csukuangfj

first commit

477da44 5 months ago

86.5 kB

	# Copyright (c) 2010-2011, Ethan Rublee
	# Copyright (c) 2011-2014, Andrey Kamaev
	# 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.

	# ------------------------------------------------------------------------------
	# Android CMake toolchain file, for use with the Android NDK r5-r10d
	# Requires cmake 2.6.3 or newer (2.8.9 or newer is recommended).
	# See home page: https://github.com/taka-no-me/android-cmake
	#
	# Usage Linux:
	# $ export ANDROID_NDK=/absolute/path/to/the/android-ndk
	# $ mkdir build && cd build
	# $ cmake -DCMAKE_TOOLCHAIN_FILE=path/to/the/android.toolchain.cmake ..
	# $ make -j8
	#
	# Usage Windows:
	# You need native port of make to build your project.
	# Android NDK r7 (and newer) already has make.exe on board.
	# For older NDK you have to install it separately.
	# For example, this one: http://gnuwin32.sourceforge.net/packages/make.htm
	#
	# $ SET ANDROID_NDK=C:\absolute\path\to\the\android-ndk
	# $ mkdir build && cd build
	# $ cmake.exe -G"MinGW Makefiles"
	# -DCMAKE_TOOLCHAIN_FILE=path\to\the\android.toolchain.cmake
	# -DCMAKE_MAKE_PROGRAM="%ANDROID_NDK%\prebuilt\windows\bin\make.exe" ..
	# $ cmake.exe --build .
	#
	#
	# Options (can be set as cmake parameters: -D<option_name>=<value>):
	# ANDROID_NDK=/opt/android-ndk - path to the NDK root.
	# Can be set as environment variable. Can be set only at first cmake run.
	#
	# ANDROID_ABI=armeabi-v7a - specifies the target Application Binary
	# Interface (ABI). This option nearly matches to the APP_ABI variable
	# used by ndk-build tool from Android NDK.
	#
	# Possible targets are:
	# "armeabi" - ARMv5TE based CPU with software floating point operations
	# "armeabi-v7a" - ARMv7 based devices with hardware FPU instructions
	# this ABI target is used by default
	# "armeabi-v7a-hard with NEON" - ARMv7 based devices with hardware FPU instructions and hardfp
	# "armeabi-v7a with NEON" - same as armeabi-v7a, but
	# sets NEON as floating-point unit
	# "armeabi-v7a with VFPV3" - same as armeabi-v7a, but
	# sets VFPV3 as floating-point unit (has 32 registers instead of 16)
	# "armeabi-v6 with VFP" - tuned for ARMv6 processors having VFP
	# "x86" - IA-32 instruction set
	# "mips" - MIPS32 instruction set
	#
	# 64-bit ABIs for NDK r10 and newer:
	# "arm64-v8a" - ARMv8 AArch64 instruction set
	# "x86_64" - Intel64 instruction set (r1)
	# "mips64" - MIPS64 instruction set (r6)
	#
	# ANDROID_NATIVE_API_LEVEL=android-8 - level of Android API compile for.
	# Option is read-only when standalone toolchain is used.
	# Note: building for "android-L" requires explicit configuration.
	#
	# ANDROID_TOOLCHAIN_NAME=arm-linux-androideabi-4.9 - the name of compiler
	# toolchain to be used. The list of possible values depends on the NDK
	# version. For NDK r10c the possible values are:
	#
	# * aarch64-linux-android-4.9
	# * aarch64-linux-android-clang3.4
	# * aarch64-linux-android-clang3.5
	# * arm-linux-androideabi-4.6
	# * arm-linux-androideabi-4.8
	# * arm-linux-androideabi-4.9 (default)
	# * arm-linux-androideabi-clang3.4
	# * arm-linux-androideabi-clang3.5
	# * mips64el-linux-android-4.9
	# * mips64el-linux-android-clang3.4
	# * mips64el-linux-android-clang3.5
	# * mipsel-linux-android-4.6
	# * mipsel-linux-android-4.8
	# * mipsel-linux-android-4.9
	# * mipsel-linux-android-clang3.4
	# * mipsel-linux-android-clang3.5
	# * x86-4.6
	# * x86-4.8
	# * x86-4.9
	# * x86-clang3.4
	# * x86-clang3.5
	# * x86_64-4.9
	# * x86_64-clang3.4
	# * x86_64-clang3.5
	#
	# ANDROID_FORCE_ARM_BUILD=OFF - set ON to generate 32-bit ARM instructions
	# instead of Thumb. Is not available for "armeabi-v6 with VFP"
	# (is forced to be ON) ABI.
	#
	# ANDROID_NO_UNDEFINED=ON - set ON to show all undefined symbols as linker
	# errors even if they are not used.
	#
	# ANDROID_SO_UNDEFINED=OFF - set ON to allow undefined symbols in shared
	# libraries. Automatically turned for NDK r5x and r6x due to GLESv2
	# problems.
	#
	# ANDROID_STL=gnustl_static - specify the runtime to use.
	#
	# Possible values are:
	# none -> Do not configure the runtime.
	# system -> Use the default minimal system C++ runtime library.
	# Implies -fno-rtti -fno-exceptions.
	# Is not available for standalone toolchain.
	# system_re -> Use the default minimal system C++ runtime library.
	# Implies -frtti -fexceptions.
	# Is not available for standalone toolchain.
	# gabi++_static -> Use the GAbi++ runtime as a static library.
	# Implies -frtti -fno-exceptions.
	# Available for NDK r7 and newer.
	# Is not available for standalone toolchain.
	# gabi++_shared -> Use the GAbi++ runtime as a shared library.
	# Implies -frtti -fno-exceptions.
	# Available for NDK r7 and newer.
	# Is not available for standalone toolchain.
	# stlport_static -> Use the STLport runtime as a static library.
	# Implies -fno-rtti -fno-exceptions for NDK before r7.
	# Implies -frtti -fno-exceptions for NDK r7 and newer.
	# Is not available for standalone toolchain.
	# stlport_shared -> Use the STLport runtime as a shared library.
	# Implies -fno-rtti -fno-exceptions for NDK before r7.
	# Implies -frtti -fno-exceptions for NDK r7 and newer.
	# Is not available for standalone toolchain.
	# gnustl_static -> Use the GNU STL as a static library.
	# Implies -frtti -fexceptions.
	# gnustl_shared -> Use the GNU STL as a shared library.
	# Implies -frtti -fno-exceptions.
	# Available for NDK r7b and newer.
	# Silently degrades to gnustl_static if not available.
	# c++_static -> Use the LLVM libc++ runtime as a static library.
	# Implies -frtti -fexceptions.
	# c++_shared -> Use the LLVM libc++ runtime as a shared library.
	# Implies -frtti -fno-exceptions.
	#
	# ANDROID_STL_FORCE_FEATURES=ON - turn rtti and exceptions support based on
	# chosen runtime. If disabled, then the user is responsible for settings
	# these options.
	#
	# What?:
	# android-cmake toolchain searches for NDK/toolchain in the following order:
	# ANDROID_NDK - cmake parameter
	# ANDROID_NDK - environment variable
	# ANDROID_STANDALONE_TOOLCHAIN - cmake parameter
	# ANDROID_STANDALONE_TOOLCHAIN - environment variable
	# ANDROID_NDK - default locations
	# ANDROID_STANDALONE_TOOLCHAIN - default locations
	#
	# Make sure to do the following in your scripts:
	# SET( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${my_cxx_flags}" )
	# SET( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${my_cxx_flags}" )
	# The flags will be prepopulated with critical flags, so don't loose them.
	# Also be aware that toolchain also sets configuration-specific compiler
	# flags and linker flags.
	#
	# ANDROID and BUILD_ANDROID will be set to true, you may test any of these
	# variables to make necessary Android-specific configuration changes.
	#
	# Also ARMEABI or ARMEABI_V7A or ARMEABI_V7A_HARD or X86 or MIPS or ARM64_V8A or X86_64 or MIPS64
	# will be set true, mutually exclusive. NEON option will be set true
	# if VFP is set to NEON.
	#
	# ------------------------------------------------------------------------------

	cmake_minimum_required( VERSION 2.6.3 )

	if( DEFINED CMAKE_CROSSCOMPILING )
	# subsequent toolchain loading is not really needed
	return()
	endif()

	if( CMAKE_TOOLCHAIN_FILE )
	# touch toolchain variable to suppress "unused variable" warning
	endif()

	# inherit settings in recursive loads
	get_property( _CMAKE_IN_TRY_COMPILE GLOBAL PROPERTY IN_TRY_COMPILE )
	if( _CMAKE_IN_TRY_COMPILE )
	include( "${CMAKE_CURRENT_SOURCE_DIR}/../android.toolchain.config.cmake" OPTIONAL )
	endif()

	# this one is important
	if( CMAKE_VERSION VERSION_GREATER "3.0.99" )
	set( CMAKE_SYSTEM_NAME Android )
	else()
	set( CMAKE_SYSTEM_NAME Linux )
	endif()

	# this one not so much
	set( CMAKE_SYSTEM_VERSION 1 )

	# rpath makes low sense for Android
	set( CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG "" )
	set( CMAKE_SKIP_RPATH TRUE CACHE BOOL "If set, runtime paths are not added when using shared libraries." )

	# NDK search paths
	set( ANDROID_SUPPORTED_NDK_VERSIONS ${ANDROID_EXTRA_NDK_VERSIONS} -r10d -r10c -r10b -r10 -r9d -r9c -r9b -r9 -r8e -r8d -r8c -r8b -r8 -r7c -r7b -r7 -r6b -r6 -r5c -r5b -r5 "" )
	if( NOT DEFINED ANDROID_NDK_SEARCH_PATHS )
	if( CMAKE_HOST_WIN32 )
	file( TO_CMAKE_PATH "$ENV{PROGRAMFILES}" ANDROID_NDK_SEARCH_PATHS )
	set( ANDROID_NDK_SEARCH_PATHS "${ANDROID_NDK_SEARCH_PATHS}" "$ENV{SystemDrive}/NVPACK" )
	else()
	file( TO_CMAKE_PATH "$ENV{HOME}" ANDROID_NDK_SEARCH_PATHS )
	set( ANDROID_NDK_SEARCH_PATHS /opt "${ANDROID_NDK_SEARCH_PATHS}/NVPACK" )
	endif()
	endif()
	if( NOT DEFINED ANDROID_STANDALONE_TOOLCHAIN_SEARCH_PATH )
	set( ANDROID_STANDALONE_TOOLCHAIN_SEARCH_PATH /opt/android-toolchain )
	endif()

	# known ABIs
	set( ANDROID_SUPPORTED_ABIS_arm "armeabi-v7a;armeabi;armeabi-v7a with NEON;armeabi-v7a-hard with NEON;armeabi-v7a with VFPV3;armeabi-v6 with VFP" )
	set( ANDROID_SUPPORTED_ABIS_arm64 "arm64-v8a" )
	set( ANDROID_SUPPORTED_ABIS_x86 "x86" )
	set( ANDROID_SUPPORTED_ABIS_x86_64 "x86_64" )
	set( ANDROID_SUPPORTED_ABIS_mips "mips" )
	set( ANDROID_SUPPORTED_ABIS_mips64 "mips64" )

	# API level defaults
	set( ANDROID_DEFAULT_NDK_API_LEVEL 9 )
	set( ANDROID_DEFAULT_NDK_API_LEVEL_arm64 21 )
	set( ANDROID_DEFAULT_NDK_API_LEVEL_x86 9 )
	set( ANDROID_DEFAULT_NDK_API_LEVEL_x86_64 21 )
	set( ANDROID_DEFAULT_NDK_API_LEVEL_mips 9 )
	set( ANDROID_DEFAULT_NDK_API_LEVEL_mips64 21 )


	macro( __LIST_FILTER listvar regex )
	if( ${listvar} )
	foreach( __val ${${listvar}} )
	if( __val MATCHES "${regex}" )
	list( REMOVE_ITEM ${listvar} "${__val}" )
	endif()
	endforeach()
	endif()
	endmacro()

	macro( __INIT_VARIABLE var_name )
	set( __test_path 0 )
	foreach( __var ${ARGN} )
	if( __var STREQUAL "PATH" )
	set( __test_path 1 )
	break()
	endif()
	endforeach()

	if( __test_path AND NOT EXISTS "${${var_name}}" )
	unset( ${var_name} CACHE )
	endif()

	if( " ${${var_name}}" STREQUAL " " )
	set( __values 0 )
	foreach( __var ${ARGN} )
	if( __var STREQUAL "VALUES" )
	set( __values 1 )
	elseif( NOT __var STREQUAL "PATH" )
	if( __var MATCHES "^ENV_.*$" )
	string( REPLACE "ENV_" "" __var "${__var}" )
	set( __value "$ENV{${__var}}" )
	elseif( DEFINED ${__var} )
	set( __value "${${__var}}" )
	elseif( __values )
	set( __value "${__var}" )
	else()
	set( __value "" )
	endif()

	if( NOT " ${__value}" STREQUAL " " AND (NOT __test_path OR EXISTS "${__value}") )
	set( ${var_name} "${__value}" )
	break()
	endif()
	endif()
	endforeach()
	unset( __value )
	unset( __values )
	endif()

	if( __test_path )
	file( TO_CMAKE_PATH "${${var_name}}" ${var_name} )
	endif()
	unset( __test_path )
	endmacro()

	macro( __DETECT_NATIVE_API_LEVEL _var _path )
	set( __ndkApiLevelRegex "^[\t ]#define[\t ]+__ANDROID_API__[\t ]+([0-9]+)[\t ].*$" )
	file( STRINGS ${_path} __apiFileContent REGEX "${__ndkApiLevelRegex}" )
	if( NOT __apiFileContent )
	set( __ndkApiLevelRegex "^[\t ]#define[\t ]+__ANDROID_API__[\t ]+__ANDROID_API_FUTURE__[\t ]$" )
	file( STRINGS ${_path} __apiFileContent REGEX "${__ndkApiLevelRegex}" )
	if( __apiFileContent )
	set(${_var} 10000)
	else()
	message( SEND_ERROR "Could not get Android native API level. Probably you have specified invalid level value, or your copy of NDK/toolchain is broken." )
	endif()
	else()
	string( REGEX REPLACE "${__ndkApiLevelRegex}" "\\1" ${_var} "${__apiFileContent}" )
	endif()
	unset( __apiFileContent )
	unset( __ndkApiLevelRegex )
	endmacro()

	macro( __DETECT_TOOLCHAIN_MACHINE_NAME _var _root )
	if( EXISTS "${_root}" )
	file( GLOB __gccExePath RELATIVE "${_root}/bin/" "${_root}/bin/*-gcc${TOOL_OS_SUFFIX}" )
	__LIST_FILTER( __gccExePath "^[.].*" )
	list( LENGTH __gccExePath __gccExePathsCount )
	if( NOT __gccExePathsCount EQUAL 1 AND NOT _CMAKE_IN_TRY_COMPILE )
	message( WARNING "Could not determine machine name for compiler from ${_root}" )
	set( ${_var} "" )
	else()
	get_filename_component( __gccExeName "${__gccExePath}" NAME_WE )
	string( REPLACE "-gcc" "" ${_var} "${__gccExeName}" )
	endif()
	unset( __gccExePath )
	unset( __gccExePathsCount )
	unset( __gccExeName )
	else()
	set( ${_var} "" )
	endif()
	endmacro()


	# fight against cygwin
	set( ANDROID_FORBID_SYGWIN TRUE CACHE BOOL "Prevent cmake from working under cygwin and using cygwin tools")
	mark_as_advanced( ANDROID_FORBID_SYGWIN )
	if( ANDROID_FORBID_SYGWIN )
	if( CYGWIN )
	message( FATAL_ERROR "Android NDK and android-cmake toolchain are not welcome Cygwin. It is unlikely that this cmake toolchain will work under cygwin. But if you want to try then you can set cmake variable ANDROID_FORBID_SYGWIN to FALSE and rerun cmake." )
	endif()

	if( CMAKE_HOST_WIN32 )
	# remove cygwin from PATH
	set( __new_path "$ENV{PATH}")
	__LIST_FILTER( __new_path "cygwin" )
	set(ENV{PATH} "${__new_path}")
	unset(__new_path)
	endif()
	endif()


	# detect current host platform
	if( NOT DEFINED ANDROID_NDK_HOST_X64 AND (CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "amd64\|x86_64\|AMD64" OR CMAKE_HOST_APPLE) )
	set( ANDROID_NDK_HOST_X64 1 CACHE BOOL "Try to use 64-bit compiler toolchain" )
	mark_as_advanced( ANDROID_NDK_HOST_X64 )
	endif()

	set( TOOL_OS_SUFFIX "" )
	if( CMAKE_HOST_APPLE )
	set( ANDROID_NDK_HOST_SYSTEM_NAME "darwin-x86_64" )
	set( ANDROID_NDK_HOST_SYSTEM_NAME2 "darwin-x86" )
	elseif( CMAKE_HOST_WIN32 )
	set( ANDROID_NDK_HOST_SYSTEM_NAME "windows-x86_64" )
	set( ANDROID_NDK_HOST_SYSTEM_NAME2 "windows" )
	set( TOOL_OS_SUFFIX ".exe" )
	elseif( CMAKE_HOST_UNIX )
	set( ANDROID_NDK_HOST_SYSTEM_NAME "linux-x86_64" )
	set( ANDROID_NDK_HOST_SYSTEM_NAME2 "linux-x86" )
	else()
	message( FATAL_ERROR "Cross-compilation on your platform is not supported by this cmake toolchain" )
	endif()

	if( NOT ANDROID_NDK_HOST_X64 )
	set( ANDROID_NDK_HOST_SYSTEM_NAME ${ANDROID_NDK_HOST_SYSTEM_NAME2} )
	endif()

	# see if we have path to Android NDK
	if( NOT ANDROID_NDK AND NOT ANDROID_STANDALONE_TOOLCHAIN )
	__INIT_VARIABLE( ANDROID_NDK PATH ENV_ANDROID_NDK )
	endif()
	if( NOT ANDROID_NDK )
	# see if we have path to Android standalone toolchain
	__INIT_VARIABLE( ANDROID_STANDALONE_TOOLCHAIN PATH ENV_ANDROID_STANDALONE_TOOLCHAIN )

	if( NOT ANDROID_STANDALONE_TOOLCHAIN )
	#try to find Android NDK in one of the the default locations
	set( __ndkSearchPaths )
	foreach( __ndkSearchPath ${ANDROID_NDK_SEARCH_PATHS} )
	foreach( suffix ${ANDROID_SUPPORTED_NDK_VERSIONS} )
	list( APPEND __ndkSearchPaths "${__ndkSearchPath}/android-ndk${suffix}" )
	endforeach()
	endforeach()
	__INIT_VARIABLE( ANDROID_NDK PATH VALUES ${__ndkSearchPaths} )
	unset( __ndkSearchPaths )

	if( ANDROID_NDK )
	message( STATUS "Using default path for Android NDK: ${ANDROID_NDK}" )
	message( STATUS " If you prefer to use a different location, please define a cmake or environment variable: ANDROID_NDK" )
	else()
	#try to find Android standalone toolchain in one of the the default locations
	__INIT_VARIABLE( ANDROID_STANDALONE_TOOLCHAIN PATH ANDROID_STANDALONE_TOOLCHAIN_SEARCH_PATH )

	if( ANDROID_STANDALONE_TOOLCHAIN )
	message( STATUS "Using default path for standalone toolchain ${ANDROID_STANDALONE_TOOLCHAIN}" )
	message( STATUS " If you prefer to use a different location, please define the variable: ANDROID_STANDALONE_TOOLCHAIN" )
	endif( ANDROID_STANDALONE_TOOLCHAIN )
	endif( ANDROID_NDK )
	endif( NOT ANDROID_STANDALONE_TOOLCHAIN )
	endif( NOT ANDROID_NDK )

	# remember found paths
	if( ANDROID_NDK )
	get_filename_component( ANDROID_NDK "${ANDROID_NDK}" ABSOLUTE )
	set( ANDROID_NDK "${ANDROID_NDK}" CACHE INTERNAL "Path of the Android NDK" FORCE )
	set( BUILD_WITH_ANDROID_NDK True )
	if( EXISTS "${ANDROID_NDK}/RELEASE.TXT" )
	file( STRINGS "${ANDROID_NDK}/RELEASE.TXT" ANDROID_NDK_RELEASE_FULL LIMIT_COUNT 1 REGEX "r[0-9]+[a-z]?" )
	string( REGEX MATCH "r([0-9]+)([a-z]?)" ANDROID_NDK_RELEASE "${ANDROID_NDK_RELEASE_FULL}" )
	else()
	set( ANDROID_NDK_RELEASE "r1x" )
	set( ANDROID_NDK_RELEASE_FULL "unreleased" )
	endif()
	string( REGEX REPLACE "r([0-9]+)([a-z]?)" "\\1*1000" ANDROID_NDK_RELEASE_NUM "${ANDROID_NDK_RELEASE}" )
	string( FIND " abcdefghijklmnopqastuvwxyz" "${CMAKE_MATCH_2}" __ndkReleaseLetterNum )
	math( EXPR ANDROID_NDK_RELEASE_NUM "${ANDROID_NDK_RELEASE_NUM}+${__ndkReleaseLetterNum}" )
	elseif( ANDROID_STANDALONE_TOOLCHAIN )
	get_filename_component( ANDROID_STANDALONE_TOOLCHAIN "${ANDROID_STANDALONE_TOOLCHAIN}" ABSOLUTE )
	# try to detect change
	if( CMAKE_AR )
	string( LENGTH "${ANDROID_STANDALONE_TOOLCHAIN}" __length )
	string( SUBSTRING "${CMAKE_AR}" 0 ${__length} __androidStandaloneToolchainPreviousPath )
	if( NOT __androidStandaloneToolchainPreviousPath STREQUAL ANDROID_STANDALONE_TOOLCHAIN )
	message( FATAL_ERROR "It is not possible to change path to the Android standalone toolchain on subsequent run." )
	endif()
	unset( __androidStandaloneToolchainPreviousPath )
	unset( __length )
	endif()
	set( ANDROID_STANDALONE_TOOLCHAIN "${ANDROID_STANDALONE_TOOLCHAIN}" CACHE INTERNAL "Path of the Android standalone toolchain" FORCE )
	set( BUILD_WITH_STANDALONE_TOOLCHAIN True )
	else()
	list(GET ANDROID_NDK_SEARCH_PATHS 0 ANDROID_NDK_SEARCH_PATH)
	message( FATAL_ERROR "Could not find neither Android NDK nor Android standalone toolchain.
	You should either set an environment variable:
	export ANDROID_NDK=~/my-android-ndk
	or
	export ANDROID_STANDALONE_TOOLCHAIN=~/my-android-toolchain
	or put the toolchain or NDK in the default path:
	sudo ln -s ~/my-android-ndk ${ANDROID_NDK_SEARCH_PATH}/android-ndk
	sudo ln -s ~/my-android-toolchain ${ANDROID_STANDALONE_TOOLCHAIN_SEARCH_PATH}" )
	endif()

	# android NDK layout
	if( BUILD_WITH_ANDROID_NDK )
	if( NOT DEFINED ANDROID_NDK_LAYOUT )
	# try to automatically detect the layout
	if( EXISTS "${ANDROID_NDK}/RELEASE.TXT")
	set( ANDROID_NDK_LAYOUT "RELEASE" )
	elseif( EXISTS "${ANDROID_NDK}/../../linux-x86/toolchain/" )
	set( ANDROID_NDK_LAYOUT "LINARO" )
	elseif( EXISTS "${ANDROID_NDK}/../../gcc/" )
	set( ANDROID_NDK_LAYOUT "ANDROID" )
	endif()
	endif()
	set( ANDROID_NDK_LAYOUT "${ANDROID_NDK_LAYOUT}" CACHE STRING "The inner layout of NDK" )
	mark_as_advanced( ANDROID_NDK_LAYOUT )
	if( ANDROID_NDK_LAYOUT STREQUAL "LINARO" )
	set( ANDROID_NDK_HOST_SYSTEM_NAME ${ANDROID_NDK_HOST_SYSTEM_NAME2} ) # only 32-bit at the moment
	set( ANDROID_NDK_TOOLCHAINS_PATH "${ANDROID_NDK}/../../${ANDROID_NDK_HOST_SYSTEM_NAME}/toolchain" )
	set( ANDROID_NDK_TOOLCHAINS_SUBPATH "" )
	set( ANDROID_NDK_TOOLCHAINS_SUBPATH2 "" )
	elseif( ANDROID_NDK_LAYOUT STREQUAL "ANDROID" )
	set( ANDROID_NDK_HOST_SYSTEM_NAME ${ANDROID_NDK_HOST_SYSTEM_NAME2} ) # only 32-bit at the moment
	set( ANDROID_NDK_TOOLCHAINS_PATH "${ANDROID_NDK}/../../gcc/${ANDROID_NDK_HOST_SYSTEM_NAME}/arm" )
	set( ANDROID_NDK_TOOLCHAINS_SUBPATH "" )
	set( ANDROID_NDK_TOOLCHAINS_SUBPATH2 "" )
	else() # ANDROID_NDK_LAYOUT STREQUAL "RELEASE"
	set( ANDROID_NDK_TOOLCHAINS_PATH "${ANDROID_NDK}/toolchains" )
	set( ANDROID_NDK_TOOLCHAINS_SUBPATH "/prebuilt/${ANDROID_NDK_HOST_SYSTEM_NAME}" )
	set( ANDROID_NDK_TOOLCHAINS_SUBPATH2 "/prebuilt/${ANDROID_NDK_HOST_SYSTEM_NAME2}" )
	endif()
	get_filename_component( ANDROID_NDK_TOOLCHAINS_PATH "${ANDROID_NDK_TOOLCHAINS_PATH}" ABSOLUTE )

	# try to detect change of NDK
	if( CMAKE_AR )
	string( LENGTH "${ANDROID_NDK_TOOLCHAINS_PATH}" __length )
	string( SUBSTRING "${CMAKE_AR}" 0 ${__length} __androidNdkPreviousPath )
	if( NOT __androidNdkPreviousPath STREQUAL ANDROID_NDK_TOOLCHAINS_PATH )
	message( FATAL_ERROR "It is not possible to change the path to the NDK on subsequent CMake run. You must remove all generated files from your build folder first.
	" )
	endif()
	unset( __androidNdkPreviousPath )
	unset( __length )
	endif()
	endif()


	# get all the details about standalone toolchain
	if( BUILD_WITH_STANDALONE_TOOLCHAIN )
	__DETECT_NATIVE_API_LEVEL( ANDROID_SUPPORTED_NATIVE_API_LEVELS "${ANDROID_STANDALONE_TOOLCHAIN}/sysroot/usr/include/android/api-level.h" )
	set( ANDROID_STANDALONE_TOOLCHAIN_API_LEVEL ${ANDROID_SUPPORTED_NATIVE_API_LEVELS} )
	set( __availableToolchains "standalone" )
	__DETECT_TOOLCHAIN_MACHINE_NAME( __availableToolchainMachines "${ANDROID_STANDALONE_TOOLCHAIN}" )
	if( NOT __availableToolchainMachines )
	message( FATAL_ERROR "Could not determine machine name of your toolchain. Probably your Android standalone toolchain is broken." )
	endif()
	if( __availableToolchainMachines MATCHES x86_64 )
	set( __availableToolchainArchs "x86_64" )
	elseif( __availableToolchainMachines MATCHES i686 )
	set( __availableToolchainArchs "x86" )
	elseif( __availableToolchainMachines MATCHES aarch64 )
	set( __availableToolchainArchs "arm64" )
	elseif( __availableToolchainMachines MATCHES arm )
	set( __availableToolchainArchs "arm" )
	elseif( __availableToolchainMachines MATCHES mips64el )
	set( __availableToolchainArchs "mips64" )
	elseif( __availableToolchainMachines MATCHES mipsel )
	set( __availableToolchainArchs "mips" )
	endif()
	execute_process( COMMAND "${ANDROID_STANDALONE_TOOLCHAIN}/bin/${__availableToolchainMachines}-gcc${TOOL_OS_SUFFIX}" -dumpversion
	OUTPUT_VARIABLE __availableToolchainCompilerVersions OUTPUT_STRIP_TRAILING_WHITESPACE )
	string( REGEX MATCH "[0-9]+[.][0-9]+([.][0-9]+)?" __availableToolchainCompilerVersions "${__availableToolchainCompilerVersions}" )
	if( EXISTS "${ANDROID_STANDALONE_TOOLCHAIN}/bin/clang${TOOL_OS_SUFFIX}" )
	list( APPEND __availableToolchains "standalone-clang" )
	list( APPEND __availableToolchainMachines ${__availableToolchainMachines} )
	list( APPEND __availableToolchainArchs ${__availableToolchainArchs} )
	list( APPEND __availableToolchainCompilerVersions ${__availableToolchainCompilerVersions} )
	endif()
	endif()

	macro( __GLOB_NDK_TOOLCHAINS __availableToolchainsVar __availableToolchainsLst __toolchain_subpath )
	foreach( __toolchain ${${__availableToolchainsLst}} )
	if( "${__toolchain}" MATCHES "-clang3[.][0-9]$" AND NOT EXISTS "${ANDROID_NDK_TOOLCHAINS_PATH}/${__toolchain}${__toolchain_subpath}" )
	SET( __toolchainVersionRegex "^TOOLCHAIN_VERSION[\t ]+:=[\t ]+(.*)$" )
	FILE( STRINGS "${ANDROID_NDK_TOOLCHAINS_PATH}/${__toolchain}/setup.mk" __toolchainVersionStr REGEX "${__toolchainVersionRegex}" )
	if( __toolchainVersionStr )
	string( REGEX REPLACE "${__toolchainVersionRegex}" "\\1" __toolchainVersionStr "${__toolchainVersionStr}" )
	string( REGEX REPLACE "-clang3[.][0-9]$" "-${__toolchainVersionStr}" __gcc_toolchain "${__toolchain}" )
	else()
	string( REGEX REPLACE "-clang3[.][0-9]$" "-4.6" __gcc_toolchain "${__toolchain}" )
	endif()
	unset( __toolchainVersionStr )
	unset( __toolchainVersionRegex )
	else()
	set( __gcc_toolchain "${__toolchain}" )
	endif()
	__DETECT_TOOLCHAIN_MACHINE_NAME( __machine "${ANDROID_NDK_TOOLCHAINS_PATH}/${__gcc_toolchain}${__toolchain_subpath}" )
	if( __machine )
	string( REGEX MATCH "[0-9]+[.][0-9]+([.][0-9x]+)?$" __version "${__gcc_toolchain}" )
	if( __machine MATCHES x86_64 )
	set( __arch "x86_64" )
	elseif( __machine MATCHES i686 )
	set( __arch "x86" )
	elseif( __machine MATCHES aarch64 )
	set( __arch "arm64" )
	elseif( __machine MATCHES arm )
	set( __arch "arm" )
	elseif( __machine MATCHES mips64el )
	set( __arch "mips64" )
	elseif( __machine MATCHES mipsel )
	set( __arch "mips" )
	else()
	set( __arch "" )
	endif()
	#message("machine: !${__machine}!\narch: !${__arch}!\nversion: !${__version}!\ntoolchain: !${__toolchain}!\n")
	if (__arch)
	list( APPEND __availableToolchainMachines "${__machine}" )
	list( APPEND __availableToolchainArchs "${__arch}" )
	list( APPEND __availableToolchainCompilerVersions "${__version}" )
	list( APPEND ${__availableToolchainsVar} "${__toolchain}" )
	endif()
	endif()
	unset( __gcc_toolchain )
	endforeach()
	endmacro()

	# get all the details about NDK
	if( BUILD_WITH_ANDROID_NDK )
	file( GLOB ANDROID_SUPPORTED_NATIVE_API_LEVELS RELATIVE "${ANDROID_NDK}/platforms" "${ANDROID_NDK}/platforms/android-*" )
	string( REPLACE "android-" "" ANDROID_SUPPORTED_NATIVE_API_LEVELS "${ANDROID_SUPPORTED_NATIVE_API_LEVELS}" )
	set( __availableToolchains "" )
	set( __availableToolchainMachines "" )
	set( __availableToolchainArchs "" )
	set( __availableToolchainCompilerVersions "" )
	if( ANDROID_TOOLCHAIN_NAME AND EXISTS "${ANDROID_NDK_TOOLCHAINS_PATH}/${ANDROID_TOOLCHAIN_NAME}/" )
	# do not go through all toolchains if we know the name
	set( __availableToolchainsLst "${ANDROID_TOOLCHAIN_NAME}" )
	__GLOB_NDK_TOOLCHAINS( __availableToolchains __availableToolchainsLst "${ANDROID_NDK_TOOLCHAINS_SUBPATH}" )
	if( NOT __availableToolchains AND NOT ANDROID_NDK_TOOLCHAINS_SUBPATH STREQUAL ANDROID_NDK_TOOLCHAINS_SUBPATH2 )
	__GLOB_NDK_TOOLCHAINS( __availableToolchains __availableToolchainsLst "${ANDROID_NDK_TOOLCHAINS_SUBPATH2}" )
	if( __availableToolchains )
	set( ANDROID_NDK_TOOLCHAINS_SUBPATH ${ANDROID_NDK_TOOLCHAINS_SUBPATH2} )
	endif()
	endif()
	endif()
	if( NOT __availableToolchains )
	file( GLOB __availableToolchainsLst RELATIVE "${ANDROID_NDK_TOOLCHAINS_PATH}" "${ANDROID_NDK_TOOLCHAINS_PATH}/*" )
	if( __availableToolchainsLst )
	list(SORT __availableToolchainsLst) # we need clang to go after gcc
	endif()
	__LIST_FILTER( __availableToolchainsLst "^[.]" )
	__LIST_FILTER( __availableToolchainsLst "llvm" )
	__LIST_FILTER( __availableToolchainsLst "renderscript" )
	__GLOB_NDK_TOOLCHAINS( __availableToolchains __availableToolchainsLst "${ANDROID_NDK_TOOLCHAINS_SUBPATH}" )
	if( NOT __availableToolchains AND NOT ANDROID_NDK_TOOLCHAINS_SUBPATH STREQUAL ANDROID_NDK_TOOLCHAINS_SUBPATH2 )
	__GLOB_NDK_TOOLCHAINS( __availableToolchains __availableToolchainsLst "${ANDROID_NDK_TOOLCHAINS_SUBPATH2}" )
	if( __availableToolchains )
	set( ANDROID_NDK_TOOLCHAINS_SUBPATH ${ANDROID_NDK_TOOLCHAINS_SUBPATH2} )
	endif()
	endif()
	endif()
	if( NOT __availableToolchains )
	message( FATAL_ERROR "Could not find any working toolchain in the NDK. Probably your Android NDK is broken." )
	endif()
	endif()

	# build list of available ABIs
	set( ANDROID_SUPPORTED_ABIS "" )
	set( __uniqToolchainArchNames ${__availableToolchainArchs} )
	list( REMOVE_DUPLICATES __uniqToolchainArchNames )
	list( SORT __uniqToolchainArchNames )
	foreach( __arch ${__uniqToolchainArchNames} )
	list( APPEND ANDROID_SUPPORTED_ABIS ${ANDROID_SUPPORTED_ABIS_${__arch}} )
	endforeach()
	unset( __uniqToolchainArchNames )
	if( NOT ANDROID_SUPPORTED_ABIS )
	message( FATAL_ERROR "No one of known Android ABIs is supported by this cmake toolchain." )
	endif()

	# choose target ABI
	__INIT_VARIABLE( ANDROID_ABI VALUES ${ANDROID_SUPPORTED_ABIS} )
	# verify that target ABI is supported
	list( FIND ANDROID_SUPPORTED_ABIS "${ANDROID_ABI}" __androidAbiIdx )
	if( __androidAbiIdx EQUAL -1 )
	string( REPLACE ";" "\", \"" PRINTABLE_ANDROID_SUPPORTED_ABIS "${ANDROID_SUPPORTED_ABIS}" )
	message( FATAL_ERROR "Specified ANDROID_ABI = \"${ANDROID_ABI}\" is not supported by this cmake toolchain or your NDK/toolchain.
	Supported values are: \"${PRINTABLE_ANDROID_SUPPORTED_ABIS}\"
	" )
	endif()
	unset( __androidAbiIdx )

	# set target ABI options
	if( ANDROID_ABI STREQUAL "x86" )
	set( X86 true )
	set( ANDROID_NDK_ABI_NAME "x86" )
	set( ANDROID_ARCH_NAME "x86" )
	set( ANDROID_LLVM_TRIPLE "i686-none-linux-android" )
	set( CMAKE_SYSTEM_PROCESSOR "i686" )
	elseif( ANDROID_ABI STREQUAL "x86_64" )
	set( X86 true )
	set( X86_64 true )
	set( ANDROID_NDK_ABI_NAME "x86_64" )
	set( ANDROID_ARCH_NAME "x86_64" )
	set( CMAKE_SYSTEM_PROCESSOR "x86_64" )
	set( ANDROID_LLVM_TRIPLE "x86_64-none-linux-android" )
	elseif( ANDROID_ABI STREQUAL "mips64" )
	set( MIPS64 true )
	set( ANDROID_NDK_ABI_NAME "mips64" )
	set( ANDROID_ARCH_NAME "mips64" )
	set( ANDROID_LLVM_TRIPLE "mips64el-none-linux-android" )
	set( CMAKE_SYSTEM_PROCESSOR "mips64" )
	elseif( ANDROID_ABI STREQUAL "mips" )
	set( MIPS true )
	set( ANDROID_NDK_ABI_NAME "mips" )
	set( ANDROID_ARCH_NAME "mips" )
	set( ANDROID_LLVM_TRIPLE "mipsel-none-linux-android" )
	set( CMAKE_SYSTEM_PROCESSOR "mips" )
	elseif( ANDROID_ABI STREQUAL "arm64-v8a" )
	set( ARM64_V8A true )
	set( ANDROID_NDK_ABI_NAME "arm64-v8a" )
	set( ANDROID_ARCH_NAME "arm64" )
	set( ANDROID_LLVM_TRIPLE "aarch64-none-linux-android" )
	set( CMAKE_SYSTEM_PROCESSOR "aarch64" )
	set( VFPV3 true )
	set( NEON true )
	elseif( ANDROID_ABI STREQUAL "armeabi" )
	set( ARMEABI true )
	set( ANDROID_NDK_ABI_NAME "armeabi" )
	set( ANDROID_ARCH_NAME "arm" )
	set( ANDROID_LLVM_TRIPLE "armv5te-none-linux-androideabi" )
	set( CMAKE_SYSTEM_PROCESSOR "armv5te" )
	elseif( ANDROID_ABI STREQUAL "armeabi-v6 with VFP" )
	set( ARMEABI_V6 true )
	set( ANDROID_NDK_ABI_NAME "armeabi" )
	set( ANDROID_ARCH_NAME "arm" )
	set( ANDROID_LLVM_TRIPLE "armv5te-none-linux-androideabi" )
	set( CMAKE_SYSTEM_PROCESSOR "armv6" )
	# need always fallback to older platform
	set( ARMEABI true )
	elseif( ANDROID_ABI STREQUAL "armeabi-v7a")
	set( ARMEABI_V7A true )
	set( ANDROID_NDK_ABI_NAME "armeabi-v7a" )
	set( ANDROID_ARCH_NAME "arm" )
	set( ANDROID_LLVM_TRIPLE "armv7-none-linux-androideabi" )
	set( CMAKE_SYSTEM_PROCESSOR "armv7-a" )
	elseif( ANDROID_ABI STREQUAL "armeabi-v7a with VFPV3" )
	set( ARMEABI_V7A true )
	set( ANDROID_NDK_ABI_NAME "armeabi-v7a" )
	set( ANDROID_ARCH_NAME "arm" )
	set( ANDROID_LLVM_TRIPLE "armv7-none-linux-androideabi" )
	set( CMAKE_SYSTEM_PROCESSOR "armv7-a" )
	set( VFPV3 true )
	elseif( ANDROID_ABI STREQUAL "armeabi-v7a with NEON" )
	set( ARMEABI_V7A true )
	set( ANDROID_NDK_ABI_NAME "armeabi-v7a" )
	set( ANDROID_ARCH_NAME "arm" )
	set( ANDROID_LLVM_TRIPLE "armv7-none-linux-androideabi" )
	set( CMAKE_SYSTEM_PROCESSOR "armv7-a" )
	set( VFPV3 true )
	set( NEON true )
	elseif( ANDROID_ABI STREQUAL "armeabi-v7a-hard with NEON" )
	set( ARMEABI_V7A_HARD true )
	set( ANDROID_NDK_ABI_NAME "armeabi-v7a-hard" )
	set( ANDROID_ARCH_NAME "arm" )
	set( ANDROID_LLVM_TRIPLE "armv7-none-linux-androideabi" )
	set( CMAKE_SYSTEM_PROCESSOR "armv7-a" )
	set( VFPV3 true )
	set( NEON true )
	else()
	message( SEND_ERROR "Unknown ANDROID_ABI=\"${ANDROID_ABI}\" is specified." )
	endif()

	if( CMAKE_BINARY_DIR AND EXISTS "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeSystem.cmake" )
	# really dirty hack
	# it is not possible to change CMAKE_SYSTEM_PROCESSOR after the first run...
	file( APPEND "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeSystem.cmake" "SET(CMAKE_SYSTEM_PROCESSOR \"${CMAKE_SYSTEM_PROCESSOR}\")\n" )
	endif()

	if( ANDROID_ARCH_NAME STREQUAL "arm" AND NOT ARMEABI_V6 )
	__INIT_VARIABLE( ANDROID_FORCE_ARM_BUILD VALUES OFF )
	set( ANDROID_FORCE_ARM_BUILD ${ANDROID_FORCE_ARM_BUILD} CACHE BOOL "Use 32-bit ARM instructions instead of Thumb-1" FORCE )
	mark_as_advanced( ANDROID_FORCE_ARM_BUILD )
	else()
	unset( ANDROID_FORCE_ARM_BUILD CACHE )
	endif()

	# choose toolchain
	if( ANDROID_TOOLCHAIN_NAME )
	list( FIND __availableToolchains "${ANDROID_TOOLCHAIN_NAME}" __toolchainIdx )
	if( __toolchainIdx EQUAL -1 )
	list( SORT __availableToolchains )
	string( REPLACE ";" "\n * " toolchains_list "${__availableToolchains}" )
	set( toolchains_list " * ${toolchains_list}")
	message( FATAL_ERROR "Specified toolchain \"${ANDROID_TOOLCHAIN_NAME}\" is missing in your NDK or broken. Please verify that your NDK is working or select another compiler toolchain.
	To configure the toolchain set CMake variable ANDROID_TOOLCHAIN_NAME to one of the following values:\n${toolchains_list}\n" )
	endif()
	list( GET __availableToolchainArchs ${__toolchainIdx} __toolchainArch )
	if( NOT __toolchainArch STREQUAL ANDROID_ARCH_NAME )
	message( SEND_ERROR "Selected toolchain \"${ANDROID_TOOLCHAIN_NAME}\" is not able to compile binaries for the \"${ANDROID_ARCH_NAME}\" platform." )
	endif()
	else()
	set( __toolchainIdx -1 )
	set( __applicableToolchains "" )
	set( __toolchainMaxVersion "0.0.0" )
	list( LENGTH __availableToolchains __availableToolchainsCount )
	math( EXPR __availableToolchainsCount "${__availableToolchainsCount}-1" )
	foreach( __idx RANGE ${__availableToolchainsCount} )
	list( GET __availableToolchainArchs ${__idx} __toolchainArch )
	if( __toolchainArch STREQUAL ANDROID_ARCH_NAME )
	list( GET __availableToolchainCompilerVersions ${__idx} __toolchainVersion )
	string( REPLACE "x" "99" __toolchainVersion "${__toolchainVersion}")
	if( __toolchainVersion VERSION_GREATER __toolchainMaxVersion )
	set( __toolchainMaxVersion "${__toolchainVersion}" )
	set( __toolchainIdx ${__idx} )
	endif()
	endif()
	endforeach()
	unset( __availableToolchainsCount )
	unset( __toolchainMaxVersion )
	unset( __toolchainVersion )
	endif()
	unset( __toolchainArch )
	if( __toolchainIdx EQUAL -1 )
	message( FATAL_ERROR "No one of available compiler toolchains is able to compile for ${ANDROID_ARCH_NAME} platform." )
	endif()
	list( GET __availableToolchains ${__toolchainIdx} ANDROID_TOOLCHAIN_NAME )
	list( GET __availableToolchainMachines ${__toolchainIdx} ANDROID_TOOLCHAIN_MACHINE_NAME )
	list( GET __availableToolchainCompilerVersions ${__toolchainIdx} ANDROID_COMPILER_VERSION )

	unset( __toolchainIdx )
	unset( __availableToolchains )
	unset( __availableToolchainMachines )
	unset( __availableToolchainArchs )
	unset( __availableToolchainCompilerVersions )

	# choose native API level
	__INIT_VARIABLE( ANDROID_NATIVE_API_LEVEL ENV_ANDROID_NATIVE_API_LEVEL ANDROID_API_LEVEL ENV_ANDROID_API_LEVEL ANDROID_STANDALONE_TOOLCHAIN_API_LEVEL ANDROID_DEFAULT_NDK_API_LEVEL_${ANDROID_ARCH_NAME} ANDROID_DEFAULT_NDK_API_LEVEL )
	string( REPLACE "android-" "" ANDROID_NATIVE_API_LEVEL "${ANDROID_NATIVE_API_LEVEL}" )
	string( STRIP "${ANDROID_NATIVE_API_LEVEL}" ANDROID_NATIVE_API_LEVEL )
	# adjust API level
	set( __real_api_level ${ANDROID_DEFAULT_NDK_API_LEVEL_${ANDROID_ARCH_NAME}} )
	foreach( __level ${ANDROID_SUPPORTED_NATIVE_API_LEVELS} )
	if( (__level LESS ANDROID_NATIVE_API_LEVEL OR __level STREQUAL ANDROID_NATIVE_API_LEVEL) AND NOT __level LESS __real_api_level )
	set( __real_api_level ${__level} )
	endif()
	endforeach()
	if( __real_api_level AND NOT ANDROID_NATIVE_API_LEVEL STREQUAL __real_api_level )
	message( STATUS "Adjusting Android API level 'android-${ANDROID_NATIVE_API_LEVEL}' to 'android-${__real_api_level}'")
	set( ANDROID_NATIVE_API_LEVEL ${__real_api_level} )
	endif()
	unset(__real_api_level)
	# validate
	list( FIND ANDROID_SUPPORTED_NATIVE_API_LEVELS "${ANDROID_NATIVE_API_LEVEL}" __levelIdx )
	if( __levelIdx EQUAL -1 )
	message( SEND_ERROR "Specified Android native API level 'android-${ANDROID_NATIVE_API_LEVEL}' is not supported by your NDK/toolchain.\nSupported values of ANDROID_NATIVE_API_LEVEL: ${ANDROID_SUPPORTED_NATIVE_API_LEVELS}" )
	else()
	if( BUILD_WITH_ANDROID_NDK )
	if(EXISTS "${ANDROID_NDK}/platforms/android-${ANDROID_NATIVE_API_LEVEL}/arch-${ANDROID_ARCH_NAME}/usr/include/android/api-level.h")
	__DETECT_NATIVE_API_LEVEL( __realApiLevel "${ANDROID_NDK}/platforms/android-${ANDROID_NATIVE_API_LEVEL}/arch-${ANDROID_ARCH_NAME}/usr/include/android/api-level.h" )
	else()
	__DETECT_NATIVE_API_LEVEL( __realApiLevel "${ANDROID_NDK}/sysroot/usr/include/android/api-level.h")
	endif()

	if( NOT __realApiLevel EQUAL ANDROID_NATIVE_API_LEVEL AND NOT __realApiLevel GREATER 9000 )
	message( SEND_ERROR "Specified Android API level (${ANDROID_NATIVE_API_LEVEL}) does not match to the level found (${__realApiLevel}). Probably your copy of NDK is broken." )
	endif()
	unset( __realApiLevel )
	endif()
	set( ANDROID_NATIVE_API_LEVEL "${ANDROID_NATIVE_API_LEVEL}" CACHE STRING "Android API level for native code" FORCE )
	set( CMAKE_ANDROID_API ${ANDROID_NATIVE_API_LEVEL} )
	if( CMAKE_VERSION VERSION_GREATER "2.8" )
	list( SORT ANDROID_SUPPORTED_NATIVE_API_LEVELS )
	set_property( CACHE ANDROID_NATIVE_API_LEVEL PROPERTY STRINGS ${ANDROID_SUPPORTED_NATIVE_API_LEVELS} )
	endif()
	endif()
	unset( __levelIdx )


	# remember target ABI
	set( ANDROID_ABI "${ANDROID_ABI}" CACHE STRING "The target ABI for Android. If arm, then armeabi-v7a is recommended for hardware floating point." FORCE )
	if( CMAKE_VERSION VERSION_GREATER "2.8" )
	list( SORT ANDROID_SUPPORTED_ABIS_${ANDROID_ARCH_NAME} )
	set_property( CACHE ANDROID_ABI PROPERTY STRINGS ${ANDROID_SUPPORTED_ABIS_${ANDROID_ARCH_NAME}} )
	endif()


	# runtime choice (STL, rtti, exceptions)
	if( NOT ANDROID_STL )
	set( ANDROID_STL gnustl_static )
	endif()
	set( ANDROID_STL "${ANDROID_STL}" CACHE STRING "C++ runtime" )
	set( ANDROID_STL_FORCE_FEATURES ON CACHE BOOL "automatically configure rtti and exceptions support based on C++ runtime" )
	mark_as_advanced( ANDROID_STL ANDROID_STL_FORCE_FEATURES )

	if( BUILD_WITH_ANDROID_NDK )
	if( NOT "${ANDROID_STL}" MATCHES "^(none\|system\|system_re\|gabi\\+\\+_static\|gabi\\+\\+_shared\|stlport_static\|stlport_shared\|gnustl_static\|gnustl_shared\|c\\+\\+_static\|c\\+\\+_shared)$")
	message( FATAL_ERROR "ANDROID_STL is set to invalid value \"${ANDROID_STL}\".
	The possible values are:
	none -> Do not configure the runtime.
	system -> Use the default minimal system C++ runtime library.
	system_re -> Same as system but with rtti and exceptions.
	gabi++_static -> Use the GAbi++ runtime as a static library.
	gabi++_shared -> Use the GAbi++ runtime as a shared library.
	stlport_static -> Use the STLport runtime as a static library.
	stlport_shared -> Use the STLport runtime as a shared library.
	gnustl_static -> (default) Use the GNU STL as a static library.
	gnustl_shared -> Use the GNU STL as a shared library.
	c++_shared -> Use the LLVM libc++ runtime as a shared library.
	c++_static -> Use the LLVM libc++ runtime as a static library.
	" )
	endif()
	elseif( BUILD_WITH_STANDALONE_TOOLCHAIN )
	if( NOT "${ANDROID_STL}" MATCHES "^(none\|gnustl_static\|gnustl_shared\|c\\+\\+_static\|c\\+\\+_shared)$")
	message( FATAL_ERROR "ANDROID_STL is set to invalid value \"${ANDROID_STL}\".
	The possible values are:
	none -> Do not configure the runtime.
	gnustl_static -> (default) Use the GNU STL as a static library.
	gnustl_shared -> Use the GNU STL as a shared library.
	c++_shared -> Use the LLVM libc++ runtime as a shared library.
	c++_static -> Use the LLVM libc++ runtime as a static library.
	" )
	endif()
	endif()

	unset( ANDROID_RTTI )
	unset( ANDROID_EXCEPTIONS )
	unset( ANDROID_STL_INCLUDE_DIRS )
	unset( __libstl )
	unset( __libsupcxx )

	if( NOT _CMAKE_IN_TRY_COMPILE AND ANDROID_NDK_RELEASE STREQUAL "r7b" AND ARMEABI_V7A AND NOT VFPV3 AND ANDROID_STL MATCHES "gnustl" )
	message( WARNING "The GNU STL armeabi-v7a binaries from NDK r7b can crash non-NEON devices. The files provided with NDK r7b were not configured properly, resulting in crashes on Tegra2-based devices and others when trying to use certain floating-point functions (e.g., cosf, sinf, expf).
	You are strongly recommended to switch to another NDK release.
	" )
	endif()

	if( NOT _CMAKE_IN_TRY_COMPILE AND X86 AND ANDROID_STL MATCHES "gnustl" AND ANDROID_NDK_RELEASE STREQUAL "r6" )
	message( WARNING "The x86 system header file from NDK r6 has incorrect definition for ptrdiff_t. You are recommended to upgrade to a newer NDK release or manually patch the header:
	See https://android.googlesource.com/platform/development.git f907f4f9d4e56ccc8093df6fee54454b8bcab6c2
	diff --git a/ndk/platforms/android-9/arch-x86/include/machine/_types.h b/ndk/platforms/android-9/arch-x86/include/machine/_types.h
	index 5e28c64..65892a1 100644
	--- a/ndk/platforms/android-9/arch-x86/include/machine/_types.h
	+++ b/ndk/platforms/android-9/arch-x86/include/machine/_types.h
	@@ -51,7 +51,11 @@ typedef long int ssize_t;
	#endif
	#ifndef _PTRDIFF_T
	#define _PTRDIFF_T
	-typedef long ptrdiff_t;
	+# ifdef __ANDROID__
	+ typedef int ptrdiff_t;
	+# else
	+ typedef long ptrdiff_t;
	+# endif
	#endif
	" )
	endif()


	# setup paths and STL for standalone toolchain
	if( BUILD_WITH_STANDALONE_TOOLCHAIN )
	set( ANDROID_TOOLCHAIN_ROOT "${ANDROID_STANDALONE_TOOLCHAIN}" )
	set( ANDROID_CLANG_TOOLCHAIN_ROOT "${ANDROID_STANDALONE_TOOLCHAIN}" )
	set( ANDROID_SYSROOT "${ANDROID_STANDALONE_TOOLCHAIN}/sysroot" )
	set( ANDROID_SYSROOT_INCLUDE "${ANDROID_STANDALONE_TOOLCHAIN}/sysroot/usr/include" )

	if( NOT ANDROID_STL STREQUAL "none" )
	set( ANDROID_STL_INCLUDE_DIRS "${ANDROID_STANDALONE_TOOLCHAIN}/include/c++/${ANDROID_COMPILER_VERSION}" )
	if( NOT EXISTS "${ANDROID_STL_INCLUDE_DIRS}" )
	# old location ( pre r8c )
	set( ANDROID_STL_INCLUDE_DIRS "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/include/c++/${ANDROID_COMPILER_VERSION}" )
	endif()
	if( (ARMEABI_V7A OR ARMEABI_V7A_HARD) AND EXISTS "${ANDROID_STL_INCLUDE_DIRS}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/${CMAKE_SYSTEM_PROCESSOR}/bits" )
	list( APPEND ANDROID_STL_INCLUDE_DIRS "${ANDROID_STL_INCLUDE_DIRS}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/${CMAKE_SYSTEM_PROCESSOR}" )
	elseif( ARMEABI AND NOT ANDROID_FORCE_ARM_BUILD AND EXISTS "${ANDROID_STL_INCLUDE_DIRS}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/thumb/bits" )
	list( APPEND ANDROID_STL_INCLUDE_DIRS "${ANDROID_STL_INCLUDE_DIRS}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/thumb" )
	else()
	list( APPEND ANDROID_STL_INCLUDE_DIRS "${ANDROID_STL_INCLUDE_DIRS}/${ANDROID_TOOLCHAIN_MACHINE_NAME}" )
	endif()
	# always search static GNU STL to get the location of libsupc++.a
	if( (ARMEABI_V7A OR ARMEABI_V7A_HARD) AND NOT ANDROID_FORCE_ARM_BUILD AND EXISTS "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}/thumb/libstdc++.a" )
	set( __libstl "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}/thumb" )
	elseif( (ARMEABI_V7A OR ARMEABI_V7A_HARD) AND EXISTS "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}/libstdc++.a" )
	set( __libstl "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}" )
	elseif( ARMEABI AND NOT ANDROID_FORCE_ARM_BUILD AND EXISTS "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/thumb/libstdc++.a" )
	set( __libstl "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/thumb" )
	elseif( EXISTS "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/libstdc++.a" )
	set( __libstl "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib" )
	endif()
	if( __libstl )
	set( __libsupcxx "${__libstl}/libsupc++.a" )
	set( __libstl "${__libstl}/libstdc++.a" )
	endif()
	if( NOT EXISTS "${__libsupcxx}" )
	message( FATAL_ERROR "The required libstdsupc++.a is missing in your standalone toolchain.
	Usually it happens because of bug in make-standalone-toolchain.sh script from NDK r7, r7b and r7c.
	You need to either upgrade to newer NDK or manually copy
	$ANDROID_NDK/sources/cxx-stl/gnu-libstdc++/libs/${ANDROID_NDK_ABI_NAME}/libsupc++.a
	to
	${__libsupcxx}
	" )
	endif()
	if( ANDROID_STL STREQUAL "gnustl_shared" )
	if( (ARMEABI_V7A OR ARMEABI_V7A_HARD) AND EXISTS "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}/libgnustl_shared.so" )
	set( __libstl "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}/libgnustl_shared.so" )
	elseif( ARMEABI AND NOT ANDROID_FORCE_ARM_BUILD AND EXISTS "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/thumb/libgnustl_shared.so" )
	set( __libstl "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/thumb/libgnustl_shared.so" )
	elseif( EXISTS "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/libgnustl_shared.so" )
	set( __libstl "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/libgnustl_shared.so" )
	endif()
	endif()
	endif()
	endif()

	# clang
	if( "${ANDROID_TOOLCHAIN_NAME}" STREQUAL "standalone-clang" )
	set( ANDROID_COMPILER_IS_CLANG 1 )
	execute_process( COMMAND "${ANDROID_CLANG_TOOLCHAIN_ROOT}/bin/clang${TOOL_OS_SUFFIX}" --version OUTPUT_VARIABLE ANDROID_CLANG_VERSION OUTPUT_STRIP_TRAILING_WHITESPACE )
	string( REGEX MATCH "[0-9]+[.][0-9]+" ANDROID_CLANG_VERSION "${ANDROID_CLANG_VERSION}")
	elseif( "${ANDROID_TOOLCHAIN_NAME}" MATCHES "-clang3[.][0-9]?$" )
	string( REGEX MATCH "3[.][0-9]$" ANDROID_CLANG_VERSION "${ANDROID_TOOLCHAIN_NAME}")
	string( REGEX REPLACE "-clang${ANDROID_CLANG_VERSION}$" "-${ANDROID_COMPILER_VERSION}" ANDROID_GCC_TOOLCHAIN_NAME "${ANDROID_TOOLCHAIN_NAME}" )
	if( NOT EXISTS "${ANDROID_NDK_TOOLCHAINS_PATH}/llvm-${ANDROID_CLANG_VERSION}${ANDROID_NDK_TOOLCHAINS_SUBPATH}/bin/clang${TOOL_OS_SUFFIX}" )
	message( FATAL_ERROR "Could not find the Clang compiler driver" )
	endif()
	set( ANDROID_COMPILER_IS_CLANG 1 )
	set( ANDROID_CLANG_TOOLCHAIN_ROOT "${ANDROID_NDK_TOOLCHAINS_PATH}/llvm-${ANDROID_CLANG_VERSION}${ANDROID_NDK_TOOLCHAINS_SUBPATH}" )
	else()
	set( ANDROID_GCC_TOOLCHAIN_NAME "${ANDROID_TOOLCHAIN_NAME}" )
	unset( ANDROID_COMPILER_IS_CLANG CACHE )
	endif()

	string( REPLACE "." "" _clang_name "clang${ANDROID_CLANG_VERSION}" )
	if( NOT EXISTS "${ANDROID_CLANG_TOOLCHAIN_ROOT}/bin/${_clang_name}${TOOL_OS_SUFFIX}" )
	set( _clang_name "clang" )
	endif()


	# setup paths and STL for NDK
	if( BUILD_WITH_ANDROID_NDK )
	set( ANDROID_TOOLCHAIN_ROOT "${ANDROID_NDK_TOOLCHAINS_PATH}/${ANDROID_GCC_TOOLCHAIN_NAME}${ANDROID_NDK_TOOLCHAINS_SUBPATH}" )
	set( ANDROID_SYSROOT "${ANDROID_NDK}/platforms/android-${ANDROID_NATIVE_API_LEVEL}/arch-${ANDROID_ARCH_NAME}" )
	if( EXISTS "${ANDROID_SYSROOT}/usr/include" )
	set( ANDROID_SYSROOT_INCLUDE "${ANDROID_SYSROOT}/usr/include" )
	else()
	set( ANDROID_SYSROOT_INCLUDE "${ANDROID_NDK}/sysroot/usr/include" "${ANDROID_NDK}/sysroot/usr/include/${ANDROID_TOOLCHAIN_MACHINE_NAME}" )
	endif()

	if( ANDROID_STL STREQUAL "none" )
	# do nothing
	elseif( ANDROID_STL STREQUAL "system" )
	set( ANDROID_RTTI OFF )
	set( ANDROID_EXCEPTIONS OFF )
	set( ANDROID_STL_INCLUDE_DIRS "${ANDROID_NDK}/sources/cxx-stl/system/include" )
	elseif( ANDROID_STL STREQUAL "system_re" )
	set( ANDROID_RTTI ON )
	set( ANDROID_EXCEPTIONS ON )
	set( ANDROID_STL_INCLUDE_DIRS "${ANDROID_NDK}/sources/cxx-stl/system/include" )
	elseif( ANDROID_STL MATCHES "gabi" )
	if( ANDROID_NDK_RELEASE_NUM LESS 7000 ) # before r7
	message( FATAL_ERROR "gabi++ is not available in your NDK. You have to upgrade to NDK r7 or newer to use gabi++.")
	endif()
	set( ANDROID_RTTI ON )
	set( ANDROID_EXCEPTIONS OFF )
	set( ANDROID_STL_INCLUDE_DIRS "${ANDROID_NDK}/sources/cxx-stl/gabi++/include" )
	set( __libstl "${ANDROID_NDK}/sources/cxx-stl/gabi++/libs/${ANDROID_NDK_ABI_NAME}/libgabi++_static.a" )
	elseif( ANDROID_STL MATCHES "stlport" )
	if( NOT ANDROID_NDK_RELEASE_NUM LESS 8004 ) # before r8d
	set( ANDROID_EXCEPTIONS ON )
	else()
	set( ANDROID_EXCEPTIONS OFF )
	endif()
	if( ANDROID_NDK_RELEASE_NUM LESS 7000 ) # before r7
	set( ANDROID_RTTI OFF )
	else()
	set( ANDROID_RTTI ON )
	endif()
	set( ANDROID_STL_INCLUDE_DIRS "${ANDROID_NDK}/sources/cxx-stl/stlport/stlport" )
	set( __libstl "${ANDROID_NDK}/sources/cxx-stl/stlport/libs/${ANDROID_NDK_ABI_NAME}/libstlport_static.a" )
	elseif( ANDROID_STL MATCHES "gnustl" )
	set( ANDROID_EXCEPTIONS ON )
	set( ANDROID_RTTI ON )
	if( EXISTS "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/${ANDROID_COMPILER_VERSION}" )
	if( ARMEABI_V7A AND ANDROID_COMPILER_VERSION VERSION_EQUAL "4.7" AND ANDROID_NDK_RELEASE STREQUAL "r8d" )
	# gnustl binary for 4.7 compiler is buggy :(
	# TODO: look for right fix
	set( __libstl "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/4.6" )
	else()
	set( __libstl "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/${ANDROID_COMPILER_VERSION}" )
	endif()
	else()
	set( __libstl "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++" )
	endif()
	set( ANDROID_STL_INCLUDE_DIRS "${__libstl}/include" "${__libstl}/libs/${ANDROID_NDK_ABI_NAME}/include" "${__libstl}/include/backward" )
	if( EXISTS "${__libstl}/libs/${ANDROID_NDK_ABI_NAME}/libgnustl_static.a" )
	set( __libstl "${__libstl}/libs/${ANDROID_NDK_ABI_NAME}/libgnustl_static.a" )
	else()
	set( __libstl "${__libstl}/libs/${ANDROID_NDK_ABI_NAME}/libstdc++.a" )
	endif()
	elseif( ANDROID_STL MATCHES "c\\+\\+" )
	set( ANDROID_EXCEPTIONS ON )
	set( ANDROID_RTTI ON )
	set( __libstl "${ANDROID_NDK}/sources/cxx-stl/llvm-libc++" )
	set( __libstl "${__libstl}/libs/${ANDROID_NDK_ABI_NAME}/libc++_static.a" )
	set( ANDROID_STL_INCLUDE_DIRS "${ANDROID_NDK}/sources/android/support/include" "${ANDROID_NDK}/sources/cxx-stl/llvm-libc++/libcxx/include" "${ANDROID_NDK}/sources/cxx-stl/llvm-libc++abi/libcxxabi/include" )
	else()
	message( FATAL_ERROR "Unknown runtime: ${ANDROID_STL}" )
	endif()

	# find libsupc++.a - rtti & exceptions
	if( ANDROID_STL STREQUAL "system_re" OR ANDROID_STL MATCHES "gnustl" )
	set( __libsupcxx "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/${ANDROID_COMPILER_VERSION}/libs/${ANDROID_NDK_ABI_NAME}/libsupc++.a" ) # r8b or newer
	if( NOT EXISTS "${__libsupcxx}" )
	set( __libsupcxx "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/libs/${ANDROID_NDK_ABI_NAME}/libsupc++.a" ) # r7-r8
	endif()
	if( NOT EXISTS "${__libsupcxx}" ) # before r7
	if( ARMEABI_V7A )
	if( ANDROID_FORCE_ARM_BUILD )
	set( __libsupcxx "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}/libsupc++.a" )
	else()
	set( __libsupcxx "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}/thumb/libsupc++.a" )
	endif()
	elseif( ARMEABI AND NOT ANDROID_FORCE_ARM_BUILD )
	set( __libsupcxx "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/thumb/libsupc++.a" )
	else()
	set( __libsupcxx "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/libsupc++.a" )
	endif()
	endif()
	if( NOT EXISTS "${__libsupcxx}")
	message( ERROR "Could not find libsupc++.a for a chosen platform. Either your NDK is not supported or is broken.")
	endif()
	endif()
	endif()


	# case of shared STL linkage
	if( ANDROID_STL MATCHES "shared" AND DEFINED __libstl )
	string( REPLACE "_static.a" "_shared.so" __libstl "${__libstl}" )
	if( NOT EXISTS "${__libstl}" )
	message( FATAL_ERROR "Unable to find shared library ${__libstl}" )
	endif()
	endif()


	# ccache support
	__INIT_VARIABLE( _ndk_ccache NDK_CCACHE ENV_NDK_CCACHE )
	if( _ndk_ccache )
	if( DEFINED NDK_CCACHE AND NOT EXISTS NDK_CCACHE )
	unset( NDK_CCACHE CACHE )
	endif()
	find_program( NDK_CCACHE "${_ndk_ccache}" DOC "The path to ccache binary")
	else()
	unset( NDK_CCACHE CACHE )
	endif()
	unset( _ndk_ccache )


	# setup the cross-compiler
	if( NOT CMAKE_C_COMPILER )
	if( NDK_CCACHE AND NOT ANDROID_SYSROOT MATCHES "[ ;\"]" )
	set( CMAKE_C_COMPILER "${NDK_CCACHE}" CACHE PATH "ccache as C compiler" )
	set( CMAKE_CXX_COMPILER "${NDK_CCACHE}" CACHE PATH "ccache as C++ compiler" )
	if( ANDROID_COMPILER_IS_CLANG )
	set( CMAKE_C_COMPILER_ARG1 "${ANDROID_CLANG_TOOLCHAIN_ROOT}/bin/${_clang_name}${TOOL_OS_SUFFIX}" CACHE PATH "C compiler")
	set( CMAKE_CXX_COMPILER_ARG1 "${ANDROID_CLANG_TOOLCHAIN_ROOT}/bin/${_clang_name}++${TOOL_OS_SUFFIX}" CACHE PATH "C++ compiler")
	else()
	set( CMAKE_C_COMPILER_ARG1 "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-gcc${TOOL_OS_SUFFIX}" CACHE PATH "C compiler")
	set( CMAKE_CXX_COMPILER_ARG1 "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-g++${TOOL_OS_SUFFIX}" CACHE PATH "C++ compiler")
	endif()
	else()
	if( ANDROID_COMPILER_IS_CLANG )
	set( CMAKE_C_COMPILER "${ANDROID_CLANG_TOOLCHAIN_ROOT}/bin/${_clang_name}${TOOL_OS_SUFFIX}" CACHE PATH "C compiler")
	set( CMAKE_CXX_COMPILER "${ANDROID_CLANG_TOOLCHAIN_ROOT}/bin/${_clang_name}++${TOOL_OS_SUFFIX}" CACHE PATH "C++ compiler")
	else()
	set( CMAKE_C_COMPILER "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-gcc${TOOL_OS_SUFFIX}" CACHE PATH "C compiler" )
	set( CMAKE_CXX_COMPILER "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-g++${TOOL_OS_SUFFIX}" CACHE PATH "C++ compiler" )
	endif()
	endif()
	set( CMAKE_ASM_COMPILER "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-gcc${TOOL_OS_SUFFIX}" CACHE PATH "assembler" )
	set( CMAKE_STRIP "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-strip${TOOL_OS_SUFFIX}" CACHE PATH "strip" )
	if( EXISTS "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-gcc-ar${TOOL_OS_SUFFIX}" )
	# Use gcc-ar if we have it for better LTO support.
	set( CMAKE_AR "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-gcc-ar${TOOL_OS_SUFFIX}" CACHE PATH "archive" )
	else()
	set( CMAKE_AR "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-ar${TOOL_OS_SUFFIX}" CACHE PATH "archive" )
	endif()
	set( CMAKE_LINKER "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-ld${TOOL_OS_SUFFIX}" CACHE PATH "linker" )
	set( CMAKE_NM "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-nm${TOOL_OS_SUFFIX}" CACHE PATH "nm" )
	set( CMAKE_OBJCOPY "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-objcopy${TOOL_OS_SUFFIX}" CACHE PATH "objcopy" )
	set( CMAKE_OBJDUMP "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-objdump${TOOL_OS_SUFFIX}" CACHE PATH "objdump" )
	set( CMAKE_RANLIB "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-ranlib${TOOL_OS_SUFFIX}" CACHE PATH "ranlib" )
	endif()

	set( _CMAKE_TOOLCHAIN_PREFIX "${ANDROID_TOOLCHAIN_MACHINE_NAME}-" )
	if( CMAKE_VERSION VERSION_LESS 2.8.5 )
	set( CMAKE_ASM_COMPILER_ARG1 "-c" )
	endif()
	if( APPLE )
	find_program( CMAKE_INSTALL_NAME_TOOL NAMES install_name_tool )
	if( NOT CMAKE_INSTALL_NAME_TOOL )
	message( FATAL_ERROR "Could not find install_name_tool, please check your installation." )
	endif()
	mark_as_advanced( CMAKE_INSTALL_NAME_TOOL )
	endif()

	# Force set compilers because standard identification works badly for us
	if( CMAKE_VERSION VERSION_LESS 3.5.0 )
	include( CMakeForceCompiler )
	CMAKE_FORCE_C_COMPILER( "${CMAKE_C_COMPILER}" GNU )
	endif()
	if( ANDROID_COMPILER_IS_CLANG )
	set( CMAKE_C_COMPILER_ID Clang )
	endif()
	set( CMAKE_C_PLATFORM_ID Linux )
	if( X86_64 OR MIPS64 OR ARM64_V8A )
	set( CMAKE_C_SIZEOF_DATA_PTR 8 )
	else()
	set( CMAKE_C_SIZEOF_DATA_PTR 4 )
	endif()
	set( CMAKE_C_HAS_ISYSROOT 1 )
	set( CMAKE_C_COMPILER_ABI ELF )
	if( CMAKE_VERSION VERSION_LESS 3.5.0 )
	CMAKE_FORCE_CXX_COMPILER( "${CMAKE_CXX_COMPILER}" GNU )
	endif()
	if( ANDROID_COMPILER_IS_CLANG )
	set( CMAKE_CXX_COMPILER_ID Clang)
	endif()
	set( CMAKE_CXX_PLATFORM_ID Linux )
	set( CMAKE_CXX_SIZEOF_DATA_PTR ${CMAKE_C_SIZEOF_DATA_PTR} )
	set( CMAKE_CXX_HAS_ISYSROOT 1 )
	set( CMAKE_CXX_COMPILER_ABI ELF )
	set( CMAKE_CXX_SOURCE_FILE_EXTENSIONS cc cp cxx cpp CPP c++ C )
	# force ASM compiler (required for CMake < 2.8.5)
	set( CMAKE_ASM_COMPILER_ID_RUN TRUE )
	set( CMAKE_ASM_COMPILER_ID GNU )
	set( CMAKE_ASM_COMPILER_WORKS TRUE )
	set( CMAKE_ASM_COMPILER_FORCED TRUE )
	set( CMAKE_COMPILER_IS_GNUASM 1)
	set( CMAKE_ASM_SOURCE_FILE_EXTENSIONS s S asm )

	foreach( lang C CXX ASM )
	if( ANDROID_COMPILER_IS_CLANG )
	set( CMAKE_${lang}_COMPILER_VERSION ${ANDROID_CLANG_VERSION} )
	else()
	set( CMAKE_${lang}_COMPILER_VERSION ${ANDROID_COMPILER_VERSION} )
	endif()
	endforeach()

	# flags and definitions
	remove_definitions( -DANDROID )
	add_definitions( -DANDROID )

	if( ANDROID_SYSROOT MATCHES "[ ;\"]" )
	if( CMAKE_HOST_WIN32 )
	# try to convert path to 8.3 form
	file( WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/cvt83.cmd" "@echo %~s1" )
	execute_process( COMMAND "$ENV{ComSpec}" /c "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/cvt83.cmd" "${ANDROID_SYSROOT}"
	OUTPUT_VARIABLE __path OUTPUT_STRIP_TRAILING_WHITESPACE
	RESULT_VARIABLE __result ERROR_QUIET )
	if( __result EQUAL 0 )
	file( TO_CMAKE_PATH "${__path}" ANDROID_SYSROOT )
	set( ANDROID_CXX_FLAGS "--sysroot=${ANDROID_SYSROOT}" )
	else()
	set( ANDROID_CXX_FLAGS "--sysroot=\"${ANDROID_SYSROOT}\"" )
	endif()
	else()
	set( ANDROID_CXX_FLAGS "'--sysroot=${ANDROID_SYSROOT}'" )
	endif()
	if( NOT _CMAKE_IN_TRY_COMPILE )
	# quotes can break try_compile and compiler identification
	message(WARNING "Path to your Android NDK (or toolchain) has non-alphanumeric symbols.\nThe build might be broken.\n")
	endif()
	else()
	set( ANDROID_CXX_FLAGS "--sysroot=${ANDROID_SYSROOT}" )
	endif()

	# NDK flags
	if (ARM64_V8A )
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -funwind-tables" )
	set( ANDROID_CXX_FLAGS_RELEASE "-fomit-frame-pointer -fstrict-aliasing" )
	set( ANDROID_CXX_FLAGS_DEBUG "-fno-omit-frame-pointer -fno-strict-aliasing" )
	if( NOT ANDROID_COMPILER_IS_CLANG )
	set( ANDROID_CXX_FLAGS_RELEASE "${ANDROID_CXX_FLAGS_RELEASE} -funswitch-loops -finline-limit=300" )
	endif()
	elseif( ARMEABI OR ARMEABI_V7A OR ARMEABI_V7A_HARD)
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -funwind-tables" )
	if( NOT ANDROID_FORCE_ARM_BUILD AND NOT ARMEABI_V6 )
	set( ANDROID_CXX_FLAGS_RELEASE "-mthumb -fomit-frame-pointer -fno-strict-aliasing" )
	set( ANDROID_CXX_FLAGS_DEBUG "-marm -fno-omit-frame-pointer -fno-strict-aliasing" )
	if( NOT ANDROID_COMPILER_IS_CLANG )
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -finline-limit=64" )
	endif()
	else()
	# always compile ARMEABI_V6 in arm mode; otherwise there is no difference from ARMEABI
	set( ANDROID_CXX_FLAGS_RELEASE "-marm -fomit-frame-pointer -fstrict-aliasing" )
	set( ANDROID_CXX_FLAGS_DEBUG "-marm -fno-omit-frame-pointer -fno-strict-aliasing" )
	if( NOT ANDROID_COMPILER_IS_CLANG )
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -funswitch-loops -finline-limit=300" )
	endif()
	endif()
	elseif( X86 OR X86_64 )
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -funwind-tables" )
	if( NOT ANDROID_COMPILER_IS_CLANG )
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -funswitch-loops -finline-limit=300" )
	endif()
	set( ANDROID_CXX_FLAGS_RELEASE "-fomit-frame-pointer -fstrict-aliasing" )
	set( ANDROID_CXX_FLAGS_DEBUG "-fno-omit-frame-pointer -fno-strict-aliasing" )
	elseif( MIPS OR MIPS64 )
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -fno-strict-aliasing -finline-functions -funwind-tables -fmessage-length=0" )
	set( ANDROID_CXX_FLAGS_RELEASE "-fomit-frame-pointer" )
	set( ANDROID_CXX_FLAGS_DEBUG "-fno-omit-frame-pointer" )
	if( NOT ANDROID_COMPILER_IS_CLANG )
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -fno-inline-functions-called-once -fgcse-after-reload -frerun-cse-after-loop -frename-registers" )
	set( ANDROID_CXX_FLAGS_RELEASE "${ANDROID_CXX_FLAGS_RELEASE} -funswitch-loops -finline-limit=300" )
	endif()
	elseif()
	set( ANDROID_CXX_FLAGS_RELEASE "" )
	set( ANDROID_CXX_FLAGS_DEBUG "" )
	endif()

	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -fsigned-char" ) # good/necessary when porting desktop libraries

	if( NOT X86 AND NOT ANDROID_COMPILER_IS_CLANG )
	set( ANDROID_CXX_FLAGS "-Wno-psabi ${ANDROID_CXX_FLAGS}" )
	endif()

	if( NOT ANDROID_COMPILER_VERSION VERSION_LESS "4.6" )
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -no-canonical-prefixes" ) # see https://android-review.googlesource.com/#/c/47564/
	endif()

	# ABI-specific flags
	if( ARMEABI_V7A_HARD )
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -march=armv7-a -mfloat-abi=hard -mhard-float -D_NDK_MATH_NO_SOFTFP=1" )
	if( NEON )
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -mfpu=neon" )
	elseif( VFPV3 )
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -mfpu=vfpv3" )
	else()
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -mfpu=vfpv3-d16" )
	endif()
	elseif( ARMEABI_V7A )
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -march=armv7-a -mfloat-abi=softfp" )
	if( NEON )
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -mfpu=neon" )
	elseif( VFPV3 )
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -mfpu=vfpv3" )
	else()
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -mfpu=vfpv3-d16" )
	endif()

	elseif( ARMEABI_V6 )
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -march=armv6 -mfloat-abi=softfp -mfpu=vfp" ) # vfp == vfpv2
	elseif( ARMEABI )
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -march=armv5te -mtune=xscale -msoft-float" )
	endif()

	if( ANDROID_STL MATCHES "gnustl" AND (EXISTS "${__libstl}" OR EXISTS "${__libsupcxx}") )
	set( CMAKE_CXX_CREATE_SHARED_LIBRARY "<CMAKE_C_COMPILER> <CMAKE_SHARED_LIBRARY_CXX_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS> <CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>" )
	set( CMAKE_CXX_CREATE_SHARED_MODULE "<CMAKE_C_COMPILER> <CMAKE_SHARED_LIBRARY_CXX_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS> <CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>" )
	set( CMAKE_CXX_LINK_EXECUTABLE "<CMAKE_C_COMPILER> <FLAGS> <CMAKE_CXX_LINK_FLAGS> <LINK_FLAGS> <OBJECTS> -o <TARGET> <LINK_LIBRARIES>" )
	else()
	set( CMAKE_CXX_CREATE_SHARED_LIBRARY "<CMAKE_CXX_COMPILER> <CMAKE_SHARED_LIBRARY_CXX_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS> <CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>" )
	set( CMAKE_CXX_CREATE_SHARED_MODULE "<CMAKE_CXX_COMPILER> <CMAKE_SHARED_LIBRARY_CXX_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS> <CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>" )
	set( CMAKE_CXX_LINK_EXECUTABLE "<CMAKE_CXX_COMPILER> <FLAGS> <CMAKE_CXX_LINK_FLAGS> <LINK_FLAGS> <OBJECTS> -o <TARGET> <LINK_LIBRARIES>" )
	endif()

	# STL
	if( EXISTS "${__libstl}" OR EXISTS "${__libsupcxx}" )
	if( EXISTS "${__libstl}" )
	set( CMAKE_CXX_CREATE_SHARED_LIBRARY "${CMAKE_CXX_CREATE_SHARED_LIBRARY} \"${__libstl}\"" )
	set( CMAKE_CXX_CREATE_SHARED_MODULE "${CMAKE_CXX_CREATE_SHARED_MODULE} \"${__libstl}\"" )
	set( CMAKE_CXX_LINK_EXECUTABLE "${CMAKE_CXX_LINK_EXECUTABLE} \"${__libstl}\"" )
	endif()
	if( EXISTS "${__libsupcxx}" )
	set( CMAKE_CXX_CREATE_SHARED_LIBRARY "${CMAKE_CXX_CREATE_SHARED_LIBRARY} \"${__libsupcxx}\"" )
	set( CMAKE_CXX_CREATE_SHARED_MODULE "${CMAKE_CXX_CREATE_SHARED_MODULE} \"${__libsupcxx}\"" )
	set( CMAKE_CXX_LINK_EXECUTABLE "${CMAKE_CXX_LINK_EXECUTABLE} \"${__libsupcxx}\"" )
	# C objects:
	set( CMAKE_C_CREATE_SHARED_LIBRARY "<CMAKE_C_COMPILER> <CMAKE_SHARED_LIBRARY_C_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS> <CMAKE_SHARED_LIBRARY_SONAME_C_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>" )
	set( CMAKE_C_CREATE_SHARED_MODULE "<CMAKE_C_COMPILER> <CMAKE_SHARED_LIBRARY_C_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS> <CMAKE_SHARED_LIBRARY_SONAME_C_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>" )
	set( CMAKE_C_LINK_EXECUTABLE "<CMAKE_C_COMPILER> <FLAGS> <CMAKE_C_LINK_FLAGS> <LINK_FLAGS> <OBJECTS> -o <TARGET> <LINK_LIBRARIES>" )
	set( CMAKE_C_CREATE_SHARED_LIBRARY "${CMAKE_C_CREATE_SHARED_LIBRARY} \"${__libsupcxx}\"" )
	set( CMAKE_C_CREATE_SHARED_MODULE "${CMAKE_C_CREATE_SHARED_MODULE} \"${__libsupcxx}\"" )
	set( CMAKE_C_LINK_EXECUTABLE "${CMAKE_C_LINK_EXECUTABLE} \"${__libsupcxx}\"" )
	endif()
	if( ANDROID_STL MATCHES "gnustl" )
	if( NOT EXISTS "${ANDROID_LIBM_PATH}" )
	set( ANDROID_LIBM_PATH -lm )
	endif()
	set( CMAKE_CXX_CREATE_SHARED_LIBRARY "${CMAKE_CXX_CREATE_SHARED_LIBRARY} ${ANDROID_LIBM_PATH}" )
	set( CMAKE_CXX_CREATE_SHARED_MODULE "${CMAKE_CXX_CREATE_SHARED_MODULE} ${ANDROID_LIBM_PATH}" )
	set( CMAKE_CXX_LINK_EXECUTABLE "${CMAKE_CXX_LINK_EXECUTABLE} ${ANDROID_LIBM_PATH}" )
	endif()
	endif()

	# variables controlling optional build flags
	if( ANDROID_NDK_RELEASE_NUM LESS 7000 ) # before r7
	# libGLESv2.so in NDK's prior to r7 refers to missing external symbols.
	# So this flag option is required for all projects using OpenGL from native.
	__INIT_VARIABLE( ANDROID_SO_UNDEFINED VALUES ON )
	else()
	__INIT_VARIABLE( ANDROID_SO_UNDEFINED VALUES OFF )
	endif()
	__INIT_VARIABLE( ANDROID_NO_UNDEFINED VALUES ON )
	__INIT_VARIABLE( ANDROID_FUNCTION_LEVEL_LINKING VALUES ON )
	__INIT_VARIABLE( ANDROID_GOLD_LINKER VALUES ON )
	__INIT_VARIABLE( ANDROID_NOEXECSTACK VALUES ON )
	__INIT_VARIABLE( ANDROID_RELRO VALUES ON )

	set( ANDROID_NO_UNDEFINED ${ANDROID_NO_UNDEFINED} CACHE BOOL "Show all undefined symbols as linker errors" )
	set( ANDROID_SO_UNDEFINED ${ANDROID_SO_UNDEFINED} CACHE BOOL "Allows or disallows undefined symbols in shared libraries" )
	set( ANDROID_FUNCTION_LEVEL_LINKING ${ANDROID_FUNCTION_LEVEL_LINKING} CACHE BOOL "Put each function in separate section and enable garbage collection of unused input sections at link time" )
	set( ANDROID_GOLD_LINKER ${ANDROID_GOLD_LINKER} CACHE BOOL "Enables gold linker" )
	set( ANDROID_NOEXECSTACK ${ANDROID_NOEXECSTACK} CACHE BOOL "Allows or disallows undefined symbols in shared libraries" )
	set( ANDROID_RELRO ${ANDROID_RELRO} CACHE BOOL "Enables RELRO - a memory corruption mitigation technique" )
	mark_as_advanced( ANDROID_NO_UNDEFINED ANDROID_SO_UNDEFINED ANDROID_FUNCTION_LEVEL_LINKING ANDROID_GOLD_LINKER ANDROID_NOEXECSTACK ANDROID_RELRO )

	# linker flags
	set( ANDROID_LINKER_FLAGS "" )

	if( ARMEABI_V7A )
	# this is required to use the following linker flags that routes around
	# a CPU bug in some Cortex-A8 implementations:
	set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -Wl,--fix-cortex-a8" )
	endif()

	if( ARMEABI_V7A_HARD )
	set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -Wl,--no-warn-mismatch -lm_hard" )
	endif()

	if( ANDROID_NO_UNDEFINED )
	if( MIPS )
	# there is some sysroot-related problem in mips linker...
	if( NOT ANDROID_SYSROOT MATCHES "[ ;\"]" )
	set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -Wl,--no-undefined -Wl,-rpath-link,${ANDROID_SYSROOT}/usr/lib" )
	endif()
	else()
	set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -Wl,--no-undefined" )
	endif()
	endif()

	if( ANDROID_SO_UNDEFINED )
	set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -Wl,-allow-shlib-undefined" )
	endif()

	if( ANDROID_FUNCTION_LEVEL_LINKING )
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -fdata-sections -ffunction-sections" )
	set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -Wl,--gc-sections" )
	endif()

	if( ANDROID_COMPILER_VERSION VERSION_EQUAL "4.6" )
	if( ANDROID_GOLD_LINKER AND (CMAKE_HOST_UNIX OR ANDROID_NDK_RELEASE_NUM GREATER 8002) AND (ARMEABI OR ARMEABI_V7A OR ARMEABI_V7A_HARD OR X86) )
	set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -fuse-ld=gold" )
	elseif( ANDROID_NDK_RELEASE_NUM GREATER 8002 ) # after r8b
	set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -fuse-ld=bfd" )
	elseif( ANDROID_NDK_RELEASE STREQUAL "r8b" AND ARMEABI AND NOT _CMAKE_IN_TRY_COMPILE )
	message( WARNING "The default bfd linker from arm GCC 4.6 toolchain can fail with 'unresolvable R_ARM_THM_CALL relocation' error message. See https://code.google.com/p/android/issues/detail?id=35342
	On Linux and OS X host platform you can workaround this problem using gold linker (default).
	Rerun cmake with -DANDROID_GOLD_LINKER=ON option in case of problems.
	" )
	endif()
	endif() # version 4.6

	if( ANDROID_NOEXECSTACK )
	if( ANDROID_COMPILER_IS_CLANG )
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -Xclang -mnoexecstack" )
	else()
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -Wa,--noexecstack" )
	endif()
	set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -Wl,-z,noexecstack" )
	endif()

	if( ANDROID_RELRO )
	set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -Wl,-z,relro -Wl,-z,now" )
	endif()

	if( ANDROID_COMPILER_IS_CLANG )
	set( ANDROID_CXX_FLAGS "-target ${ANDROID_LLVM_TRIPLE} -Qunused-arguments ${ANDROID_CXX_FLAGS}" )
	if( BUILD_WITH_ANDROID_NDK )
	set( ANDROID_CXX_FLAGS "-gcc-toolchain ${ANDROID_TOOLCHAIN_ROOT} ${ANDROID_CXX_FLAGS}" )
	endif()
	endif()

	# cache flags
	set( CMAKE_CXX_FLAGS "" CACHE STRING "c++ flags" )
	set( CMAKE_C_FLAGS "" CACHE STRING "c flags" )
	set( CMAKE_CXX_FLAGS_RELEASE "-O3 -DNDEBUG" CACHE STRING "c++ Release flags" )
	set( CMAKE_C_FLAGS_RELEASE "-O3 -DNDEBUG" CACHE STRING "c Release flags" )
	set( CMAKE_CXX_FLAGS_DEBUG "-O0 -g -DDEBUG -D_DEBUG" CACHE STRING "c++ Debug flags" )
	set( CMAKE_C_FLAGS_DEBUG "-O0 -g -DDEBUG -D_DEBUG" CACHE STRING "c Debug flags" )
	set( CMAKE_SHARED_LINKER_FLAGS "" CACHE STRING "shared linker flags" )
	set( CMAKE_MODULE_LINKER_FLAGS "" CACHE STRING "module linker flags" )
	set( CMAKE_EXE_LINKER_FLAGS "-Wl,-z,nocopyreloc" CACHE STRING "executable linker flags" )

	# put flags to cache (for debug purpose only)
	set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS}" CACHE INTERNAL "Android specific c/c++ flags" )
	set( ANDROID_CXX_FLAGS_RELEASE "${ANDROID_CXX_FLAGS_RELEASE}" CACHE INTERNAL "Android specific c/c++ Release flags" )
	set( ANDROID_CXX_FLAGS_DEBUG "${ANDROID_CXX_FLAGS_DEBUG}" CACHE INTERNAL "Android specific c/c++ Debug flags" )
	set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS}" CACHE INTERNAL "Android specific c/c++ linker flags" )

	# finish flags
	set( CMAKE_CXX_FLAGS "${ANDROID_CXX_FLAGS} ${CMAKE_CXX_FLAGS}" )
	set( CMAKE_C_FLAGS "${ANDROID_CXX_FLAGS} ${CMAKE_C_FLAGS}" )
	set( CMAKE_CXX_FLAGS_RELEASE "${ANDROID_CXX_FLAGS_RELEASE} ${CMAKE_CXX_FLAGS_RELEASE}" )
	set( CMAKE_C_FLAGS_RELEASE "${ANDROID_CXX_FLAGS_RELEASE} ${CMAKE_C_FLAGS_RELEASE}" )
	set( CMAKE_CXX_FLAGS_DEBUG "${ANDROID_CXX_FLAGS_DEBUG} ${CMAKE_CXX_FLAGS_DEBUG}" )
	set( CMAKE_C_FLAGS_DEBUG "${ANDROID_CXX_FLAGS_DEBUG} ${CMAKE_C_FLAGS_DEBUG}" )
	set( CMAKE_SHARED_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} ${CMAKE_SHARED_LINKER_FLAGS}" )
	set( CMAKE_MODULE_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} ${CMAKE_MODULE_LINKER_FLAGS}" )
	set( CMAKE_EXE_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} ${CMAKE_EXE_LINKER_FLAGS}" )

	if( MIPS AND BUILD_WITH_ANDROID_NDK AND ANDROID_NDK_RELEASE STREQUAL "r8" )
	set( CMAKE_SHARED_LINKER_FLAGS "-Wl,-T,${ANDROID_NDK_TOOLCHAINS_PATH}/${ANDROID_GCC_TOOLCHAIN_NAME}/mipself.xsc ${CMAKE_SHARED_LINKER_FLAGS}" )
	set( CMAKE_MODULE_LINKER_FLAGS "-Wl,-T,${ANDROID_NDK_TOOLCHAINS_PATH}/${ANDROID_GCC_TOOLCHAIN_NAME}/mipself.xsc ${CMAKE_MODULE_LINKER_FLAGS}" )
	set( CMAKE_EXE_LINKER_FLAGS "-Wl,-T,${ANDROID_NDK_TOOLCHAINS_PATH}/${ANDROID_GCC_TOOLCHAIN_NAME}/mipself.x ${CMAKE_EXE_LINKER_FLAGS}" )
	endif()

	# pie/pic
	if( NOT (ANDROID_NATIVE_API_LEVEL LESS 16) AND (NOT DEFINED ANDROID_APP_PIE OR ANDROID_APP_PIE) AND (CMAKE_VERSION VERSION_GREATER 2.8.8) )
	set( CMAKE_POSITION_INDEPENDENT_CODE TRUE )
	set( CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fPIE -pie")
	else()
	set( CMAKE_POSITION_INDEPENDENT_CODE FALSE )
	set( CMAKE_CXX_FLAGS "-fpic ${CMAKE_CXX_FLAGS}" )
	set( CMAKE_C_FLAGS "-fpic ${CMAKE_C_FLAGS}" )
	endif()

	# configure rtti
	if( DEFINED ANDROID_RTTI AND ANDROID_STL_FORCE_FEATURES )
	if( ANDROID_RTTI )
	set( CMAKE_CXX_FLAGS "-frtti ${CMAKE_CXX_FLAGS}" )
	else()
	set( CMAKE_CXX_FLAGS "-fno-rtti ${CMAKE_CXX_FLAGS}" )
	endif()
	endif()

	# configure exceptions
	if( DEFINED ANDROID_EXCEPTIONS AND ANDROID_STL_FORCE_FEATURES )
	if( ANDROID_EXCEPTIONS )
	set( CMAKE_CXX_FLAGS "-fexceptions ${CMAKE_CXX_FLAGS}" )
	set( CMAKE_C_FLAGS "-fexceptions ${CMAKE_C_FLAGS}" )
	else()
	set( CMAKE_CXX_FLAGS "-fno-exceptions ${CMAKE_CXX_FLAGS}" )
	set( CMAKE_C_FLAGS "-fno-exceptions ${CMAKE_C_FLAGS}" )
	endif()
	endif()

	# global includes and link directories
	include_directories( SYSTEM "${ANDROID_SYSROOT_INCLUDE}" ${ANDROID_STL_INCLUDE_DIRS} )
	get_filename_component(__android_install_path "${CMAKE_INSTALL_PREFIX}/libs/${ANDROID_NDK_ABI_NAME}" ABSOLUTE) # avoid CMP0015 policy warning
	link_directories( "${__android_install_path}" )
	set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DANDROID -D__ANDROID_API__=${ANDROID_NATIVE_API_LEVEL}" )
	set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DANDROID -D__ANDROID_API__=${ANDROID_NATIVE_API_LEVEL}" )

	# detect if need link crtbegin_so.o explicitly
	if( NOT DEFINED ANDROID_EXPLICIT_CRT_LINK )
	set( __cmd "${CMAKE_CXX_CREATE_SHARED_LIBRARY}" )
	string( REPLACE "<CMAKE_CXX_COMPILER>" "${CMAKE_CXX_COMPILER} ${CMAKE_CXX_COMPILER_ARG1}" __cmd "${__cmd}" )
	string( REPLACE "<CMAKE_C_COMPILER>" "${CMAKE_C_COMPILER} ${CMAKE_C_COMPILER_ARG1}" __cmd "${__cmd}" )
	string( REPLACE "<CMAKE_SHARED_LIBRARY_CXX_FLAGS>" "${CMAKE_CXX_FLAGS}" __cmd "${__cmd}" )
	string( REPLACE "<LANGUAGE_COMPILE_FLAGS>" "" __cmd "${__cmd}" )
	string( REPLACE "<LINK_FLAGS>" "${CMAKE_SHARED_LINKER_FLAGS}" __cmd "${__cmd}" )
	string( REPLACE "<CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS>" "-shared" __cmd "${__cmd}" )
	string( REPLACE "<CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG>" "" __cmd "${__cmd}" )
	string( REPLACE "<TARGET_SONAME>" "" __cmd "${__cmd}" )
	string( REPLACE "<TARGET>" "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/toolchain_crtlink_test.so" __cmd "${__cmd}" )
	string( REPLACE "<OBJECTS>" "\"${ANDROID_SYSROOT}/usr/lib/crtbegin_so.o\"" __cmd "${__cmd}" )
	string( REPLACE "<LINK_LIBRARIES>" "" __cmd "${__cmd}" )
	separate_arguments( __cmd )
	foreach( __var ANDROID_NDK ANDROID_NDK_TOOLCHAINS_PATH ANDROID_STANDALONE_TOOLCHAIN )
	if( ${__var} )
	set( __tmp "${${__var}}" )
	separate_arguments( __tmp )
	string( REPLACE "${__tmp}" "${${__var}}" __cmd "${__cmd}")
	endif()
	endforeach()
	string( REPLACE "'" "" __cmd "${__cmd}" )
	string( REPLACE "\"" "" __cmd "${__cmd}" )
	execute_process( COMMAND ${__cmd} RESULT_VARIABLE __cmd_result OUTPUT_QUIET ERROR_QUIET )
	if( __cmd_result EQUAL 0 )
	set( ANDROID_EXPLICIT_CRT_LINK ON )
	else()
	set( ANDROID_EXPLICIT_CRT_LINK OFF )
	endif()
	endif()

	if( ANDROID_EXPLICIT_CRT_LINK )
	set( CMAKE_CXX_CREATE_SHARED_LIBRARY "${CMAKE_CXX_CREATE_SHARED_LIBRARY} \"${ANDROID_SYSROOT}/usr/lib/crtbegin_so.o\"" )
	set( CMAKE_CXX_CREATE_SHARED_MODULE "${CMAKE_CXX_CREATE_SHARED_MODULE} \"${ANDROID_SYSROOT}/usr/lib/crtbegin_so.o\"" )
	endif()

	# setup output directories
	set( CMAKE_INSTALL_PREFIX "${ANDROID_TOOLCHAIN_ROOT}/user" CACHE STRING "path for installing" )

	if( DEFINED LIBRARY_OUTPUT_PATH_ROOT
	OR EXISTS "${CMAKE_SOURCE_DIR}/AndroidManifest.xml"
	OR (EXISTS "${CMAKE_SOURCE_DIR}/../AndroidManifest.xml" AND EXISTS "${CMAKE_SOURCE_DIR}/../jni/") )
	set( LIBRARY_OUTPUT_PATH_ROOT ${CMAKE_SOURCE_DIR} CACHE PATH "Root for binaries output, set this to change where Android libs are installed to" )
	if( NOT _CMAKE_IN_TRY_COMPILE )
	if( EXISTS "${CMAKE_SOURCE_DIR}/jni/CMakeLists.txt" )
	set( EXECUTABLE_OUTPUT_PATH "${LIBRARY_OUTPUT_PATH_ROOT}/bin/${ANDROID_NDK_ABI_NAME}" CACHE PATH "Output directory for applications" )
	else()
	set( EXECUTABLE_OUTPUT_PATH "${LIBRARY_OUTPUT_PATH_ROOT}/bin" CACHE PATH "Output directory for applications" )
	endif()
	set( LIBRARY_OUTPUT_PATH "${LIBRARY_OUTPUT_PATH_ROOT}/libs/${ANDROID_NDK_ABI_NAME}" CACHE PATH "Output directory for Android libs" )
	endif()
	endif()

	# copy shaed stl library to build directory
	if( NOT _CMAKE_IN_TRY_COMPILE AND __libstl MATCHES "[.]so$" AND DEFINED LIBRARY_OUTPUT_PATH )
	get_filename_component( __libstlname "${__libstl}" NAME )
	execute_process( COMMAND "${CMAKE_COMMAND}" -E copy_if_different "${__libstl}" "${LIBRARY_OUTPUT_PATH}/${__libstlname}" RESULT_VARIABLE __fileCopyProcess )
	if( NOT __fileCopyProcess EQUAL 0 OR NOT EXISTS "${LIBRARY_OUTPUT_PATH}/${__libstlname}")
	message( SEND_ERROR "Failed copying of ${__libstl} to the ${LIBRARY_OUTPUT_PATH}/${__libstlname}" )
	endif()
	unset( __fileCopyProcess )
	unset( __libstlname )
	endif()


	# set these global flags for cmake client scripts to change behavior
	set( ANDROID True )
	set( BUILD_ANDROID True )

	# where is the target environment
	set( CMAKE_FIND_ROOT_PATH
	"${ANDROID_TOOLCHAIN_ROOT}/bin"
	"${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}"
	"${ANDROID_SYSROOT}"
	"${ANDROID_NDK}/sysroot" # NDK16+
	"${CMAKE_INSTALL_PREFIX}"
	"${CMAKE_INSTALL_PREFIX}/share" )

	# only search for libraries and includes in the ndk toolchain
	if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
	set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
	endif()

	if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
	set( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
	endif()

	if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
	set( CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY )
	endif()

	if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
	set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
	endif()

	macro(__cmake_find_root_save_and_reset)
	foreach(v
	CMAKE_FIND_ROOT_PATH_MODE_LIBRARY
	CMAKE_FIND_ROOT_PATH_MODE_INCLUDE
	CMAKE_FIND_ROOT_PATH_MODE_PACKAGE
	CMAKE_FIND_ROOT_PATH_MODE_PROGRAM
	)
	set(__save_${v} ${${v}})
	set(${v} NEVER)
	endforeach()
	endmacro()

	macro(__cmake_find_root_restore)
	foreach(v
	CMAKE_FIND_ROOT_PATH_MODE_LIBRARY
	CMAKE_FIND_ROOT_PATH_MODE_INCLUDE
	CMAKE_FIND_ROOT_PATH_MODE_PACKAGE
	CMAKE_FIND_ROOT_PATH_MODE_PROGRAM
	)
	set(${v} ${__save_${v}})
	unset(__save_${v})
	endforeach()
	endmacro()

	# macro to find packages on the host OS
	macro( find_host_package )
	__cmake_find_root_save_and_reset()
	if( CMAKE_HOST_WIN32 )
	SET( WIN32 1 )
	SET( UNIX )
	elseif( CMAKE_HOST_APPLE )
	SET( APPLE 1 )
	SET( UNIX )
	endif()
	find_package( ${ARGN} )
	SET( WIN32 )
	SET( APPLE )
	SET( UNIX 1 )
	__cmake_find_root_restore()
	endmacro()


	# macro to find programs on the host OS
	macro( find_host_program )
	__cmake_find_root_save_and_reset()
	if( CMAKE_HOST_WIN32 )
	SET( WIN32 1 )
	SET( UNIX )
	elseif( CMAKE_HOST_APPLE )
	SET( APPLE 1 )
	SET( UNIX )
	endif()
	find_program( ${ARGN} )
	SET( WIN32 )
	SET( APPLE )
	SET( UNIX 1 )
	__cmake_find_root_restore()
	endmacro()


	# export toolchain settings for the try_compile() command
	if( NOT _CMAKE_IN_TRY_COMPILE )
	set( __toolchain_config "")
	foreach( __var NDK_CCACHE LIBRARY_OUTPUT_PATH_ROOT ANDROID_FORBID_SYGWIN
	ANDROID_NDK_HOST_X64
	ANDROID_NDK
	ANDROID_NDK_LAYOUT
	ANDROID_STANDALONE_TOOLCHAIN
	ANDROID_TOOLCHAIN_NAME
	ANDROID_ABI
	ANDROID_NATIVE_API_LEVEL
	ANDROID_STL
	ANDROID_STL_FORCE_FEATURES
	ANDROID_FORCE_ARM_BUILD
	ANDROID_NO_UNDEFINED
	ANDROID_SO_UNDEFINED
	ANDROID_FUNCTION_LEVEL_LINKING
	ANDROID_GOLD_LINKER
	ANDROID_NOEXECSTACK
	ANDROID_RELRO
	ANDROID_LIBM_PATH
	ANDROID_EXPLICIT_CRT_LINK
	ANDROID_APP_PIE
	)
	if( DEFINED ${__var} )
	if( ${__var} MATCHES " ")
	set( __toolchain_config "${__toolchain_config}set( ${__var} \"${${__var}}\" CACHE INTERNAL \"\" )\n" )
	else()
	set( __toolchain_config "${__toolchain_config}set( ${__var} ${${__var}} CACHE INTERNAL \"\" )\n" )
	endif()
	endif()
	endforeach()
	file( WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/android.toolchain.config.cmake" "${__toolchain_config}" )
	unset( __toolchain_config )
	endif()


	# force cmake to produce / instead of \ in build commands for Ninja generator
	if( CMAKE_GENERATOR MATCHES "Ninja" AND CMAKE_HOST_WIN32 )
	# it is a bad hack after all
	# CMake generates Ninja makefiles with UNIX paths only if it thinks that we are going to build with MinGW
	set( CMAKE_COMPILER_IS_MINGW TRUE ) # tell CMake that we are MinGW
	set( CMAKE_CROSSCOMPILING TRUE ) # stop recursion
	enable_language( C )
	enable_language( CXX )
	# unset( CMAKE_COMPILER_IS_MINGW ) # can't unset because CMake does not convert back-slashes in response files without it
	unset( MINGW )
	endif()


	# Variables controlling behavior or set by cmake toolchain:
	# ANDROID_ABI : "armeabi-v7a" (default), "armeabi", "armeabi-v7a with NEON", "armeabi-v7a-hard with NEON", "armeabi-v7a with VFPV3", "armeabi-v6 with VFP", "x86", "mips", "arm64-v8a", "x86_64", "mips64"
	# ANDROID_NATIVE_API_LEVEL : 3,4,5,8,9,14,15,16,17,18,19,21 (depends on NDK version)
	# ANDROID_STL : gnustl_static/gnustl_shared/stlport_static/stlport_shared/gabi++_static/gabi++_shared/system_re/system/none
	# ANDROID_FORBID_SYGWIN : ON/OFF
	# ANDROID_NO_UNDEFINED : ON/OFF
	# ANDROID_SO_UNDEFINED : OFF/ON (default depends on NDK version)
	# ANDROID_FUNCTION_LEVEL_LINKING : ON/OFF
	# ANDROID_GOLD_LINKER : ON/OFF
	# ANDROID_NOEXECSTACK : ON/OFF
	# ANDROID_RELRO : ON/OFF
	# ANDROID_FORCE_ARM_BUILD : ON/OFF
	# ANDROID_STL_FORCE_FEATURES : ON/OFF
	# ANDROID_LIBM_PATH : path to libm.so (set to something like $(TOP)/out/target/product/<product_name>/obj/lib/libm.so) to workaround unresolved `sincos`
	# Can be set only at the first run:
	# ANDROID_NDK : path to your NDK install
	# NDK_CCACHE : path to your ccache executable
	# ANDROID_TOOLCHAIN_NAME : the NDK name of compiler toolchain
	# ANDROID_NDK_HOST_X64 : try to use x86_64 toolchain (default for x64 host systems)
	# ANDROID_NDK_LAYOUT : the inner NDK structure (RELEASE, LINARO, ANDROID)
	# LIBRARY_OUTPUT_PATH_ROOT : <any valid path>
	# ANDROID_STANDALONE_TOOLCHAIN
	#
	# Primary read-only variables:
	# ANDROID : always TRUE
	# ARMEABI : TRUE for arm v6 and older devices
	# ARMEABI_V6 : TRUE for arm v6
	# ARMEABI_V7A : TRUE for arm v7a
	# ARMEABI_V7A_HARD : TRUE for arm v7a with hardfp
	# ARM64_V8A : TRUE for arm64-v8a
	# NEON : TRUE if NEON unit is enabled
	# VFPV3 : TRUE if VFP version 3 is enabled
	# X86 : TRUE if configured for x86
	# X86_64 : TRUE if configured for x86_64
	# MIPS : TRUE if configured for mips
	# MIPS64 : TRUE if configured for mips64
	# BUILD_WITH_ANDROID_NDK : TRUE if NDK is used
	# BUILD_WITH_STANDALONE_TOOLCHAIN : TRUE if standalone toolchain is used
	# ANDROID_NDK_HOST_SYSTEM_NAME : "windows", "linux-x86" or "darwin-x86" depending on host platform
	# ANDROID_NDK_ABI_NAME : "armeabi", "armeabi-v7a", "armeabi-v7a-hard", "x86", "mips", "arm64-v8a", "x86_64", "mips64" depending on ANDROID_ABI
	# ANDROID_NDK_RELEASE : from r5 to r10d; set only for NDK
	# ANDROID_NDK_RELEASE_NUM : numeric ANDROID_NDK_RELEASE version (1000*major+minor)
	# ANDROID_ARCH_NAME : "arm", "x86", "mips", "arm64", "x86_64", "mips64" depending on ANDROID_ABI
	# ANDROID_SYSROOT : path to the compiler sysroot
	# ANDROID_SYSROOT_INCLUDE : paths to system include paths
	# TOOL_OS_SUFFIX : "" or ".exe" depending on host platform
	# ANDROID_COMPILER_IS_CLANG : TRUE if clang compiler is used
	#
	# Secondary (less stable) read-only variables:
	# ANDROID_COMPILER_VERSION : GCC version used (not Clang version)
	# ANDROID_CLANG_VERSION : version of clang compiler if clang is used
	# ANDROID_CXX_FLAGS : C/C++ compiler flags required by Android platform
	# ANDROID_SUPPORTED_ABIS : list of currently allowed values for ANDROID_ABI
	# ANDROID_TOOLCHAIN_MACHINE_NAME : "arm-linux-androideabi", "arm-eabi" or "i686-android-linux"
	# ANDROID_TOOLCHAIN_ROOT : path to the top level of toolchain (standalone or placed inside NDK)
	# ANDROID_CLANG_TOOLCHAIN_ROOT : path to clang tools
	# ANDROID_SUPPORTED_NATIVE_API_LEVELS : list of native API levels found inside NDK
	# ANDROID_STL_INCLUDE_DIRS : stl include paths
	# ANDROID_RTTI : if rtti is enabled by the runtime
	# ANDROID_EXCEPTIONS : if exceptions are enabled by the runtime
	# ANDROID_GCC_TOOLCHAIN_NAME : read-only, differs from ANDROID_TOOLCHAIN_NAME only if clang is used
	#
	# Defaults:
	# ANDROID_DEFAULT_NDK_API_LEVEL
	# ANDROID_DEFAULT_NDK_API_LEVEL_${ARCH}
	# ANDROID_NDK_SEARCH_PATHS
	# ANDROID_SUPPORTED_ABIS_${ARCH}
	# ANDROID_SUPPORTED_NDK_VERSIONS