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 # 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 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.
 #
 #    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 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 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 8 )
 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 )
     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()
   string( REGEX REPLACE "${__ndkApiLevelRegex}" "\\1" ${_var} "${__apiFileContent}" )
   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 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 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()
   endif()
  endif()
 endif()
 
 # 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}" "${ANDROID_NDK_TOOLCHAINS_PATH}/*" )
   if( __availableToolchains )
    list(SORT __availableToolchainsLst) # we need clang to go after gcc
   endif()
   __LIST_FILTER( __availableToolchainsLst "^[.]" )
   __LIST_FILTER( __availableToolchainsLst "llvm" )
   __LIST_FILTER( __availableToolchainsLst "renderscript" )
   __GLOB_NDK_TOOLCHAINS( __availableToolchains __availableToolchainsLst "${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 )
 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-${ANDROID_NATIVE_API_LEVEL}' is not supported by your NDK/toolchain." )
 else()
  if( BUILD_WITH_ANDROID_NDK )
   __DETECT_NATIVE_API_LEVEL( __realApiLevel "${ANDROID_NDK}/platforms/android-${ANDROID_NATIVE_API_LEVEL}/arch-${ANDROID_ARCH_NAME}/usr/include/android/api-level.h" )
   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 "${ANDROID_STL}" MATCHES "^(none|system|system_re|gabi\\+\\+_static|gabi\\+\\+_shared|stlport_static|stlport_shared|gnustl_static|gnustl_shared)$")
   message( FATAL_ERROR "ANDROID_STL is set to invalid value \"${ANDROID_STL}\".
 The possible values are:
   none           -> Do not configure the runtime.
   system         -> Use the default minimal system C++ runtime library.
   system_re      -> Same as system but with rtti and exceptions.
   gabi++_static  -> Use the GAbi++ runtime as a static library.
   gabi++_shared  -> Use the GAbi++ runtime as a shared library.
   stlport_static -> Use the STLport runtime as a static library.
   stlport_shared -> Use the STLport runtime as a shared library.
   gnustl_static  -> (default) Use the GNU STL as a static library.
   gnustl_shared  -> Use the GNU STL as a shared library.
 " )
  endif()
 elseif( BUILD_WITH_STANDALONE_TOOLCHAIN )
  if( NOT "${ANDROID_STL}" MATCHES "^(none|gnustl_static|gnustl_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.
 " )
  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" )
 
  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 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 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 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
      ${__libsupcxx}
    " )
   endif()
   if( ANDROID_STL STREQUAL "gnustl_shared" )
    if( ARMEABI_V7A AND EXISTS "${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( 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 awailable 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()
  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}" )
  # TODO: check if .so file exists before the renaming
 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" )
  set( CMAKE_AR           "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-ar${TOOL_OS_SUFFIX}"      CACHE PATH "archive" )
  set( CMAKE_LINKER       "${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()
 
 set( CMAKE_C_COMPILER_ID GNU )
 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 )
 set( CMAKE_CXX_COMPILER_ID GNU )
 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)
  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 )
  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( 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 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 exceptios
 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}/usr/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}" )
 
 # 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}" "${CMAKE_INSTALL_PREFIX}" "${CMAKE_INSTALL_PREFIX}/share" )
 
 # only search for libraries and includes in the ndk toolchain
 set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY )
 set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
 set( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
 
 
 # macro to find packages on the host OS
 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 )
  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 )
  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()
 
 
 # macro to find programs on the host OS
 macro( find_host_program )
  set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
  set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY NEVER )
  set( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE NEVER )
  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 )
  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()
 
 
 # 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 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
 #   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", "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
 #   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