ios.toolchain.cmake

# This file is part of the ios-cmake project. It was retrieved from
# https://github.com/gerstrong/ios-cmake.git which is a fork of
# https://github.com/cristeab/ios-cmake.git, which again is a fork of
# https://code.google.com/p/ios-cmake/. Which in turn is based off of
# the Platform/Darwin.cmake and Platform/UnixPaths.cmake files which
# are included with CMake 2.8.4
#
# The ios-cmake project is licensed under the new BSD license.
#
# Copyright (c) 2014, Bogdan Cristea and LTE Engineering Software,
# Kitware, Inc., Insight Software Consortium.  All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# 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.
#
# Updated by Alex Stewart (alexs.mac@gmail.com)
#
# *****************************************************************************
#      Now maintained by Alexander Widerberg (widerbergaren [at] gmail.com)
#                      under the BSD-3-Clause license
#                   https://github.com/leetal/ios-cmake
# *****************************************************************************
#
#                           INFORMATION / HELP
#
# The following arguments control the behaviour of this toolchain:
#
# PLATFORM: (default "OS")
#    OS = Build for iPhoneOS.
#    OS64 = Build for arm64 iphoneOS.
#    OS64COMBINED = Build for arm64 x86_64 iphoneOS. Combined into FAT STATIC lib (supported on 3.14+ of CMakewith "-G Xcode" argument ONLY)
#    SIMULATOR = Build for x86 i386 iphoneOS Simulator.
#    SIMULATOR64 = Build for x86_64 iphoneOS Simulator.
#    SIMULATORARM64 = Build for arm64 iphoneOS Simulator.
#    TVOS = Build for arm64 tvOS.
#    TVOSCOMBINED = Build for arm64 x86_64 tvOS. Combined into FAT STATIC lib (supported on 3.14+ of CMake with "-G Xcode" argument ONLY)
#    SIMULATOR_TVOS = Build for x86_64 tvOS Simulator.
#    WATCHOS = Build for armv7k arm64_32 for watchOS.
#    WATCHOSCOMBINED = Build for armv7k arm64_32 x86_64 watchOS. Combined into FAT STATIC lib (supported on 3.14+ of CMake with "-G Xcode" argument ONLY)
#    SIMULATOR_WATCHOS = Build for x86_64 for watchOS Simulator.
#
# CMAKE_OSX_SYSROOT: Path to the SDK to use.  By default this is
#    automatically determined from PLATFORM and xcodebuild, but
#    can also be manually specified (although this should not be required).
#
# CMAKE_DEVELOPER_ROOT: Path to the Developer directory for the platform
#    being compiled for.  By default this is automatically determined from
#    CMAKE_OSX_SYSROOT, but can also be manually specified (although this should
#    not be required).
#
# DEPLOYMENT_TARGET: Minimum SDK version to target. Default 2.0 on watchOS and 9.0 on tvOS+iOS
#
# ENABLE_BITCODE: (1|0) Enables or disables bitcode support. Default 1 (true)
#
# ENABLE_ARC: (1|0) Enables or disables ARC support. Default 1 (true, ARC enabled by default)
#
# ENABLE_VISIBILITY: (1|0) Enables or disables symbol visibility support. Default 0 (false, visibility hidden by default)
#
# ENABLE_STRICT_TRY_COMPILE: (1|0) Enables or disables strict try_compile() on all Check* directives (will run linker
#    to actually check if linking is possible). Default 0 (false, will set CMAKE_TRY_COMPILE_TARGET_TYPE to STATIC_LIBRARY)
#
# ARCHS: (armv7 armv7s armv7k arm64 arm64_32 i386 x86_64) If specified, will override the default architectures for the given PLATFORM
#    OS = armv7 armv7s arm64 (if applicable)
#    OS64 = arm64 (if applicable)
#    SIMULATOR = i386
#    SIMULATOR64 = x86_64
#    SIMULATORARM64 = arm64
#    TVOS = arm64
#    SIMULATOR_TVOS = x86_64 (i386 has since long been deprecated)
#    WATCHOS = armv7k arm64_32 (if applicable)
#    SIMULATOR_WATCHOS = x86_64 (i386 has since long been deprecated)
#
# This toolchain defines the following variables for use externally:
#
# XCODE_VERSION: Version number (not including Build version) of Xcode detected.
# SDK_VERSION: Version of SDK being used.
# CMAKE_OSX_ARCHITECTURES: Architectures being compiled for (generated from PLATFORM).
# APPLE_TARGET_TRIPLE: Used by autoconf build systems. NOTE: If "ARCHS" are overridden, this will *NOT* be set!
#
# This toolchain defines the following macros for use externally:
#
# set_xcode_property (TARGET XCODE_PROPERTY XCODE_VALUE XCODE_VARIANT)
#   A convenience macro for setting xcode specific properties on targets.
#   Available variants are: All, Release, RelWithDebInfo, Debug, MinSizeRel
#   example: set_xcode_property (myioslib IPHONEOS_DEPLOYMENT_TARGET "3.1" "all").
#
# find_host_package (PROGRAM ARGS)
#   A macro used to find executable programs on the host system, not within the
#   environment.  Thanks to the android-cmake project for providing the
#   command.
#
# ******************************** DEPRECATIONS *******************************
#
# IOS_DEPLOYMENT_TARGET: (Deprecated) Alias to DEPLOYMENT_TARGET
# CMAKE_IOS_DEVELOPER_ROOT: (Deprecated) Alias to CMAKE_DEVELOPER_ROOT
# IOS_PLATFORM: (Deprecated) Alias to PLATFORM
# IOS_ARCH: (Deprecated) Alias to ARCHS
#
# *****************************************************************************
#

# Fix for PThread library not in path
set(CMAKE_THREAD_LIBS_INIT "-lpthread")
set(CMAKE_HAVE_THREADS_LIBRARY 1)
set(CMAKE_USE_WIN32_THREADS_INIT 0)
set(CMAKE_USE_PTHREADS_INIT 1)

# Cache what generator is used
set(USED_CMAKE_GENERATOR "${CMAKE_GENERATOR}" CACHE STRING "Expose CMAKE_GENERATOR" FORCE)

if(${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.14")
  set(MODERN_CMAKE YES)
endif()

# Get the Xcode version being used.
execute_process(COMMAND xcodebuild -version
  OUTPUT_VARIABLE XCODE_VERSION
  ERROR_QUIET
  OUTPUT_STRIP_TRAILING_WHITESPACE)
string(REGEX MATCH "Xcode [0-9\\.]+" XCODE_VERSION "${XCODE_VERSION}")
string(REGEX REPLACE "Xcode ([0-9\\.]+)" "\\1" XCODE_VERSION "${XCODE_VERSION}")

# Assuming that xcode 12.0 is installed you most probably have ios sdk 14.2 or later installed (tested on Big Sur)
# if you don't set a deployment target it will be set the way you only get 64-bit builds
if(NOT DEFINED DEPLOYMENT_TARGET AND XCODE_VERSION VERSION_GREATER 12.0)
  option(DROP_32_BIT "Will make drop 32-bit support universally. On later sdks you won't be able to build 32-bit apps" yes)
  # Temporarily fix the arm64 issues in CMake install-combined by excluding arm64 for simulator builds (needed for Apple Silicon...)
  set(CMAKE_XCODE_ATTRIBUTE_EXCLUDED_ARCHS[sdk=iphonesimulator*] "arm64")
endif()

######## ALIASES (DEPRECATION WARNINGS)

if(DEFINED IOS_PLATFORM)
  set(PLATFORM ${IOS_PLATFORM})
  message(DEPRECATION "IOS_PLATFORM argument is DEPRECATED. Consider using the new PLATFORM argument instead.")
endif()

if(DEFINED IOS_DEPLOYMENT_TARGET)
  set(DEPLOYMENT_TARGET ${IOS_DEPLOYMENT_TARGET})
  message(DEPRECATION "IOS_DEPLOYMENT_TARGET argument is DEPRECATED. Consider using the new DEPLOYMENT_TARGET argument instead.")
endif()

if(DEFINED CMAKE_IOS_DEVELOPER_ROOT)
  set(CMAKE_DEVELOPER_ROOT ${CMAKE_IOS_DEVELOPER_ROOT})
  message(DEPRECATION "CMAKE_IOS_DEVELOPER_ROOT argument is DEPRECATED. Consider using the new CMAKE_DEVELOPER_ROOT argument instead.")
endif()

if(DEFINED IOS_ARCH)
  set(ARCHS ${IOS_ARCH})
  message(DEPRECATION "IOS_ARCH argument is DEPRECATED. Consider using the new ARCHS argument instead.")
endif()

######## END ALIASES

# Unset the FORCE on cache variables if in try_compile()
set(FORCE_CACHE FORCE)
get_property(_CMAKE_IN_TRY_COMPILE GLOBAL PROPERTY IN_TRY_COMPILE)
if(_CMAKE_IN_TRY_COMPILE)
  unset(FORCE_CACHE)
endif()

# Default to building for iPhoneOS if not specified otherwise, and we cannot
# determine the platform from the CMAKE_OSX_ARCHITECTURES variable. The use
# of CMAKE_OSX_ARCHITECTURES is such that try_compile() projects can correctly
# determine the value of PLATFORM from the root project, as
# CMAKE_OSX_ARCHITECTURES is propagated to them by CMake.
if(NOT DEFINED PLATFORM)
  if (CMAKE_OSX_ARCHITECTURES)
    if(CMAKE_OSX_ARCHITECTURES MATCHES "arm64" AND CMAKE_OSX_SYSROOT MATCHES ".*iphoneos.*")
      set(PLATFORM "OS64")
    elseif(CMAKE_OSX_ARCHITECTURES MATCHES ".*arm.*" AND CMAKE_OSX_SYSROOT MATCHES ".*iphoneos.*")
      set(PLATFORM "OS")
    elseif(CMAKE_OSX_ARCHITECTURES MATCHES "i386" AND CMAKE_OSX_SYSROOT MATCHES ".*iphonesimulator.*")
      set(PLATFORM "SIMULATOR")
    elseif(CMAKE_OSX_ARCHITECTURES MATCHES "x86_64" AND CMAKE_OSX_SYSROOT MATCHES ".*iphonesimulator.*")
      set(PLATFORM "SIMULATOR64")
    elseif(CMAKE_OSX_ARCHITECTURES MATCHES "arm64" AND CMAKE_OSX_SYSROOT MATCHES ".*iphonesimulator.*")
      set(PLATFORM "SIMULATORARM64")
    elseif(CMAKE_OSX_ARCHITECTURES MATCHES "arm64" AND CMAKE_OSX_SYSROOT MATCHES ".*appletvos.*")
      set(PLATFORM "TVOS")
    elseif(CMAKE_OSX_ARCHITECTURES MATCHES "x86_64" AND CMAKE_OSX_SYSROOT MATCHES ".*appletvsimulator.*")
      set(PLATFORM "SIMULATOR_TVOS")
    elseif(CMAKE_OSX_ARCHITECTURES MATCHES ".*armv7k.*" AND CMAKE_OSX_SYSROOT MATCHES ".*watchos.*")
      set(PLATFORM "WATCHOS")
    elseif(CMAKE_OSX_ARCHITECTURES MATCHES "i386" AND CMAKE_OSX_SYSROOT MATCHES ".*watchsimulator.*")
      set(PLATFORM "SIMULATOR_WATCHOS")
    endif()
  endif()
  if (NOT PLATFORM)
    if(DROP_32_BIT)
      set(PLATFORM "OS64")
    else()
      set(PLATFORM "OS")
    endif()
  endif()
endif()

set(PLATFORM_INT "${PLATFORM}" CACHE STRING "Type of platform for which the build targets.")

# Handle the case where we are targeting iOS and a version above 10.3.4 (32-bit support dropped officially)
if(PLATFORM_INT STREQUAL "OS" AND DEPLOYMENT_TARGET VERSION_GREATER_EQUAL 10.3.4)
  set(PLATFORM_INT "OS64")
  message(STATUS "Targeting minimum SDK version ${DEPLOYMENT_TARGET}. Dropping 32-bit support.")
elseif(PLATFORM_INT STREQUAL "SIMULATOR" AND DEPLOYMENT_TARGET VERSION_GREATER_EQUAL 10.3.4)
  set(PLATFORM_INT "SIMULATOR64")
  message(STATUS "Targeting minimum SDK version ${DEPLOYMENT_TARGET}. Dropping 32-bit support.")
endif()

# Determine the platform name and architectures for use in xcodebuild commands
# from the specified PLATFORM name.
if(PLATFORM_INT STREQUAL "OS")
  set(SDK_NAME iphoneos)
  if(NOT ARCHS)
    set(ARCHS armv7 armv7s arm64)
    set(APPLE_TARGET_TRIPLE_INT arm-apple-ios)
  endif()
elseif(PLATFORM_INT STREQUAL "OS64")
  set(SDK_NAME iphoneos)
  if(NOT ARCHS)
    if (XCODE_VERSION VERSION_GREATER 10.0)
      set(ARCHS arm64) # Add arm64e when Apple have fixed the integration issues with it, libarclite_iphoneos.a is currently missung bitcode markers for example
    else()
      set(ARCHS arm64)
    endif()
    set(APPLE_TARGET_TRIPLE_INT aarch64-apple-ios)
  endif()
elseif(PLATFORM_INT STREQUAL "OS64COMBINED")
  set(SDK_NAME iphoneos)
  if(MODERN_CMAKE)
    if(NOT ARCHS)
      if (XCODE_VERSION VERSION_GREATER 10.0)
        set(ARCHS arm64 x86_64) # Add arm64e when Apple have fixed the integration issues with it, libarclite_iphoneos.a is currently missung bitcode markers for example
      else()
        set(ARCHS arm64 x86_64)
      endif()
      set(APPLE_TARGET_TRIPLE_INT aarch64-x86_64-apple-ios)
    endif()
  else()
    message(FATAL_ERROR "Please make sure that you are running CMake 3.14+ to make the OS64COMBINED setting work")
  endif()
elseif(PLATFORM_INT STREQUAL "SIMULATOR")
  set(SDK_NAME iphonesimulator)
  if(NOT ARCHS)
    set(ARCHS i386)
    set(APPLE_TARGET_TRIPLE_INT i386-apple-ios)
  endif()
  message(DEPRECATION "SIMULATOR IS DEPRECATED. Consider using SIMULATOR64 instead.")
elseif(PLATFORM_INT STREQUAL "SIMULATOR64")
  set(SDK_NAME iphonesimulator)
  if(NOT ARCHS)
    set(ARCHS x86_64)
    set(APPLE_TARGET_TRIPLE_INT x86_64-apple-ios)
  endif()
elseif(PLATFORM_INT STREQUAL "SIMULATORARM64")
  set(SDK_NAME iphonesimulator)
  if(NOT ARCHS)
    set(ARCHS arm64)
    set(APPLE_TARGET_TRIPLE_INT aarch64-apple-ios)
  endif()
elseif(PLATFORM_INT STREQUAL "TVOS")
  set(SDK_NAME appletvos)
  if(NOT ARCHS)
    set(ARCHS arm64)
    set(APPLE_TARGET_TRIPLE_INT aarch64-apple-tvos)
  endif()
elseif (PLATFORM_INT STREQUAL "TVOSCOMBINED")
  set(SDK_NAME appletvos)
  if(MODERN_CMAKE)
    if(NOT ARCHS)
      set(ARCHS arm64 x86_64)
      set(APPLE_TARGET_TRIPLE_INT aarch64-x86_64-apple-tvos)
    endif()
  else()
    message(FATAL_ERROR "Please make sure that you are running CMake 3.14+ to make the TVOSCOMBINED setting work")
  endif()
elseif(PLATFORM_INT STREQUAL "SIMULATOR_TVOS")
  set(SDK_NAME appletvsimulator)
  if(NOT ARCHS)
    set(ARCHS x86_64)
    set(APPLE_TARGET_TRIPLE_INT x86_64-apple-tvos)
  endif()
elseif(PLATFORM_INT STREQUAL "WATCHOS")
  set(SDK_NAME watchos)
  if(NOT ARCHS)
    if (XCODE_VERSION VERSION_GREATER 10.0)
      set(ARCHS armv7k arm64_32)
      set(APPLE_TARGET_TRIPLE_INT aarch64_32-apple-watchos)
    else()
      set(ARCHS armv7k)
      set(APPLE_TARGET_TRIPLE_INT arm-apple-watchos)
    endif()
  endif()
elseif(PLATFORM_INT STREQUAL "WATCHOSCOMBINED")
  set(SDK_NAME watchos)
  if(MODERN_CMAKE)
    if(NOT ARCHS)
      if (XCODE_VERSION VERSION_GREATER 10.0)
        set(ARCHS armv7k arm64_32 i386)
        set(APPLE_TARGET_TRIPLE_INT aarch64_32-i386-apple-watchos)
      else()
        set(ARCHS armv7k i386)
        set(APPLE_TARGET_TRIPLE_INT arm-i386-apple-watchos)
      endif()
    endif()
  else()
    message(FATAL_ERROR "Please make sure that you are running CMake 3.14+ to make the WATCHOSCOMBINED setting work")
  endif()
elseif(PLATFORM_INT STREQUAL "SIMULATOR_WATCHOS")
  set(SDK_NAME watchsimulator)
  if(NOT ARCHS)
    set(ARCHS i386)
    set(APPLE_TARGET_TRIPLE_INT i386-apple-watchos)
  endif()
else()
  message(FATAL_ERROR "Invalid PLATFORM: ${PLATFORM_INT}")
endif()

if(MODERN_CMAKE AND PLATFORM_INT MATCHES ".*COMBINED" AND NOT USED_CMAKE_GENERATOR MATCHES "Xcode")
  message(FATAL_ERROR "The COMBINED options only work with Xcode generator, -G Xcode")
endif()

# If user did not specify the SDK root to use, then query xcodebuild for it.
execute_process(COMMAND xcodebuild -version -sdk ${SDK_NAME} Path
    OUTPUT_VARIABLE CMAKE_OSX_SYSROOT_INT
    ERROR_QUIET
    OUTPUT_STRIP_TRAILING_WHITESPACE)
if (NOT DEFINED CMAKE_OSX_SYSROOT_INT AND NOT DEFINED CMAKE_OSX_SYSROOT)
  message(SEND_ERROR "Please make sure that Xcode is installed and that the toolchain"
  "is pointing to the correct path. Please run:"
  "sudo xcode-select -s /Applications/Xcode.app/Contents/Developer"
  "and see if that fixes the problem for you.")
  message(FATAL_ERROR "Invalid CMAKE_OSX_SYSROOT: ${CMAKE_OSX_SYSROOT} "
  "does not exist.")
elseif(DEFINED CMAKE_OSX_SYSROOT_INT)
   set(CMAKE_OSX_SYSROOT "${CMAKE_OSX_SYSROOT_INT}" CACHE INTERNAL "")
endif()

# Set Xcode property for SDKROOT as well if Xcode generator is used
if(USED_CMAKE_GENERATOR MATCHES "Xcode")
  set(CMAKE_OSX_SYSROOT "${SDK_NAME}" CACHE INTERNAL "")
  if(NOT DEFINED CMAKE_XCODE_ATTRIBUTE_DEVELOPMENT_TEAM)
    set(CMAKE_XCODE_ATTRIBUTE_DEVELOPMENT_TEAM "123456789A")
  endif()
endif()

# Specify minimum version of deployment target.
if(NOT DEFINED DEPLOYMENT_TARGET)
  if (PLATFORM_INT STREQUAL "WATCHOS" OR PLATFORM_INT STREQUAL "SIMULATOR_WATCHOS")
    # Unless specified, SDK version 2.0 is used by default as minimum target version (watchOS).
    set(DEPLOYMENT_TARGET "2.0"
            CACHE STRING "Minimum SDK version to build for." )
  else()
    # Unless specified, SDK version 9.0 is used by default as minimum target version (iOS, tvOS).
    set(DEPLOYMENT_TARGET "9.0"
            CACHE STRING "Minimum SDK version to build for." )
  endif()
  message(STATUS "Using the default min-version since DEPLOYMENT_TARGET not provided!")
endif()

# Use bitcode or not
if(NOT DEFINED ENABLE_BITCODE AND NOT ARCHS MATCHES "((^|;|, )(i386|x86_64))+")
  # Unless specified, enable bitcode support by default
  message(STATUS "Enabling bitcode support by default. ENABLE_BITCODE not provided!")
  set(ENABLE_BITCODE TRUE)
elseif(NOT DEFINED ENABLE_BITCODE)
  message(STATUS "Disabling bitcode support by default on simulators. ENABLE_BITCODE not provided for override!")
  set(ENABLE_BITCODE FALSE)
endif()
set(ENABLE_BITCODE_INT ${ENABLE_BITCODE} CACHE BOOL "Whether or not to enable bitcode" ${FORCE_CACHE})
# Use ARC or not
if(NOT DEFINED ENABLE_ARC)
  # Unless specified, enable ARC support by default
  set(ENABLE_ARC TRUE)
  message(STATUS "Enabling ARC support by default. ENABLE_ARC not provided!")
endif()
set(ENABLE_ARC_INT ${ENABLE_ARC} CACHE BOOL "Whether or not to enable ARC" ${FORCE_CACHE})
# Use hidden visibility or not
if(NOT DEFINED ENABLE_VISIBILITY)
  # Unless specified, disable symbols visibility by default
  set(ENABLE_VISIBILITY FALSE)
  message(STATUS "Hiding symbols visibility by default. ENABLE_VISIBILITY not provided!")
endif()
set(ENABLE_VISIBILITY_INT ${ENABLE_VISIBILITY} CACHE BOOL "Whether or not to hide symbols (-fvisibility=hidden)" ${FORCE_CACHE})
# Set strict compiler checks or not
if(NOT DEFINED ENABLE_STRICT_TRY_COMPILE)
  # Unless specified, disable strict try_compile()
  set(ENABLE_STRICT_TRY_COMPILE FALSE)
  message(STATUS "Using NON-strict compiler checks by default. ENABLE_STRICT_TRY_COMPILE not provided!")
endif()
set(ENABLE_STRICT_TRY_COMPILE_INT ${ENABLE_STRICT_TRY_COMPILE} CACHE BOOL "Whether or not to use strict compiler checks" ${FORCE_CACHE})
# Get the SDK version information.
execute_process(COMMAND xcodebuild -sdk ${CMAKE_OSX_SYSROOT} -version SDKVersion
  OUTPUT_VARIABLE SDK_VERSION
  ERROR_QUIET
  OUTPUT_STRIP_TRAILING_WHITESPACE)

# Find the Developer root for the specific iOS platform being compiled for
# from CMAKE_OSX_SYSROOT.  Should be ../../ from SDK specified in
# CMAKE_OSX_SYSROOT. There does not appear to be a direct way to obtain
# this information from xcrun or xcodebuild.
if (NOT DEFINED CMAKE_DEVELOPER_ROOT AND NOT USED_CMAKE_GENERATOR MATCHES "Xcode")
  get_filename_component(PLATFORM_SDK_DIR ${CMAKE_OSX_SYSROOT} PATH)
  get_filename_component(CMAKE_DEVELOPER_ROOT ${PLATFORM_SDK_DIR} PATH)
  if (NOT DEFINED CMAKE_DEVELOPER_ROOT)
    message(FATAL_ERROR "Invalid CMAKE_DEVELOPER_ROOT: "
      "${CMAKE_DEVELOPER_ROOT} does not exist.")
  endif()
endif()
# Find the C & C++ compilers for the specified SDK.
if(NOT CMAKE_C_COMPILER)
  execute_process(COMMAND xcrun -sdk ${CMAKE_OSX_SYSROOT} -find clang
    OUTPUT_VARIABLE CMAKE_C_COMPILER
    ERROR_QUIET
    OUTPUT_STRIP_TRAILING_WHITESPACE)
  message(STATUS "Using C compiler: ${CMAKE_C_COMPILER}")
endif()
if(NOT CMAKE_CXX_COMPILER)
  execute_process(COMMAND xcrun -sdk ${CMAKE_OSX_SYSROOT} -find clang++
    OUTPUT_VARIABLE CMAKE_CXX_COMPILER
    ERROR_QUIET
    OUTPUT_STRIP_TRAILING_WHITESPACE)
  message(STATUS "Using CXX compiler: ${CMAKE_CXX_COMPILER}")
endif()
# Find (Apple's) libtool.
execute_process(COMMAND xcrun -sdk ${CMAKE_OSX_SYSROOT} -find libtool
  OUTPUT_VARIABLE BUILD_LIBTOOL
  ERROR_QUIET
  OUTPUT_STRIP_TRAILING_WHITESPACE)
message(STATUS "Using libtool: ${BUILD_LIBTOOL}")
# Configure libtool to be used instead of ar + ranlib to build static libraries.
# This is required on Xcode 7+, but should also work on previous versions of
# Xcode.
set(CMAKE_C_CREATE_STATIC_LIBRARY
  "${BUILD_LIBTOOL} -static -o <TARGET> <LINK_FLAGS> <OBJECTS> ")
set(CMAKE_CXX_CREATE_STATIC_LIBRARY
  "${BUILD_LIBTOOL} -static -o <TARGET> <LINK_FLAGS> <OBJECTS> ")
# Find the toolchain's provided install_name_tool if none is found on the host
if(NOT CMAKE_INSTALL_NAME_TOOL)
  execute_process(COMMAND xcrun -sdk ${CMAKE_OSX_SYSROOT} -find install_name_tool
      OUTPUT_VARIABLE CMAKE_INSTALL_NAME_TOOL_INT
      ERROR_QUIET
      OUTPUT_STRIP_TRAILING_WHITESPACE)
  set(CMAKE_INSTALL_NAME_TOOL ${CMAKE_INSTALL_NAME_TOOL_INT} CACHE STRING "" ${FORCE_CACHE})
endif()
# Get the version of Darwin (OS X) of the host.
execute_process(COMMAND uname -r
  OUTPUT_VARIABLE CMAKE_HOST_SYSTEM_VERSION
  ERROR_QUIET
  OUTPUT_STRIP_TRAILING_WHITESPACE)
if(SDK_NAME MATCHES "iphone")
  set(CMAKE_SYSTEM_NAME iOS CACHE INTERNAL "" ${FORCE_CACHE})
endif()
# CMake 3.14+ support building for iOS, watchOS and tvOS out of the box.
if(MODERN_CMAKE)
  if(SDK_NAME MATCHES "appletv")
    set(CMAKE_SYSTEM_NAME tvOS CACHE INTERNAL "" ${FORCE_CACHE})
  elseif(SDK_NAME MATCHES "watch")
    set(CMAKE_SYSTEM_NAME watchOS CACHE INTERNAL "" ${FORCE_CACHE})
  endif()
  # Provide flags for a combined FAT library build on newer CMake versions
  if(PLATFORM_INT MATCHES ".*COMBINED")
    set(CMAKE_XCODE_ATTRIBUTE_ONLY_ACTIVE_ARCH "NO")
    set(CMAKE_IOS_INSTALL_COMBINED YES CACHE INTERNAL "" ${FORCE_CACHE})
    message(STATUS "Will combine built (static) artifacts into FAT lib...")
  endif()
elseif(${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.10")
  # Legacy code path prior to CMake 3.14 or fallback if no SDK_NAME specified
  set(CMAKE_SYSTEM_NAME iOS CACHE INTERNAL "" ${FORCE_CACHE})
else()
  # Legacy code path prior to CMake 3.14 or fallback if no SDK_NAME specified
  set(CMAKE_SYSTEM_NAME Darwin CACHE INTERNAL "" ${FORCE_CACHE})
endif()
# Standard settings.
set(CMAKE_SYSTEM_VERSION ${SDK_VERSION} CACHE INTERNAL "")
set(UNIX TRUE CACHE BOOL "")
set(APPLE TRUE CACHE BOOL "")
set(IOS TRUE CACHE BOOL "")
set(CMAKE_AR ar CACHE FILEPATH "" FORCE)
set(CMAKE_RANLIB ranlib CACHE FILEPATH "" FORCE)
set(CMAKE_STRIP strip CACHE FILEPATH "" FORCE)
# Set the architectures for which to build.
set(CMAKE_OSX_ARCHITECTURES ${ARCHS} CACHE STRING "Build architecture for iOS")
# Change the type of target generated for try_compile() so it'll work when cross-compiling, weak compiler checks
if(ENABLE_STRICT_TRY_COMPILE_INT)
  message(STATUS "Using strict compiler checks (default in CMake).")
else()
  set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
endif()
# All iOS/Darwin specific settings - some may be redundant.
set(CMAKE_MACOSX_BUNDLE YES)
set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED "NO")
set(CMAKE_SHARED_LIBRARY_PREFIX "lib")
set(CMAKE_SHARED_LIBRARY_SUFFIX ".dylib")
set(CMAKE_SHARED_MODULE_PREFIX "lib")
set(CMAKE_SHARED_MODULE_SUFFIX ".so")
set(CMAKE_C_COMPILER_ABI ELF)
set(CMAKE_CXX_COMPILER_ABI ELF)
set(CMAKE_C_HAS_ISYSROOT 1)
set(CMAKE_CXX_HAS_ISYSROOT 1)
set(CMAKE_MODULE_EXISTS 1)
set(CMAKE_DL_LIBS "")
set(CMAKE_C_OSX_COMPATIBILITY_VERSION_FLAG "-compatibility_version ")
set(CMAKE_C_OSX_CURRENT_VERSION_FLAG "-current_version ")
set(CMAKE_CXX_OSX_COMPATIBILITY_VERSION_FLAG "${CMAKE_C_OSX_COMPATIBILITY_VERSION_FLAG}")
set(CMAKE_CXX_OSX_CURRENT_VERSION_FLAG "${CMAKE_C_OSX_CURRENT_VERSION_FLAG}")

if(ARCHS MATCHES "((^|;|, )(arm64|arm64e|x86_64))+")
  set(CMAKE_C_SIZEOF_DATA_PTR 8)
  set(CMAKE_CXX_SIZEOF_DATA_PTR 8)
  if(ARCHS MATCHES "((^|;|, )(arm64|arm64e))+")
    set(CMAKE_SYSTEM_PROCESSOR "aarch64")
  else()
    set(CMAKE_SYSTEM_PROCESSOR "x86_64")
  endif()
else()
  set(CMAKE_C_SIZEOF_DATA_PTR 4)
  set(CMAKE_CXX_SIZEOF_DATA_PTR 4)
  set(CMAKE_SYSTEM_PROCESSOR "arm")
endif()

# Note that only Xcode 7+ supports the newer more specific:
# -m${SDK_NAME}-version-min flags, older versions of Xcode use:
# -m(ios/ios-simulator)-version-min instead.
if(${CMAKE_VERSION} VERSION_LESS "3.11")
  if(PLATFORM_INT STREQUAL "OS" OR PLATFORM_INT STREQUAL "OS64")
    if(XCODE_VERSION VERSION_LESS 7.0)
      set(SDK_NAME_VERSION_FLAGS
        "-mios-version-min=${DEPLOYMENT_TARGET}")
    else()
      # Xcode 7.0+ uses flags we can build directly from SDK_NAME.
      set(SDK_NAME_VERSION_FLAGS
        "-m${SDK_NAME}-version-min=${DEPLOYMENT_TARGET}")
    endif()
  elseif(PLATFORM_INT STREQUAL "TVOS")
    set(SDK_NAME_VERSION_FLAGS
      "-mtvos-version-min=${DEPLOYMENT_TARGET}")
  elseif(PLATFORM_INT STREQUAL "SIMULATOR_TVOS")
    set(SDK_NAME_VERSION_FLAGS
      "-mtvos-simulator-version-min=${DEPLOYMENT_TARGET}")
  elseif(PLATFORM_INT STREQUAL "WATCHOS")
    set(SDK_NAME_VERSION_FLAGS
      "-mwatchos-version-min=${DEPLOYMENT_TARGET}")
  elseif(PLATFORM_INT STREQUAL "SIMULATOR_WATCHOS")
    set(SDK_NAME_VERSION_FLAGS
      "-mwatchos-simulator-version-min=${DEPLOYMENT_TARGET}")
  else()
    # SIMULATOR or SIMULATOR64 both use -mios-simulator-version-min.
    set(SDK_NAME_VERSION_FLAGS
      "-mios-simulator-version-min=${DEPLOYMENT_TARGET}")
  endif()
else()
  # Newer versions of CMake sets the version min flags correctly
  set(CMAKE_OSX_DEPLOYMENT_TARGET ${DEPLOYMENT_TARGET} CACHE STRING
      "Set CMake deployment target" ${FORCE_CACHE})
endif()

if(DEFINED APPLE_TARGET_TRIPLE_INT)
  set(APPLE_TARGET_TRIPLE ${APPLE_TARGET_TRIPLE_INT} CACHE STRING
          "Autoconf target triple compatible variable" ${FORCE_CACHE})
endif()

if(ENABLE_BITCODE_INT)
  set(BITCODE "-fembed-bitcode")
  set(CMAKE_XCODE_ATTRIBUTE_BITCODE_GENERATION_MODE "bitcode")
  set(CMAKE_XCODE_ATTRIBUTE_ENABLE_BITCODE "YES")
else()
  set(BITCODE "")
  set(CMAKE_XCODE_ATTRIBUTE_ENABLE_BITCODE "NO")
endif()

if(ENABLE_ARC_INT)
  set(FOBJC_ARC "-fobjc-arc")
  set(CMAKE_XCODE_ATTRIBUTE_CLANG_ENABLE_OBJC_ARC "YES")
else()
  set(FOBJC_ARC "-fno-objc-arc")
  set(CMAKE_XCODE_ATTRIBUTE_CLANG_ENABLE_OBJC_ARC "NO")
endif()

if(NOT ENABLE_VISIBILITY_INT)
  set(VISIBILITY "-fvisibility=hidden")
  set(CMAKE_XCODE_ATTRIBUTE_GCC_SYMBOLS_PRIVATE_EXTERN "YES")
else()
  set(VISIBILITY "")
  set(CMAKE_XCODE_ATTRIBUTE_GCC_SYMBOLS_PRIVATE_EXTERN "NO")
endif()

if(NOT IOS_TOOLCHAIN_HAS_RUN)
  #Check if Xcode generator is used, since that will handle these flags automagically
  if(USED_CMAKE_GENERATOR MATCHES "Xcode")
    message(STATUS "Not setting any manual command-line buildflags, since Xcode is selected as generator.")
  else()
    set(CMAKE_C_FLAGS
    "${SDK_NAME_VERSION_FLAGS} ${BITCODE} -fobjc-abi-version=2 ${FOBJC_ARC} ${CMAKE_C_FLAGS}")
    # Hidden visibilty is required for C++ on iOS.
    set(CMAKE_CXX_FLAGS
    "${SDK_NAME_VERSION_FLAGS} ${BITCODE} ${VISIBILITY} -fvisibility-inlines-hidden -fobjc-abi-version=2 ${FOBJC_ARC} ${CMAKE_CXX_FLAGS}")
    set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS} -O0 -g ${CMAKE_CXX_FLAGS_DEBUG}")
    set(CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS} -DNDEBUG -Os -ffast-math ${CMAKE_CXX_FLAGS_MINSIZEREL}")
    set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS} -DNDEBUG -O2 -g -ffast-math ${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} -DNDEBUG -O3 -ffast-math ${CMAKE_CXX_FLAGS_RELEASE}")
    set(CMAKE_C_LINK_FLAGS "${SDK_NAME_VERSION_FLAGS} -Wl,-search_paths_first ${CMAKE_C_LINK_FLAGS}")
    set(CMAKE_CXX_LINK_FLAGS "${SDK_NAME_VERSION_FLAGS}  -Wl,-search_paths_first ${CMAKE_CXX_LINK_FLAGS}")
    set(CMAKE_ASM_FLAGS "${CFLAGS} -x assembler-with-cpp -arch ${CMAKE_OSX_ARCHITECTURES}")

    # In order to ensure that the updated compiler flags are used in try_compile()
    # tests, we have to forcibly set them in the CMake cache, not merely set them
    # in the local scope.
    set(VARS_TO_FORCE_IN_CACHE
      CMAKE_C_FLAGS
      CMAKE_CXX_FLAGS
      CMAKE_CXX_FLAGS_DEBUG
      CMAKE_CXX_FLAGS_RELWITHDEBINFO
      CMAKE_CXX_FLAGS_MINSIZEREL
      CMAKE_CXX_FLAGS_RELEASE
      CMAKE_C_LINK_FLAGS
      CMAKE_CXX_LINK_FLAGS)
    foreach(VAR_TO_FORCE ${VARS_TO_FORCE_IN_CACHE})
      set(${VAR_TO_FORCE} "${${VAR_TO_FORCE}}" CACHE STRING "" ${FORCE_CACHE})
    endforeach()
  endif()

  ## Print status messages to inform of the current state
  message(STATUS "Configuring ${SDK_NAME} build for platform: ${PLATFORM_INT}, architecture(s): ${ARCHS}")
  message(STATUS "Using SDK: ${CMAKE_OSX_SYSROOT_INT}")
  if(DEFINED APPLE_TARGET_TRIPLE)
    message(STATUS "Autoconf target triple: ${APPLE_TARGET_TRIPLE}")
  endif()
  message(STATUS "Using minimum deployment version: ${DEPLOYMENT_TARGET}"
      " (SDK version: ${SDK_VERSION})")
  if(MODERN_CMAKE)
    message(STATUS "Merging integrated CMake 3.14+ iOS,tvOS,watchOS,macOS toolchain(s) with this toolchain!")
  endif()
  if(USED_CMAKE_GENERATOR MATCHES "Xcode")
    message(STATUS "Using Xcode version: ${XCODE_VERSION}")
  endif()
  if(DEFINED SDK_NAME_VERSION_FLAGS)
    message(STATUS "Using version flags: ${SDK_NAME_VERSION_FLAGS}")
  endif()
  message(STATUS "Using a data_ptr size of: ${CMAKE_CXX_SIZEOF_DATA_PTR}")
  message(STATUS "Using install_name_tool: ${CMAKE_INSTALL_NAME_TOOL}")
  if(ENABLE_BITCODE_INT)
    message(STATUS "Enabling bitcode support.")
  else()
    message(STATUS "Disabling bitcode support.")
  endif()

  if(ENABLE_ARC_INT)
    message(STATUS "Enabling ARC support.")
  else()
    message(STATUS "Disabling ARC support.")
  endif()

  if(NOT ENABLE_VISIBILITY_INT)
    message(STATUS "Hiding symbols (-fvisibility=hidden).")
  endif()
endif()

set(CMAKE_PLATFORM_HAS_INSTALLNAME 1)
set(CMAKE_SHARED_LINKER_FLAGS "-rpath @executable_path/Frameworks -rpath @loader_path/Frameworks")
set(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-dynamiclib -Wl,-headerpad_max_install_names")
set(CMAKE_SHARED_MODULE_CREATE_C_FLAGS "-bundle -Wl,-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 ".tbd" ".dylib" ".so" ".a")
set(CMAKE_SHARED_LIBRARY_SONAME_C_FLAG "-install_name")

# Set the find root to the iOS developer roots and to user defined paths.
set(CMAKE_FIND_ROOT_PATH ${CMAKE_OSX_SYSROOT_INT} ${CMAKE_PREFIX_PATH} CACHE STRING "Root path that will be prepended
 to all search paths")
# Default to searching for frameworks first.
set(CMAKE_FIND_FRAMEWORK FIRST)
# Set up the default search directories for frameworks.
set(CMAKE_FRAMEWORK_PATH
  ${CMAKE_DEVELOPER_ROOT}/Library/PrivateFrameworks
  ${CMAKE_OSX_SYSROOT_INT}/System/Library/Frameworks
  ${CMAKE_FRAMEWORK_PATH} CACHE STRING "Frameworks search paths" ${FORCE_CACHE})

set(IOS_TOOLCHAIN_HAS_RUN TRUE CACHE BOOL "Has the CMake toolchain run already?" ${FORCE_CACHE})

# By default, search both the specified iOS SDK and the remainder of the host filesystem.
if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
  set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM BOTH CACHE STRING "" ${FORCE_CACHE})
endif()
if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
  set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY BOTH CACHE STRING "" ${FORCE_CACHE})
endif()
if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
  set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE BOTH CACHE STRING "" ${FORCE_CACHE})
endif()
if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
  set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE BOTH CACHE STRING "" ${FORCE_CACHE})
endif()

#
# Some helper-macros below to simplify and beautify the CMakeFile
#

# This little macro lets you set any Xcode specific property.
macro(set_xcode_property TARGET XCODE_PROPERTY XCODE_VALUE XCODE_RELVERSION)
  set(XCODE_RELVERSION_I "${XCODE_RELVERSION}")
  if(XCODE_RELVERSION_I STREQUAL "All")
    set_property(TARGET ${TARGET} PROPERTY
    XCODE_ATTRIBUTE_${XCODE_PROPERTY} "${XCODE_VALUE}")
  else()
    set_property(TARGET ${TARGET} PROPERTY
    XCODE_ATTRIBUTE_${XCODE_PROPERTY}[variant=${XCODE_RELVERSION_I}] "${XCODE_VALUE}")
  endif()
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(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE NEVER)
  set(IOS FALSE)
  find_package(${ARGN})
  set(IOS TRUE)
  set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM BOTH)
  set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY BOTH)
  set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE BOTH)
  set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE BOTH)
endmacro(find_host_package)