编译android版本的opencv 2.4.2

想编译android版本的opencv 2.4.2，首先想到的是按照官方教材去做：

http://code.opencv.org/projects/opencv/wiki/Building_OpenCV4Android_from_trunk

在mac os x lion下，按照这个教材，笔者进行了以下操作

1、下载opencv 2.4.2源码包

http://sourceforge.net/projects/opencvlibrary/files/opencv-unix/2.4.2/OpenCV-2.4.2.tar.bz2/download

2、安装mac版本的cmake http://www.cmake.org/

3、下载mac版本的Android NDK

http://developer.android.com/sdk/ndk/index.html

然后我把安装包解压到了：

/Users/koupoo/Application/android-ndk-r8b

4、

因为之前已将安装过Android SDK，所以就不用另外下载Android SDK；

另外，mac os x lion中默认已经装有jdk 6、Apache Ant、Python，所以这些工具也不需要另外安装。

5、打开terminal命令窗口，执行命令

export ANDROID_NDK=/Users/koupoo/Application/android-ndk-r8b

6、接着执行以下命令

cd opencv/android                      sh ./scripts/cmake_android.sh

注:opencv是opencv的根目录

7、cmake_android.sh命令执行完毕后，会在build目录下生成编译opencv时需要用的各种辅助文件（makefile等）

接着执行命令

make -j4

-j4表明系统的cpu有4个核

但完全按照这些步骤去做，却发现存在这样的问题:

头文件iostream找不到..

于是检查了./scripts/cmake_android.sh文件中的内容，它的内容如下:

#!/bin/sh
cd `dirname $0`/..

mkdir -p build
cd build

cmake -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON -DCMAKE_TOOLCHAIN_FILE=../android.toolchain.cmake $@ ../..

可见

此脚本只是建立了build目录，然后进入build目录，接着在执行一个cmake命令。

-D选项用于配置cmake中的变量

可以预见的是../android.toolchain.cmake这个文件里包含了需要执行的内容

于是用文本编辑器打开../android.toolchain.cmake，查看它的内容。经查看，果然，该文件包含了生成编译opencv时需要用的各种辅助文件（makefile等）。

而且此文件头部还有它的使用说明：

....

原来它是NDK的工具脚本，那么它怎么跟NDK交互呢？

在步骤5中，我们定义了一个环境变量ANDROID_NDK=/Users/koupoo/Application/android-ndk-r8b，这个变量就是脚本android.toolchain.cmake需要使用的。

而且脚本android.toolchain.cmake中还用到了其他的变量：

# 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_USE_GNUSTL : 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 :
# Can be set only at the first run:
# ANDROID_NDK
# ANDROID_STANDALONE_TOOLCHAIN
# 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# ANDROID_API_LEVEL : superseded by ANDROID_NATIVE_API_LEVEL
# ARM_TARGET : superseded by ANDROID_ABI
# ARM_TARGETS : superseded by ANDROID_ABI (can be set only)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_NAME : "standalone", "arm-linux-androideabi-4.4.3" or "x86-4.4.3" or something similar.
# 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

如果你熟悉NDK的话，就应该清楚此脚本正是通过这些变量与NDK进行打交道。

在编译opencv时，iostream这个头文件找不到，经google，发现NDK的g++默认不支持stl（其实NDK的官方文档由此详细说明）,要自己特别说明需要使用stl功能。

检查脚本变量，可以看出只要把ANDROID_USE_STLPORT设为ON，就应该支持stl。

于是接着下面命令(当前目录为build目录)：

cmake -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON -DANDROID_USE_STLPORT=ON -DCMAKE_TOOLCHAIN_FILE=../android.toolchain.cmake $@ ../..

然后重新编译:make -j4

现在iostream这个头文件找到了，但是却发现找不到exception类，c++的try catch语句也不支持。

查看NDK的官方文档，发现ndk中有两种类型的stdc++库：

gnu-libstdc++

stlport

而使用-DANDROID_USE_STLPORT=ON，就是说明要使用stlport，如果改为gnu-libstdc++，问题会不会解决呢？

最后修改了android.toolchain.cmake这个脚本，增加变量ANDROID_USE_GNUSTL用于控制需要使用gnu-libstdc++:

...

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/${ANDROID_NDK_ABI_NAME}" )
else( ANDROID_USE_GNUSTL )
set( __stlIncludePath "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/4.4.3/include" )
set( __stlLibPath "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/4.4.3/libs/${ANDROID_NDK_ABI_NAME}" )
endif()
endif()

...

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

...

if( ANDROID_USE_STLPORT )
if( EXISTS "${__stlLibPath}/libstlport_static.a" )
__COPY_IF_DIFFERENT( "${__stlLibPath}/libstlport_static.a" "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/libstlport_static.a" )
endif()
if( EXISTS "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/libstlport_static.a" )
set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -Wl,--start-group -lstlport_static" )
endif()
else( ANDROID_USE_GNUSTL )
if( EXISTS "${__stlLibPath}/libgnustl_static.a" )
__COPY_IF_DIFFERENT( "${__stlLibPath}/libgnustl_static.a" "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/libstdc++.a" )
elseif( ANDROID_ARCH_NAME STREQUAL "arm" AND EXISTS "${__stlLibPath}/${CMAKE_SYSTEM_PROCESSOR}/thumb/libstdc++.a" )
__COPY_IF_DIFFERENT( "${__stlLibPath}/${CMAKE_SYSTEM_PROCESSOR}/thumb/libstdc++.a" "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/libstdc++.a" )
elseif( ANDROID_ARCH_NAME STREQUAL "arm" AND EXISTS "${__stlLibPath}/${CMAKE_SYSTEM_PROCESSOR}/libstdc++.a" )
__COPY_IF_DIFFERENT( "${__stlLibPath}/${CMAKE_SYSTEM_PROCESSOR}/libstdc++.a" "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/libstdc++.a" )
elseif( ANDROID_ARCH_NAME STREQUAL "arm" AND EXISTS "${__stlLibPath}/thumb/libstdc++.a" )
__COPY_IF_DIFFERENT( "${__stlLibPath}/thumb/libstdc++.a" "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/libstdc++.a" )
elseif( EXISTS "${__stlLibPath}/libstdc++.a" )
__COPY_IF_DIFFERENT( "${__stlLibPath}/libstdc++.a" "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/libstdc++.a" )
endif()
if( EXISTS "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/libstdc++.a" )
set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -lstdc++" )
endif()

...

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_USE_GNUSTL ANDROID_FORBID_SYGWIN ANDROID_NDK ANDROID_STANDALONE_TOOLCHAIN ANDROID_FUNCTION_LEVEL_LINKING )
if( DEFINED ${__var} )
set( __toolchain_config "${__toolchain_config}set( ${__var} \"${${__var}}\" )\n" )
endif()
endforeach()
file( WRITE "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/android.toolchain.config.cmake" "${__toolchain_config}" )
unset( __toolchain_config )
endif()

...

# 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_USE_GNUSTL : OFF/ON - EXPERIMENTAL!!!
# ANDROID_FORBID_SYGWIN : ON/OFF
# ANDROID_NO_UNDEFINED : ON/OFF

...

做了以上修改后，再执行命令（当前目录为build目录）

cmake -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON -DANDROID_USE_GNUSTL=ON -DCMAKE_TOOLCHAIN_FILE=../android.toolchain.cmake $@ ../..

因为需要使用tbb库，所以使用下面命令进行配置选中需要进行tbb库

ccmake .

最后

make -j4

编译顺利一切都正常了

总结编译android版本的opencv 2.4.2的步骤:

1、cd opencv/android

2、mkdir build

3、替换opencv/android目录下的android.toolchain.cmake（完整的替换文件在本文末尾）

4、cmake -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON -DANDROID_USE_GNUSTL=ON -DCMAKE_TOOLCHAIN_FILE=../android.toolchain.cmake $@ ../..

5、ccmake .

附

修改后的android.toolchain.cmake：

# ------------------------------------------------------------------------------
# Android CMake toolchain file, for use with the Android NDK r5-r8
# Requires cmake 2.6.3 or newer (2.8.3 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/svn/opencv/trunk/opencv/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=):
# 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 values 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 ${ANDROID_NDK}/docs/CPU-ARCH-ABIS.html for the documentation.
#
# ANDROID_NATIVE_API_LEVEL=android-8 - level of Android API compile for.
# Option is read-only when standalone toolchain used.
#
# ANDROID_FORCE_ARM_BUILD=OFF - set true to generate 32-bit ARM instructions
# instead of Thumb-1. Is not available for "x86" (inapplicable) and
# "armeabi-v6 with VFP" (forced) ABIs.
#
# ANDROID_NO_UNDEFINED=ON - set true to show all undefined symbols as linker
# errors even if they are not used.
#
# ANDROID_SO_UNDEFINED=OFF - set true to allow undefined symbols in shared
# libraries. Automatically turned on for NDK r5x and r6x due to GLESv2
# problems.
#
# LIBRARY_OUTPUT_PATH_ROOT=${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 ethan.ruble@gmail.com
# Andrey Kamaev andrey.kamaev@itseez.com
#
# 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
# ------------------------------------------------------------------------------

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 ${ANDROID_EXTRA_NDK_VERSIONS} -r8 -r7c -r7b -r7 -r6b -r6 -r5c -r5b -r5 "" )
if(NOT DEFINED ANDROID_NDK_SEARCH_PATHS)
if( CMAKE_HOST_WIN32 )
file( TO_CMAKE_PATH "$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/${ANDROID_NDK_ABI_NAME}" )
else( ANDROID_USE_GNUSTL )
set( __stlIncludePath "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/4.4.3/include" )
set( __stlLibPath "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/4.4.3/libs/${ANDROID_NDK_ABI_NAME}" )
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()

#STL 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=\"${ANDROID_SYSROOT}\"" )
# quotes will break try_compile and compiler identification
message(WARNING "Your Android system root has non-alphanumeric symbols. It can break compiler features detection and the whole build.")
else()
set( ANDROID_CXX_FLAGS "--sysroot=${ANDROID_SYSROOT}" )
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 "${_CMAKE_CXX_FLAGS} -frtti -fexceptions" )
set( _CMAKE_C_FLAGS "${_CMAKE_C_FLAGS} -fexceptions" )
else( ANDROID_USE_GNUSTL )
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
list( APPEND ANDROID_SYSTEM_LIB_DIRS "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}" "${CMAKE_INSTALL_PREFIX}/libs/${ANDROID_NDK_ABI_NAME}" )
set( ANDROID_LINKER_FLAGS "" )
#STL
if( ANDROID_USE_STLPORT )
if( EXISTS "${__stlLibPath}/libstlport_static.a" )
__COPY_IF_DIFFERENT( "${__stlLibPath}/libstlport_static.a" "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/libstlport_static.a" )
endif()
if( EXISTS "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/libstlport_static.a" )
set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -Wl,--start-group -lstlport_static" )
endif()
else( ANDROID_USE_GNUSTL )
if( EXISTS "${__stlLibPath}/libgnustl_static.a" )
__COPY_IF_DIFFERENT( "${__stlLibPath}/libgnustl_static.a" "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/libstdc++.a" )
elseif( ANDROID_ARCH_NAME STREQUAL "arm" AND EXISTS "${__stlLibPath}/${CMAKE_SYSTEM_PROCESSOR}/thumb/libstdc++.a" )
__COPY_IF_DIFFERENT( "${__stlLibPath}/${CMAKE_SYSTEM_PROCESSOR}/thumb/libstdc++.a" "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/libstdc++.a" )
elseif( ANDROID_ARCH_NAME STREQUAL "arm" AND EXISTS "${__stlLibPath}/${CMAKE_SYSTEM_PROCESSOR}/libstdc++.a" )
__COPY_IF_DIFFERENT( "${__stlLibPath}/${CMAKE_SYSTEM_PROCESSOR}/libstdc++.a" "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/libstdc++.a" )
elseif( ANDROID_ARCH_NAME STREQUAL "arm" AND EXISTS "${__stlLibPath}/thumb/libstdc++.a" )
__COPY_IF_DIFFERENT( "${__stlLibPath}/thumb/libstdc++.a" "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/libstdc++.a" )
elseif( EXISTS "${__stlLibPath}/libstdc++.a" )
__COPY_IF_DIFFERENT( "${__stlLibPath}/libstdc++.a" "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/libstdc++.a" )
endif()
if( EXISTS "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/libstdc++.a" )
set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -lstdc++" )
endif()

#gcc exception & rtti support
if( EXISTS "${__stlLibPath}/libsupc++.a" )
__COPY_IF_DIFFERENT( "${__stlLibPath}/libsupc++.a" "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/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" "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/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" "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/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" "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/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" "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/libsupc++.a" )
endif()
if( EXISTS "${CMAKE_BINARY_DIR}/systemlibs/${ANDROID_NDK_ABI_NAME}/libsupc++.a" )
set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -lsupc++" )
endif()
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_USE_GNUSTL ANDROID_FORBID_SYGWIN ANDROID_NDK ANDROID_STANDALONE_TOOLCHAIN ANDROID_FUNCTION_LEVEL_LINKING )
if( DEFINED ${__var} )
set( __toolchain_config "${__toolchain_config}set( ${__var} \"${${__var}}\" )\n" )
endif()
endforeach()
file( WRITE "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/android.toolchain.config.cmake" "${__toolchain_config}" )
unset( __toolchain_config )
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_USE_GNUSTL : 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 :
# Can be set only at the first run:
# ANDROID_NDK
# ANDROID_STANDALONE_TOOLCHAIN
# 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_NAME : "standalone", "arm-linux-androideabi-4.4.3" or "x86-4.4.3" or something similar.
# 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

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