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Yubyf/android_toolchain.cmake

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Created January 10, 2020 00:47
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  1. @nddrylliog nddrylliog created this gist Feb 13, 2013.
    1,127 changes: 1,127 additions & 0 deletions android_toolchain.cmake
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,1127 @@
    # ------------------------------------------------------------------------------
    # Android CMake toolchain file, for use with the Android NDK r5-r8
    # Requires cmake 2.6.3 or newer (2.8.5 or newer is recommended).
    # See home page: http://code.google.com/p/android-cmake/
    #
    # The file is mantained by the OpenCV project. And also can be found at
    # http://code.opencv.org/projects/opencv/repository/revisions/master/changes/android/android.toolchain.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 Linux (using standalone toolchain):
    # $ export ANDROID_STANDALONE_TOOLCHAIN=/absolute/path/to/android-toolchain
    # $ 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 (or 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" ..
    # $ "%ANDROID_NDK%\prebuilt\windows\bin\make.exe"
    #
    #
    # 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_STANDALONE_TOOLCHAIN=/opt/android-toolchain - path to the
    # standalone toolchain. This option is not used if full NDK is found
    # (ignored if ANDROID_NDK is set).
    # 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" - matches to the NDK ABI with the same name.
    # See ${ANDROID_NDK}/docs/CPU-ARCH-ABIS.html for the documentation.
    # "armeabi-v7a" - matches to the NDK ABI with the same name.
    # See ${ANDROID_NDK}/docs/CPU-ARCH-ABIS.html for the documentation.
    # "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" - matches to the NDK ABI with the same name.
    # See ${ANDROID_NDK}/docs/CPU-ARCH-ABIS.html for the documentation.
    # "mips" - matches to the NDK ABI with the same name
    # (not testes on real devices)
    #
    # ANDROID_NATIVE_API_LEVEL=android-8 - level of Android API compile for.
    # Option is read-only when standalone toolchain used.
    #
    # ANDROID_FORCE_ARM_BUILD=OFF - set true to generate 32-bit ARM instructions
    # instead of Thumb-1. Is not available for "x86" (inapplicable) and
    # "armeabi-v6 with VFP" (forced) ABIs.
    #
    # ANDROID_NO_UNDEFINED=ON - set true to show all undefined symbols as linker
    # errors even if they are not used.
    #
    # ANDROID_SO_UNDEFINED=OFF - set true to allow undefined symbols in shared
    # libraries. Automatically turned on for NDK r5x and r6x due to GLESv2
    # problems.
    #
    # LIBRARY_OUTPUT_PATH_ROOT=${CMAKE_SOURCE_DIR} - where to output binary
    # files. See additional details below.
    #
    # ANDROID_SET_OBSOLETE_VARIABLES=ON - it set, then toolchain defines some
    # obsolete variables which were set by previous versions of this file for
    # backward compatibility.
    #
    #
    # 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 will be set true, mutually exclusive.
    # NEON option will be set true if VFP is set to NEON.
    #
    # LIBRARY_OUTPUT_PATH_ROOT should be set in cache to determine where Android
    # libraries will be installed.
    # Default is ${CMAKE_SOURCE_DIR}, and the android libs will always be
    # under the ${LIBRARY_OUTPUT_PATH_ROOT}/libs/${ANDROID_NDK_ABI_NAME}
    # (depending on the target ABI). This is convenient for Android packaging.
    #
    # Authors:
    # Ethan Rublee [email protected]
    # Andrey Kamaev [email protected]
    #
    # Change Log:
    # - initial version December 2010
    # - modified April 2011
    # [+] added possibility to build with NDK (without standalone toolchain)
    # [+] support cross-compilation on Windows (native, no cygwin support)
    # [+] added compiler option to force "char" type to be signed
    # [+] added toolchain option to compile to 32-bit ARM instructions
    # [+] added toolchain option to disable SWIG search
    # [+] added platform "armeabi-v7a with VFPV3"
    # [~] ARM_TARGETS renamed to ARM_TARGET
    # [+] EXECUTABLE_OUTPUT_PATH is set by toolchain (required on Windows)
    # [~] Fixed bug with ANDROID_API_LEVEL variable
    # [~] turn off SWIG search if it is not found first time
    # - modified May 2011
    # [~] ANDROID_LEVEL is renamed to ANDROID_API_LEVEL
    # [+] ANDROID_API_LEVEL is detected by toolchain if not specified
    # [~] added guard to prevent changing of output directories on the first
    # cmake pass
    # [~] toolchain exits with error if ARM_TARGET is not recognized
    # - modified June 2011
    # [~] default NDK path is updated for version r5c
    # [+] variable CMAKE_SYSTEM_PROCESSOR is set based on ARM_TARGET
    # [~] toolchain install directory is added to linker paths
    # [-] removed SWIG-related stuff from toolchain
    # [+] added macro find_host_package, find_host_program to search
    # packages/programs on the host system
    # [~] fixed path to STL library
    # - modified July 2011
    # [~] fixed options caching
    # [~] search for all supported NDK versions
    # [~] allowed spaces in NDK path
    # - modified September 2011
    # [~] updated for NDK r6b
    # - modified November 2011
    # [*] rewritten for NDK r7
    # [+] x86 toolchain support (experimental)
    # [+] added "armeabi-v6 with VFP" ABI for ARMv6 processors.
    # [~] improved compiler and linker flags management
    # [+] support different build flags for Release and Debug configurations
    # [~] by default compiler flags the same as used by ndk-build (but only
    # where reasonable)
    # [~] ANDROID_NDK_TOOLCHAIN_ROOT is splitted to ANDROID_STANDALONE_TOOLCHAIN
    # and ANDROID_TOOLCHAIN_ROOT
    # [~] ARM_TARGET is renamed to ANDROID_ABI
    # [~] ARMEABI_NDK_NAME is renamed to ANDROID_NDK_ABI_NAME
    # [~] ANDROID_API_LEVEL is renamed to ANDROID_NATIVE_API_LEVEL
    # - modified January 2012
    # [+] added stlport_static support (experimental)
    # [+] added special check for cygwin
    # [+] filtered out hidden files (starting with .) while globbing inside NDK
    # [+] automatically applied GLESv2 linkage fix for NDK revisions 5-6
    # [+] added ANDROID_GET_ABI_RAWNAME to get NDK ABI names by CMake flags
    # - modified February 2012
    # [+] updated for NDK r7b
    # [~] fixed cmake try_compile() command
    # [~] Fix for missing install_name_tool on OS X
    # - modified March 2012
    # [~] fixed incorrect C compiler flags
    # [~] fixed CMAKE_SYSTEM_PROCESSOR change on ANDROID_ABI change
    # [+] improved toolchain loading speed
    # [+] added assembler language support (.S)
    # [+] allowed preset search paths and extra search suffixes
    # - modified April 2012
    # [+] updated for NDK r7c
    # [~] fixed most of problems with compiler/linker flags and caching
    # [+] added option ANDROID_FUNCTION_LEVEL_LINKING
    # - modified May 2012
    # [+] updated for NDK r8
    # [+] added mips architecture support
    # - modified August 2012
    # [+] updated for NDK r8b
    # [~] all intermediate files generated by toolchain are moved into CMakeFiles
    # [~] libstdc++ and libsupc are removed from explicit link libraries
    # ------------------------------------------------------------------------------

    cmake_minimum_required( VERSION 2.6.3 )

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

    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
    set( CMAKE_SYSTEM_NAME Linux )
    # this one not so much
    set( CMAKE_SYSTEM_VERSION 1 )

    set( ANDROID_SUPPORTED_NDK_VERSIONS ${ANDROID_EXTRA_NDK_VERSIONS} -r8b -r8 -r7c -r7b -r7 -r6b -r6 -r5c -r5b -r5 "" )
    if(NOT DEFINED ANDROID_NDK_SEARCH_PATHS)
    if( CMAKE_HOST_WIN32 )
    file( TO_CMAKE_PATH "$ENV{PROGRAMFILES}" ANDROID_NDK_SEARCH_PATHS )
    set( ANDROID_NDK_SEARCH_PATHS "${ANDROID_NDK_SEARCH_PATHS}/android-ndk" "$ENV{SystemDrive}/NVPACK/android-ndk" )
    else()
    file( TO_CMAKE_PATH "$ENV{HOME}" ANDROID_NDK_SEARCH_PATHS )
    set( ANDROID_NDK_SEARCH_PATHS /opt/android-ndk "${ANDROID_NDK_SEARCH_PATHS}/NVPACK/android-ndk" )
    endif()
    endif()
    if(NOT DEFINED ANDROID_STANDALONE_TOOLCHAIN_SEARCH_PATH)
    set( ANDROID_STANDALONE_TOOLCHAIN_SEARCH_PATH /opt/android-toolchain )
    endif()

    set( ANDROID_SUPPORTED_ABIS_arm "armeabi-v7a;armeabi;armeabi-v7a with NEON;armeabi-v7a with VFPV3;armeabi-v6 with VFP" )
    set( ANDROID_SUPPORTED_ABIS_x86 "x86" )
    set( ANDROID_SUPPORTED_ABIS_mipsel "mips" )

    set( ANDROID_DEFAULT_NDK_API_LEVEL 8 )
    set( ANDROID_DEFAULT_NDK_API_LEVEL_x86 9 )
    set( ANDROID_DEFAULT_NDK_API_LEVEL_mips 9 )


    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 ${ARGN} )
    if( __var STREQUAL "VALUES" )
    set( __values 1 )
    elseif( NOT __var STREQUAL "PATH" )
    set( __obsolete 0 )
    if( __var MATCHES "^OBSOLETE_.*$" )
    string( REPLACE "OBSOLETE_" "" __var "${__var}" )
    set( __obsolete 1 )
    endif()
    if( __var MATCHES "^ENV_.*$" )
    string( REPLACE "ENV_" "" __var "${__var}" )
    set( __value "$ENV{${__var}}" )
    elseif( DEFINED ${__var} )
    set( __value "${${__var}}" )
    else()
    if( __values )
    set( __value "${__var}" )
    else()
    set( __value "" )
    endif()
    endif()
    if( NOT "${__value}" STREQUAL "" )
    if( __test_path )
    if( EXISTS "${__value}" )
    set( ${var_name} "${__value}" )
    if( __obsolete )
    message( WARNING "Using value of obsolete variable ${__var} as initial value for ${var_name}. Please note, that ${__var} can be completely removed in future versions of the toolchain." )
    endif()
    break()
    endif()
    else()
    set( ${var_name} "${__value}" )
    if( __obsolete )
    message( WARNING "Using value of obsolete variable ${__var} as initial value for ${var_name}. Please note, that ${__var} can be completely removed in future versions of the toolchain." )
    endif()
    break()
    endif()
    endif()
    endif()
    endforeach()
    unset( __value )
    unset( __values )
    unset( __obsolete )
    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 )
    file( GLOB __gccExePath "${_root}/bin/*-gcc${TOOL_OS_SUFFIX}" )
    __LIST_FILTER( __gccExePath "bin/[.].*-gcc${TOOL_OS_SUFFIX}$" )
    list( LENGTH __gccExePath __gccExePathsCount )
    if( NOT __gccExePathsCount EQUAL 1 )
    message( WARNING "Could not uniquely 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 )
    endmacro()

    macro( __COPY_IF_DIFFERENT _source _destination )
    execute_process( COMMAND "${CMAKE_COMMAND}" -E copy_if_different "${_source}" "${_destination}" RESULT_VARIABLE __fileCopyProcess )
    if( NOT __fileCopyProcess EQUAL 0 OR NOT EXISTS "${_destination}")
    message( SEND_ERROR "Failed copying of ${_source} to the ${_destination}" )
    endif()
    unset( __fileCopyProcess )
    endmacro()


    # stl version: by default gnustl_static will be used
    set( ANDROID_USE_STLPORT FALSE CACHE BOOL "Experimental: use stlport_static instead of gnustl_static")
    mark_as_advanced( ANDROID_USE_STLPORT )

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

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

    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}${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 "${ANDROID_NDK}" ABSOLUTE )
    # try to detect change
    if( CMAKE_AR )
    string( LENGTH "${ANDROID_NDK}" __length )
    string( SUBSTRING "${CMAKE_AR}" 0 ${__length} __androidNdkPreviousPath )
    if( NOT __androidNdkPreviousPath STREQUAL ANDROID_NDK )
    message( FATAL_ERROR "It is not possible to change path to the NDK on subsequent run." )
    endif()
    unset( __androidNdkPreviousPath )
    unset( __length )
    endif()
    set( ANDROID_NDK "${ANDROID_NDK}" CACHE INTERNAL "Path of the Android NDK" )
    set( BUILD_WITH_ANDROID_NDK True )
    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" )
    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 toolcahin.
    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}
    sudo ln -s ~/my-android-toolchain ${ANDROID_STANDALONE_TOOLCHAIN_SEARCH_PATH}" )
    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 i686 )
    set( __availableToolchainArchs "x86" )
    elseif( __availableToolchainMachines MATCHES arm )
    set( __availableToolchainArchs "arm" )
    elseif( __availableToolchainMachines MATCHES mipsel )
    set( __availableToolchainArchs "mipsel" )
    endif()
    if( ANDROID_COMPILER_VERSION )
    # do not run gcc every time because it is relatevely expencive
    set( __availableToolchainCompilerVersions "${ANDROID_COMPILER_VERSION}" )
    else()
    execute_process( COMMAND "${ANDROID_STANDALONE_TOOLCHAIN}/bin/${__availableToolchainMachines}-gcc${TOOL_OS_SUFFIX}" --version
    OUTPUT_VARIABLE __availableToolchainCompilerVersions OUTPUT_STRIP_TRAILING_WHITESPACE )
    string( REGEX MATCH "[0-9]+.[0-9]+.[0-9]+" __availableToolchainCompilerVersions "${__availableToolchainCompilerVersions}" )
    endif()
    endif()

    # 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 "${ANDROID_SUPPORTED_NATIVE_API_LEVELS}" )
    file( GLOB __availableToolchains RELATIVE "${ANDROID_NDK}/toolchains" "${ANDROID_NDK}/toolchains/*" )
    __LIST_FILTER( __availableToolchains "^[.]" )
    set( __availableToolchainMachines "" )
    set( __availableToolchainArchs "" )
    set( __availableToolchainCompilerVersions "" )
    foreach( __toolchain ${__availableToolchains} )
    __DETECT_TOOLCHAIN_MACHINE_NAME( __machine "${ANDROID_NDK}/toolchains/${__toolchain}/prebuilt/${ANDROID_NDK_HOST_SYSTEM_NAME}" )
    if( __machine )
    string( REGEX MATCH "[0-9]+[.][0-9]+[.]*[0-9]*$" __version "${__toolchain}" )
    string( REGEX MATCH "^[^-]+" __arch "${__toolchain}" )
    list( APPEND __availableToolchainMachines "${__machine}" )
    list( APPEND __availableToolchainArchs "${__arch}" )
    list( APPEND __availableToolchainCompilerVersions "${__version}" )
    else()
    list( REMOVE_ITEM __availableToolchains "${__toolchain}" )
    endif()
    endforeach()
    if( NOT __availableToolchains )
    message( FATAL_ERROR "Could not any working toolchain in the NDK. Probably your Android NDK is broken." )
    endif()
    endif()

    # build list of available ABIs
    if( NOT ANDROID_SUPPORTED_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()
    endif()

    # choose target ABI
    __INIT_VARIABLE( ANDROID_ABI OBSOLETE_ARM_TARGET OBSOLETE_ARM_TARGETS 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 )

    # 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 )

    # 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_ARCH_FULLNAME "x86" )
    set( CMAKE_SYSTEM_PROCESSOR "i686" )
    elseif( ANDROID_ABI STREQUAL "mips" )
    set( MIPS true )
    set( ANDROID_NDK_ABI_NAME "mips" )
    set( ANDROID_ARCH_NAME "mips" )
    set( ANDROID_ARCH_FULLNAME "mipsel" )
    set( CMAKE_SYSTEM_PROCESSOR "mips" )
    elseif( ANDROID_ABI STREQUAL "armeabi" )
    set( ARMEABI true )
    set( ANDROID_NDK_ABI_NAME "armeabi" )
    set( ANDROID_ARCH_NAME "arm" )
    set( ANDROID_ARCH_FULLNAME "arm" )
    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_ARCH_FULLNAME "arm" )
    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_ARCH_FULLNAME "arm" )
    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_ARCH_FULLNAME "arm" )
    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_ARCH_FULLNAME "arm" )
    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()

    set( ANDROID_SUPPORTED_ABIS ${ANDROID_SUPPORTED_ABIS_${ANDROID_ARCH_FULLNAME}} CACHE INTERNAL "ANDROID_ABI can be changed only to one of these ABIs. Changing to any other ABI requires to reset cmake cache." )
    if( CMAKE_VERSION VERSION_GREATER "2.8" )
    list( SORT ANDROID_SUPPORTED_ABIS_${ANDROID_ARCH_FULLNAME} )
    set_property( CACHE ANDROID_ABI PROPERTY STRINGS ${ANDROID_SUPPORTED_ABIS_${ANDROID_ARCH_FULLNAME}} )
    endif()

    if( ANDROID_ARCH_NAME STREQUAL "arm" AND NOT ARMEABI_V6 )
    __INIT_VARIABLE( ANDROID_FORCE_ARM_BUILD OBSOLETE_FORCE_ARM 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 "${ANDROID_TOOLCHAIN_NAME}" __toolchainIdx )
    if( __toolchainIdx EQUAL -1 )
    message( FATAL_ERROR "Previously selected toolchain \"${ANDROID_TOOLCHAIN_NAME}\" is missing. You need to remove CMakeCache.txt and rerun cmake manually to change the toolchain" )
    endif()
    list( GET __availableToolchainArchs ${__toolchainIdx} __toolchainArch )
    if( NOT __toolchainArch STREQUAL ANDROID_ARCH_FULLNAME )
    message( SEND_ERROR "Previously selected toolchain \"${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_FULLNAME )
    list( GET __availableToolchainCompilerVersions ${__idx} __toolchainVersion )
    if( __toolchainVersion VERSION_GREATER __toolchainMaxVersion )
    set( __toolchainMaxVersion "${__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 ${__toolchainIdx} ANDROID_COMPILER_VERSION )
    set( ANDROID_TOOLCHAIN_NAME "${ANDROID_TOOLCHAIN_NAME}" CACHE INTERNAL "Name of toolchain used" )
    set( ANDROID_COMPILER_VERSION "${ANDROID_COMPILER_VERSION}" CACHE INTERNAL "compiler version from selected toolchain" )
    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_${ANDROID_ARCH_NAME} ANDROID_DEFAULT_NDK_API_LEVEL )
    string( REGEX MATCH "[0-9]+" ANDROID_NATIVE_API_LEVEL "${ANDROID_NATIVE_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_NATIVE_API_LEVEL}) is not supported by your NDK/toolchain." )
    endif()
    unset( __levelIdx )
    if( BUILD_WITH_ANDROID_NDK )
    __DETECT_NATIVE_API_LEVEL( __realApiLevel "${ANDROID_NDK}/platforms/android-${ANDROID_NATIVE_API_LEVEL}/arch-${ANDROID_ARCH_NAME}/usr/include/android/api-level.h" )
    if( NOT __realApiLevel EQUAL ANDROID_NATIVE_API_LEVEL )
    message( SEND_ERROR "Specified Android API level (${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 )
    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()

    # setup paths
    if( BUILD_WITH_STANDALONE_TOOLCHAIN )
    set( ANDROID_TOOLCHAIN_ROOT "${ANDROID_STANDALONE_TOOLCHAIN}" )
    set( ANDROID_SYSROOT "${ANDROID_STANDALONE_TOOLCHAIN}/sysroot" )
    set( __stlLibPath "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib" )
    endif()
    if( BUILD_WITH_ANDROID_NDK )
    set( ANDROID_TOOLCHAIN_ROOT "${ANDROID_NDK}/toolchains/${ANDROID_TOOLCHAIN_NAME}/prebuilt/${ANDROID_NDK_HOST_SYSTEM_NAME}" )
    set( ANDROID_SYSROOT "${ANDROID_NDK}/platforms/android-${ANDROID_NATIVE_API_LEVEL}/arch-${ANDROID_ARCH_NAME}" )
    if( ANDROID_USE_STLPORT )
    set( __stlIncludePath "${ANDROID_NDK}/sources/cxx-stl/stlport/stlport" )
    set( __stlLibPath "${ANDROID_NDK}/sources/cxx-stl/stlport/libs/${ANDROID_NDK_ABI_NAME}" )
    else()
    if( EXISTS "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/${ANDROID_COMPILER_VERSION}" )
    set( __stlIncludePath "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/${ANDROID_COMPILER_VERSION}/include" )
    set( __stlLibPath "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/${ANDROID_COMPILER_VERSION}/libs/${ANDROID_NDK_ABI_NAME}" )
    else()
    set( __stlIncludePath "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/include" )
    set( __stlLibPath "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/libs/${ANDROID_NDK_ABI_NAME}" )
    endif()
    endif()
    endif()

    # specify the cross compiler
    set( CMAKE_C_COMPILER "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-gcc${TOOL_OS_SUFFIX}" CACHE PATH "gcc" )
    set( CMAKE_CXX_COMPILER "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-g++${TOOL_OS_SUFFIX}" CACHE PATH "g++" )
    set( CMAKE_ASM_COMPILER "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-gcc${TOOL_OS_SUFFIX}" CACHE PATH "Assembler" )
    if( CMAKE_VERSION VERSION_LESS 2.8.5 )
    set( CMAKE_ASM_COMPILER_ARG1 "-c" )
    endif()
    # there may be a way to make cmake deduce these TODO deduce the rest of the tools
    set( CMAKE_STRIP "${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" )
    set( _CMAKE_TOOLCHAIN_PREFIX "${ANDROID_TOOLCHAIN_MACHINE_NAME}-" )
    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()

    # export directories
    set( ANDROID_SYSTEM_INCLUDE_DIRS "" )
    set( ANDROID_SYSTEM_LIB_DIRS "" )

    # setup output directories
    set( LIBRARY_OUTPUT_PATH_ROOT ${CMAKE_SOURCE_DIR} CACHE PATH "root for library output, set this to change where android libs are installed to" )
    set( CMAKE_INSTALL_PREFIX "${ANDROID_TOOLCHAIN_ROOT}/user" CACHE STRING "path for installing" )

    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 "path for android libs" )
    endif()

    # includes
    list( APPEND ANDROID_SYSTEM_INCLUDE_DIRS "${ANDROID_SYSROOT}/usr/include" )
    if( __stlIncludePath AND EXISTS "${__stlIncludePath}" )
    list( APPEND ANDROID_SYSTEM_INCLUDE_DIRS "${__stlIncludePath}" )
    endif()

    # c++ bits includes
    if( __stlLibPath AND EXISTS "${__stlLibPath}/include" )
    list( APPEND ANDROID_SYSTEM_INCLUDE_DIRS "${__stlLibPath}/include" )
    endif()
    if( ANDROID_ARCH_NAME STREQUAL "arm" AND EXISTS "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/include/c++/${ANDROID_COMPILER_VERSION}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/${CMAKE_SYSTEM_PROCESSOR}/thumb/bits" )
    list( APPEND ANDROID_SYSTEM_INCLUDE_DIRS "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/include/c++/${ANDROID_COMPILER_VERSION}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/${CMAKE_SYSTEM_PROCESSOR}/thumb" )
    elseif( EXISTS "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/include/c++/${ANDROID_COMPILER_VERSION}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/${CMAKE_SYSTEM_PROCESSOR}/bits" )
    list( APPEND ANDROID_SYSTEM_INCLUDE_DIRS "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/include/c++/${ANDROID_COMPILER_VERSION}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/${CMAKE_SYSTEM_PROCESSOR}" )
    elseif( ANDROID_ARCH_NAME STREQUAL "arm" AND EXISTS "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/include/c++/${ANDROID_COMPILER_VERSION}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/thumb/bits" )
    list( APPEND ANDROID_SYSTEM_INCLUDE_DIRS "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/include/c++/${ANDROID_COMPILER_VERSION}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/thumb" )
    elseif( EXISTS "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/include/c++/${ANDROID_COMPILER_VERSION}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/bits" )
    list( APPEND ANDROID_SYSTEM_INCLUDE_DIRS "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/include/c++/${ANDROID_COMPILER_VERSION}/${ANDROID_TOOLCHAIN_MACHINE_NAME}" )
    endif()

    # flags and definitions
    if(ANDROID_SYSROOT MATCHES "[ ;\"]")
    set( ANDROID_CXX_FLAGS "--sysroot=\"${ANDROID_SYSROOT}\"" )
    set( ANDROID_C_FLAGS "--sysroot=\"${ANDROID_SYSROOT}\"" )
    # quotes will break try_compile and compiler identification
    message(WARNING "Your Android system root has non-alphanumeric symbols. It can break compiler features detection and the whole build.")
    else()
    set( ANDROID_CXX_FLAGS "--sysroot=${ANDROID_SYSROOT}" )
    set( ANDROID_C_FLAGS "--sysroot=${ANDROID_SYSROOT}" )
    endif()

    remove_definitions( -DANDROID )
    add_definitions( -DANDROID )

    # Force set compilers because standard identification works badly for us
    include( CMakeForceCompiler )
    CMAKE_FORCE_C_COMPILER( "${CMAKE_C_COMPILER}" GNU )
    set( CMAKE_C_PLATFORM_ID Linux )
    set( CMAKE_C_SIZEOF_DATA_PTR 4 )
    set( CMAKE_C_HAS_ISYSROOT 1 )
    set( CMAKE_C_COMPILER_ABI ELF )
    CMAKE_FORCE_CXX_COMPILER( "${CMAKE_CXX_COMPILER}" GNU )
    set( CMAKE_CXX_PLATFORM_ID Linux )
    set( CMAKE_CXX_SIZEOF_DATA_PTR 4 )
    set( CMAKE_CXX_HAS_ISYSROOT 1 )
    set( CMAKE_CXX_COMPILER_ABI ELF )
    # 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)

    # NDK flags
    if( ARMEABI OR ARMEABI_V7A )
    # NDK also defines -ffunction-sections -funwind-tables but they result in worse OpenCV performance
    set( _CMAKE_CXX_FLAGS "-fPIC -Wno-psabi" )
    set( _CMAKE_C_FLAGS "-fPIC -Wno-psabi" )
    remove_definitions( -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ )
    add_definitions( -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ )
    # extra arm-specific flags
    set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -fsigned-char" )
    elseif( X86 )
    set( _CMAKE_CXX_FLAGS "-funwind-tables" )
    set( _CMAKE_C_FLAGS "-funwind-tables" )
    elseif( MIPS )
    set( _CMAKE_CXX_FLAGS "-fpic -Wno-psabi -fno-strict-aliasing -finline-functions -ffunction-sections -funwind-tables -fmessage-length=0 -fno-inline-functions-called-once -fgcse-after-reload -frerun-cse-after-loop -frename-registers" )
    set( _CMAKE_CXX_FLAGS "-fpic -Wno-psabi -fno-strict-aliasing -finline-functions -ffunction-sections -funwind-tables -fmessage-length=0 -fno-inline-functions-called-once -fgcse-after-reload -frerun-cse-after-loop -frename-registers" )
    set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -fsigned-char" )
    else()
    set( _CMAKE_CXX_FLAGS "" )
    set( _CMAKE_C_FLAGS "" )
    endif()

    if( ANDROID_USE_STLPORT )
    set( _CMAKE_CXX_FLAGS "${_CMAKE_CXX_FLAGS} -fno-rtti -fno-exceptions" )
    set( _CMAKE_C_FLAGS "${_CMAKE_C_FLAGS} -fno-exceptions" )
    else()
    set( _CMAKE_CXX_FLAGS "${_CMAKE_CXX_FLAGS} -frtti -fexceptions" )
    set( _CMAKE_C_FLAGS "${_CMAKE_C_FLAGS} -fexceptions" )
    endif()

    # release and debug flags
    if( ARMEABI OR ARMEABI_V7A )
    if( NOT ANDROID_FORCE_ARM_BUILD AND NOT ARMEABI_V6 )
    # It is recommended to use the -mthumb compiler flag to force the generation
    # of 16-bit Thumb-1 instructions (the default being 32-bit ARM ones).
    # O3 instead of O2/Os in release mode - like cmake sets for desktop gcc
    set( _CMAKE_CXX_FLAGS_RELEASE "-mthumb -O3" )
    set( _CMAKE_C_FLAGS_RELEASE "-mthumb -O3" )
    set( _CMAKE_CXX_FLAGS_DEBUG "-marm -Os -finline-limit=64" )
    set( _CMAKE_C_FLAGS_DEBUG "-marm -Os -finline-limit=64" )
    else()
    # always compile ARMEABI_V6 in arm mode; otherwise there is no difference from ARMEABI
    # O3 instead of O2/Os in release mode - like cmake sets for desktop gcc
    set( _CMAKE_CXX_FLAGS_RELEASE "-marm -O3 -fstrict-aliasing" )
    set( _CMAKE_C_FLAGS_RELEASE "-marm -O3 -fstrict-aliasing" )
    set( _CMAKE_CXX_FLAGS_DEBUG "-marm -O0 -finline-limit=300" )
    set( _CMAKE_C_FLAGS_DEBUG "-marm -O0 -finline-limit=300" )
    endif()
    elseif( X86 )
    set( _CMAKE_CXX_FLAGS_RELEASE "-O3 -fstrict-aliasing" )
    set( _CMAKE_C_FLAGS_RELEASE "-O3 -fstrict-aliasing" )
    set( _CMAKE_CXX_FLAGS_DEBUG "-O0 -finline-limit=300" )
    set( _CMAKE_C_FLAGS_DEBUG "-O0 -finline-limit=300" )
    elseif( MIPS )
    set( _CMAKE_CXX_FLAGS_RELEASE "-O3 -funswitch-loops -finline-limit=300" )
    set( _CMAKE_C_FLAGS_RELEASE "-O3 -funswitch-loops -finline-limit=300" )
    set( _CMAKE_CXX_FLAGS_DEBUG "-O0 -g" )
    set( _CMAKE_C_FLAGS_DEBUG "-O0 -g" )
    endif()
    set( _CMAKE_CXX_FLAGS_RELEASE "${_CMAKE_CXX_FLAGS_RELEASE} -fomit-frame-pointer -DNDEBUG" )
    set( _CMAKE_C_FLAGS_RELEASE "${_CMAKE_C_FLAGS_RELEASE} -fomit-frame-pointer -DNDEBUG" )
    set( _CMAKE_CXX_FLAGS_DEBUG "${_CMAKE_CXX_FLAGS_DEBUG} -fno-strict-aliasing -fno-omit-frame-pointer -DDEBUG -D_DEBUG" )
    set( _CMAKE_C_FLAGS_DEBUG "${_CMAKE_C_FLAGS_DEBUG} -fno-strict-aliasing -fno-omit-frame-pointer -DDEBUG -D_DEBUG" )

    # 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=vfp" )
    endif()
    elseif( ARMEABI_V6 )
    set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -march=armv6 -mfloat-abi=softfp -mfpu=vfp" )
    elseif( ARMEABI )
    set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -march=armv5te -mtune=xscale -msoft-float" )
    elseif( X86 )
    set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS}" )#sse?
    endif()

    # linker flags
    if( NOT DEFINED __ndklibspath )
    set( __ndklibspath "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/ndklibs/${ANDROID_NDK_ABI_NAME}" )
    endif()
    list( APPEND ANDROID_SYSTEM_LIB_DIRS "${CMAKE_INSTALL_PREFIX}/libs/${ANDROID_NDK_ABI_NAME}" )
    set( ANDROID_LINKER_FLAGS "" )

    # STL
    if( ANDROID_USE_STLPORT )
    if( EXISTS "${__stlLibPath}/libstlport_static.a" )
    set( CMAKE_CXX_CREATE_SHARED_LIBRARY "<CMAKE_CXX_COMPILER> <CMAKE_SHARED_LIBRARY_CXX_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS> <SONAME_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES> \"${__stlLibPath}/libstlport_static.a\"")
    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> <SONAME_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES> \"${__stlLibPath}/libstlport_static.a\"")
    endif()
    else( ANDROID_USE_STLPORT )
    if( EXISTS "${__stlLibPath}/libgnustl_static.a" )
    __COPY_IF_DIFFERENT( "${__stlLibPath}/libgnustl_static.a" "${__ndklibspath}/libstdc++.a" )
    elseif( ANDROID_ARCH_NAME STREQUAL "arm" AND EXISTS "${__stlLibPath}/${CMAKE_SYSTEM_PROCESSOR}/thumb/libstdc++.a" )
    __COPY_IF_DIFFERENT( "${__stlLibPath}/${CMAKE_SYSTEM_PROCESSOR}/thumb/libstdc++.a" "${__ndklibspath}/libstdc++.a" )
    elseif( ANDROID_ARCH_NAME STREQUAL "arm" AND EXISTS "${__stlLibPath}/${CMAKE_SYSTEM_PROCESSOR}/libstdc++.a" )
    __COPY_IF_DIFFERENT( "${__stlLibPath}/${CMAKE_SYSTEM_PROCESSOR}/libstdc++.a" "${__ndklibspath}/libstdc++.a" )
    elseif( ANDROID_ARCH_NAME STREQUAL "arm" AND EXISTS "${__stlLibPath}/thumb/libstdc++.a" )
    __COPY_IF_DIFFERENT( "${__stlLibPath}/thumb/libstdc++.a" "${__ndklibspath}/libstdc++.a" )
    elseif( EXISTS "${__stlLibPath}/libstdc++.a" )
    __COPY_IF_DIFFERENT( "${__stlLibPath}/libstdc++.a" "${__ndklibspath}/libstdc++.a" )
    endif()
    if( EXISTS "${__stlLibPath}/libsupc++.a" )
    __COPY_IF_DIFFERENT( "${__stlLibPath}/libsupc++.a" "${__ndklibspath}/libsupc++.a" )
    elseif( ANDROID_ARCH_NAME STREQUAL "arm" AND EXISTS "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}/thumb/libsupc++.a" )
    __COPY_IF_DIFFERENT( "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}/thumb/libsupc++.a" "${__ndklibspath}/libsupc++.a" )
    elseif( ANDROID_ARCH_NAME STREQUAL "arm" AND EXISTS "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}/libsupc++.a" )
    __COPY_IF_DIFFERENT( "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}/libsupc++.a" "${__ndklibspath}/libsupc++.a" )
    elseif( ANDROID_ARCH_NAME STREQUAL "arm" AND EXISTS "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/thumb/libsupc++.a" )
    __COPY_IF_DIFFERENT( "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/thumb/libsupc++.a" "${__ndklibspath}/libsupc++.a" )
    elseif( EXISTS "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/libsupc++.a" )
    __COPY_IF_DIFFERENT( "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/libsupc++.a" "${__ndklibspath}/libsupc++.a" )
    endif()
    list( APPEND ANDROID_SYSTEM_LIB_DIRS "${__ndklibspath}" )
    endif( ANDROID_USE_STLPORT )

    # cleanup for STL search
    unset( __stlIncludePath )
    unset( __stlLibPath )

    # other linker flags
    __INIT_VARIABLE( ANDROID_NO_UNDEFINED OBSOLETE_NO_UNDEFINED VALUES ON )
    set( ANDROID_NO_UNDEFINED ${ANDROID_NO_UNDEFINED} CACHE BOOL "Show all undefined symbols as linker errors" FORCE )
    mark_as_advanced( ANDROID_NO_UNDEFINED )
    if( ANDROID_NO_UNDEFINED )
    set( ANDROID_LINKER_FLAGS "-Wl,--no-undefined ${ANDROID_LINKER_FLAGS}" )
    endif()

    if (ANDROID_NDK MATCHES "-r[56].?$")
    # libGLESv2.so in NDK's prior to r7 refers to exteranal 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()

    set( ANDROID_SO_UNDEFINED ${ANDROID_SO_UNDEFINED} CACHE BOOL "Allows or disallows undefined symbols in shared libraries" FORCE )
    mark_as_advanced( ANDROID_SO_UNDEFINED )
    if( ANDROID_SO_UNDEFINED )
    set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -Wl,-allow-shlib-undefined" )
    endif()

    __INIT_VARIABLE( ANDROID_FUNCTION_LEVEL_LINKING VALUES ON )
    set( ANDROID_FUNCTION_LEVEL_LINKING ON CACHE BOOL "Allows or disallows undefined symbols in shared libraries" FORCE )
    mark_as_advanced( ANDROID_FUNCTION_LEVEL_LINKING )
    if( ANDROID_FUNCTION_LEVEL_LINKING )
    set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -fdata-sections -ffunction-sections" )
    set( ANDROID_LINKER_FLAGS "-Wl,--gc-sections ${ANDROID_LINKER_FLAGS}" )
    endif()

    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 "-Wl,--fix-cortex-a8 ${ANDROID_LINKER_FLAGS}" )
    endif()

    # cache flags
    set( CMAKE_CXX_FLAGS "${_CMAKE_CXX_FLAGS}" CACHE STRING "c++ flags" )
    set( CMAKE_C_FLAGS "${_CMAKE_C_FLAGS}" CACHE STRING "c flags" )
    set( CMAKE_CXX_FLAGS_RELEASE "${_CMAKE_CXX_FLAGS_RELEASE}" CACHE STRING "c++ Release flags" )
    set( CMAKE_C_FLAGS_RELEASE "${_CMAKE_C_FLAGS_RELEASE}" CACHE STRING "c Release flags" )
    set( CMAKE_CXX_FLAGS_DEBUG "${_CMAKE_CXX_FLAGS_DEBUG}" CACHE STRING "c++ Debug flags" )
    set( CMAKE_C_FLAGS_DEBUG "${_CMAKE_C_FLAGS_DEBUG}" CACHE STRING "c Debug flags" )
    set( CMAKE_SHARED_LINKER_FLAGS "" CACHE STRING "linker flags" )
    set( CMAKE_MODULE_LINKER_FLAGS "" CACHE STRING "linker flags" )
    set( CMAKE_EXE_LINKER_FLAGS "-Wl,-z,nocopyreloc" CACHE STRING "linker flags" )

    include_directories( SYSTEM ${ANDROID_SYSTEM_INCLUDE_DIRS} )
    link_directories( ${ANDROID_SYSTEM_LIB_DIRS} )

    # finish flags
    set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS}" CACHE INTERNAL "Extra Android compiler flags")
    set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS}" CACHE INTERNAL "Extra Android linker flags")
    set( CMAKE_CXX_FLAGS "${ANDROID_CXX_FLAGS} ${CMAKE_CXX_FLAGS}" )
    set( CMAKE_C_FLAGS "${ANDROID_CXX_FLAGS} ${CMAKE_C_FLAGS}" )
    if( MIPS AND BUILD_WITH_ANDROID_NDK )
    set( CMAKE_SHARED_LINKER_FLAGS "-Wl,-T,${ANDROID_NDK}/toolchains/${ANDROID_TOOLCHAIN_NAME}/mipself.xsc ${ANDROID_LINKER_FLAGS} ${CMAKE_SHARED_LINKER_FLAGS}" )
    set( CMAKE_MODULE_LINKER_FLAGS "-Wl,-T,${ANDROID_NDK}/toolchains/${ANDROID_TOOLCHAIN_NAME}/mipself.xsc ${ANDROID_LINKER_FLAGS} ${CMAKE_MODULE_LINKER_FLAGS}" )
    set( CMAKE_EXE_LINKER_FLAGS "-Wl,-T,${ANDROID_NDK}/toolchains/${ANDROID_TOOLCHAIN_NAME}/mipself.x ${ANDROID_LINKER_FLAGS} ${CMAKE_EXE_LINKER_FLAGS}" )
    else()
    set( CMAKE_SHARED_LINKER_FLAGS "${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}" )
    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()


    macro( ANDROID_GET_ABI_RAWNAME TOOLCHAIN_FLAG VAR )
    if( "${TOOLCHAIN_FLAG}" STREQUAL "ARMEABI" )
    set( ${VAR} "armeabi" )
    elseif( "${TOOLCHAIN_FLAG}" STREQUAL "ARMEABI_V7A" )
    set( ${VAR} "armeabi-v7a" )
    elseif( "${TOOLCHAIN_FLAG}" STREQUAL "X86" )
    set( ${VAR} "x86" )
    else()
    set( ${VAR} "unknown" )
    endif()
    endmacro()


    # export toolchain settings for the try_compile() command
    if( NOT PROJECT_NAME STREQUAL "CMAKE_TRY_COMPILE" )
    set( __toolchain_config "")
    foreach( __var ANDROID_ABI ANDROID_FORCE_ARM_BUILD ANDROID_NATIVE_API_LEVEL ANDROID_NO_UNDEFINED ANDROID_SO_UNDEFINED ANDROID_SET_OBSOLETE_VARIABLES LIBRARY_OUTPUT_PATH_ROOT ANDROID_USE_STLPORT ANDROID_FORBID_SYGWIN ANDROID_NDK ANDROID_STANDALONE_TOOLCHAIN ANDROID_FUNCTION_LEVEL_LINKING __ndklibspath )
    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 )
    unset( __ndklibspath )
    endif()


    # set some obsolete variables for backward compatibility
    set( ANDROID_SET_OBSOLETE_VARIABLES ON CACHE BOOL "Define obsolete Andrid-specific cmake variables" )
    mark_as_advanced( ANDROID_SET_OBSOLETE_VARIABLES )
    if( ANDROID_SET_OBSOLETE_VARIABLES )
    set( ANDROID_API_LEVEL ${ANDROID_NATIVE_API_LEVEL} )
    set( ARM_TARGET "${ANDROID_ABI}" )
    set( ARMEABI_NDK_NAME "${ANDROID_NDK_ABI_NAME}" )
    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"
    # ANDROID_NATIVE_API_LEVEL : 3,4,5,8,9,14 (depends on NDK version)
    # ANDROID_SET_OBSOLETE_VARIABLES : ON/OFF
    # ANDROID_USE_STLPORT : OFF/ON - EXPERIMENTAL!!!
    # 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
    # Variables that takes effect only at first run:
    # ANDROID_FORCE_ARM_BUILD : ON/OFF
    # LIBRARY_OUTPUT_PATH_ROOT : <any valid path>
    # Can be set only at the first run:
    # ANDROID_NDK
    # ANDROID_STANDALONE_TOOLCHAIN
    # ANDROID_TOOLCHAIN_NAME : "arm-linux-androideabi-4.4.3" or "arm-linux-androideabi-4.6" or "mipsel-linux-android-4.4.3" or "mipsel-linux-android-4.6" or "x86-4.4.3" or "x86-4.6"
    # Obsolete:
    # ANDROID_API_LEVEL : superseded by ANDROID_NATIVE_API_LEVEL
    # ARM_TARGET : superseded by ANDROID_ABI
    # ARM_TARGETS : superseded by ANDROID_ABI (can be set only)
    # ANDROID_NDK_TOOLCHAIN_ROOT : superseded by ANDROID_STANDALONE_TOOLCHAIN (can be set only)
    # ANDROID_LEVEL : superseded by ANDROID_NATIVE_API_LEVEL (completely removed)
    #
    # 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
    # NEON : TRUE if NEON unit is enabled
    # VFPV3 : TRUE if VFP version 3 is enabled
    # X86 : TRUE if configured for x86
    # BUILD_ANDROID : always TRUE
    # 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" or "x86" depending on ANDROID_ABI
    # ANDROID_ARCH_NAME : "arm" or "x86" or "mips" depending on ANDROID_ABI
    # TOOL_OS_SUFFIX : "" or ".exe" depending on host platform
    # ANDROID_SYSROOT : path to the compiler sysroot
    # ANDROID_SYSTEM_INCLUDE_DIRS
    # ANDROID_SYSTEM_LIB_DIRS
    # Obsolete:
    # ARMEABI_NDK_NAME : superseded by ANDROID_NDK_ABI_NAME
    #
    # Secondary (less stable) read-only variables:
    # ANDROID_COMPILER_VERSION : GCC version 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_SUPPORTED_NATIVE_API_LEVELS : list of native API levels found inside NDK
    #
    # Defaults:
    # ANDROID_DEFAULT_NDK_API_LEVEL
    # ANDROID_DEFAULT_NDK_API_LEVEL_${ARCH}
    # ANDROID_NDK_SEARCH_PATHS
    # ANDROID_STANDALONE_TOOLCHAIN_SEARCH_PATH
    # ANDROID_SUPPORTED_ABIS_${ARCH}
    # ANDROID_SUPPORTED_NDK_VERSIONS