# 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)

# support iOS on cmake 3.11+
# cmake 3.11 milestone feature, https://gitlab.kitware.com/cmake/cmake/issues/17431 
set(CMAKE_OSX_DEPLOYMENT_TARGET "8.0" CACHE STRING "set 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 Clang for iOS
include(CMakeForceCompiler)
set(CMAKE_C_COMPILER /usr/bin/clang Clang)
set(CMAKE_CXX_COMPILER /usr/bin/clang++ Clang)
set(CMAKE_AR ar CACHE FILEPATH "" FORCE)

# Skip the platform compiler checks for cross compiling
set(CMAKE_CXX_COMPILER_WORKS TRUE)
set(CMAKE_C_COMPILER_WORKS TRUE)

# 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}")

set(CMAKE_C_FLAGS_INIT "")
set(CMAKE_CXX_FLAGS_INIT "")

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

# Setup building for arm64 or not
if(NOT DEFINED BUILD_ARM64)
    set(BUILD_ARM64 true)
endif(NOT DEFINED BUILD_ARM64)
set(BUILD_ARM64 ${BUILD_ARM64} CACHE STRING "Build arm64 arch or not")

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

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

    # This causes the installers to properly locate the output libraries
    set(CMAKE_XCODE_EFFECTIVE_PLATFORMS "-iphonesimulator")
elseif(IOS_PLATFORM STREQUAL "SIMULATOR64")
    set(SIMULATOR true)
    set(IOS_PLATFORM_LOCATION "iPhoneSimulator.platform")

    # This causes the installers to properly locate the output libraries
    set(CMAKE_XCODE_EFFECTIVE_PLATFORMS "-iphonesimulator")
else()
    message(FATAL_ERROR "Unsupported IOS_PLATFORM value selected. Please choose OS or SIMULATOR")
endif()

# 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
set(XCODE_POST_43_ROOT "/Applications/Xcode.app/Contents/Developer/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 (IOS_ARCH armv7 armv7s arm64)
    set(IOS_ARCH arm64 armv7)
elseif(IOS_PLATFORM STREQUAL "SIMULATOR")
    set(IOS_ARCH i386)
elseif(IOS_PLATFORM STREQUAL "SIMULATOR64")
    set(IOS_ARCH x86_64)
endif()

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 macro lets you find library on the host system
macro(find_host_library)
    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY NEVER)

    find_library(${ARGN})

    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
endmacro(find_host_library)
