# 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 = iPhoneOS (default) or iPhoneSimulator
#   This decides if SDKS will be selected from the iPhoneOS.platform or iPhoneSimulator.platform folders
#   iPhoneOS - the default, used to build for iPhone and iPad physical devices, which have an arm arch.
#   iPhoneSimulator - 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)

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

# Add Bitcode
if(${IOS_PLATFORM} STREQUAL "iPhoneOS")
  set(CMAKE_XCODE_ATTRIBUTE_BITCODE_GENERATION_MODE "bitcode")
  set(CMAKE_C_FLAGS "-fembed-bitcode ${CMAKE_C_FLAGS}")
  set(CMAKE_CXX_FLAGS "-fembed-bitcode ${CMAKE_CXX_FLAGS}")
endif(${IOS_PLATFORM} STREQUAL "iPhoneOS")

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

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

# Set the architecture for iOS
# NOTE: Currently both ARCHS_STANDARD_32_BIT and ARCHS_UNIVERSAL_IPHONE_OS set armv7 only, so set both manually
if(${IOS_PLATFORM} STREQUAL "iPhoneOS")
  set(IOS_ARCH armv7)
else()
  set(IOS_ARCH x86_64)
endif()

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

# 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)

# 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}")

# Hidden visibilty is required for cxx on iOS
set(CMAKE_C_FLAGS_INIT "-arch ${IOS_ARCH} -isysroot ${CMAKE_OSX_SYSROOT} -miphoneos-version-min=6.0")
set(CMAKE_CXX_FLAGS_INIT "-arch ${IOS_ARCH} -stdlib=libc++ -fvisibility=hidden -fvisibility-inlines-hidden -isysroot ${CMAKE_OSX_SYSROOT} -miphoneos-version-min=6.0")

set(CMAKE_C_LINK_FLAGS "-arch ${IOS_ARCH} -Wl,-search_paths_first ${CMAKE_C_LINK_FLAGS}")
set(CMAKE_CXX_LINK_FLAGS "-arch ${IOS_ARCH} -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 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")
if(NOT DEFINED CMAKE_IOS_DEVELOPER_ROOT)
  if(EXISTS ${XCODE_POST_43_ROOT})
    set(CMAKE_IOS_DEVELOPER_ROOT ${XCODE_POST_43_ROOT})
  endif()
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(CMAKE_C_COMPILER "/Applications/Xcode.app/Contents/Developer/usr/bin/gcc")
set(CMAKE_CXX_COMPILER "/Applications/Xcode.app/Contents/Developer/usr/bin/g++")
set(CMAKE_AR ar CACHE FILEPATH "" FORCE)

# 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)
