
 endif(CMAKE_UNAME)

 # Force the compilers to gcc for iOS
 set(CMAKE_C_COMPILER /usr/bin/gcc CACHE STRING "")
 set(CMAKE_CXX_COMPILER /usr/bin/g++ CACHE STRING "")
 set(CMAKE_AR ar CACHE FILEPATH "" FORCE)
 set(CMAKE_RANLIB ranlib CACHE FILEPATH "" FORCE)
 set(PKG_CONFIG_EXECUTABLE pkg-config CACHE FILEPATH "" FORCE)

 # Setup iOS platform unless specified manually with IOS_PLATFORM
 if(NOT DEFINED IOS_PLATFORM)
     set(IOS_PLATFORM "OS")
 endif(NOT DEFINED IOS_PLATFORM)
 set(IOS_PLATFORM ${IOS_PLATFORM} CACHE STRING "Type of iOS Platform")

 # Check the platform selection and setup for developer root
 if(${IOS_PLATFORM} STREQUAL "OS")
     set(IOS_PLATFORM_LOCATION "iPhoneOS.platform")
     set(XCODE_IOS_PLATFORM iphoneos)

     # This causes the installers to properly locate the output libraries
     set(CMAKE_XCODE_EFFECTIVE_PLATFORMS "-iphoneos")
 elseif(${IOS_PLATFORM} STREQUAL "SIMULATOR")
     set(IOS_PLATFORM_LOCATION "iPhoneSimulator.platform")
     set(XCODE_IOS_PLATFORM iphonesimulator)

     # This causes the installers to properly locate the output libraries
     set(CMAKE_XCODE_EFFECTIVE_PLATFORMS "-iphonesimulator")
 elseif(${IOS_PLATFORM} STREQUAL "WATCHOS")
     set(IOS_PLATFORM_LOCATION "WatchOS.platform")
     set(XCODE_IOS_PLATFORM watchos)

     # This causes the installers to properly locate the output libraries
     set(CMAKE_XCODE_EFFECTIVE_PLATFORMS "-watchos")
 else(${IOS_PLATFORM} STREQUAL "OS")
     message(FATAL_ERROR
             "Unsupported IOS_PLATFORM value selected. "
             "Please choose OS, SIMULATOR, or WATCHOS.")
 endif()

 # All iOS/Darwin specific settings - some may be redundant
 set(CMAKE_SHARED_LIBRARY_PREFIX "lib")
 set(CMAKE_SHARED_LIBRARY_SUFFIX ".dylib")
 set(CMAKE_SHARED_MODULE_PREFIX "lib")
 set(CMAKE_SHARED_MODULE_SUFFIX ".so")
 set(CMAKE_MODULE_EXISTS 1)
 set(CMAKE_DL_LIBS "")

 set(CMAKE_C_OSX_COMPATIBILITY_VERSION_FLAG "-compatibility_version ")
 set(CMAKE_C_OSX_CURRENT_VERSION_FLAG "-current_version ")
 set(CMAKE_CXX_OSX_COMPATIBILITY_VERSION_FLAG "${CMAKE_C_OSX_COMPATIBILITY_VERSION_FLAG}")
 set(CMAKE_CXX_OSX_CURRENT_VERSION_FLAG "${CMAKE_C_OSX_CURRENT_VERSION_FLAG}")

 if(IOS_DEPLOYMENT_TARGET)
   set(XCODE_IOS_PLATFORM_VERSION_FLAGS "-m${XCODE_IOS_PLATFORM}-version-min=${IOS_DEPLOYMENT_TARGET}")
 endif()

 # Hidden visibilty is required for cxx on iOS
 set(CMAKE_C_FLAGS_INIT "${XCODE_IOS_PLATFORM_VERSION_FLAGS}")
 set(CMAKE_CXX_FLAGS_INIT "${XCODE_IOS_PLATFORM_VERSION_FLAGS} -fvisibility-inlines-hidden")

 set(CMAKE_C_LINK_FLAGS "${XCODE_IOS_PLATFORM_VERSION_FLAGS} -Wl,-search_paths_first ${CMAKE_C_LINK_FLAGS}")
 set(CMAKE_CXX_LINK_FLAGS "${XCODE_IOS_PLATFORM_VERSION_FLAGS} -Wl,-search_paths_first ${CMAKE_CXX_LINK_FLAGS}")

 set(CMAKE_PLATFORM_HAS_INSTALLNAME 1)
 set(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-dynamiclib -headerpad_max_install_names")
 set(CMAKE_SHARED_MODULE_CREATE_C_FLAGS "-bundle -headerpad_max_install_names")
 set(CMAKE_SHARED_MODULE_LOADER_C_FLAG "-Wl,-bundle_loader,")
 set(CMAKE_SHARED_MODULE_LOADER_CXX_FLAG "-Wl,-bundle_loader,")
 set(CMAKE_FIND_LIBRARY_SUFFIXES ".dylib" ".so" ".a")

 # hack: if a new cmake (which uses CMAKE_INSTALL_NAME_TOOL) runs on an old build tree
 # (where install_name_tool was hardcoded) and where CMAKE_INSTALL_NAME_TOOL isn't in the cache
 # and still cmake didn't fail in CMakeFindBinUtils.cmake (because it isn't rerun)
 # hardcode CMAKE_INSTALL_NAME_TOOL here to install_name_tool, so it behaves as it did before, Alex
 if(NOT DEFINED CMAKE_INSTALL_NAME_TOOL)
     find_program(CMAKE_INSTALL_NAME_TOOL install_name_tool)
 endif(NOT DEFINED CMAKE_INSTALL_NAME_TOOL)

 # Setup iOS deployment target
 set(IOS_DEPLOYMENT_TARGET ${IOS_DEPLOYMENT_TARGET} CACHE STRING "Minimum iOS version")

 # Setup iOS developer location unless specified manually with CMAKE_IOS_DEVELOPER_ROOT
 # Note Xcode 4.3 changed the installation location, choose the most recent one available
 exec_program(/usr/bin/xcode-select ARGS -print-path OUTPUT_VARIABLE CMAKE_XCODE_DEVELOPER_DIR)
 set(XCODE_POST_43_ROOT "${CMAKE_XCODE_DEVELOPER_DIR}/Platforms/${IOS_PLATFORM_LOCATION}/Developer")
 set(XCODE_PRE_43_ROOT "/Developer/Platforms/${IOS_PLATFORM_LOCATION}/Developer")
 if(NOT DEFINED CMAKE_IOS_DEVELOPER_ROOT)
     if(EXISTS ${XCODE_POST_43_ROOT})
         set(CMAKE_IOS_DEVELOPER_ROOT ${XCODE_POST_43_ROOT})
     elseif(EXISTS ${XCODE_PRE_43_ROOT})
         set(CMAKE_IOS_DEVELOPER_ROOT ${XCODE_PRE_43_ROOT})
     endif(EXISTS ${XCODE_POST_43_ROOT})
 endif(NOT DEFINED CMAKE_IOS_DEVELOPER_ROOT)
 set(CMAKE_IOS_DEVELOPER_ROOT ${CMAKE_IOS_DEVELOPER_ROOT} CACHE PATH "Location of iOS Platform")

 # Find and use the most recent iOS sdk unless specified manually with CMAKE_IOS_SDK_ROOT
 if(NOT DEFINED CMAKE_IOS_SDK_ROOT)
     file(GLOB _CMAKE_IOS_SDKS "${CMAKE_IOS_DEVELOPER_ROOT}/SDKs/*")
     if(_CMAKE_IOS_SDKS)
         list(SORT _CMAKE_IOS_SDKS)
         list(REVERSE _CMAKE_IOS_SDKS)
         list(GET _CMAKE_IOS_SDKS 0 CMAKE_IOS_SDK_ROOT)
     else(_CMAKE_IOS_SDKS)
         message(FATAL_ERROR "No iOS SDK's found in default search path ${CMAKE_IOS_DEVELOPER_ROOT}. Manually set CMAKE_IOS_SDK_ROOT or install the iOS SDK.")
     endif(_CMAKE_IOS_SDKS)
     message(STATUS "Toolchain using default iOS SDK: ${CMAKE_IOS_SDK_ROOT}")
 endif(NOT DEFINED CMAKE_IOS_SDK_ROOT)
 set(CMAKE_IOS_SDK_ROOT ${CMAKE_IOS_SDK_ROOT} CACHE PATH "Location of the selected iOS SDK")

 # Set the sysroot default to the most recent SDK
 set(CMAKE_OSX_SYSROOT ${CMAKE_IOS_SDK_ROOT} CACHE PATH "Sysroot used for iOS support")

 # set the architecture for iOS
 if(IOS_PLATFORM STREQUAL "OS")
     set(DEFAULT_IOS_ARCH "arm64")
 elseif(IOS_PLATFORM STREQUAL "SIMULATOR")
     set(DEFAULT_IOS_ARCH "x86_64")
 elseif(IOS_PLATFORM STREQUAL "WATCHOS")
     set(DEFAULT_IOS_ARCH "armv7k;arm64_32")
 endif()

 set(IOS_ARCH ${DEFAULT_IOS_ARCH} CACHE string  "Build architecture for iOS")
 set(CMAKE_OSX_ARCHITECTURES ${IOS_ARCH} CACHE string  "Build architecture for iOS")

 # Set the find root to the iOS developer roots and to user defined paths
 set(CMAKE_FIND_ROOT_PATH ${CMAKE_IOS_DEVELOPER_ROOT} ${CMAKE_IOS_SDK_ROOT} ${CMAKE_PREFIX_PATH} CACHE string  "iOS find search path root")

 # default to searching for frameworks first
 set(CMAKE_FIND_FRAMEWORK FIRST)

 # set up the default search directories for frameworks
 set(CMAKE_SYSTEM_FRAMEWORK_PATH
     ${CMAKE_IOS_SDK_ROOT}/System/Library/Frameworks
     ${CMAKE_IOS_SDK_ROOT}/System/Library/PrivateFrameworks
     ${CMAKE_IOS_SDK_ROOT}/Developer/Library/Frameworks
 )

 # only search the iOS sdks, not the remainder of the host filesystem
 set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY)
 set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
 set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

 # This little macro lets you set any XCode specific property
 macro(set_xcode_property TARGET XCODE_PROPERTY XCODE_VALUE)
     set_property(TARGET ${TARGET} PROPERTY XCODE_ATTRIBUTE_${XCODE_PROPERTY} ${XCODE_VALUE})
 endmacro(set_xcode_property)

 # This macro lets you find executable programs on the host system
 macro(find_host_package)
     set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
     set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY NEVER)
     set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE NEVER)
     set(IOS FALSE)

     find_package(${ARGN})

     set(IOS TRUE)
     set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY)
     set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
     set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
 endmacro(find_host_package)
	# This file is based off of the Platform/Darwin.cmake and Platform/UnixPaths.cmake
	# files which are included with CMake 2.8.4
	# It has been altered for iOS development

	# Options:
	#
	# IOS_PLATFORM = OS (default) or SIMULATOR
	# This decides if SDKS will be selected from the iPhoneOS.platform or iPhoneSimulator.platform folders
	# OS - the default, used to build for iPhone and iPad physical devices, which have an arm arch.
	# SIMULATOR - used to build for the Simulator platforms, which have an x86 arch.
	#
	# CMAKE_IOS_DEVELOPER_ROOT = automatic(default) or /path/to/platform/Developer folder
	# By default this location is automatcially chosen based on the IOS_PLATFORM value above.
	# If set manually, it will override the default location and force the user of a particular Developer Platform
	#
	# CMAKE_IOS_SDK_ROOT = automatic(default) or /path/to/platform/Developer/SDKs/SDK folder
	# By default this location is automatcially chosen based on the CMAKE_IOS_DEVELOPER_ROOT value.
	# In this case it will always be the most up-to-date SDK found in the CMAKE_IOS_DEVELOPER_ROOT path.
	# If set manually, this will force the use of a specific SDK version

	# Macros:
	#
	# set_xcode_property (TARGET XCODE_PROPERTY XCODE_VALUE)
	# A convenience macro for setting xcode specific properties on targets
	# example: set_xcode_property (myioslib IPHONEOS_DEPLOYMENT_TARGET "3.1")
	#
	# find_host_package (PROGRAM ARGS)
	# A macro used to find executable programs on the host system, not within the iOS environment.
	# Thanks to the android-cmake project for providing the command

	# Standard settings
	set(CMAKE_SYSTEM_NAME Darwin)
	set(CMAKE_SYSTEM_VERSION 1)
	set(UNIX True)
	set(APPLE True)
	set(IOS True)

	# Required as of cmake 2.8.10
	set(CMAKE_OSX_DEPLOYMENT_TARGET "" CACHE STRING "Force unset of the deployment target for iOS" FORCE)

	# Determine the cmake host system version so we know where to find the iOS SDKs
	find_program(CMAKE_UNAME uname /bin /usr/bin /usr/local/bin)
	if(CMAKE_UNAME)
	exec_program(uname ARGS -r OUTPUT_VARIABLE CMAKE_HOST_SYSTEM_VERSION)
	string(REGEX REPLACE "^([0-9]+)\\.([0-9]+).*$" "\\1" DARWIN_MAJOR_VERSION "${CMAKE_HOST_SYSTEM_VERSION}")
	endif(CMAKE_UNAME)

	# Force the compilers to gcc for iOS
	set(CMAKE_C_COMPILER /usr/bin/gcc CACHE STRING "")
	set(CMAKE_CXX_COMPILER /usr/bin/g++ CACHE STRING "")
	set(CMAKE_AR ar CACHE FILEPATH "" FORCE)
	set(CMAKE_RANLIB ranlib CACHE FILEPATH "" FORCE)
	set(PKG_CONFIG_EXECUTABLE pkg-config CACHE FILEPATH "" FORCE)

	# Setup iOS platform unless specified manually with IOS_PLATFORM
	if(NOT DEFINED IOS_PLATFORM)
	set(IOS_PLATFORM "OS")
	endif(NOT DEFINED IOS_PLATFORM)
	set(IOS_PLATFORM ${IOS_PLATFORM} CACHE STRING "Type of iOS Platform")

	# Check the platform selection and setup for developer root
	if(${IOS_PLATFORM} STREQUAL "OS")
	set(IOS_PLATFORM_LOCATION "iPhoneOS.platform")
	set(XCODE_IOS_PLATFORM iphoneos)

	# This causes the installers to properly locate the output libraries
	set(CMAKE_XCODE_EFFECTIVE_PLATFORMS "-iphoneos")
	elseif(${IOS_PLATFORM} STREQUAL "SIMULATOR")
	set(IOS_PLATFORM_LOCATION "iPhoneSimulator.platform")
	set(XCODE_IOS_PLATFORM iphonesimulator)

	# This causes the installers to properly locate the output libraries
	set(CMAKE_XCODE_EFFECTIVE_PLATFORMS "-iphonesimulator")
	elseif(${IOS_PLATFORM} STREQUAL "WATCHOS")
	set(IOS_PLATFORM_LOCATION "WatchOS.platform")
	set(XCODE_IOS_PLATFORM watchos)

	# This causes the installers to properly locate the output libraries
	set(CMAKE_XCODE_EFFECTIVE_PLATFORMS "-watchos")
	else(${IOS_PLATFORM} STREQUAL "OS")
	message(FATAL_ERROR
	"Unsupported IOS_PLATFORM value selected. "
	"Please choose OS, SIMULATOR, or WATCHOS.")
	endif()

	# All iOS/Darwin specific settings - some may be redundant
	set(CMAKE_SHARED_LIBRARY_PREFIX "lib")
	set(CMAKE_SHARED_LIBRARY_SUFFIX ".dylib")
	set(CMAKE_SHARED_MODULE_PREFIX "lib")
	set(CMAKE_SHARED_MODULE_SUFFIX ".so")
	set(CMAKE_MODULE_EXISTS 1)
	set(CMAKE_DL_LIBS "")

	set(CMAKE_C_OSX_COMPATIBILITY_VERSION_FLAG "-compatibility_version ")
	set(CMAKE_C_OSX_CURRENT_VERSION_FLAG "-current_version ")
	set(CMAKE_CXX_OSX_COMPATIBILITY_VERSION_FLAG "${CMAKE_C_OSX_COMPATIBILITY_VERSION_FLAG}")
	set(CMAKE_CXX_OSX_CURRENT_VERSION_FLAG "${CMAKE_C_OSX_CURRENT_VERSION_FLAG}")

	if(IOS_DEPLOYMENT_TARGET)
	set(XCODE_IOS_PLATFORM_VERSION_FLAGS "-m${XCODE_IOS_PLATFORM}-version-min=${IOS_DEPLOYMENT_TARGET}")
	endif()

	# Hidden visibilty is required for cxx on iOS
	set(CMAKE_C_FLAGS_INIT "${XCODE_IOS_PLATFORM_VERSION_FLAGS}")
	set(CMAKE_CXX_FLAGS_INIT "${XCODE_IOS_PLATFORM_VERSION_FLAGS} -fvisibility-inlines-hidden")

	set(CMAKE_C_LINK_FLAGS "${XCODE_IOS_PLATFORM_VERSION_FLAGS} -Wl,-search_paths_first ${CMAKE_C_LINK_FLAGS}")
	set(CMAKE_CXX_LINK_FLAGS "${XCODE_IOS_PLATFORM_VERSION_FLAGS} -Wl,-search_paths_first ${CMAKE_CXX_LINK_FLAGS}")

	set(CMAKE_PLATFORM_HAS_INSTALLNAME 1)
	set(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-dynamiclib -headerpad_max_install_names")
	set(CMAKE_SHARED_MODULE_CREATE_C_FLAGS "-bundle -headerpad_max_install_names")
	set(CMAKE_SHARED_MODULE_LOADER_C_FLAG "-Wl,-bundle_loader,")
	set(CMAKE_SHARED_MODULE_LOADER_CXX_FLAG "-Wl,-bundle_loader,")
	set(CMAKE_FIND_LIBRARY_SUFFIXES ".dylib" ".so" ".a")

	# hack: if a new cmake (which uses CMAKE_INSTALL_NAME_TOOL) runs on an old build tree
	# (where install_name_tool was hardcoded) and where CMAKE_INSTALL_NAME_TOOL isn't in the cache
	# and still cmake didn't fail in CMakeFindBinUtils.cmake (because it isn't rerun)
	# hardcode CMAKE_INSTALL_NAME_TOOL here to install_name_tool, so it behaves as it did before, Alex
	if(NOT DEFINED CMAKE_INSTALL_NAME_TOOL)
	find_program(CMAKE_INSTALL_NAME_TOOL install_name_tool)
	endif(NOT DEFINED CMAKE_INSTALL_NAME_TOOL)

	# Setup iOS deployment target
	set(IOS_DEPLOYMENT_TARGET ${IOS_DEPLOYMENT_TARGET} CACHE STRING "Minimum iOS version")

	# Setup iOS developer location unless specified manually with CMAKE_IOS_DEVELOPER_ROOT
	# Note Xcode 4.3 changed the installation location, choose the most recent one available
	exec_program(/usr/bin/xcode-select ARGS -print-path OUTPUT_VARIABLE CMAKE_XCODE_DEVELOPER_DIR)
	set(XCODE_POST_43_ROOT "${CMAKE_XCODE_DEVELOPER_DIR}/Platforms/${IOS_PLATFORM_LOCATION}/Developer")
	set(XCODE_PRE_43_ROOT "/Developer/Platforms/${IOS_PLATFORM_LOCATION}/Developer")
	if(NOT DEFINED CMAKE_IOS_DEVELOPER_ROOT)
	if(EXISTS ${XCODE_POST_43_ROOT})
	set(CMAKE_IOS_DEVELOPER_ROOT ${XCODE_POST_43_ROOT})
	elseif(EXISTS ${XCODE_PRE_43_ROOT})
	set(CMAKE_IOS_DEVELOPER_ROOT ${XCODE_PRE_43_ROOT})
	endif(EXISTS ${XCODE_POST_43_ROOT})
	endif(NOT DEFINED CMAKE_IOS_DEVELOPER_ROOT)
	set(CMAKE_IOS_DEVELOPER_ROOT ${CMAKE_IOS_DEVELOPER_ROOT} CACHE PATH "Location of iOS Platform")

	# Find and use the most recent iOS sdk unless specified manually with CMAKE_IOS_SDK_ROOT
	if(NOT DEFINED CMAKE_IOS_SDK_ROOT)
	file(GLOB _CMAKE_IOS_SDKS "${CMAKE_IOS_DEVELOPER_ROOT}/SDKs/*")
	if(_CMAKE_IOS_SDKS)
	list(SORT _CMAKE_IOS_SDKS)
	list(REVERSE _CMAKE_IOS_SDKS)
	list(GET _CMAKE_IOS_SDKS 0 CMAKE_IOS_SDK_ROOT)
	else(_CMAKE_IOS_SDKS)
	message(FATAL_ERROR "No iOS SDK's found in default search path ${CMAKE_IOS_DEVELOPER_ROOT}. Manually set CMAKE_IOS_SDK_ROOT or install the iOS SDK.")
	endif(_CMAKE_IOS_SDKS)
	message(STATUS "Toolchain using default iOS SDK: ${CMAKE_IOS_SDK_ROOT}")
	endif(NOT DEFINED CMAKE_IOS_SDK_ROOT)
	set(CMAKE_IOS_SDK_ROOT ${CMAKE_IOS_SDK_ROOT} CACHE PATH "Location of the selected iOS SDK")

	# Set the sysroot default to the most recent SDK
	set(CMAKE_OSX_SYSROOT ${CMAKE_IOS_SDK_ROOT} CACHE PATH "Sysroot used for iOS support")

	# set the architecture for iOS
	if(IOS_PLATFORM STREQUAL "OS")
	set(DEFAULT_IOS_ARCH "arm64")
	elseif(IOS_PLATFORM STREQUAL "SIMULATOR")
	set(DEFAULT_IOS_ARCH "x86_64")
	elseif(IOS_PLATFORM STREQUAL "WATCHOS")
	set(DEFAULT_IOS_ARCH "armv7k;arm64_32")
	endif()

	set(IOS_ARCH ${DEFAULT_IOS_ARCH} CACHE string "Build architecture for iOS")
	set(CMAKE_OSX_ARCHITECTURES ${IOS_ARCH} CACHE string "Build architecture for iOS")

	# Set the find root to the iOS developer roots and to user defined paths
	set(CMAKE_FIND_ROOT_PATH ${CMAKE_IOS_DEVELOPER_ROOT} ${CMAKE_IOS_SDK_ROOT} ${CMAKE_PREFIX_PATH} CACHE string "iOS find search path root")

	# default to searching for frameworks first
	set(CMAKE_FIND_FRAMEWORK FIRST)

	# set up the default search directories for frameworks
	set(CMAKE_SYSTEM_FRAMEWORK_PATH
	${CMAKE_IOS_SDK_ROOT}/System/Library/Frameworks
	${CMAKE_IOS_SDK_ROOT}/System/Library/PrivateFrameworks
	${CMAKE_IOS_SDK_ROOT}/Developer/Library/Frameworks
	)

	# only search the iOS sdks, not the remainder of the host filesystem
	set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY)
	set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
	set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

	# This little macro lets you set any XCode specific property
	macro(set_xcode_property TARGET XCODE_PROPERTY XCODE_VALUE)
	set_property(TARGET ${TARGET} PROPERTY XCODE_ATTRIBUTE_${XCODE_PROPERTY} ${XCODE_VALUE})
	endmacro(set_xcode_property)

	# This macro lets you find executable programs on the host system
	macro(find_host_package)
	set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
	set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY NEVER)
	set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE NEVER)
	set(IOS FALSE)

	find_package(${ARGN})

	set(IOS TRUE)
	set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY)
	set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
	set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
	endmacro(find_host_package)