CMake toolchain file and other scripts for the Android NDK

Overview

android-cmake

CMake is great, and so is Android. This is a collection of CMake scripts that may be useful to the Android NDK community. It is based on experience from porting OpenCV library to Android: http://opencv.org/platforms/android.html

Main goal is to share these scripts so that devs that use CMake as their build system may easily compile native code for Android.

TL;DR

cmake --build .">
cmake -DCMAKE_TOOLCHAIN_FILE=android.toolchain.cmake \
      -DANDROID_NDK=
   
                           \
      -DCMAKE_BUILD_TYPE=Release                     \
      -DANDROID_ABI="armeabi-v7a with NEON"          \
      
    
     
cmake --build .

    
   

One-liner:

&& cmake --build .">
cmake -DCMAKE_TOOLCHAIN_FILE=android.toolchain.cmake -DANDROID_NDK=
   
     -DCMAKE_BUILD_TYPE=Release -DANDROID_ABI="armeabi-v7a with NEON" 
    
      && cmake --build .

    
   

android-cmake will search for your NDK install in the following order:

  1. Value of ANDROID_NDK CMake variable;
  2. Value of ANDROID_NDK environment variable;
  3. Search under paths from ANDROID_NDK_SEARCH_PATHS CMake variable;
  4. Search platform specific locations (home folder, Windows "Program Files", etc).

So if you have installed the NDK as ~/android-ndk-r10d then android-cmake will locate it automatically.

Getting started

To build a cmake-based C/C++ project for Android you need:

The android-cmake is also capable to build with NDK from AOSP or Linaro Android source tree, but you may be required to manually specify path to libm binary to link with.

Difference from traditional CMake

Folowing the ndk-build the android-cmake supports only two build targets:

  • -DCMAKE_BUILD_TYPE=Release
  • -DCMAKE_BUILD_TYPE=Debug

So don't even try other targets that can be found in CMake documentation and don't forget to explicitly specify Release or Debug because CMake builds without a build configuration by default.

Difference from ndk-build

  • Latest GCC available in NDK is used as the default compiler;
  • Release builds with -O3 instead of -Os;
  • Release builds without debug info (without -g) (because ndk-build always creates a stripped version but cmake delays this for install/strip target);
  • -fsigned-char is added to compiler flags to make char signed by default as it is on x86/x86_64;
  • GCC's stack protector is not used neither in Debug nor Release configurations;
  • No builds for multiple platforms (e.g. building for both arm and x86 require to run cmake twice with different parameters);
  • No file level Neon via .neon suffix;

The following features of ndk-build are not supported by the android-cmake yet:

  • armeabi-v7a-hard ABI
  • libc++_static/libc++_shared STL runtime

Basic options

Similarly to the NDK build system android-cmake allows to select between several compiler toolchains and target platforms. Most of the options can be set either as cmake arguments: -D = or as environment variables:

  • ANDROID_NDK - path to the Android NDK. If not set then android-cmake will search for the most recent version of supported NDK in commonly used locations;

  • ANDROID_ABI - specifies the target Application Binary Interface (ABI). This option nearly matches to the APP_ABI variable used by ndk-build tool from Android NDK. If not specified then set to armeabi-v7a. Possible target names are:

    • armeabi - ARMv5TE based CPU with software floating point operations;
    • armeabi-v7a - ARMv7 based devices with hardware FPU instructions (VFPv3_D16);
    • 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_D32 as floating-point unit;
    • armeabi-v6 with VFP - tuned for ARMv6 processors having VFP;
    • x86 - IA-32 instruction set
    • mips - MIPS32 instruction set
    • arm64-v8a - ARMv8 AArch64 instruction set - only for NDK r10 and newer
    • x86_64 - Intel64 instruction set (r1) - only for NDK r10 and newer
    • mips64 - MIPS64 instruction set (r6) - only for NDK r10 and newer
  • ANDROID_NATIVE_API_LEVEL - level of android API to build for. Can be set either to full name (example: android-8) or a numeric value (example: 17). The default API level depends on the target ABI:

    • android-8 for ARM;
    • android-9 for x86 and MIPS;
    • android-21 for 64-bit ABIs.

    Building for android-L is possible only when it is explicitly selected.

  • ANDROID_TOOLCHAIN_NAME - the name of compiler toolchain to be used. This option allows to select between different GCC and Clang versions. The list of possible values depends on the NDK version and will be printed by toolchain file if an invalid value is set. By default android-cmake selects the most recent version of GCC which can build for specified ANDROID_ABI.

    Example values are:

    • aarch64-linux-android-4.9
    • aarch64-linux-android-clang3.5
    • arm-linux-androideabi-4.8
    • arm-linux-androideabi-4.9
    • arm-linux-androideabi-clang3.5
    • mips64el-linux-android-4.9
    • mipsel-linux-android-4.8
    • x86-4.9
    • x86_64-4.9
    • etc.
  • ANDROID_STL - the name of C++ runtime to use. The default is gnustl_static.

    • none - do not configure the runtime.
    • system - use the default minimal system C++ runtime library.
      • Implies -fno-rtti -fno-exceptions.
    • system_re - use the default minimal system C++ runtime library.
      • Implies -frtti -fexceptions.
    • gabi++_static - use the GAbi++ runtime as a static library.
      • Implies -frtti -fno-exceptions.
      • Available for NDK r7 and newer.
    • gabi++_shared - use the GAbi++ runtime as a shared library.
      • Implies -frtti -fno-exceptions.
      • Available for NDK r7 and newer.
    • stlport_static - use the STLport runtime as a static library.
      • Implies -fno-rtti -fno-exceptions for NDK before r7.
      • Implies -frtti -fno-exceptions for NDK r7 and newer.
    • stlport_shared - use the STLport runtime as a shared library.
      • Implies -fno-rtti -fno-exceptions for NDK before r7.
      • Implies -frtti -fno-exceptions for NDK r7 and newer.
    • gnustl_static - use the GNU STL as a static library.
      • Implies -frtti -fexceptions.
    • gnustl_shared - use the GNU STL as a shared library.
      • Implies -frtti -fno-exceptions.
      • Available for NDK r7b and newer.
      • Silently degrades to gnustl_static if not available.
  • NDK_CCACHE - path to ccache executable. If not set then initialized from NDK_CCACHE environment variable.

Advanced android-cmake options

Normally android-cmake users are not supposed to touch these variables but they might be useful to workaround some build issues:

  • ANDROID_FORCE_ARM_BUILD = OFF - generate 32-bit ARM instructions instead of Thumb. Applicable only for arm ABIs and is forced to be ON for armeabi-v6 with VFP;
  • ANDROID_NO_UNDEFINED = ON - show all undefined symbols as linker errors;
  • ANDROID_SO_UNDEFINED = OFF - allow undefined symbols in shared libraries;
    • actually it is turned ON by default for NDK older than r7
  • ANDROID_STL_FORCE_FEATURES = ON - automatically configure rtti and exceptions support based on C++ runtime;
  • ANDROID_NDK_LAYOUT = RELEASE - inner layout of Android NDK, should be detected automatically. Possible values are:
    • RELEASE - public releases from Google;
    • LINARO - NDK from Linaro project;
    • ANDROID - NDK from AOSP.
  • ANDROID_FUNCTION_LEVEL_LINKING = ON - enables saparate putting each function and data items into separate sections and enable garbage collection of unused input sections at link time (-fdata-sections -ffunction-sections -Wl,--gc-sections);
  • ANDROID_GOLD_LINKER = ON - use gold linker with GCC 4.6 for NDK r8b and newer (only for ARM and x86);
  • ANDROID_NOEXECSTACK = ON - enables or disables stack execution protection code (-Wl,-z,noexecstack);
  • ANDROID_RELRO = ON - Enables RELRO - a memory corruption mitigation technique (-Wl,-z,relro -Wl,-z,now);
  • ANDROID_LIBM_PATH - path to libm.so (set to something like $(TOP)/out/target/product/ /obj/lib/libm.so ) to workaround unresolved sincos.

Fine-tuning CMakeLists.txt for android-cmake

Recognizing Android build

android-cmake defines ANDROID CMake variable which can be used to add Android-specific stuff:

if (ANDROID)
    message(STATUS "Hello from Android build!")
endif()

The recommended way to identify ARM/MIPS/x86 architecture is examining CMAKE_SYSTEM_PROCESSOR which is set to the appropriate value:

  • armv5te - for armeabi ABI
  • armv6 - for armeabi-v6 with VFP ABI
  • armv7-a - for armeabi-v7a, armeabi-v7a with VFPV3 and armeabi-v7a with NEON ABIs
  • aarch64 - for arm64-v8a ABI
  • i686 - for x86 ABI
  • x86_64 - for x86_64 ABI
  • mips - for mips ABI
  • mips64 - for mips64 ABI

Other variables that are set by android-cmake and can be used for the fine-grained build configuration are:

  • NEON - set if target ABI supports Neon;
  • ANDROID_NATIVE_API_LEVEL - native Android API level we are building for (note: Java part of Andoid application can be built for another API level)
  • ANDROID_NDK_RELEASE - version of the Android NDK
  • ANDROID_NDK_HOST_SYSTEM_NAME - "windows", "linux-x86" or "darwin-x86" depending on the host platform
  • ANDROID_RTTI - set if rtti is enabled by the runtime
  • ANDROID_EXCEPTIONS - set if exceptions are enabled by the runtime

Finding packages

When crosscompiling CMake find_* commands are normally expected to find libraries and packages belonging to the same build target. So android-cmake configures CMake to search in Android-specific paths only and ignore your host system locations. So

find_package(ZLIB)

will surely find libz.so within the Android NDK.

However sometimes you need to locate a host package even when cross-compiling. For example you can be searching for your documentation generator. The android-cmake recommends you to use find_host_package and find_host_program macro defined in the android.toolchain.cmake:

find_host_package(Doxygen)
find_host_program(PDFLATEX pdflatex)

However this will break regular builds so instead of wrapping package search into platform-specific logic you can copy the following snippet into your project (put it after your top-level project() command):

# Search packages for host system instead of packages for target system
# in case of cross compilation these macro should be defined by toolchain file
if(NOT COMMAND find_host_package)
  macro(find_host_package)
    find_package(${ARGN})
  endmacro()
endif()
if(NOT COMMAND find_host_program)
  macro(find_host_program)
    find_program(${ARGN})
  endmacro()
endif()

Compiler flags recycling

Make sure to do the following in your scripts:

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${my_cxx_flags}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${my_cxx_flags}")

The flags will be prepopulated with critical flags, so don't loose them. Also be aware that android-cmake also sets configuration-specific compiler and linker flags.

Troubleshooting

Building on Windows

First of all cygwin builds are NOT supported and will not be supported by android-cmake. To build natively on Windows you need a port of make but I recommend http://martine.github.io/ninja/ instead.

To build with Ninja you need:

  • Ensure you are using CMake newer than 2.8.9;
  • Download the latest Ninja from https://github.com/martine/ninja/releases;
  • Put the ninja.exe into your PATH (or add path to ninja.exe to your PATH environment variable);
  • Pass -GNinja to cmake alongside with other arguments (or choose Ninja generator in cmake-gui).
  • Enjoy the fast native multithreaded build :)

But if you still want to stick to old make then:

  • Get a Windows port of GNU Make:
  • Add path to your make.exe to system PATH or always use full path;
  • Pass -G"MinGW Makefiles" and -DCMAKE_MAKE_PROGRAM=" make.exe"
    • It must be MinGW Makefiles and not Unix Makefiles even if your make.exe is not a MinGW's make.
  • Run make.exe or cmake --build . for single-threaded build.

Projects with assembler files

The android-cmake should correctly handle projects with assembler sources (*.s or *.S). But if you still facing problems with assembler then try to upgrade your CMake to version newer than 2.8.5

Copying

android-cmake is distributed under the terms of BSD 3-Clause License

Comments
  • error: unknown target CPU 'armv7-a'

    error: unknown target CPU 'armv7-a'

    Hi,

    I have a very simple script: export ANDROID_NDK=~/android-ndk-r8e cmake -DCMAKE_TOOLCHAIN_FILE=~/android-cmake/android.toolchain.cmake

    everything works fine at this point but trying to run make I always receive the same error: error: unknown target CPU 'armv7-a'

    I have tried different toolchains using ANDROID_TOOLCHAIN_NAME, but the error is always the same.

    Any ideas what could be wrong?

    Thanks!

    opened by shaders 13
  • Search for standalone toolchain first

    Search for standalone toolchain first

    Currently, ANDROID_NDK has priority over ANDROID_STANDALONE_TOOLCHAIN. As far as I know, there are two main environment setups that NDK devs use :

    1. Regular (as untarred) toolchain
    2. Standalone toolchain for building and installing private libs into + Regular toolchain on the side out of necessity (for e.g building with Qt for Android)

    For people like me who prefer option 2, regular NDK priority over standalone is an inconvenience, due to private installed libs not being found in regular NDK paths, which would be solved by inverting this priority. This inversion does not affect people (probably the majority) who use option 1.

    opened by ayberkozgur 7
  • Add support for NDK/toolchains cloned from git

    Add support for NDK/toolchains cloned from git

    Hi,

    While trying to integrate apitrace [1], a user of android.toolchain.cmake, into FirefoxOS [2] I stumbled to the following issue:

    The directories layout in http://dl.google.com/android/ndk/android-ndk-r8-linux-x86.tar.bz2 is different than the one in git://android.git.linaro.org/platform/prebuilt and apparently android.toolchain.cmake only supports the former (or maybe I failed to provide the proper cmake options?).

    I created a simple patch for android.toolchain.cmake (as is provided in the apitrace project) [3] to recognize the directory structure from git when ANDROID_NDK is specified.

    Would be nice to have that functionality in android-cmake itself.

    [1] https://github.com/apitrace/apitrace [2] https://bugzilla.mozilla.org/show_bug.cgi?id=831147 [3] https://github.com/vasild/apitrace/commit/91e28b53dfd47c683bf41c1b66e20eb540873686

    opened by vasild 7
  • Make ANDROID a cache variable.

    Make ANDROID a cache variable.

    Some projects that use CMake and support Android have something in their CMakeLists.txt like: OPTION( ANDROID "Build for Android NDK" OFF )

    Using this toolchain file won't override the ANDROID option the first time CMake runs unless ANDROID is a cache variable.

    opened by efidler 6
  • cmake 3.6.0 not compatible with android-cmake with Ninja on Windows

    cmake 3.6.0 not compatible with android-cmake with Ninja on Windows

    Getting the following when trying to use android-cmake with cmake 3.6.0 and ninja on Windows:

    RUNNING: cmake --version
    cmake version 3.6.0
    
    CMake suite maintained and supported by Kitware (kitware.com/cmake).
    RUNNING: cmake -DCMAKE_TOOLCHAIN_FILE=cmake/android/android.toolchain.cmake -DCMAKE_BUILD_TYPE=Release -DANDROID_NATIVE_API_LEVEL=21 -DANDROID_TOOLCHAIN_NAME=arm-linux-androideabi-4.9 -DTREAT_WARNINGS_AS_ERRORS=1 -G Ninja G:\Hp3d-HR-dev
    CMake Deprecation Warning at G:/Program Files/CMake/share/cmake-3.6/Modules/CMakeForceCompiler.cmake:79 (message):
      The CMAKE_FORCE_C_COMPILER macro is deprecated.  Instead just set
      CMAKE_C_COMPILER and allow CMake to identify the compiler.
    Call Stack (most recent call first):
      cmake/android/android.toolchain.cmake:1129 (CMAKE_FORCE_C_COMPILER)
      G:/Program Files/CMake/share/cmake-3.6/Modules/CMakeDetermineSystem.cmake:98 (include)
      CMakeLists.txt:4 (PROJECT)
    
    
    CMake Deprecation Warning at G:/Program Files/CMake/share/cmake-3.6/Modules/CMakeForceCompiler.cmake:93 (message):
      The CMAKE_FORCE_CXX_COMPILER macro is deprecated.  Instead just set
      CMAKE_CXX_COMPILER and allow CMake to identify the compiler.
    Call Stack (most recent call first):
      cmake/android/android.toolchain.cmake:1141 (CMAKE_FORCE_CXX_COMPILER)
      G:/Program Files/CMake/share/cmake-3.6/Modules/CMakeDetermineSystem.cmake:98 (include)
      CMakeLists.txt:4 (PROJECT)
    
    
    CMake Error at cmake/android/android.toolchain.cmake:1622 (enable_language):
      Language 'C' is currently being enabled.  Recursive call not allowed.
    Call Stack (most recent call first):
      G:/Program Files/CMake/share/cmake-3.6/Modules/CMakeDetermineSystem.cmake:98 (include)
      CMakeLists.txt:4 (PROJECT)
    
    
    -- Configuring incomplete, errors occurred!
    Traceback (most recent call last):
      File "buildLib\build.py", line 708, in <module>
      File "buildLib\build.py", line 95, in Main
      File "buildLib\build.py", line 205, in RunCMake
      File "G:\Hp3d-HR-dev\scripts\buildLib\cmd.py", line 28, in Run
        raise(RuntimeError('ERROR (%i) running command: %s' % (ret, cmdLine)))
    RuntimeError: ERROR (1) running command: cmake -DCMAKE_TOOLCHAIN_FILE=cmake/android/android.toolchain.cmake -DCMAKE_BUILD_TYPE=Release -DANDROID_NATIVE_API_LEVEL=21 -DANDROID_TOOLCHAIN_NAME=arm-linux-androideabi-4.9 -DTREAT_WARNINGS_AS_ERRORS=1 -G Ninja G:\Hp3d-HR-dev
    
    BUILD STEP FAILED: Running CMake
    
    opened by ned14 4
  • CMake Error: CMake was unable to find a build program corresponding to

    CMake Error: CMake was unable to find a build program corresponding to "Unix Makefiles". CMAKE_MAKE_PROGRAM is not set.

    I am trying to build using android cmake. I am following this https://github.com/solrex/caffe-mobile#for-android. I am getting this error. Please help.

    
    #####################
     Building OpenBLAS for Android
    #####################
    
    mkdir: cannot create directory ‘../build_armeabi’: File exists
    CMake Deprecation Warning at /usr/share/cmake-3.10/Modules/CMakeForceCompiler.cmake:69 (message):
      The CMAKE_FORCE_C_COMPILER macro is deprecated.  Instead just set
      CMAKE_C_COMPILER and allow CMake to identify the compiler.
    Call Stack (most recent call first):
      third_party/android-cmake/android.toolchain.cmake:1146 (CMAKE_FORCE_C_COMPILER)
      /usr/share/cmake-3.10/Modules/CMakeDetermineSystem.cmake:91 (include)
      CMakeLists.txt
    
    
    CMake Deprecation Warning at /usr/share/cmake-3.10/Modules/CMakeForceCompiler.cmake:83 (message):
      The CMAKE_FORCE_CXX_COMPILER macro is deprecated.  Instead just set
      CMAKE_CXX_COMPILER and allow CMake to identify the compiler.
    Call Stack (most recent call first):
      third_party/android-cmake/android.toolchain.cmake:1158 (CMAKE_FORCE_CXX_COMPILER)
      /usr/share/cmake-3.10/Modules/CMakeDetermineSystem.cmake:91 (include)
      CMakeLists.txt
    
    
    CMake Error: CMake was unable to find a build program corresponding to "Unix Makefiles".  CMAKE_MAKE_PROGRAM is not set.  You probably need to select a different build tool.
    -- Configuring incomplete, errors occurred!
    See also "/home/sid/caffe-mobile/build_armeabi/CMakeFiles/CMakeOutput.log".
    
    
    opened by Siddhant24 3
  • *find_path* and *find_library* doesn't seem to work

    *find_path* and *find_library* doesn't seem to work

    I'm trying to use find_path and find_library to find headers and libraries for local files that I built for android. The path is correct but it doesn't find anything. Here's an example:

    set(LIBUV_ROOT_DIR "[Path to libuv local files]")
    find_path(LIBUV_INCLUDE_DIR
         NAMES uv.h
         HINTS ${LIBUV_ROOT_DIR}/include
    )
    

    LIBUV_INCLUDE_DIR-Not-Found

    do these functions work for android-toolchain ?

    opened by septag 3
  • Pass target triplet to clang compiler.

    Pass target triplet to clang compiler.

    Hey there. I found that I needed to add the target to clang arguments in order to get it working. Otherwise I would get an error: "error: unknown target CPU 'armv7-a'" when compiling for arm. I checked the output of ndk-build and it includes the target parameter. This is for llvm-3.3 on ndk r9c. I am on Mac OS X 10.9.2.

    opened by chromaticbum 3
  • Rendermanager

    Rendermanager

    Not sure how this branch ended up with a lot of Ryan's clean-up commits, but they let me build the RenderManager branch of the Android-Build project. I did need to remove one flag parameter to get SDL to build.

    I tested that the master branch of OSVR-Android-Build can still build as well using this branch as the master branch. Can someone take a look and see if this looks okay to merge?

    opened by russell-taylor 2
  • Problem building with Crystax 10.1.0 and add-rendermanager branch

    Problem building with Crystax 10.1.0 and add-rendermanager branch

    I get the following error when trying to build. It looks from the code like maybe the first element in the + operation is empty, making the overall expression be +0 rather than 0+0 or some other number +0.

    CMake Error at /home/taylorr/sensics/src/OSVR-Android-Build/android-cmake/android.toolchain.cmake:429 (math): math cannot parse the expression: "+0": syntax error, unexpected exp_PLUS, expecting exp_OPENPARENT or exp_NUMBER (1) Call Stack (most recent call first): /usr/share/cmake-3.2/Modules/CMakeDetermineSystem.cmake:98 (include) CMakeLists.txt:2 (project)

    This was not an issue with bbfa867e97c69ad41d160f2b2d4d5a1241c86620, which is what I started out using to develop a RenderManager port.

    opened by russell-taylor 2
  • How to choose explicitly the GCC version to be used (arch dependent)

    How to choose explicitly the GCC version to be used (arch dependent)

    Hi,

    I wish I can stick to NDK r10d (cf. Android NDK, Revision 10d (December 2014) changelog) defaults for GCC versions:

    Made GCC 4.8 the default for all 32-bit ABIs. Deprecated GCC 4.6, and will remove it next release. To restore previous behavior, either add NDK_TOOLCHAIN_VERSION=4.6 to ndk-build, or add --toolchain=arm-linux-androideabi-4.6 when executing make-standalone-toolchain.sh on the command line. GCC 4.9 remains the default for 64-bit ABIs.

    I didn't succeed using ANDROID_STANDALONE_TOOLCHAIN and didn't see a "version" option made available. I've also tried using NDK_TOOLCHAIN_VERSION as for ndk-build but didn't worked. I've seen that all versions of toolchains are detected in the targeted SDK.

    Thanks.

    opened by opatry 2
  • how to generate executable file

    how to generate executable file

    hi all: I meet one strange issue, I write one demo code with cpp and aarch64 asm, my cmakelists.txt is as below: cmake_minimum_required(VERSION 3.6)

    set(CMAKE_SYSTEM_NAME Android) set(CMAKE_SYSTEM_VERSION 21) # API level set(CMAKE_ANDROID_ARCH_ABI arm64-v8a) set(CMAKE_ANDROID_NDK /home/chenyuz/android-ndk) set(CMAKE_ANDROID_STL_TYPE gnustl_static)

    PROJECT(test_hello LANGUAGES C CXX ASM VERSION 0.1)

    find_package(Threads)

    INCLUDE_DIRECTORIES( inc )

    AUX_SOURCE_DIRECTORY(src Source)

    list(APPEND Source src/rsCpuIntrinsics_advsimd_Resize.S)

    add_executable(${PROJECT_NAME} ${Source})

    target_link_libraries(${PROJECT_NAME} ${CMAKE_THREAD_LIBS_INIT})

    TARGET_LINK_LIBRARIES(${PROJECT_NAME} m) TARGET_LINK_LIBRARIES(${PROJECT_NAME} log) TARGET_LINK_LIBRARIES(${PROJECT_NAME} c)

    Then I run: [email protected]:~/Youdao/Aarch64_unittest/build$ cmake -DCMAKE_TOOLCHAIN_FILE=/home/chenyuz/android-ndk/build/cmake/android.toolchain.cmake -DCMAKE_BUILD_TYPE=Release -DANDROID_ABI=arm64-v8a .. -- The ASM compiler identification is Clang -- Found assembler: /home/chenyuz/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/clang -- Check for working C compiler: /home/chenyuz/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/clang -- Check for working C compiler: /home/chenyuz/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/clang -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Detecting C compile features -- Detecting C compile features - done -- Check for working CXX compiler: /home/chenyuz/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ -- Check for working CXX compiler: /home/chenyuz/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ -- works -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Detecting CXX compile features -- Detecting CXX compile features - done -- Configuring done -- Generating done -- Build files have been written to: /home/chenyuz/Youdao/Aarch64_unittest/build [email protected]:~/Youdao/Aarch64_unittest/build$ make Scanning dependencies of target test_hello [ 50%] Building CXX object CMakeFiles/test_hello.dir/jni/test-asm.cpp.o [100%] Linking CXX executable test_hello [100%] Built target test_hello [email protected]:~/Youdao/Aarch64_unittest/build$ file test_hello test_hello: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked (uses shared libs), BuildID[sha1]=e12c6117eba88c1c844d719d6707a5ef48d233de, not stripped [email protected]:~/Youdao/Aarch64_unittest/build$

    as you see, it is generated as shared object, not executable file. I already use add_executable() function, so I am really wonderring how to generate one executable file, it already tormented some days, I really need your help!

    Thanks in advanced!

    opened by zcy618 0
  • adept to new ndk releases

    adept to new ndk releases

    The project here is really helpful however a bit out of date. ndk changed its structure so new version (later than r14) will not work. So I modify a little of the project for new ndk releases. Since I don't have the right to push. I just pasted the code here. Hope it will help.

    android.toolchain.cmake:

    # Copyright (c) 2010-2011, Ethan Rublee
    # Copyright (c) 2011-2014, Andrey Kamaev
    # All rights reserved.
    #
    # Redistribution and use in source and binary forms, with or without
    # modification, are permitted provided that the following conditions are met:
    #
    # 1.  Redistributions of source code must retain the above copyright notice,
    #     this list of conditions and the following disclaimer.
    #
    # 2.  Redistributions in binary form must reproduce the above copyright notice,
    #     this list of conditions and the following disclaimer in the documentation
    #     and/or other materials provided with the distribution.
    #
    # 3.  Neither the name of the copyright holder nor the names of its
    #     contributors may be used to endorse or promote products derived from this
    #     software without specific prior written permission.
    #
    # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
    # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    # POSSIBILITY OF SUCH DAMAGE.
    
    # ------------------------------------------------------------------------------
    #  Android CMake toolchain file, for use with the Android NDK r5-r10d
    #  Requires cmake 2.6.3 or newer (2.8.9 or newer is recommended).
    #  See home page: https://github.com/taka-no-me/android-cmake
    #
    #  Usage Linux:
    #   $ export ANDROID_NDK=/absolute/path/to/the/android-ndk
    #   $ mkdir build && cd build
    #   $ cmake -DCMAKE_TOOLCHAIN_FILE=path/to/the/android.toolchain.cmake ..
    #   $ make -j8
    #
    #  Usage Windows:
    #     You need native port of make to build your project.
    #     Android NDK r7 (and newer) already has make.exe on board.
    #     For older NDK you have to install it separately.
    #     For example, this one: http://gnuwin32.sourceforge.net/packages/make.htm
    #
    #   $ SET ANDROID_NDK=C:\absolute\path\to\the\android-ndk
    #   $ mkdir build && cd build
    #   $ cmake.exe -G"MinGW Makefiles"
    #       -DCMAKE_TOOLCHAIN_FILE=path\to\the\android.toolchain.cmake
    #       -DCMAKE_MAKE_PROGRAM="%ANDROID_NDK%\prebuilt\windows\bin\make.exe" ..
    #   $ cmake.exe --build .
    #
    #
    #  Options (can be set as cmake parameters: -D<option_name>=<value>):
    #    ANDROID_NDK=/opt/android-ndk - path to the NDK root.
    #      Can be set as environment variable. Can be set only at first cmake run.
    #
    #    ANDROID_ABI=armeabi-v7a - specifies the target Application Binary
    #      Interface (ABI). This option nearly matches to the APP_ABI variable
    #      used by ndk-build tool from Android NDK.
    #
    #      Possible targets are:
    #        "armeabi" - ARMv5TE based CPU with software floating point operations
    #        "armeabi-v7a" - ARMv7 based devices with hardware FPU instructions
    #            this ABI target is used by default
    #        "armeabi-v7a with NEON" - same as armeabi-v7a, but
    #            sets NEON as floating-point unit
    #        "armeabi-v7a with VFPV3" - same as armeabi-v7a, but
    #            sets VFPV3 as floating-point unit (has 32 registers instead of 16)
    #        "armeabi-v6 with VFP" - tuned for ARMv6 processors having VFP
    #        "x86" - IA-32 instruction set
    #        "mips" - MIPS32 instruction set
    #
    #      64-bit ABIs for NDK r10 and newer:
    #        "arm64-v8a" - ARMv8 AArch64 instruction set
    #        "x86_64" - Intel64 instruction set (r1)
    #        "mips64" - MIPS64 instruction set (r6)
    #
    #    ANDROID_NATIVE_API_LEVEL=android-8 - level of Android API compile for.
    #      Option is read-only when standalone toolchain is used.
    #      Note: building for "android-L" requires explicit configuration.
    #
    #    ANDROID_TOOLCHAIN_NAME=arm-linux-androideabi-4.9 - the name of compiler
    #      toolchain to be used. The list of possible values depends on the NDK
    #      version. For NDK r10c the possible values are:
    #
    #        * aarch64-linux-android-4.9
    #        * aarch64-linux-android-clang3.4
    #        * aarch64-linux-android-clang3.5
    #        * arm-linux-androideabi-4.6
    #        * arm-linux-androideabi-4.8
    #        * arm-linux-androideabi-4.9 (default)
    #        * arm-linux-androideabi-clang3.4
    #        * arm-linux-androideabi-clang3.5
    #        * mips64el-linux-android-4.9
    #        * mips64el-linux-android-clang3.4
    #        * mips64el-linux-android-clang3.5
    #        * mipsel-linux-android-4.6
    #        * mipsel-linux-android-4.8
    #        * mipsel-linux-android-4.9
    #        * mipsel-linux-android-clang3.4
    #        * mipsel-linux-android-clang3.5
    #        * x86-4.6
    #        * x86-4.8
    #        * x86-4.9
    #        * x86-clang3.4
    #        * x86-clang3.5
    #        * x86_64-4.9
    #        * x86_64-clang3.4
    #        * x86_64-clang3.5
    #
    #    ANDROID_FORCE_ARM_BUILD=OFF - set ON to generate 32-bit ARM instructions
    #      instead of Thumb. Is not available for "armeabi-v6 with VFP"
    #      (is forced to be ON) ABI.
    #
    #    ANDROID_NO_UNDEFINED=ON - set ON to show all undefined symbols as linker
    #      errors even if they are not used.
    #
    #    ANDROID_SO_UNDEFINED=OFF - set ON to allow undefined symbols in shared
    #      libraries. Automatically turned for NDK r5x and r6x due to GLESv2
    #      problems.
    #
    #    ANDROID_STL=gnustl_static - specify the runtime to use.
    #
    #      Possible values are:
    #        none           -> Do not configure the runtime.
    #        system         -> Use the default minimal system C++ runtime library.
    #                          Implies -fno-rtti -fno-exceptions.
    #                          Is not available for standalone toolchain.
    #        system_re      -> Use the default minimal system C++ runtime library.
    #                          Implies -frtti -fexceptions.
    #                          Is not available for standalone toolchain.
    #        gabi++_static  -> Use the GAbi++ runtime as a static library.
    #                          Implies -frtti -fno-exceptions.
    #                          Available for NDK r7 and newer.
    #                          Is not available for standalone toolchain.
    #        gabi++_shared  -> Use the GAbi++ runtime as a shared library.
    #                          Implies -frtti -fno-exceptions.
    #                          Available for NDK r7 and newer.
    #                          Is not available for standalone toolchain.
    #        stlport_static -> Use the STLport runtime as a static library.
    #                          Implies -fno-rtti -fno-exceptions for NDK before r7.
    #                          Implies -frtti -fno-exceptions for NDK r7 and newer.
    #                          Is not available for standalone toolchain.
    #        stlport_shared -> Use the STLport runtime as a shared library.
    #                          Implies -fno-rtti -fno-exceptions for NDK before r7.
    #                          Implies -frtti -fno-exceptions for NDK r7 and newer.
    #                          Is not available for standalone toolchain.
    #        gnustl_static  -> Use the GNU STL as a static library.
    #                          Implies -frtti -fexceptions.
    #        gnustl_shared  -> Use the GNU STL as a shared library.
    #                          Implies -frtti -fno-exceptions.
    #                          Available for NDK r7b and newer.
    #                          Silently degrades to gnustl_static if not available.
    #
    #    ANDROID_STL_FORCE_FEATURES=ON - turn rtti and exceptions support based on
    #      chosen runtime. If disabled, then the user is responsible for settings
    #      these options.
    #
    #  What?:
    #    android-cmake toolchain searches for NDK/toolchain in the following order:
    #      ANDROID_NDK - cmake parameter
    #      ANDROID_NDK - environment variable
    #      ANDROID_STANDALONE_TOOLCHAIN - cmake parameter
    #      ANDROID_STANDALONE_TOOLCHAIN - environment variable
    #      ANDROID_NDK - default locations
    #      ANDROID_STANDALONE_TOOLCHAIN - default locations
    #
    #    Make sure to do the following in your scripts:
    #      SET( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${my_cxx_flags}" )
    #      SET( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${my_cxx_flags}" )
    #    The flags will be prepopulated with critical flags, so don't loose them.
    #    Also be aware that toolchain also sets configuration-specific compiler
    #    flags and linker flags.
    #
    #    ANDROID and BUILD_ANDROID will be set to true, you may test any of these
    #    variables to make necessary Android-specific configuration changes.
    #
    #    Also ARMEABI or ARMEABI_V7A or X86 or MIPS or ARM64_V8A or X86_64 or MIPS64
    #    will be set true, mutually exclusive. NEON option will be set true
    #    if VFP is set to NEON.
    #
    # ------------------------------------------------------------------------------
    
    cmake_minimum_required( VERSION 2.6.3 )
    
    if( DEFINED CMAKE_CROSSCOMPILING )
     # subsequent toolchain loading is not really needed
     return()
    endif()
    
    if( CMAKE_TOOLCHAIN_FILE )
     # touch toolchain variable to suppress "unused variable" warning
    endif()
    
    # inherit settings in recursive loads
    get_property( _CMAKE_IN_TRY_COMPILE GLOBAL PROPERTY IN_TRY_COMPILE )
    if( _CMAKE_IN_TRY_COMPILE )
     include( "${CMAKE_CURRENT_SOURCE_DIR}/../android.toolchain.config.cmake" OPTIONAL )
    endif()
    
    # this one is important
    if( CMAKE_VERSION VERSION_GREATER "3.0.99" )
     set( CMAKE_SYSTEM_NAME Android )
    else()
     set( CMAKE_SYSTEM_NAME Linux )
    endif()
    
    # this one not so much
    set( CMAKE_SYSTEM_VERSION 1 )
    
    # rpath makes low sense for Android
    set( CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG "" )
    set( CMAKE_SKIP_RPATH TRUE CACHE BOOL "If set, runtime paths are not added when using shared libraries." )
    
    # NDK search paths
    set( ANDROID_SUPPORTED_NDK_VERSIONS ${ANDROID_EXTRA_NDK_VERSIONS} -r10d -r10c -r10b -r10 -r9d -r9c -r9b -r9 -r8e -r8d -r8c -r8b -r8 -r7c -r7b -r7 -r6b -r6 -r5c -r5b -r5 "" )
    if( NOT DEFINED ANDROID_NDK_SEARCH_PATHS )
     if( CMAKE_HOST_WIN32 )
      file( TO_CMAKE_PATH "$ENV{PROGRAMFILES}" ANDROID_NDK_SEARCH_PATHS )
      set( ANDROID_NDK_SEARCH_PATHS "${ANDROID_NDK_SEARCH_PATHS}" "$ENV{SystemDrive}/NVPACK" )
     else()
      file( TO_CMAKE_PATH "$ENV{HOME}" ANDROID_NDK_SEARCH_PATHS )
      set( ANDROID_NDK_SEARCH_PATHS /opt "${ANDROID_NDK_SEARCH_PATHS}/NVPACK" )
     endif()
    endif()
    if( NOT DEFINED ANDROID_STANDALONE_TOOLCHAIN_SEARCH_PATH )
     set( ANDROID_STANDALONE_TOOLCHAIN_SEARCH_PATH /opt/android-toolchain )
    endif()
    
    # known ABIs
    set( ANDROID_SUPPORTED_ABIS_arm "armeabi-v7a;armeabi;armeabi-v7a with NEON;armeabi-v7a with VFPV3;armeabi-v6 with VFP" )
    set( ANDROID_SUPPORTED_ABIS_arm64 "arm64-v8a" )
    set( ANDROID_SUPPORTED_ABIS_x86 "x86" )
    set( ANDROID_SUPPORTED_ABIS_x86_64 "x86_64" )
    set( ANDROID_SUPPORTED_ABIS_mips "mips" )
    set( ANDROID_SUPPORTED_ABIS_mips64 "mips64" )
    
    # API level defaults
    set( ANDROID_DEFAULT_NDK_API_LEVEL 8 )
    set( ANDROID_DEFAULT_NDK_API_LEVEL_arm64 21 )
    set( ANDROID_DEFAULT_NDK_API_LEVEL_x86 9 )
    set( ANDROID_DEFAULT_NDK_API_LEVEL_x86_64 21 )
    set( ANDROID_DEFAULT_NDK_API_LEVEL_mips 9 )
    set( ANDROID_DEFAULT_NDK_API_LEVEL_mips64 21 )
    
    
    macro( __LIST_FILTER listvar regex )
      if( ${listvar} )
        foreach( __val ${${listvar}} )
          if( __val MATCHES "${regex}" )
            list( REMOVE_ITEM ${listvar} "${__val}" )
          endif()
        endforeach()
      endif()
    endmacro()
    
    macro( __INIT_VARIABLE var_name )
      set( __test_path 0 )
      foreach( __var ${ARGN} )
        if( __var STREQUAL "PATH" )
          set( __test_path 1 )
          break()
        endif()
      endforeach()
    
      if( __test_path AND NOT EXISTS "${${var_name}}" )
        unset( ${var_name} CACHE )
      endif()
    
      if( " ${${var_name}}" STREQUAL " " )
        set( __values 0 )
        foreach( __var ${ARGN} )
          if( __var STREQUAL "VALUES" )
            set( __values 1 )
          elseif( NOT __var STREQUAL "PATH" )
            if( __var MATCHES "^ENV_.*$" )
              string( REPLACE "ENV_" "" __var "${__var}" )
              set( __value "$ENV{${__var}}" )
            elseif( DEFINED ${__var} )
              set( __value "${${__var}}" )
            elseif( __values )
              set( __value "${__var}" )
            else()
              set( __value "" )
            endif()
    
            if( NOT " ${__value}" STREQUAL " " AND (NOT __test_path OR EXISTS "${__value}") )
              set( ${var_name} "${__value}" )
              break()
            endif()
          endif()
        endforeach()
        unset( __value )
        unset( __values )
      endif()
    
      if( __test_path )
        file( TO_CMAKE_PATH "${${var_name}}" ${var_name} )
      endif()
      unset( __test_path )
    endmacro()
    
    macro( __DETECT_NATIVE_API_LEVEL _var _path )
      set( __ndkApiLevelRegex "^[\t ]*#define[\t ]+__ANDROID_API__[\t ]+([0-9]+)[\t ]*.*$" )
      file( STRINGS ${_path} __apiFileContent REGEX "${__ndkApiLevelRegex}" )
      if( NOT __apiFileContent )
        message( SEND_ERROR "Could not get Android native API level. Probably you have specified invalid level value, or your copy of NDK/toolchain is broken." )
      endif()
      string( REGEX REPLACE "${__ndkApiLevelRegex}" "\\1" ${_var} "${__apiFileContent}" )
      unset( __apiFileContent )
      unset( __ndkApiLevelRegex )
    endmacro()
    
    macro( __DETECT_TOOLCHAIN_MACHINE_NAME _var _root )
     if( EXISTS "${_root}" )
        file( GLOB __gccExePath RELATIVE "${_root}/bin/" "${_root}/bin/*-gcc${TOOL_OS_SUFFIX}" )
        __LIST_FILTER( __gccExePath "^[.].*" )
        list( LENGTH __gccExePath __gccExePathsCount )
        if( NOT __gccExePathsCount EQUAL 1  AND NOT _CMAKE_IN_TRY_COMPILE )
          message( WARNING "Could not determine machine name for compiler from ${_root}" )
          set( ${_var} "" )
        else()
          get_filename_component( __gccExeName "${__gccExePath}" NAME_WE )
          string( REPLACE "-gcc" "" ${_var} "${__gccExeName}" )
        endif()
        unset( __gccExePath )
        unset( __gccExePathsCount )
        unset( __gccExeName )
      else()
        set( ${_var} "" )
      endif()
    endmacro()
    
    
    # fight against cygwin
    set( ANDROID_FORBID_SYGWIN TRUE CACHE BOOL "Prevent cmake from working under cygwin and using cygwin tools")
    mark_as_advanced( ANDROID_FORBID_SYGWIN )
    if( ANDROID_FORBID_SYGWIN )
     if( CYGWIN )
      message( FATAL_ERROR "Android NDK and android-cmake toolchain are not welcome Cygwin. It is unlikely that this cmake toolchain will work under cygwin. But if you want to try then you can set cmake variable ANDROID_FORBID_SYGWIN to FALSE and rerun cmake." )
     endif()
    
     if( CMAKE_HOST_WIN32 )
      # remove cygwin from PATH
      set( __new_path "$ENV{PATH}")
      __LIST_FILTER( __new_path "cygwin" )
      set(ENV{PATH} "${__new_path}")
      unset(__new_path)
     endif()
    endif()
    
    
    # detect current host platform
    if( NOT DEFINED ANDROID_NDK_HOST_X64 AND (CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "amd64|x86_64|AMD64" OR CMAKE_HOST_APPLE) )
     set( ANDROID_NDK_HOST_X64 1 CACHE BOOL "Try to use 64-bit compiler toolchain" )
     mark_as_advanced( ANDROID_NDK_HOST_X64 )
    endif()
    
    set( TOOL_OS_SUFFIX "" )
    if( CMAKE_HOST_APPLE )
     set( ANDROID_NDK_HOST_SYSTEM_NAME "darwin-x86_64" )
     set( ANDROID_NDK_HOST_SYSTEM_NAME2 "darwin-x86" )
    elseif( CMAKE_HOST_WIN32 )
     set( ANDROID_NDK_HOST_SYSTEM_NAME "windows-x86_64" )
     set( ANDROID_NDK_HOST_SYSTEM_NAME2 "windows" )
     set( TOOL_OS_SUFFIX ".exe" )
    elseif( CMAKE_HOST_UNIX )
     set( ANDROID_NDK_HOST_SYSTEM_NAME "linux-x86_64" )
     set( ANDROID_NDK_HOST_SYSTEM_NAME2 "linux-x86" )
    else()
     message( FATAL_ERROR "Cross-compilation on your platform is not supported by this cmake toolchain" )
    endif()
    
    if( NOT ANDROID_NDK_HOST_X64 )
     set( ANDROID_NDK_HOST_SYSTEM_NAME ${ANDROID_NDK_HOST_SYSTEM_NAME2} )
    endif()
    
    # see if we have path to Android NDK
    if( NOT ANDROID_NDK AND NOT ANDROID_STANDALONE_TOOLCHAIN )
      __INIT_VARIABLE( ANDROID_NDK PATH ENV_ANDROID_NDK )
    endif()
    if( NOT ANDROID_NDK )
     # see if we have path to Android standalone toolchain
     __INIT_VARIABLE( ANDROID_STANDALONE_TOOLCHAIN PATH ENV_ANDROID_STANDALONE_TOOLCHAIN )
    
     if( NOT ANDROID_STANDALONE_TOOLCHAIN )
      #try to find Android NDK in one of the the default locations
      set( __ndkSearchPaths )
      foreach( __ndkSearchPath ${ANDROID_NDK_SEARCH_PATHS} )
       foreach( suffix ${ANDROID_SUPPORTED_NDK_VERSIONS} )
        list( APPEND __ndkSearchPaths "${__ndkSearchPath}/android-ndk${suffix}" )
       endforeach()
      endforeach()
      __INIT_VARIABLE( ANDROID_NDK PATH VALUES ${__ndkSearchPaths} )
      unset( __ndkSearchPaths )
    
      if( ANDROID_NDK )
       message( STATUS "Using default path for Android NDK: ${ANDROID_NDK}" )
       message( STATUS "  If you prefer to use a different location, please define a cmake or environment variable: ANDROID_NDK" )
      else()
       #try to find Android standalone toolchain in one of the the default locations
       __INIT_VARIABLE( ANDROID_STANDALONE_TOOLCHAIN PATH ANDROID_STANDALONE_TOOLCHAIN_SEARCH_PATH )
    
       if( ANDROID_STANDALONE_TOOLCHAIN )
        message( STATUS "Using default path for standalone toolchain ${ANDROID_STANDALONE_TOOLCHAIN}" )
        message( STATUS "  If you prefer to use a different location, please define the variable: ANDROID_STANDALONE_TOOLCHAIN" )
       endif( ANDROID_STANDALONE_TOOLCHAIN )
      endif( ANDROID_NDK )
     endif( NOT ANDROID_STANDALONE_TOOLCHAIN )
    endif( NOT ANDROID_NDK )
    
    # remember found paths
    if( ANDROID_NDK )
     get_filename_component( ANDROID_NDK "${ANDROID_NDK}" ABSOLUTE )
     set( ANDROID_NDK "${ANDROID_NDK}" CACHE INTERNAL "Path of the Android NDK" FORCE )
     set( BUILD_WITH_ANDROID_NDK True )
     if( EXISTS "${ANDROID_NDK}/RELEASE.TXT" )
      file( STRINGS "${ANDROID_NDK}/RELEASE.TXT" ANDROID_NDK_RELEASE_FULL LIMIT_COUNT 1 REGEX "r[0-9]+[a-z]?" )
      string( REGEX MATCH "r([0-9]+)([a-z]?)" ANDROID_NDK_RELEASE "${ANDROID_NDK_RELEASE_FULL}" )
     elseif( EXISTS "${ANDROID_NDK}/source.properties")
      file( STRINGS "${ANDROID_NDK}/source.properties" ANDROID_NDK_RELEASE_FULL LIMIT_COUNT 1 REGEX "[0-9]+\\.[0-9]+\\.[0-9]+")
      string ( REGEX MATCH "([0-9]+)\\.([0-9]+)\\.([0-9]+)" ANDROID_NDK_RELEASE "${ANDROID_NDK_RELEASE_FULL}")
      string ( SUBSTRING "abcdefghijklmnopqastuvwxyz" ${CMAKE_MATCH_2} 1, ANDROID_NDK_RELEASE)
      string ( CONCAT ANDROID_NDK_RELEASE "r" ${CMAKE_MATCH_1} ${ANDROID_NDK_RELEASE} )
     else( STRINGS "${ANDROID_NDK}/RELEASE.TXT" ANDROID_NDK_RELEASE_FULL LIMIT_COUNT 1 REGEX "r[0-9]+[a-z]?" )
      set( ANDROID_NDK_RELEASE "r1x" )
      set( ANDROID_NDK_RELEASE_FULL "unreleased" )
     endif()
     string( REGEX REPLACE "r([0-9]+)([a-z]?)" "\\1*1000" ANDROID_NDK_RELEASE_NUM "${ANDROID_NDK_RELEASE}" )
     string( FIND " abcdefghijklmnopqastuvwxyz" "${CMAKE_MATCH_2}" __ndkReleaseLetterNum )
     math( EXPR ANDROID_NDK_RELEASE_NUM "${ANDROID_NDK_RELEASE_NUM}+${__ndkReleaseLetterNum}" )
     
    elseif( ANDROID_STANDALONE_TOOLCHAIN )
     get_filename_component( ANDROID_STANDALONE_TOOLCHAIN "${ANDROID_STANDALONE_TOOLCHAIN}" ABSOLUTE )
     # try to detect change
     if( CMAKE_AR )
      string( LENGTH "${ANDROID_STANDALONE_TOOLCHAIN}" __length )
      string( SUBSTRING "${CMAKE_AR}" 0 ${__length} __androidStandaloneToolchainPreviousPath )
      if( NOT __androidStandaloneToolchainPreviousPath STREQUAL ANDROID_STANDALONE_TOOLCHAIN )
       message( FATAL_ERROR "It is not possible to change path to the Android standalone toolchain on subsequent run." )
      endif()
      unset( __androidStandaloneToolchainPreviousPath )
      unset( __length )
     endif()
     set( ANDROID_STANDALONE_TOOLCHAIN "${ANDROID_STANDALONE_TOOLCHAIN}" CACHE INTERNAL "Path of the Android standalone toolchain" FORCE )
     set( BUILD_WITH_STANDALONE_TOOLCHAIN True )
    else()
     list(GET ANDROID_NDK_SEARCH_PATHS 0 ANDROID_NDK_SEARCH_PATH)
     message( FATAL_ERROR "Could not find neither Android NDK nor Android standalone toolchain.
        You should either set an environment variable:
          export ANDROID_NDK=~/my-android-ndk
        or
          export ANDROID_STANDALONE_TOOLCHAIN=~/my-android-toolchain
        or put the toolchain or NDK in the default path:
          sudo ln -s ~/my-android-ndk ${ANDROID_NDK_SEARCH_PATH}/android-ndk
          sudo ln -s ~/my-android-toolchain ${ANDROID_STANDALONE_TOOLCHAIN_SEARCH_PATH}" )
    endif()
    
    # android NDK layout
    if( BUILD_WITH_ANDROID_NDK )
     if( NOT DEFINED ANDROID_NDK_LAYOUT )
      # try to automatically detect the layout
      if( EXISTS "${ANDROID_NDK}/RELEASE.TXT")
       set( ANDROID_NDK_LAYOUT "RELEASE" )
      elseif( EXISTS "${ANDROID_NDK}/../../linux-x86/toolchain/" )
       set( ANDROID_NDK_LAYOUT "LINARO" )
      elseif( EXISTS "${ANDROID_NDK}/../../gcc/" )
       set( ANDROID_NDK_LAYOUT "ANDROID" )
      endif()
     endif()
     set( ANDROID_NDK_LAYOUT "${ANDROID_NDK_LAYOUT}" CACHE STRING "The inner layout of NDK" )
     mark_as_advanced( ANDROID_NDK_LAYOUT )
     if( ANDROID_NDK_LAYOUT STREQUAL "LINARO" )
      set( ANDROID_NDK_HOST_SYSTEM_NAME ${ANDROID_NDK_HOST_SYSTEM_NAME2} ) # only 32-bit at the moment
      set( ANDROID_NDK_TOOLCHAINS_PATH "${ANDROID_NDK}/../../${ANDROID_NDK_HOST_SYSTEM_NAME}/toolchain" )
      set( ANDROID_NDK_TOOLCHAINS_SUBPATH  "" )
      set( ANDROID_NDK_TOOLCHAINS_SUBPATH2 "" )
     elseif( ANDROID_NDK_LAYOUT STREQUAL "ANDROID" )
      set( ANDROID_NDK_HOST_SYSTEM_NAME ${ANDROID_NDK_HOST_SYSTEM_NAME2} ) # only 32-bit at the moment
      set( ANDROID_NDK_TOOLCHAINS_PATH "${ANDROID_NDK}/../../gcc/${ANDROID_NDK_HOST_SYSTEM_NAME}/arm" )
      set( ANDROID_NDK_TOOLCHAINS_SUBPATH  "" )
      set( ANDROID_NDK_TOOLCHAINS_SUBPATH2 "" )
     else() # ANDROID_NDK_LAYOUT STREQUAL "RELEASE"
      set( ANDROID_NDK_TOOLCHAINS_PATH "${ANDROID_NDK}/toolchains" )
      set( ANDROID_NDK_TOOLCHAINS_SUBPATH  "/prebuilt/${ANDROID_NDK_HOST_SYSTEM_NAME}" )
      set( ANDROID_NDK_TOOLCHAINS_SUBPATH2 "/prebuilt/${ANDROID_NDK_HOST_SYSTEM_NAME2}" )
     endif()
     get_filename_component( ANDROID_NDK_TOOLCHAINS_PATH "${ANDROID_NDK_TOOLCHAINS_PATH}" ABSOLUTE )
    
     # try to detect change of NDK
     if( CMAKE_AR )
      string( LENGTH "${ANDROID_NDK_TOOLCHAINS_PATH}" __length )
      string( SUBSTRING "${CMAKE_AR}" 0 ${__length} __androidNdkPreviousPath )
      if( NOT __androidNdkPreviousPath STREQUAL ANDROID_NDK_TOOLCHAINS_PATH )
       message( FATAL_ERROR "It is not possible to change the path to the NDK on subsequent CMake run. You must remove all generated files from your build folder first.
       " )
      endif()
      unset( __androidNdkPreviousPath )
      unset( __length )
     endif()
    endif()
    
    
    # get all the details about standalone toolchain
    if( BUILD_WITH_STANDALONE_TOOLCHAIN )
     __DETECT_NATIVE_API_LEVEL( ANDROID_SUPPORTED_NATIVE_API_LEVELS "${ANDROID_STANDALONE_TOOLCHAIN}/sysroot/usr/include/android/api-level.h" )
     set( ANDROID_STANDALONE_TOOLCHAIN_API_LEVEL ${ANDROID_SUPPORTED_NATIVE_API_LEVELS} )
     set( __availableToolchains "standalone" )
     __DETECT_TOOLCHAIN_MACHINE_NAME( __availableToolchainMachines "${ANDROID_STANDALONE_TOOLCHAIN}" )
     if( NOT __availableToolchainMachines )
      message( FATAL_ERROR "Could not determine machine name of your toolchain. Probably your Android standalone toolchain is broken." )
     endif()
     if( __availableToolchainMachines MATCHES x86_64 )
      set( __availableToolchainArchs "x86_64" )
     elseif( __availableToolchainMachines MATCHES i686 )
      set( __availableToolchainArchs "x86" )
     elseif( __availableToolchainMachines MATCHES aarch64 )
      set( __availableToolchainArchs "arm64" )
     elseif( __availableToolchainMachines MATCHES arm )
      set( __availableToolchainArchs "arm" )
     elseif( __availableToolchainMachines MATCHES mips64el )
      set( __availableToolchainArchs "mips64" )
     elseif( __availableToolchainMachines MATCHES mipsel )
      set( __availableToolchainArchs "mips" )
     endif()
     execute_process( COMMAND "${ANDROID_STANDALONE_TOOLCHAIN}/bin/${__availableToolchainMachines}-gcc${TOOL_OS_SUFFIX}" -dumpversion
                      OUTPUT_VARIABLE __availableToolchainCompilerVersions OUTPUT_STRIP_TRAILING_WHITESPACE )
     string( REGEX MATCH "[0-9]+[.][0-9]+([.][0-9]+)?" __availableToolchainCompilerVersions "${__availableToolchainCompilerVersions}" )
     if( EXISTS "${ANDROID_STANDALONE_TOOLCHAIN}/bin/clang${TOOL_OS_SUFFIX}" )
      list( APPEND __availableToolchains "standalone-clang" )
      list( APPEND __availableToolchainMachines ${__availableToolchainMachines} )
      list( APPEND __availableToolchainArchs ${__availableToolchainArchs} )
      list( APPEND __availableToolchainCompilerVersions ${__availableToolchainCompilerVersions} )
     endif()
    endif()
    
    macro( __GLOB_NDK_TOOLCHAINS __availableToolchainsVar __availableToolchainsLst __toolchain_subpath )
     foreach( __toolchain ${${__availableToolchainsLst}} )
      if( "${__toolchain}" MATCHES "-clang3[.][0-9]$" AND NOT EXISTS "${ANDROID_NDK_TOOLCHAINS_PATH}/${__toolchain}${__toolchain_subpath}" )
       SET( __toolchainVersionRegex "^TOOLCHAIN_VERSION[\t ]+:=[\t ]+(.*)$" )
       FILE( STRINGS "${ANDROID_NDK_TOOLCHAINS_PATH}/${__toolchain}/setup.mk" __toolchainVersionStr REGEX "${__toolchainVersionRegex}" )
       if( __toolchainVersionStr )
        string( REGEX REPLACE "${__toolchainVersionRegex}" "\\1" __toolchainVersionStr "${__toolchainVersionStr}" )
        string( REGEX REPLACE "-clang3[.][0-9]$" "-${__toolchainVersionStr}" __gcc_toolchain "${__toolchain}" )
       else()
        string( REGEX REPLACE "-clang3[.][0-9]$" "-4.6" __gcc_toolchain "${__toolchain}" )
       endif()
       unset( __toolchainVersionStr )
       unset( __toolchainVersionRegex )
      else()
       set( __gcc_toolchain "${__toolchain}" )
      endif()
      __DETECT_TOOLCHAIN_MACHINE_NAME( __machine "${ANDROID_NDK_TOOLCHAINS_PATH}/${__gcc_toolchain}${__toolchain_subpath}" )
      if( __machine )
       string( REGEX MATCH "[0-9]+[.][0-9]+([.][0-9x]+)?$" __version "${__gcc_toolchain}" )
       if( __machine MATCHES x86_64 )
        set( __arch "x86_64" )
       elseif( __machine MATCHES i686 )
        set( __arch "x86" )
       elseif( __machine MATCHES aarch64 )
        set( __arch "arm64" )
       elseif( __machine MATCHES arm )
        set( __arch "arm" )
       elseif( __machine MATCHES mips64el )
        set( __arch "mips64" )
       elseif( __machine MATCHES mipsel )
        set( __arch "mips" )
       else()
        set( __arch "" )
       endif()
       #message("machine: !${__machine}!\narch: !${__arch}!\nversion: !${__version}!\ntoolchain: !${__toolchain}!\n")
       if (__arch)
        list( APPEND __availableToolchainMachines "${__machine}" )
        list( APPEND __availableToolchainArchs "${__arch}" )
        list( APPEND __availableToolchainCompilerVersions "${__version}" )
        list( APPEND ${__availableToolchainsVar} "${__toolchain}" )
       endif()
      endif()
      unset( __gcc_toolchain )
     endforeach()
    endmacro()
    
    # get all the details about NDK
    if( BUILD_WITH_ANDROID_NDK )
     file( GLOB ANDROID_SUPPORTED_NATIVE_API_LEVELS RELATIVE "${ANDROID_NDK}/platforms" "${ANDROID_NDK}/platforms/android-*" )
     string( REPLACE "android-" "" ANDROID_SUPPORTED_NATIVE_API_LEVELS "${ANDROID_SUPPORTED_NATIVE_API_LEVELS}" )
     set( __availableToolchains "" )
     set( __availableToolchainMachines "" )
     set( __availableToolchainArchs "" )
     set( __availableToolchainCompilerVersions "" )
     if( ANDROID_TOOLCHAIN_NAME AND EXISTS "${ANDROID_NDK_TOOLCHAINS_PATH}/${ANDROID_TOOLCHAIN_NAME}/" )
      # do not go through all toolchains if we know the name
      set( __availableToolchainsLst "${ANDROID_TOOLCHAIN_NAME}" )
      __GLOB_NDK_TOOLCHAINS( __availableToolchains __availableToolchainsLst "${ANDROID_NDK_TOOLCHAINS_SUBPATH}" )
      if( NOT __availableToolchains AND NOT ANDROID_NDK_TOOLCHAINS_SUBPATH STREQUAL ANDROID_NDK_TOOLCHAINS_SUBPATH2 )
       __GLOB_NDK_TOOLCHAINS( __availableToolchains __availableToolchainsLst "${ANDROID_NDK_TOOLCHAINS_SUBPATH2}" )
       if( __availableToolchains )
        set( ANDROID_NDK_TOOLCHAINS_SUBPATH ${ANDROID_NDK_TOOLCHAINS_SUBPATH2} )
       endif()
      endif()
     endif()
     if( NOT __availableToolchains )
      file( GLOB __availableToolchainsLst RELATIVE "${ANDROID_NDK_TOOLCHAINS_PATH}" "${ANDROID_NDK_TOOLCHAINS_PATH}/*" )
      if( __availableToolchainsLst )
       list(SORT __availableToolchainsLst) # we need clang to go after gcc
      endif()
      __LIST_FILTER( __availableToolchainsLst "^[.]" )
      __LIST_FILTER( __availableToolchainsLst "llvm" )
      __LIST_FILTER( __availableToolchainsLst "renderscript" )
      __GLOB_NDK_TOOLCHAINS( __availableToolchains __availableToolchainsLst "${ANDROID_NDK_TOOLCHAINS_SUBPATH}" )
      if( NOT __availableToolchains AND NOT ANDROID_NDK_TOOLCHAINS_SUBPATH STREQUAL ANDROID_NDK_TOOLCHAINS_SUBPATH2 )
       __GLOB_NDK_TOOLCHAINS( __availableToolchains __availableToolchainsLst "${ANDROID_NDK_TOOLCHAINS_SUBPATH2}" )
       if( __availableToolchains )
        set( ANDROID_NDK_TOOLCHAINS_SUBPATH ${ANDROID_NDK_TOOLCHAINS_SUBPATH2} )
       endif()
      endif()
     endif()
     if( NOT __availableToolchains )
      message( FATAL_ERROR "Could not find any working toolchain in the NDK. Probably your Android NDK is broken." )
     endif()
    endif()
    
    # build list of available ABIs
    set( ANDROID_SUPPORTED_ABIS "" )
    set( __uniqToolchainArchNames ${__availableToolchainArchs} )
    list( REMOVE_DUPLICATES __uniqToolchainArchNames )
    list( SORT __uniqToolchainArchNames )
    foreach( __arch ${__uniqToolchainArchNames} )
     list( APPEND ANDROID_SUPPORTED_ABIS ${ANDROID_SUPPORTED_ABIS_${__arch}} )
    endforeach()
    unset( __uniqToolchainArchNames )
    if( NOT ANDROID_SUPPORTED_ABIS )
     message( FATAL_ERROR "No one of known Android ABIs is supported by this cmake toolchain." )
    endif()
    
    # choose target ABI
    __INIT_VARIABLE( ANDROID_ABI VALUES ${ANDROID_SUPPORTED_ABIS} )
    # verify that target ABI is supported
    list( FIND ANDROID_SUPPORTED_ABIS "${ANDROID_ABI}" __androidAbiIdx )
    if( __androidAbiIdx EQUAL -1 )
     string( REPLACE ";" "\", \"" PRINTABLE_ANDROID_SUPPORTED_ABIS  "${ANDROID_SUPPORTED_ABIS}" )
     message( FATAL_ERROR "Specified ANDROID_ABI = \"${ANDROID_ABI}\" is not supported by this cmake toolchain or your NDK/toolchain.
       Supported values are: \"${PRINTABLE_ANDROID_SUPPORTED_ABIS}\"
       " )
    endif()
    unset( __androidAbiIdx )
    
    # set target ABI options
    if( ANDROID_ABI STREQUAL "x86" )
     set( X86 true )
     set( ANDROID_NDK_ABI_NAME "x86" )
     set( ANDROID_ARCH_NAME "x86" )
     set( ANDROID_LLVM_TRIPLE "i686-none-linux-android" )
     set( CMAKE_SYSTEM_PROCESSOR "i686" )
    elseif( ANDROID_ABI STREQUAL "x86_64" )
     set( X86 true )
     set( X86_64 true )
     set( ANDROID_NDK_ABI_NAME "x86_64" )
     set( ANDROID_ARCH_NAME "x86_64" )
     set( CMAKE_SYSTEM_PROCESSOR "x86_64" )
     set( ANDROID_LLVM_TRIPLE "x86_64-none-linux-android" )
    elseif( ANDROID_ABI STREQUAL "mips64" )
     set( MIPS64 true )
     set( ANDROID_NDK_ABI_NAME "mips64" )
     set( ANDROID_ARCH_NAME "mips64" )
     set( ANDROID_LLVM_TRIPLE "mips64el-none-linux-android" )
     set( CMAKE_SYSTEM_PROCESSOR "mips64" )
    elseif( ANDROID_ABI STREQUAL "mips" )
     set( MIPS true )
     set( ANDROID_NDK_ABI_NAME "mips" )
     set( ANDROID_ARCH_NAME "mips" )
     set( ANDROID_LLVM_TRIPLE "mipsel-none-linux-android" )
     set( CMAKE_SYSTEM_PROCESSOR "mips" )
    elseif( ANDROID_ABI STREQUAL "arm64-v8a" )
     set( ARM64_V8A true )
     set( ANDROID_NDK_ABI_NAME "arm64-v8a" )
     set( ANDROID_ARCH_NAME "arm64" )
     set( ANDROID_LLVM_TRIPLE "aarch64-none-linux-android" )
     set( CMAKE_SYSTEM_PROCESSOR "aarch64" )
     set( VFPV3 true )
     set( NEON true )
    elseif( ANDROID_ABI STREQUAL "armeabi" )
     set( ARMEABI true )
     set( ANDROID_NDK_ABI_NAME "armeabi" )
     set( ANDROID_ARCH_NAME "arm" )
     set( ANDROID_LLVM_TRIPLE "armv5te-none-linux-androideabi" )
     set( CMAKE_SYSTEM_PROCESSOR "armv5te" )
    elseif( ANDROID_ABI STREQUAL "armeabi-v6 with VFP" )
     set( ARMEABI_V6 true )
     set( ANDROID_NDK_ABI_NAME "armeabi" )
     set( ANDROID_ARCH_NAME "arm" )
     set( ANDROID_LLVM_TRIPLE "armv5te-none-linux-androideabi" )
     set( CMAKE_SYSTEM_PROCESSOR "armv6" )
     # need always fallback to older platform
     set( ARMEABI true )
    elseif( ANDROID_ABI STREQUAL "armeabi-v7a")
     set( ARMEABI_V7A true )
     set( ANDROID_NDK_ABI_NAME "armeabi-v7a" )
     set( ANDROID_ARCH_NAME "arm" )
     set( ANDROID_LLVM_TRIPLE "armv7-none-linux-androideabi" )
     set( CMAKE_SYSTEM_PROCESSOR "armv7-a" )
    elseif( ANDROID_ABI STREQUAL "armeabi-v7a with VFPV3" )
     set( ARMEABI_V7A true )
     set( ANDROID_NDK_ABI_NAME "armeabi-v7a" )
     set( ANDROID_ARCH_NAME "arm" )
     set( ANDROID_LLVM_TRIPLE "armv7-none-linux-androideabi" )
     set( CMAKE_SYSTEM_PROCESSOR "armv7-a" )
     set( VFPV3 true )
    elseif( ANDROID_ABI STREQUAL "armeabi-v7a with NEON" )
     set( ARMEABI_V7A true )
     set( ANDROID_NDK_ABI_NAME "armeabi-v7a" )
     set( ANDROID_ARCH_NAME "arm" )
     set( ANDROID_LLVM_TRIPLE "armv7-none-linux-androideabi" )
     set( CMAKE_SYSTEM_PROCESSOR "armv7-a" )
     set( VFPV3 true )
     set( NEON true )
    else()
     message( SEND_ERROR "Unknown ANDROID_ABI=\"${ANDROID_ABI}\" is specified." )
    endif()
    
    if( CMAKE_BINARY_DIR AND EXISTS "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeSystem.cmake" )
     # really dirty hack
     # it is not possible to change CMAKE_SYSTEM_PROCESSOR after the first run...
     file( APPEND "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeSystem.cmake" "SET(CMAKE_SYSTEM_PROCESSOR \"${CMAKE_SYSTEM_PROCESSOR}\")\n" )
    endif()
    
    if( ANDROID_ARCH_NAME STREQUAL "arm" AND NOT ARMEABI_V6 )
     __INIT_VARIABLE( ANDROID_FORCE_ARM_BUILD VALUES OFF )
     set( ANDROID_FORCE_ARM_BUILD ${ANDROID_FORCE_ARM_BUILD} CACHE BOOL "Use 32-bit ARM instructions instead of Thumb-1" FORCE )
     mark_as_advanced( ANDROID_FORCE_ARM_BUILD )
    else()
     unset( ANDROID_FORCE_ARM_BUILD CACHE )
    endif()
    
    # choose toolchain
    if( ANDROID_TOOLCHAIN_NAME )
     list( FIND __availableToolchains "${ANDROID_TOOLCHAIN_NAME}" __toolchainIdx )
     if( __toolchainIdx EQUAL -1 )
      list( SORT __availableToolchains )
      string( REPLACE ";" "\n  * " toolchains_list "${__availableToolchains}" )
      set( toolchains_list "  * ${toolchains_list}")
      message( FATAL_ERROR "Specified toolchain \"${ANDROID_TOOLCHAIN_NAME}\" is missing in your NDK or broken. Please verify that your NDK is working or select another compiler toolchain.
    To configure the toolchain set CMake variable ANDROID_TOOLCHAIN_NAME to one of the following values:\n${toolchains_list}\n" )
     endif()
     list( GET __availableToolchainArchs ${__toolchainIdx} __toolchainArch )
     if( NOT __toolchainArch STREQUAL ANDROID_ARCH_NAME )
      message( SEND_ERROR "Selected toolchain \"${ANDROID_TOOLCHAIN_NAME}\" is not able to compile binaries for the \"${ANDROID_ARCH_NAME}\" platform." )
     endif()
    else()
     set( __toolchainIdx -1 )
     set( __applicableToolchains "" )
     set( __toolchainMaxVersion "0.0.0" )
     list( LENGTH __availableToolchains __availableToolchainsCount )
     math( EXPR __availableToolchainsCount "${__availableToolchainsCount}-1" )
     foreach( __idx RANGE ${__availableToolchainsCount} )
      list( GET __availableToolchainArchs ${__idx} __toolchainArch )
      if( __toolchainArch STREQUAL ANDROID_ARCH_NAME )
       list( GET __availableToolchainCompilerVersions ${__idx} __toolchainVersion )
       string( REPLACE "x" "99" __toolchainVersion "${__toolchainVersion}")
       if( __toolchainVersion VERSION_GREATER __toolchainMaxVersion )
        set( __toolchainMaxVersion "${__toolchainVersion}" )
        set( __toolchainIdx ${__idx} )
       endif()
      endif()
     endforeach()
     unset( __availableToolchainsCount )
     unset( __toolchainMaxVersion )
     unset( __toolchainVersion )
    endif()
    unset( __toolchainArch )
    if( __toolchainIdx EQUAL -1 )
     message( FATAL_ERROR "No one of available compiler toolchains is able to compile for ${ANDROID_ARCH_NAME} platform." )
    endif()
    list( GET __availableToolchains ${__toolchainIdx} ANDROID_TOOLCHAIN_NAME )
    list( GET __availableToolchainMachines ${__toolchainIdx} ANDROID_TOOLCHAIN_MACHINE_NAME )
    list( GET __availableToolchainCompilerVersions ${__toolchainIdx} ANDROID_COMPILER_VERSION )
    
    unset( __toolchainIdx )
    unset( __availableToolchains )
    unset( __availableToolchainMachines )
    unset( __availableToolchainArchs )
    unset( __availableToolchainCompilerVersions )
    
    # choose native API level
    __INIT_VARIABLE( ANDROID_NATIVE_API_LEVEL ENV_ANDROID_NATIVE_API_LEVEL ANDROID_API_LEVEL ENV_ANDROID_API_LEVEL ANDROID_STANDALONE_TOOLCHAIN_API_LEVEL ANDROID_DEFAULT_NDK_API_LEVEL_${ANDROID_ARCH_NAME} ANDROID_DEFAULT_NDK_API_LEVEL )
    string( REPLACE "android-" "" ANDROID_NATIVE_API_LEVEL "${ANDROID_NATIVE_API_LEVEL}" )
    string( STRIP "${ANDROID_NATIVE_API_LEVEL}" ANDROID_NATIVE_API_LEVEL )
    # adjust API level
    set( __real_api_level ${ANDROID_DEFAULT_NDK_API_LEVEL_${ANDROID_ARCH_NAME}} )
    foreach( __level ${ANDROID_SUPPORTED_NATIVE_API_LEVELS} )
     if( (__level LESS ANDROID_NATIVE_API_LEVEL OR __level STREQUAL ANDROID_NATIVE_API_LEVEL) AND NOT __level LESS __real_api_level )
      set( __real_api_level ${__level} )
     endif()
    endforeach()
    if( __real_api_level AND NOT ANDROID_NATIVE_API_LEVEL STREQUAL __real_api_level )
     message( STATUS "Adjusting Android API level 'android-${ANDROID_NATIVE_API_LEVEL}' to 'android-${__real_api_level}'")
     set( ANDROID_NATIVE_API_LEVEL ${__real_api_level} )
    endif()
    unset(__real_api_level)
    # validate
    list( FIND ANDROID_SUPPORTED_NATIVE_API_LEVELS "${ANDROID_NATIVE_API_LEVEL}" __levelIdx )
    if( __levelIdx EQUAL -1 )
     message( SEND_ERROR "Specified Android native API level 'android-${ANDROID_NATIVE_API_LEVEL}' is not supported by your NDK/toolchain." )
    else()
    #  if( BUILD_WITH_ANDROID_NDK )
    #   __DETECT_NATIVE_API_LEVEL( __realApiLevel "${ANDROID_NDK}/platforms/android-${ANDROID_NATIVE_API_LEVEL}/arch-${ANDROID_ARCH_NAME}/usr/include/android/api-level.h" )
    #   if( NOT __realApiLevel EQUAL ANDROID_NATIVE_API_LEVEL AND NOT __realApiLevel GREATER 9000 )
    #    message( SEND_ERROR "Specified Android API level (${ANDROID_NATIVE_API_LEVEL}) does not match to the level found (${__realApiLevel}). Probably your copy of NDK is broken." )
    #   endif()
    #   unset( __realApiLevel )
    #  endif()
     set( ANDROID_NATIVE_API_LEVEL "${ANDROID_NATIVE_API_LEVEL}" CACHE STRING "Android API level for native code" FORCE )
     set( CMAKE_ANDROID_API ${ANDROID_NATIVE_API_LEVEL} )
     if( CMAKE_VERSION VERSION_GREATER "2.8" )
      list( SORT ANDROID_SUPPORTED_NATIVE_API_LEVELS )
      set_property( CACHE ANDROID_NATIVE_API_LEVEL PROPERTY STRINGS ${ANDROID_SUPPORTED_NATIVE_API_LEVELS} )
     endif()
    endif()
    unset( __levelIdx )
    
    
    # remember target ABI
    set( ANDROID_ABI "${ANDROID_ABI}" CACHE STRING "The target ABI for Android. If arm, then armeabi-v7a is recommended for hardware floating point." FORCE )
    if( CMAKE_VERSION VERSION_GREATER "2.8" )
     list( SORT ANDROID_SUPPORTED_ABIS_${ANDROID_ARCH_NAME} )
     set_property( CACHE ANDROID_ABI PROPERTY STRINGS ${ANDROID_SUPPORTED_ABIS_${ANDROID_ARCH_NAME}} )
    endif()
    
    
    # runtime choice (STL, rtti, exceptions)
    if( NOT ANDROID_STL )
      set( ANDROID_STL gnustl_static )
    endif()
    set( ANDROID_STL "${ANDROID_STL}" CACHE STRING "C++ runtime" )
    set( ANDROID_STL_FORCE_FEATURES ON CACHE BOOL "automatically configure rtti and exceptions support based on C++ runtime" )
    mark_as_advanced( ANDROID_STL ANDROID_STL_FORCE_FEATURES )
    
    if( BUILD_WITH_ANDROID_NDK )
     if( NOT "${ANDROID_STL}" MATCHES "^(none|system|system_re|gabi\\+\\+_static|gabi\\+\\+_shared|stlport_static|stlport_shared|gnustl_static|gnustl_shared)$")
      message( FATAL_ERROR "ANDROID_STL is set to invalid value \"${ANDROID_STL}\".
    The possible values are:
      none           -> Do not configure the runtime.
      system         -> Use the default minimal system C++ runtime library.
      system_re      -> Same as system but with rtti and exceptions.
      gabi++_static  -> Use the GAbi++ runtime as a static library.
      gabi++_shared  -> Use the GAbi++ runtime as a shared library.
      stlport_static -> Use the STLport runtime as a static library.
      stlport_shared -> Use the STLport runtime as a shared library.
      gnustl_static  -> (default) Use the GNU STL as a static library.
      gnustl_shared  -> Use the GNU STL as a shared library.
    " )
     endif()
    elseif( BUILD_WITH_STANDALONE_TOOLCHAIN )
     if( NOT "${ANDROID_STL}" MATCHES "^(none|gnustl_static|gnustl_shared)$")
      message( FATAL_ERROR "ANDROID_STL is set to invalid value \"${ANDROID_STL}\".
    The possible values are:
      none           -> Do not configure the runtime.
      gnustl_static  -> (default) Use the GNU STL as a static library.
      gnustl_shared  -> Use the GNU STL as a shared library.
    " )
     endif()
    endif()
    
    unset( ANDROID_RTTI )
    unset( ANDROID_EXCEPTIONS )
    unset( ANDROID_STL_INCLUDE_DIRS )
    unset( __libstl )
    unset( __libsupcxx )
    
    if( NOT _CMAKE_IN_TRY_COMPILE AND ANDROID_NDK_RELEASE STREQUAL "r7b" AND ARMEABI_V7A AND NOT VFPV3 AND ANDROID_STL MATCHES "gnustl" )
     message( WARNING  "The GNU STL armeabi-v7a binaries from NDK r7b can crash non-NEON devices. The files provided with NDK r7b were not configured properly, resulting in crashes on Tegra2-based devices and others when trying to use certain floating-point functions (e.g., cosf, sinf, expf).
    You are strongly recommended to switch to another NDK release.
    " )
    endif()
    
    if( NOT _CMAKE_IN_TRY_COMPILE AND X86 AND ANDROID_STL MATCHES "gnustl" AND ANDROID_NDK_RELEASE STREQUAL "r6" )
      message( WARNING  "The x86 system header file from NDK r6 has incorrect definition for ptrdiff_t. You are recommended to upgrade to a newer NDK release or manually patch the header:
    See https://android.googlesource.com/platform/development.git f907f4f9d4e56ccc8093df6fee54454b8bcab6c2
      diff --git a/ndk/platforms/android-9/arch-x86/include/machine/_types.h b/ndk/platforms/android-9/arch-x86/include/machine/_types.h
      index 5e28c64..65892a1 100644
      --- a/ndk/platforms/android-9/arch-x86/include/machine/_types.h
      +++ b/ndk/platforms/android-9/arch-x86/include/machine/_types.h
      @@ -51,7 +51,11 @@ typedef long int       ssize_t;
       #endif
       #ifndef _PTRDIFF_T
       #define _PTRDIFF_T
      -typedef long           ptrdiff_t;
      +#  ifdef __ANDROID__
      +     typedef int            ptrdiff_t;
      +#  else
      +     typedef long           ptrdiff_t;
      +#  endif
       #endif
    " )
    endif()
    
    
    # setup paths and STL for standalone toolchain
    if( BUILD_WITH_STANDALONE_TOOLCHAIN )
     set( ANDROID_TOOLCHAIN_ROOT "${ANDROID_STANDALONE_TOOLCHAIN}" )
     set( ANDROID_CLANG_TOOLCHAIN_ROOT "${ANDROID_STANDALONE_TOOLCHAIN}" )
     set( ANDROID_SYSROOT "${ANDROID_STANDALONE_TOOLCHAIN}/sysroot" )
    
     if( NOT ANDROID_STL STREQUAL "none" )
      set( ANDROID_STL_INCLUDE_DIRS "${ANDROID_STANDALONE_TOOLCHAIN}/include/c++/${ANDROID_COMPILER_VERSION}" )
      if( NOT EXISTS "${ANDROID_STL_INCLUDE_DIRS}" )
       # old location ( pre r8c )
       set( ANDROID_STL_INCLUDE_DIRS "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/include/c++/${ANDROID_COMPILER_VERSION}" )
      endif()
      if( ARMEABI_V7A AND EXISTS "${ANDROID_STL_INCLUDE_DIRS}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/${CMAKE_SYSTEM_PROCESSOR}/bits" )
       list( APPEND ANDROID_STL_INCLUDE_DIRS "${ANDROID_STL_INCLUDE_DIRS}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/${CMAKE_SYSTEM_PROCESSOR}" )
      elseif( ARMEABI AND NOT ANDROID_FORCE_ARM_BUILD AND EXISTS "${ANDROID_STL_INCLUDE_DIRS}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/thumb/bits" )
       list( APPEND ANDROID_STL_INCLUDE_DIRS "${ANDROID_STL_INCLUDE_DIRS}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/thumb" )
      else()
       list( APPEND ANDROID_STL_INCLUDE_DIRS "${ANDROID_STL_INCLUDE_DIRS}/${ANDROID_TOOLCHAIN_MACHINE_NAME}" )
      endif()
      # always search static GNU STL to get the location of libsupc++.a
      if( ARMEABI_V7A AND NOT ANDROID_FORCE_ARM_BUILD AND EXISTS "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}/thumb/libstdc++.a" )
       set( __libstl "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}/thumb" )
      elseif( ARMEABI_V7A AND EXISTS "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}/libstdc++.a" )
       set( __libstl "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}" )
      elseif( ARMEABI AND NOT ANDROID_FORCE_ARM_BUILD AND EXISTS "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/thumb/libstdc++.a" )
       set( __libstl "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/thumb" )
      elseif( EXISTS "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/libstdc++.a" )
       set( __libstl "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib" )
      endif()
      if( __libstl )
       set( __libsupcxx "${__libstl}/libsupc++.a" )
       set( __libstl    "${__libstl}/libstdc++.a" )
      endif()
      if( NOT EXISTS "${__libsupcxx}" )
       message( FATAL_ERROR "The required libstdsupc++.a is missing in your standalone toolchain.
     Usually it happens because of bug in make-standalone-toolchain.sh script from NDK r7, r7b and r7c.
     You need to either upgrade to newer NDK or manually copy
         $ANDROID_NDK/sources/cxx-stl/gnu-libstdc++/libs/${ANDROID_NDK_ABI_NAME}/libsupc++.a
     to
         ${__libsupcxx}
       " )
      endif()
      if( ANDROID_STL STREQUAL "gnustl_shared" )
       if( ARMEABI_V7A AND EXISTS "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}/libgnustl_shared.so" )
        set( __libstl "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}/libgnustl_shared.so" )
       elseif( ARMEABI AND NOT ANDROID_FORCE_ARM_BUILD AND EXISTS "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/thumb/libgnustl_shared.so" )
        set( __libstl "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/thumb/libgnustl_shared.so" )
       elseif( EXISTS "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/libgnustl_shared.so" )
        set( __libstl "${ANDROID_STANDALONE_TOOLCHAIN}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/libgnustl_shared.so" )
       endif()
      endif()
     endif()
    endif()
    
    # clang
    if( "${ANDROID_TOOLCHAIN_NAME}" STREQUAL "standalone-clang" )
     set( ANDROID_COMPILER_IS_CLANG 1 )
     execute_process( COMMAND "${ANDROID_CLANG_TOOLCHAIN_ROOT}/bin/clang${TOOL_OS_SUFFIX}" --version OUTPUT_VARIABLE ANDROID_CLANG_VERSION OUTPUT_STRIP_TRAILING_WHITESPACE )
     string( REGEX MATCH "[0-9]+[.][0-9]+" ANDROID_CLANG_VERSION "${ANDROID_CLANG_VERSION}")
    elseif( "${ANDROID_TOOLCHAIN_NAME}" MATCHES "-clang3[.][0-9]?$" )
     string( REGEX MATCH "3[.][0-9]$" ANDROID_CLANG_VERSION "${ANDROID_TOOLCHAIN_NAME}")
     string( REGEX REPLACE "-clang${ANDROID_CLANG_VERSION}$" "-${ANDROID_COMPILER_VERSION}" ANDROID_GCC_TOOLCHAIN_NAME "${ANDROID_TOOLCHAIN_NAME}" )
     if( NOT EXISTS "${ANDROID_NDK_TOOLCHAINS_PATH}/llvm-${ANDROID_CLANG_VERSION}${ANDROID_NDK_TOOLCHAINS_SUBPATH}/bin/clang${TOOL_OS_SUFFIX}" )
      message( FATAL_ERROR "Could not find the Clang compiler driver" )
     endif()
     set( ANDROID_COMPILER_IS_CLANG 1 )
     set( ANDROID_CLANG_TOOLCHAIN_ROOT "${ANDROID_NDK_TOOLCHAINS_PATH}/llvm-${ANDROID_CLANG_VERSION}${ANDROID_NDK_TOOLCHAINS_SUBPATH}" )
    else()
     set( ANDROID_GCC_TOOLCHAIN_NAME "${ANDROID_TOOLCHAIN_NAME}" )
     unset( ANDROID_COMPILER_IS_CLANG CACHE )
    endif()
    
    string( REPLACE "." "" _clang_name "clang${ANDROID_CLANG_VERSION}" )
    if( NOT EXISTS "${ANDROID_CLANG_TOOLCHAIN_ROOT}/bin/${_clang_name}${TOOL_OS_SUFFIX}" )
     set( _clang_name "clang" )
    endif()
    
    
    # setup paths and STL for NDK
    if( BUILD_WITH_ANDROID_NDK )
     set( ANDROID_TOOLCHAIN_ROOT "${ANDROID_NDK_TOOLCHAINS_PATH}/${ANDROID_GCC_TOOLCHAIN_NAME}${ANDROID_NDK_TOOLCHAINS_SUBPATH}" )
     set( ANDROID_SYSROOT "${ANDROID_NDK}/platforms/android-${ANDROID_NATIVE_API_LEVEL}/arch-${ANDROID_ARCH_NAME}" )
    
     if( ANDROID_STL STREQUAL "none" )
      # do nothing
     elseif( ANDROID_STL STREQUAL "system" )
      set( ANDROID_RTTI             OFF )
      set( ANDROID_EXCEPTIONS       OFF )
      set( ANDROID_STL_INCLUDE_DIRS "${ANDROID_NDK}/sources/cxx-stl/system/include" )
     elseif( ANDROID_STL STREQUAL "system_re" )
      set( ANDROID_RTTI             ON )
      set( ANDROID_EXCEPTIONS       ON )
      set( ANDROID_STL_INCLUDE_DIRS "${ANDROID_NDK}/sources/cxx-stl/system/include" )
     elseif( ANDROID_STL MATCHES "gabi" )
      if( ANDROID_NDK_RELEASE_NUM LESS 7000 ) # before r7
       message( FATAL_ERROR "gabi++ is not available in your NDK. You have to upgrade to NDK r7 or newer to use gabi++.")
      endif()
      set( ANDROID_RTTI             ON )
      set( ANDROID_EXCEPTIONS       OFF )
      set( ANDROID_STL_INCLUDE_DIRS "${ANDROID_NDK}/sources/cxx-stl/gabi++/include" )
      set( __libstl                 "${ANDROID_NDK}/sources/cxx-stl/gabi++/libs/${ANDROID_NDK_ABI_NAME}/libgabi++_static.a" )
     elseif( ANDROID_STL MATCHES "stlport" )
      if( NOT ANDROID_NDK_RELEASE_NUM LESS 8004 ) # before r8d
       set( ANDROID_EXCEPTIONS       ON )
      else()
       set( ANDROID_EXCEPTIONS       OFF )
      endif()
      if( ANDROID_NDK_RELEASE_NUM LESS 7000 ) # before r7
       set( ANDROID_RTTI            OFF )
      else()
       set( ANDROID_RTTI            ON )
      endif()
      set( ANDROID_STL_INCLUDE_DIRS "${ANDROID_NDK}/sources/cxx-stl/stlport/stlport" )
      set( __libstl                 "${ANDROID_NDK}/sources/cxx-stl/stlport/libs/${ANDROID_NDK_ABI_NAME}/libstlport_static.a" )
     elseif( ANDROID_STL MATCHES "gnustl" )
      set( ANDROID_EXCEPTIONS       ON )
      set( ANDROID_RTTI             ON )
      if( EXISTS "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/${ANDROID_COMPILER_VERSION}" )
       if( ARMEABI_V7A AND ANDROID_COMPILER_VERSION VERSION_EQUAL "4.7" AND ANDROID_NDK_RELEASE STREQUAL "r8d" )
        # gnustl binary for 4.7 compiler is buggy :(
        # TODO: look for right fix
        set( __libstl                "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/4.6" )
       else()
        set( __libstl                "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/${ANDROID_COMPILER_VERSION}" )
       endif()
      else()
       set( __libstl                "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++" )
      endif()
      set( ANDROID_STL_INCLUDE_DIRS "${__libstl}/include" "${__libstl}/libs/${ANDROID_NDK_ABI_NAME}/include" "${__libstl}/include/backward" )
      if( EXISTS "${__libstl}/libs/${ANDROID_NDK_ABI_NAME}/libgnustl_static.a" )
       set( __libstl                "${__libstl}/libs/${ANDROID_NDK_ABI_NAME}/libgnustl_static.a" )
      else()
       set( __libstl                "${__libstl}/libs/${ANDROID_NDK_ABI_NAME}/libstdc++.a" )
      endif()
     else()
      message( FATAL_ERROR "Unknown runtime: ${ANDROID_STL}" )
     endif()
     # find libsupc++.a - rtti & exceptions
     if( ANDROID_STL STREQUAL "system_re" OR ANDROID_STL MATCHES "gnustl" )
      set( __libsupcxx "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/${ANDROID_COMPILER_VERSION}/libs/${ANDROID_NDK_ABI_NAME}/libsupc++.a" ) # r8b or newer
      if( NOT EXISTS "${__libsupcxx}" )
       set( __libsupcxx "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/libs/${ANDROID_NDK_ABI_NAME}/libsupc++.a" ) # r7-r8
      endif()
      if( NOT EXISTS "${__libsupcxx}" ) # before r7
       if( ARMEABI_V7A )
        if( ANDROID_FORCE_ARM_BUILD )
         set( __libsupcxx "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}/libsupc++.a" )
        else()
         set( __libsupcxx "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/${CMAKE_SYSTEM_PROCESSOR}/thumb/libsupc++.a" )
        endif()
       elseif( ARMEABI AND NOT ANDROID_FORCE_ARM_BUILD )
        set( __libsupcxx "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/thumb/libsupc++.a" )
       else()
        set( __libsupcxx "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}/lib/libsupc++.a" )
       endif()
      endif()
      if( NOT EXISTS "${__libsupcxx}")
       message( ERROR "Could not find libsupc++.a for a chosen platform. Either your NDK is not supported or is broken.")
      endif()
     endif()
    endif()
    
    
    # case of shared STL linkage
    if( ANDROID_STL MATCHES "shared" AND DEFINED __libstl )
     string( REPLACE "_static.a" "_shared.so" __libstl "${__libstl}" )
     # TODO: check if .so file exists before the renaming
    endif()
    
    
    # ccache support
    __INIT_VARIABLE( _ndk_ccache NDK_CCACHE ENV_NDK_CCACHE )
    if( _ndk_ccache )
     if( DEFINED NDK_CCACHE AND NOT EXISTS NDK_CCACHE )
      unset( NDK_CCACHE CACHE )
     endif()
     find_program( NDK_CCACHE "${_ndk_ccache}" DOC "The path to ccache binary")
    else()
     unset( NDK_CCACHE CACHE )
    endif()
    unset( _ndk_ccache )
    
    
    # setup the cross-compiler
    if( NOT CMAKE_C_COMPILER )
     if( NDK_CCACHE AND NOT ANDROID_SYSROOT MATCHES "[ ;\"]" )
      set( CMAKE_C_COMPILER   "${NDK_CCACHE}" CACHE PATH "ccache as C compiler" )
      set( CMAKE_CXX_COMPILER "${NDK_CCACHE}" CACHE PATH "ccache as C++ compiler" )
      if( ANDROID_COMPILER_IS_CLANG )
       set( CMAKE_C_COMPILER_ARG1   "${ANDROID_CLANG_TOOLCHAIN_ROOT}/bin/${_clang_name}${TOOL_OS_SUFFIX}"   CACHE PATH "C compiler")
       set( CMAKE_CXX_COMPILER_ARG1 "${ANDROID_CLANG_TOOLCHAIN_ROOT}/bin/${_clang_name}++${TOOL_OS_SUFFIX}" CACHE PATH "C++ compiler")
      else()
       set( CMAKE_C_COMPILER_ARG1   "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-gcc${TOOL_OS_SUFFIX}" CACHE PATH "C compiler")
       set( CMAKE_CXX_COMPILER_ARG1 "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-g++${TOOL_OS_SUFFIX}" CACHE PATH "C++ compiler")
      endif()
     else()
      if( ANDROID_COMPILER_IS_CLANG )
       set( CMAKE_C_COMPILER   "${ANDROID_CLANG_TOOLCHAIN_ROOT}/bin/${_clang_name}${TOOL_OS_SUFFIX}"   CACHE PATH "C compiler")
       set( CMAKE_CXX_COMPILER "${ANDROID_CLANG_TOOLCHAIN_ROOT}/bin/${_clang_name}++${TOOL_OS_SUFFIX}" CACHE PATH "C++ compiler")
      else()
       set( CMAKE_C_COMPILER   "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-gcc${TOOL_OS_SUFFIX}"    CACHE PATH "C compiler" )
       set( CMAKE_CXX_COMPILER "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-g++${TOOL_OS_SUFFIX}"    CACHE PATH "C++ compiler" )
      endif()
     endif()
     set( CMAKE_ASM_COMPILER "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-gcc${TOOL_OS_SUFFIX}"     CACHE PATH "assembler" )
     set( CMAKE_STRIP        "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-strip${TOOL_OS_SUFFIX}"   CACHE PATH "strip" )
     if( EXISTS "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-gcc-ar${TOOL_OS_SUFFIX}" )
      # Use gcc-ar if we have it for better LTO support.
      set( CMAKE_AR           "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-gcc-ar${TOOL_OS_SUFFIX}"      CACHE PATH "archive" )
     else()
      set( CMAKE_AR           "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-ar${TOOL_OS_SUFFIX}"      CACHE PATH "archive" )
     endif()
     set( CMAKE_LINKER       "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-ld${TOOL_OS_SUFFIX}"      CACHE PATH "linker" )
     set( CMAKE_NM           "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-nm${TOOL_OS_SUFFIX}"      CACHE PATH "nm" )
     set( CMAKE_OBJCOPY      "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-objcopy${TOOL_OS_SUFFIX}" CACHE PATH "objcopy" )
     set( CMAKE_OBJDUMP      "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-objdump${TOOL_OS_SUFFIX}" CACHE PATH "objdump" )
     set( CMAKE_RANLIB       "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_MACHINE_NAME}-ranlib${TOOL_OS_SUFFIX}"  CACHE PATH "ranlib" )
    endif()
    
    set( _CMAKE_TOOLCHAIN_PREFIX "${ANDROID_TOOLCHAIN_MACHINE_NAME}-" )
    if( CMAKE_VERSION VERSION_LESS 2.8.5 )
     set( CMAKE_ASM_COMPILER_ARG1 "-c" )
    endif()
    if( APPLE )
     find_program( CMAKE_INSTALL_NAME_TOOL NAMES install_name_tool )
     if( NOT CMAKE_INSTALL_NAME_TOOL )
      message( FATAL_ERROR "Could not find install_name_tool, please check your installation." )
     endif()
     mark_as_advanced( CMAKE_INSTALL_NAME_TOOL )
    endif()
    
    # Force set compilers because standard identification works badly for us
    include( CMakeForceCompiler )
    CMAKE_FORCE_C_COMPILER( "${CMAKE_C_COMPILER}" GNU )
    if( ANDROID_COMPILER_IS_CLANG )
     set( CMAKE_C_COMPILER_ID Clang )
    endif()
    set( CMAKE_C_PLATFORM_ID Linux )
    if( X86_64 OR MIPS64 OR ARM64_V8A )
     set( CMAKE_C_SIZEOF_DATA_PTR 8 )
    else()
     set( CMAKE_C_SIZEOF_DATA_PTR 4 )
    endif()
    set( CMAKE_C_HAS_ISYSROOT 1 )
    set( CMAKE_C_COMPILER_ABI ELF )
    CMAKE_FORCE_CXX_COMPILER( "${CMAKE_CXX_COMPILER}" GNU )
    if( ANDROID_COMPILER_IS_CLANG )
     set( CMAKE_CXX_COMPILER_ID Clang)
    endif()
    set( CMAKE_CXX_PLATFORM_ID Linux )
    set( CMAKE_CXX_SIZEOF_DATA_PTR ${CMAKE_C_SIZEOF_DATA_PTR} )
    set( CMAKE_CXX_HAS_ISYSROOT 1 )
    set( CMAKE_CXX_COMPILER_ABI ELF )
    set( CMAKE_CXX_SOURCE_FILE_EXTENSIONS cc cp cxx cpp CPP c++ C )
    # force ASM compiler (required for CMake < 2.8.5)
    set( CMAKE_ASM_COMPILER_ID_RUN TRUE )
    set( CMAKE_ASM_COMPILER_ID GNU )
    set( CMAKE_ASM_COMPILER_WORKS TRUE )
    set( CMAKE_ASM_COMPILER_FORCED TRUE )
    set( CMAKE_COMPILER_IS_GNUASM 1)
    set( CMAKE_ASM_SOURCE_FILE_EXTENSIONS s S asm )
    
    foreach( lang C CXX ASM )
     if( ANDROID_COMPILER_IS_CLANG )
      set( CMAKE_${lang}_COMPILER_VERSION ${ANDROID_CLANG_VERSION} )
     else()
      set( CMAKE_${lang}_COMPILER_VERSION ${ANDROID_COMPILER_VERSION} )
     endif()
    endforeach()
    
    # flags and definitions
    remove_definitions( -DANDROID )
    add_definitions( -DANDROID )
    
    if( ANDROID_SYSROOT MATCHES "[ ;\"]" )
     if( CMAKE_HOST_WIN32 )
      # try to convert path to 8.3 form
      file( WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/cvt83.cmd" "@echo %~s1" )
      execute_process( COMMAND "$ENV{ComSpec}" /c "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/cvt83.cmd" "${ANDROID_SYSROOT}"
                       OUTPUT_VARIABLE __path OUTPUT_STRIP_TRAILING_WHITESPACE
                       RESULT_VARIABLE __result ERROR_QUIET )
      if( __result EQUAL 0 )
       file( TO_CMAKE_PATH "${__path}" ANDROID_SYSROOT )
       set( ANDROID_CXX_FLAGS "--sysroot=${ANDROID_SYSROOT}" )
      else()
       set( ANDROID_CXX_FLAGS "--sysroot=\"${ANDROID_SYSROOT}\"" )
      endif()
     else()
      set( ANDROID_CXX_FLAGS "'--sysroot=${ANDROID_SYSROOT}'" )
     endif()
     if( NOT _CMAKE_IN_TRY_COMPILE )
      # quotes can break try_compile and compiler identification
      message(WARNING "Path to your Android NDK (or toolchain) has non-alphanumeric symbols.\nThe build might be broken.\n")
     endif()
    else()
     set( ANDROID_CXX_FLAGS "--sysroot=${ANDROID_SYSROOT}" )
    endif()
    
    # NDK flags
    if (ARM64_V8A )
     set( ANDROID_CXX_FLAGS         "${ANDROID_CXX_FLAGS} -funwind-tables" )
     set( ANDROID_CXX_FLAGS_RELEASE "-fomit-frame-pointer -fstrict-aliasing" )
     set( ANDROID_CXX_FLAGS_DEBUG   "-fno-omit-frame-pointer -fno-strict-aliasing" )
     if( NOT ANDROID_COMPILER_IS_CLANG )
      set( ANDROID_CXX_FLAGS_RELEASE "${ANDROID_CXX_FLAGS_RELEASE} -funswitch-loops -finline-limit=300" )
     endif()
    elseif( ARMEABI OR ARMEABI_V7A)
     set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -funwind-tables" )
     if( NOT ANDROID_FORCE_ARM_BUILD AND NOT ARMEABI_V6 )
      set( ANDROID_CXX_FLAGS_RELEASE "-mthumb -fomit-frame-pointer -fno-strict-aliasing" )
      set( ANDROID_CXX_FLAGS_DEBUG   "-marm -fno-omit-frame-pointer -fno-strict-aliasing" )
      if( NOT ANDROID_COMPILER_IS_CLANG )
       set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -finline-limit=64" )
      endif()
     else()
      # always compile ARMEABI_V6 in arm mode; otherwise there is no difference from ARMEABI
      set( ANDROID_CXX_FLAGS_RELEASE "-marm -fomit-frame-pointer -fstrict-aliasing" )
      set( ANDROID_CXX_FLAGS_DEBUG   "-marm -fno-omit-frame-pointer -fno-strict-aliasing" )
      if( NOT ANDROID_COMPILER_IS_CLANG )
       set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -funswitch-loops -finline-limit=300" )
      endif()
     endif()
    elseif( X86 OR X86_64 )
     set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -funwind-tables" )
     if( NOT ANDROID_COMPILER_IS_CLANG )
      set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -funswitch-loops -finline-limit=300" )
     endif()
     set( ANDROID_CXX_FLAGS_RELEASE "-fomit-frame-pointer -fstrict-aliasing" )
     set( ANDROID_CXX_FLAGS_DEBUG   "-fno-omit-frame-pointer -fno-strict-aliasing" )
    elseif( MIPS OR MIPS64 )
     set( ANDROID_CXX_FLAGS         "${ANDROID_CXX_FLAGS} -fno-strict-aliasing -finline-functions -funwind-tables -fmessage-length=0" )
     set( ANDROID_CXX_FLAGS_RELEASE "-fomit-frame-pointer" )
     set( ANDROID_CXX_FLAGS_DEBUG   "-fno-omit-frame-pointer" )
     if( NOT ANDROID_COMPILER_IS_CLANG )
      set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -fno-inline-functions-called-once -fgcse-after-reload -frerun-cse-after-loop -frename-registers" )
      set( ANDROID_CXX_FLAGS_RELEASE "${ANDROID_CXX_FLAGS_RELEASE} -funswitch-loops -finline-limit=300" )
     endif()
    elseif()
     set( ANDROID_CXX_FLAGS_RELEASE "" )
     set( ANDROID_CXX_FLAGS_DEBUG   "" )
    endif()
    
    set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -fsigned-char" ) # good/necessary when porting desktop libraries
    
    if( NOT X86 AND NOT ANDROID_COMPILER_IS_CLANG )
     set( ANDROID_CXX_FLAGS "-Wno-psabi ${ANDROID_CXX_FLAGS}" )
    endif()
    
    if( NOT ANDROID_COMPILER_VERSION VERSION_LESS "4.6" )
     set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -no-canonical-prefixes" ) # see https://android-review.googlesource.com/#/c/47564/
    endif()
    
    # ABI-specific flags
    if( ARMEABI_V7A )
     set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -march=armv7-a -mfloat-abi=softfp" )
     if( NEON )
      set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -mfpu=neon" )
     elseif( VFPV3 )
      set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -mfpu=vfpv3" )
     else()
      set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -mfpu=vfpv3-d16" )
     endif()
    elseif( ARMEABI_V6 )
     set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -march=armv6 -mfloat-abi=softfp -mfpu=vfp" ) # vfp == vfpv2
    elseif( ARMEABI )
     set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -march=armv5te -mtune=xscale -msoft-float" )
    endif()
    
    if( ANDROID_STL MATCHES "gnustl" AND (EXISTS "${__libstl}" OR EXISTS "${__libsupcxx}") )
     set( CMAKE_CXX_CREATE_SHARED_LIBRARY "<CMAKE_C_COMPILER> <CMAKE_SHARED_LIBRARY_CXX_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS> <CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>" )
     set( CMAKE_CXX_CREATE_SHARED_MODULE  "<CMAKE_C_COMPILER> <CMAKE_SHARED_LIBRARY_CXX_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS> <CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>" )
     set( CMAKE_CXX_LINK_EXECUTABLE       "<CMAKE_C_COMPILER> <FLAGS> <CMAKE_CXX_LINK_FLAGS> <LINK_FLAGS> <OBJECTS> -o <TARGET> <LINK_LIBRARIES>" )
    else()
     set( CMAKE_CXX_CREATE_SHARED_LIBRARY "<CMAKE_CXX_COMPILER> <CMAKE_SHARED_LIBRARY_CXX_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS> <CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>" )
     set( CMAKE_CXX_CREATE_SHARED_MODULE  "<CMAKE_CXX_COMPILER> <CMAKE_SHARED_LIBRARY_CXX_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS> <CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>" )
     set( CMAKE_CXX_LINK_EXECUTABLE       "<CMAKE_CXX_COMPILER> <FLAGS> <CMAKE_CXX_LINK_FLAGS> <LINK_FLAGS> <OBJECTS> -o <TARGET> <LINK_LIBRARIES>" )
    endif()
    
    # STL
    if( EXISTS "${__libstl}" OR EXISTS "${__libsupcxx}" )
     if( EXISTS "${__libstl}" )
      set( CMAKE_CXX_CREATE_SHARED_LIBRARY "${CMAKE_CXX_CREATE_SHARED_LIBRARY} \"${__libstl}\"" )
      set( CMAKE_CXX_CREATE_SHARED_MODULE  "${CMAKE_CXX_CREATE_SHARED_MODULE} \"${__libstl}\"" )
      set( CMAKE_CXX_LINK_EXECUTABLE       "${CMAKE_CXX_LINK_EXECUTABLE} \"${__libstl}\"" )
     endif()
     if( EXISTS "${__libsupcxx}" )
      set( CMAKE_CXX_CREATE_SHARED_LIBRARY "${CMAKE_CXX_CREATE_SHARED_LIBRARY} \"${__libsupcxx}\"" )
      set( CMAKE_CXX_CREATE_SHARED_MODULE  "${CMAKE_CXX_CREATE_SHARED_MODULE} \"${__libsupcxx}\"" )
      set( CMAKE_CXX_LINK_EXECUTABLE       "${CMAKE_CXX_LINK_EXECUTABLE} \"${__libsupcxx}\"" )
      # C objects:
      set( CMAKE_C_CREATE_SHARED_LIBRARY "<CMAKE_C_COMPILER> <CMAKE_SHARED_LIBRARY_C_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS> <CMAKE_SHARED_LIBRARY_SONAME_C_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>" )
      set( CMAKE_C_CREATE_SHARED_MODULE  "<CMAKE_C_COMPILER> <CMAKE_SHARED_LIBRARY_C_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS> <CMAKE_SHARED_LIBRARY_SONAME_C_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>" )
      set( CMAKE_C_LINK_EXECUTABLE       "<CMAKE_C_COMPILER> <FLAGS> <CMAKE_C_LINK_FLAGS> <LINK_FLAGS> <OBJECTS> -o <TARGET> <LINK_LIBRARIES>" )
      set( CMAKE_C_CREATE_SHARED_LIBRARY "${CMAKE_C_CREATE_SHARED_LIBRARY} \"${__libsupcxx}\"" )
      set( CMAKE_C_CREATE_SHARED_MODULE  "${CMAKE_C_CREATE_SHARED_MODULE} \"${__libsupcxx}\"" )
      set( CMAKE_C_LINK_EXECUTABLE       "${CMAKE_C_LINK_EXECUTABLE} \"${__libsupcxx}\"" )
     endif()
     if( ANDROID_STL MATCHES "gnustl" )
      if( NOT EXISTS "${ANDROID_LIBM_PATH}" )
       set( ANDROID_LIBM_PATH -lm )
      endif()
      set( CMAKE_CXX_CREATE_SHARED_LIBRARY "${CMAKE_CXX_CREATE_SHARED_LIBRARY} ${ANDROID_LIBM_PATH}" )
      set( CMAKE_CXX_CREATE_SHARED_MODULE  "${CMAKE_CXX_CREATE_SHARED_MODULE} ${ANDROID_LIBM_PATH}" )
      set( CMAKE_CXX_LINK_EXECUTABLE       "${CMAKE_CXX_LINK_EXECUTABLE} ${ANDROID_LIBM_PATH}" )
     endif()
    endif()
    
    # variables controlling optional build flags
    if( ANDROID_NDK_RELEASE_NUM LESS 7000 ) # before r7
     # libGLESv2.so in NDK's prior to r7 refers to missing external symbols.
     # So this flag option is required for all projects using OpenGL from native.
     __INIT_VARIABLE( ANDROID_SO_UNDEFINED                      VALUES ON )
    else()
     __INIT_VARIABLE( ANDROID_SO_UNDEFINED                      VALUES OFF )
    endif()
    __INIT_VARIABLE( ANDROID_NO_UNDEFINED                       VALUES ON )
    __INIT_VARIABLE( ANDROID_FUNCTION_LEVEL_LINKING             VALUES ON )
    __INIT_VARIABLE( ANDROID_GOLD_LINKER                        VALUES ON )
    __INIT_VARIABLE( ANDROID_NOEXECSTACK                        VALUES ON )
    __INIT_VARIABLE( ANDROID_RELRO                              VALUES ON )
    
    set( ANDROID_NO_UNDEFINED           ${ANDROID_NO_UNDEFINED}           CACHE BOOL "Show all undefined symbols as linker errors" )
    set( ANDROID_SO_UNDEFINED           ${ANDROID_SO_UNDEFINED}           CACHE BOOL "Allows or disallows undefined symbols in shared libraries" )
    set( ANDROID_FUNCTION_LEVEL_LINKING ${ANDROID_FUNCTION_LEVEL_LINKING} CACHE BOOL "Put each function in separate section and enable garbage collection of unused input sections at link time" )
    set( ANDROID_GOLD_LINKER            ${ANDROID_GOLD_LINKER}            CACHE BOOL "Enables gold linker" )
    set( ANDROID_NOEXECSTACK            ${ANDROID_NOEXECSTACK}            CACHE BOOL "Allows or disallows undefined symbols in shared libraries" )
    set( ANDROID_RELRO                  ${ANDROID_RELRO}                  CACHE BOOL "Enables RELRO - a memory corruption mitigation technique" )
    mark_as_advanced( ANDROID_NO_UNDEFINED ANDROID_SO_UNDEFINED ANDROID_FUNCTION_LEVEL_LINKING ANDROID_GOLD_LINKER ANDROID_NOEXECSTACK ANDROID_RELRO )
    
    # linker flags
    set( ANDROID_LINKER_FLAGS "" )
    
    if( ARMEABI_V7A )
     # this is *required* to use the following linker flags that routes around
     # a CPU bug in some Cortex-A8 implementations:
     set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -Wl,--fix-cortex-a8" )
    endif()
    
    if( ANDROID_NO_UNDEFINED )
     if( MIPS )
      # there is some sysroot-related problem in mips linker...
      if( NOT ANDROID_SYSROOT MATCHES "[ ;\"]" )
       set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -Wl,--no-undefined -Wl,-rpath-link,${ANDROID_SYSROOT}/usr/lib" )
      endif()
     else()
      set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -Wl,--no-undefined" )
     endif()
    endif()
    
    if( ANDROID_SO_UNDEFINED )
     set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -Wl,-allow-shlib-undefined" )
    endif()
    
    if( ANDROID_FUNCTION_LEVEL_LINKING )
     set( ANDROID_CXX_FLAGS    "${ANDROID_CXX_FLAGS} -fdata-sections -ffunction-sections" )
     set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -Wl,--gc-sections" )
    endif()
    
    if( ANDROID_COMPILER_VERSION VERSION_EQUAL "4.6" )
     if( ANDROID_GOLD_LINKER AND (CMAKE_HOST_UNIX OR ANDROID_NDK_RELEASE_NUM GREATER 8002) AND (ARMEABI OR ARMEABI_V7A OR X86) )
      set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -fuse-ld=gold" )
     elseif( ANDROID_NDK_RELEASE_NUM GREATER 8002 ) # after r8b
      set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -fuse-ld=bfd" )
     elseif( ANDROID_NDK_RELEASE STREQUAL "r8b" AND ARMEABI AND NOT _CMAKE_IN_TRY_COMPILE )
      message( WARNING "The default bfd linker from arm GCC 4.6 toolchain can fail with 'unresolvable R_ARM_THM_CALL relocation' error message. See https://code.google.com/p/android/issues/detail?id=35342
      On Linux and OS X host platform you can workaround this problem using gold linker (default).
      Rerun cmake with -DANDROID_GOLD_LINKER=ON option in case of problems.
    " )
     endif()
    endif() # version 4.6
    
    if( ANDROID_NOEXECSTACK )
     if( ANDROID_COMPILER_IS_CLANG )
      set( ANDROID_CXX_FLAGS    "${ANDROID_CXX_FLAGS} -Xclang -mnoexecstack" )
     else()
      set( ANDROID_CXX_FLAGS    "${ANDROID_CXX_FLAGS} -Wa,--noexecstack" )
     endif()
     set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -Wl,-z,noexecstack" )
    endif()
    
    if( ANDROID_RELRO )
     set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -Wl,-z,relro -Wl,-z,now" )
    endif()
    
    if( ANDROID_COMPILER_IS_CLANG )
     set( ANDROID_CXX_FLAGS "-target ${ANDROID_LLVM_TRIPLE} -Qunused-arguments ${ANDROID_CXX_FLAGS}" )
     if( BUILD_WITH_ANDROID_NDK )
      set( ANDROID_CXX_FLAGS "-gcc-toolchain ${ANDROID_TOOLCHAIN_ROOT} ${ANDROID_CXX_FLAGS}" )
     endif()
    endif()
    
    # cache flags
    set( CMAKE_CXX_FLAGS           ""                        CACHE STRING "c++ flags" )
    set( CMAKE_C_FLAGS             ""                        CACHE STRING "c flags" )
    set( CMAKE_CXX_FLAGS_RELEASE   "-O3 -DNDEBUG"            CACHE STRING "c++ Release flags" )
    set( CMAKE_C_FLAGS_RELEASE     "-O3 -DNDEBUG"            CACHE STRING "c Release flags" )
    set( CMAKE_CXX_FLAGS_DEBUG     "-O0 -g -DDEBUG -D_DEBUG" CACHE STRING "c++ Debug flags" )
    set( CMAKE_C_FLAGS_DEBUG       "-O0 -g -DDEBUG -D_DEBUG" CACHE STRING "c Debug flags" )
    set( CMAKE_SHARED_LINKER_FLAGS ""                        CACHE STRING "shared linker flags" )
    set( CMAKE_MODULE_LINKER_FLAGS ""                        CACHE STRING "module linker flags" )
    set( CMAKE_EXE_LINKER_FLAGS    "-Wl,-z,nocopyreloc"      CACHE STRING "executable linker flags" )
    
    # put flags to cache (for debug purpose only)
    set( ANDROID_CXX_FLAGS         "${ANDROID_CXX_FLAGS}"         CACHE INTERNAL "Android specific c/c++ flags" )
    set( ANDROID_CXX_FLAGS_RELEASE "${ANDROID_CXX_FLAGS_RELEASE}" CACHE INTERNAL "Android specific c/c++ Release flags" )
    set( ANDROID_CXX_FLAGS_DEBUG   "${ANDROID_CXX_FLAGS_DEBUG}"   CACHE INTERNAL "Android specific c/c++ Debug flags" )
    set( ANDROID_LINKER_FLAGS      "${ANDROID_LINKER_FLAGS}"      CACHE INTERNAL "Android specific c/c++ linker flags" )
    
    # finish flags
    set( CMAKE_CXX_FLAGS           "${ANDROID_CXX_FLAGS} ${CMAKE_CXX_FLAGS}" )
    set( CMAKE_C_FLAGS             "${ANDROID_CXX_FLAGS} ${CMAKE_C_FLAGS}" )
    set( CMAKE_CXX_FLAGS_RELEASE   "${ANDROID_CXX_FLAGS_RELEASE} ${CMAKE_CXX_FLAGS_RELEASE}" )
    set( CMAKE_C_FLAGS_RELEASE     "${ANDROID_CXX_FLAGS_RELEASE} ${CMAKE_C_FLAGS_RELEASE}" )
    set( CMAKE_CXX_FLAGS_DEBUG     "${ANDROID_CXX_FLAGS_DEBUG} ${CMAKE_CXX_FLAGS_DEBUG}" )
    set( CMAKE_C_FLAGS_DEBUG       "${ANDROID_CXX_FLAGS_DEBUG} ${CMAKE_C_FLAGS_DEBUG}" )
    set( CMAKE_SHARED_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} ${CMAKE_SHARED_LINKER_FLAGS}" )
    set( CMAKE_MODULE_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} ${CMAKE_MODULE_LINKER_FLAGS}" )
    set( CMAKE_EXE_LINKER_FLAGS    "${ANDROID_LINKER_FLAGS} ${CMAKE_EXE_LINKER_FLAGS}" )
    
    if( MIPS AND BUILD_WITH_ANDROID_NDK AND ANDROID_NDK_RELEASE STREQUAL "r8" )
     set( CMAKE_SHARED_LINKER_FLAGS "-Wl,-T,${ANDROID_NDK_TOOLCHAINS_PATH}/${ANDROID_GCC_TOOLCHAIN_NAME}/mipself.xsc ${CMAKE_SHARED_LINKER_FLAGS}" )
     set( CMAKE_MODULE_LINKER_FLAGS "-Wl,-T,${ANDROID_NDK_TOOLCHAINS_PATH}/${ANDROID_GCC_TOOLCHAIN_NAME}/mipself.xsc ${CMAKE_MODULE_LINKER_FLAGS}" )
     set( CMAKE_EXE_LINKER_FLAGS    "-Wl,-T,${ANDROID_NDK_TOOLCHAINS_PATH}/${ANDROID_GCC_TOOLCHAIN_NAME}/mipself.x ${CMAKE_EXE_LINKER_FLAGS}" )
    endif()
    
    # pie/pic
    if( NOT (ANDROID_NATIVE_API_LEVEL LESS 16) AND (NOT DEFINED ANDROID_APP_PIE OR ANDROID_APP_PIE) AND (CMAKE_VERSION VERSION_GREATER 2.8.8) )
     set( CMAKE_POSITION_INDEPENDENT_CODE TRUE )
     set( CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fPIE -pie")
    else()
     set( CMAKE_POSITION_INDEPENDENT_CODE FALSE )
     set( CMAKE_CXX_FLAGS "-fpic ${CMAKE_CXX_FLAGS}" )
     set( CMAKE_C_FLAGS   "-fpic ${CMAKE_C_FLAGS}" )
    endif()
    
    # configure rtti
    if( DEFINED ANDROID_RTTI AND ANDROID_STL_FORCE_FEATURES )
     if( ANDROID_RTTI )
      set( CMAKE_CXX_FLAGS "-frtti ${CMAKE_CXX_FLAGS}" )
     else()
      set( CMAKE_CXX_FLAGS "-fno-rtti ${CMAKE_CXX_FLAGS}" )
     endif()
    endif()
    
    # configure exceptios
    if( DEFINED ANDROID_EXCEPTIONS AND ANDROID_STL_FORCE_FEATURES )
     if( ANDROID_EXCEPTIONS )
      set( CMAKE_CXX_FLAGS "-fexceptions ${CMAKE_CXX_FLAGS}" )
      set( CMAKE_C_FLAGS "-fexceptions ${CMAKE_C_FLAGS}" )
     else()
      set( CMAKE_CXX_FLAGS "-fno-exceptions ${CMAKE_CXX_FLAGS}" )
      set( CMAKE_C_FLAGS "-fno-exceptions ${CMAKE_C_FLAGS}" )
     endif()
    endif()
    
    # global includes and link directories
    include_directories( SYSTEM "${ANDROID_SYSROOT}/usr/include" ${ANDROID_STL_INCLUDE_DIRS} )
    get_filename_component(__android_install_path "${CMAKE_INSTALL_PREFIX}/libs/${ANDROID_NDK_ABI_NAME}" ABSOLUTE) # avoid CMP0015 policy warning
    link_directories( "${__android_install_path}" )
    
    # detect if need link crtbegin_so.o explicitly
    if( NOT DEFINED ANDROID_EXPLICIT_CRT_LINK )
     set( __cmd "${CMAKE_CXX_CREATE_SHARED_LIBRARY}" )
     string( REPLACE "<CMAKE_CXX_COMPILER>" "${CMAKE_CXX_COMPILER} ${CMAKE_CXX_COMPILER_ARG1}" __cmd "${__cmd}" )
     string( REPLACE "<CMAKE_C_COMPILER>"   "${CMAKE_C_COMPILER} ${CMAKE_C_COMPILER_ARG1}"   __cmd "${__cmd}" )
     string( REPLACE "<CMAKE_SHARED_LIBRARY_CXX_FLAGS>" "${CMAKE_CXX_FLAGS}" __cmd "${__cmd}" )
     string( REPLACE "<LANGUAGE_COMPILE_FLAGS>" "" __cmd "${__cmd}" )
     string( REPLACE "<LINK_FLAGS>" "${CMAKE_SHARED_LINKER_FLAGS}" __cmd "${__cmd}" )
     string( REPLACE "<CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS>" "-shared" __cmd "${__cmd}" )
     string( REPLACE "<CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG>" "" __cmd "${__cmd}" )
     string( REPLACE "<TARGET_SONAME>" "" __cmd "${__cmd}" )
     string( REPLACE "<TARGET>" "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/toolchain_crtlink_test.so" __cmd "${__cmd}" )
     string( REPLACE "<OBJECTS>" "\"${ANDROID_SYSROOT}/usr/lib/crtbegin_so.o\"" __cmd "${__cmd}" )
     string( REPLACE "<LINK_LIBRARIES>" "" __cmd "${__cmd}" )
     separate_arguments( __cmd )
     foreach( __var ANDROID_NDK ANDROID_NDK_TOOLCHAINS_PATH ANDROID_STANDALONE_TOOLCHAIN )
      if( ${__var} )
       set( __tmp "${${__var}}" )
       separate_arguments( __tmp )
       string( REPLACE "${__tmp}" "${${__var}}" __cmd "${__cmd}")
      endif()
     endforeach()
     string( REPLACE "'" "" __cmd "${__cmd}" )
     string( REPLACE "\"" "" __cmd "${__cmd}" )
     execute_process( COMMAND ${__cmd} RESULT_VARIABLE __cmd_result OUTPUT_QUIET ERROR_QUIET )
     if( __cmd_result EQUAL 0 )
      set( ANDROID_EXPLICIT_CRT_LINK ON )
     else()
      set( ANDROID_EXPLICIT_CRT_LINK OFF )
     endif()
    endif()
    
    if( ANDROID_EXPLICIT_CRT_LINK )
     set( CMAKE_CXX_CREATE_SHARED_LIBRARY "${CMAKE_CXX_CREATE_SHARED_LIBRARY} \"${ANDROID_SYSROOT}/usr/lib/crtbegin_so.o\"" )
     set( CMAKE_CXX_CREATE_SHARED_MODULE  "${CMAKE_CXX_CREATE_SHARED_MODULE} \"${ANDROID_SYSROOT}/usr/lib/crtbegin_so.o\"" )
    endif()
    
    # setup output directories
    set( CMAKE_INSTALL_PREFIX "${ANDROID_TOOLCHAIN_ROOT}/user" CACHE STRING "path for installing" )
    
    if( DEFINED LIBRARY_OUTPUT_PATH_ROOT
          OR EXISTS "${CMAKE_SOURCE_DIR}/AndroidManifest.xml"
          OR (EXISTS "${CMAKE_SOURCE_DIR}/../AndroidManifest.xml" AND EXISTS "${CMAKE_SOURCE_DIR}/../jni/") )
      set( LIBRARY_OUTPUT_PATH_ROOT ${CMAKE_SOURCE_DIR} CACHE PATH "Root for binaries output, set this to change where Android libs are installed to" )
      if( NOT _CMAKE_IN_TRY_COMPILE )
        if( EXISTS "${CMAKE_SOURCE_DIR}/jni/CMakeLists.txt" )
          set( EXECUTABLE_OUTPUT_PATH "${LIBRARY_OUTPUT_PATH_ROOT}/bin/${ANDROID_NDK_ABI_NAME}" CACHE PATH "Output directory for applications" )
        else()
          set( EXECUTABLE_OUTPUT_PATH "${LIBRARY_OUTPUT_PATH_ROOT}/bin" CACHE PATH "Output directory for applications" )
        endif()
        set( LIBRARY_OUTPUT_PATH "${LIBRARY_OUTPUT_PATH_ROOT}/libs/${ANDROID_NDK_ABI_NAME}" CACHE PATH "Output directory for Android libs" )
      endif()
    endif()
    
    # copy shaed stl library to build directory
    if( NOT _CMAKE_IN_TRY_COMPILE AND __libstl MATCHES "[.]so$" AND DEFINED LIBRARY_OUTPUT_PATH )
      get_filename_component( __libstlname "${__libstl}" NAME )
      execute_process( COMMAND "${CMAKE_COMMAND}" -E copy_if_different "${__libstl}" "${LIBRARY_OUTPUT_PATH}/${__libstlname}" RESULT_VARIABLE __fileCopyProcess )
      if( NOT __fileCopyProcess EQUAL 0 OR NOT EXISTS "${LIBRARY_OUTPUT_PATH}/${__libstlname}")
        message( SEND_ERROR "Failed copying of ${__libstl} to the ${LIBRARY_OUTPUT_PATH}/${__libstlname}" )
      endif()
      unset( __fileCopyProcess )
      unset( __libstlname )
    endif()
    
    
    # set these global flags for cmake client scripts to change behavior
    set( ANDROID True )
    set( BUILD_ANDROID True )
    
    # where is the target environment
    set( CMAKE_FIND_ROOT_PATH "${ANDROID_TOOLCHAIN_ROOT}/bin" "${ANDROID_TOOLCHAIN_ROOT}/${ANDROID_TOOLCHAIN_MACHINE_NAME}" "${ANDROID_SYSROOT}" "${CMAKE_INSTALL_PREFIX}" "${CMAKE_INSTALL_PREFIX}/share" )
    
    # only search for libraries and includes in the ndk toolchain
    set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY )
    set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
    set( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
    
    
    # macro to find packages on the host OS
    macro( find_host_package )
     set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
     set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY NEVER )
     set( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE NEVER )
     if( CMAKE_HOST_WIN32 )
      SET( WIN32 1 )
      SET( UNIX )
     elseif( CMAKE_HOST_APPLE )
      SET( APPLE 1 )
      SET( UNIX )
     endif()
     find_package( ${ARGN} )
     SET( WIN32 )
     SET( APPLE )
     SET( UNIX 1 )
     set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY )
     set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
     set( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
    endmacro()
    
    
    # macro to find programs on the host OS
    macro( find_host_program )
     set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
     set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY NEVER )
     set( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE NEVER )
     if( CMAKE_HOST_WIN32 )
      SET( WIN32 1 )
      SET( UNIX )
     elseif( CMAKE_HOST_APPLE )
      SET( APPLE 1 )
      SET( UNIX )
     endif()
     find_program( ${ARGN} )
     SET( WIN32 )
     SET( APPLE )
     SET( UNIX 1 )
     set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY )
     set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
     set( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
    endmacro()
    
    
    # export toolchain settings for the try_compile() command
    if( NOT _CMAKE_IN_TRY_COMPILE )
     set( __toolchain_config "")
     foreach( __var NDK_CCACHE  LIBRARY_OUTPUT_PATH_ROOT  ANDROID_FORBID_SYGWIN
                    ANDROID_NDK_HOST_X64
                    ANDROID_NDK
                    ANDROID_NDK_LAYOUT
                    ANDROID_STANDALONE_TOOLCHAIN
                    ANDROID_TOOLCHAIN_NAME
                    ANDROID_ABI
                    ANDROID_NATIVE_API_LEVEL
                    ANDROID_STL
                    ANDROID_STL_FORCE_FEATURES
                    ANDROID_FORCE_ARM_BUILD
                    ANDROID_NO_UNDEFINED
                    ANDROID_SO_UNDEFINED
                    ANDROID_FUNCTION_LEVEL_LINKING
                    ANDROID_GOLD_LINKER
                    ANDROID_NOEXECSTACK
                    ANDROID_RELRO
                    ANDROID_LIBM_PATH
                    ANDROID_EXPLICIT_CRT_LINK
                    ANDROID_APP_PIE
                    )
      if( DEFINED ${__var} )
       if( ${__var} MATCHES " ")
        set( __toolchain_config "${__toolchain_config}set( ${__var} \"${${__var}}\" CACHE INTERNAL \"\" )\n" )
       else()
        set( __toolchain_config "${__toolchain_config}set( ${__var} ${${__var}} CACHE INTERNAL \"\" )\n" )
       endif()
      endif()
     endforeach()
     file( WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/android.toolchain.config.cmake" "${__toolchain_config}" )
     unset( __toolchain_config )
    endif()
    
    
    # force cmake to produce / instead of \ in build commands for Ninja generator
    if( CMAKE_GENERATOR MATCHES "Ninja" AND CMAKE_HOST_WIN32 )
     # it is a bad hack after all
     # CMake generates Ninja makefiles with UNIX paths only if it thinks that we are going to build with MinGW
     set( CMAKE_COMPILER_IS_MINGW TRUE ) # tell CMake that we are MinGW
     set( CMAKE_CROSSCOMPILING TRUE )    # stop recursion
     enable_language( C )
     enable_language( CXX )
     # unset( CMAKE_COMPILER_IS_MINGW ) # can't unset because CMake does not convert back-slashes in response files without it
     unset( MINGW )
    endif()
    
    
    # Variables controlling behavior or set by cmake toolchain:
    #   ANDROID_ABI : "armeabi-v7a" (default), "armeabi", "armeabi-v7a with NEON", "armeabi-v7a with VFPV3", "armeabi-v6 with VFP", "x86", "mips", "arm64-v8a", "x86_64", "mips64"
    #   ANDROID_NATIVE_API_LEVEL : 3,4,5,8,9,14,15,16,17,18,19,21 (depends on NDK version)
    #   ANDROID_STL : gnustl_static/gnustl_shared/stlport_static/stlport_shared/gabi++_static/gabi++_shared/system_re/system/none
    #   ANDROID_FORBID_SYGWIN : ON/OFF
    #   ANDROID_NO_UNDEFINED : ON/OFF
    #   ANDROID_SO_UNDEFINED : OFF/ON  (default depends on NDK version)
    #   ANDROID_FUNCTION_LEVEL_LINKING : ON/OFF
    #   ANDROID_GOLD_LINKER : ON/OFF
    #   ANDROID_NOEXECSTACK : ON/OFF
    #   ANDROID_RELRO : ON/OFF
    #   ANDROID_FORCE_ARM_BUILD : ON/OFF
    #   ANDROID_STL_FORCE_FEATURES : ON/OFF
    #   ANDROID_LIBM_PATH : path to libm.so (set to something like $(TOP)/out/target/product/<product_name>/obj/lib/libm.so) to workaround unresolved `sincos`
    # Can be set only at the first run:
    #   ANDROID_NDK : path to your NDK install
    #   NDK_CCACHE : path to your ccache executable
    #   ANDROID_TOOLCHAIN_NAME : the NDK name of compiler toolchain
    #   ANDROID_NDK_HOST_X64 : try to use x86_64 toolchain (default for x64 host systems)
    #   ANDROID_NDK_LAYOUT : the inner NDK structure (RELEASE, LINARO, ANDROID)
    #   LIBRARY_OUTPUT_PATH_ROOT : <any valid path>
    #   ANDROID_STANDALONE_TOOLCHAIN
    #
    # Primary read-only variables:
    #   ANDROID : always TRUE
    #   ARMEABI : TRUE for arm v6 and older devices
    #   ARMEABI_V6 : TRUE for arm v6
    #   ARMEABI_V7A : TRUE for arm v7a
    #   ARM64_V8A : TRUE for arm64-v8a
    #   NEON : TRUE if NEON unit is enabled
    #   VFPV3 : TRUE if VFP version 3 is enabled
    #   X86 : TRUE if configured for x86
    #   X86_64 : TRUE if configured for x86_64
    #   MIPS : TRUE if configured for mips
    #   MIPS64 : TRUE if configured for mips64
    #   BUILD_WITH_ANDROID_NDK : TRUE if NDK is used
    #   BUILD_WITH_STANDALONE_TOOLCHAIN : TRUE if standalone toolchain is used
    #   ANDROID_NDK_HOST_SYSTEM_NAME : "windows", "linux-x86" or "darwin-x86" depending on host platform
    #   ANDROID_NDK_ABI_NAME : "armeabi", "armeabi-v7a", "x86", "mips", "arm64-v8a", "x86_64", "mips64" depending on ANDROID_ABI
    #   ANDROID_NDK_RELEASE : from r5 to r10d; set only for NDK
    #   ANDROID_NDK_RELEASE_NUM : numeric ANDROID_NDK_RELEASE version (1000*major+minor)
    #   ANDROID_ARCH_NAME : "arm", "x86", "mips", "arm64", "x86_64", "mips64" depending on ANDROID_ABI
    #   ANDROID_SYSROOT : path to the compiler sysroot
    #   TOOL_OS_SUFFIX : "" or ".exe" depending on host platform
    #   ANDROID_COMPILER_IS_CLANG : TRUE if clang compiler is used
    #
    # Secondary (less stable) read-only variables:
    #   ANDROID_COMPILER_VERSION : GCC version used (not Clang version)
    #   ANDROID_CLANG_VERSION : version of clang compiler if clang is used
    #   ANDROID_CXX_FLAGS : C/C++ compiler flags required by Android platform
    #   ANDROID_SUPPORTED_ABIS : list of currently allowed values for ANDROID_ABI
    #   ANDROID_TOOLCHAIN_MACHINE_NAME : "arm-linux-androideabi", "arm-eabi" or "i686-android-linux"
    #   ANDROID_TOOLCHAIN_ROOT : path to the top level of toolchain (standalone or placed inside NDK)
    #   ANDROID_CLANG_TOOLCHAIN_ROOT : path to clang tools
    #   ANDROID_SUPPORTED_NATIVE_API_LEVELS : list of native API levels found inside NDK
    #   ANDROID_STL_INCLUDE_DIRS : stl include paths
    #   ANDROID_RTTI : if rtti is enabled by the runtime
    #   ANDROID_EXCEPTIONS : if exceptions are enabled by the runtime
    #   ANDROID_GCC_TOOLCHAIN_NAME : read-only, differs from ANDROID_TOOLCHAIN_NAME only if clang is used
    #
    # Defaults:
    #   ANDROID_DEFAULT_NDK_API_LEVEL
    #   ANDROID_DEFAULT_NDK_API_LEVEL_${ARCH}
    #   ANDROID_NDK_SEARCH_PATHS
    #   ANDROID_SUPPORTED_ABIS_${ARCH}
    #   ANDROID_SUPPORTED_NDK_VERSIONS
    
    
    opened by lightgoleft 1
  • How to complie to a library.so file ?

    How to complie to a library.so file ?

    Hi everyone, I am trying to compile pangolin with an android project, and the very fist case is create file lib.so. I think I should do something with file CMakeList.txt and file build.gardle in project. I tried this build gardle cmakelist

    but the library created is only 5kb, so I think something went wrong , If some one know how to fix please help me. lib so

    opened by yuri4029 0
  • Adding fp16 support

    Adding fp16 support

    I tried to follow the same protocol that existing code use to support fp16. For many deep learning libraries such as https://github.com/Maratyszcza/nnpack , fp16 provides a good win performance wise.

    opened by Yangqing 0
  • Add support for NDK r16b

    Add support for NDK r16b

    I think android-cmake doesn't support NDK r16b yet. In the NDK r16b, there's no include directory in ndk-r16b/andorid-**/arch-**/usr.

    CMake Error at toolchain/android.toolchain.cmake:308 (file):
      file STRINGS file
      "/.../android-ndk-r16b/platforms/android-21/arch-arm/usr/include/android/api-level.h"
      cannot be read.
    Call Stack (most recent call first):
      toolchain/android.toolchain.cmake:803 (__DETECT_NATIVE_API_LEVEL)
      /usr/local/Cellar/cmake/3.10.1/share/cmake/Modules/CMakeDetermineSystem.cmake:91 (include)
      CMakeLists.txt:2 (project)
    
    
    CMake Error at toolchain/android.toolchain.cmake:805 (message):
      Specified Android API level (21) does not match to the level found ().
      Probably your copy of NDK is broken.
    Call Stack (most recent call first):
      /usr/local/Cellar/cmake/3.10.1/share/cmake/Modules/CMakeDetermineSystem.cmake:91 (include)
      CMakeLists.txt:2 (project)
    
    
    CMake Deprecation Warning at /usr/local/Cellar/cmake/3.10.1/share/cmake/Modules/CMakeForceCompiler.cmake:69 (message):
      The CMAKE_FORCE_C_COMPILER macro is deprecated.  Instead just set
      CMAKE_C_COMPILER and allow CMake to identify the compiler.
    Call Stack (most recent call first):
      toolchain/android.toolchain.cmake:1128 (CMAKE_FORCE_C_COMPILER)
      /usr/local/Cellar/cmake/3.10.1/share/cmake/Modules/CMakeDetermineSystem.cmake:91 (include)
      CMakeLists.txt:2 (project)
    
    
    CMake Deprecation Warning at /usr/local/Cellar/cmake/3.10.1/share/cmake/Modules/CMakeForceCompiler.cmake:83 (message):
      The CMAKE_FORCE_CXX_COMPILER macro is deprecated.  Instead just set
      CMAKE_CXX_COMPILER and allow CMake to identify the compiler.
    Call Stack (most recent call first):
      toolchain/android.toolchain.cmake:1140 (CMAKE_FORCE_CXX_COMPILER)
      /usr/local/Cellar/cmake/3.10.1/share/cmake/Modules/CMakeDetermineSystem.cmake:91 (include)
      CMakeLists.txt:2 (project)
    
    
    -- Configuring incomplete, errors occurred!
    
    opened by HIPERCUBE 6
Owner
Andrey Kamaev
Andrey Kamaev
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