Compiling program:image-classification-tflite for Android with Clang fails

[psyhtest]

I have a version of TFLite v1.13.1 built for Android:

$ ck install package --tags=lib,tflite,v1.13.1 --target_os=android24-arm64
...
$ ck show env --tags=lib,tflite,target-os-android24-arm64,compiled-by-llvm-android-ndk-3.8.256229
Env UID:         Target OS:      Bits: Name:                                      Version: Tags:

8caa447331219f22 android24-arm64    64 TensorFlow Lite API (from sources, static) 1.13.1   64bits,channel-stable,compiled-by-llvm-android-ndk,compiled-by-llvm-android-ndk-3.8.256229,host-os-linux-64,lib,lite,target-os-android24-arm64,tensorflow,tensorflow-lite,tensorflow-static,tflite,v1,v1.13,v1.13.1,vsrc,vstatic

As indicated by the tags, it's compiled with Clang 3.8 in Android NDK (r13b):

$ ck show env --tags=compiler,lang-cpp,llvm,target-os-android24-arm64,v3.8.256229
Env UID:         Target OS:      Bits: Name:                     Version:   Tags:

9d67d461bb5e069d android24-arm64    64 Android NDK LLVM compiler 3.8.256229 64bits,android,compiler,host-os-linux-64,lang-c,lang-cpp,llvm,ndk,target-os-android24-arm64,v3,v3.8,v3.8.256229

Cross-compiling program:image-classification-tflite for Android fails:

$ ck compile program:image-classification-tflite --target_os=android24-arm64 --deps.compiler=9d67d461bb5e069d
...
clang++ -c  -fPIE -pie -target aarch64-linux-android -gcc-toolchain /home/anton/data/android-ndk-r13b/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64 --sysroot=/home/anton/data/android-ndk-r13b
/platforms/android-24/arch-arm64   -I../ -DCK_HOST_OS_NAME2_LINUX=1 -DCK_HOST_OS_NAME_LINUX=1 -DCK_TARGET_OS_NAME2_ANDROID=1 -DCK_TARGET_OS_NAME_LINUX=1 -std=c++11 -DTF_LITE_1_13 -Wall -Wno-sign-compare -
I/home/anton/data/android-ndk-r13b/toolchains/llvm/prebuilt/linux-x86_64/include -I/home/anton/CK_TOOLS/lib-rtl-xopenme-0.3-android-ndk-4.9.x-android24-arm64/include -I/home/anton/data/android-ndk-r13b/so
urces/cxx-stl/gnu-libstdc++/include -I/home/anton/data/android-ndk-r13b/sources/cxx-stl/gnu-libstdc++/libs/arm64-v8a/include -I/home/anton/CK_TOOLS/lib-tflite-src-static-1.13.1-llvm-android-ndk-3.8.256229
-android24-arm64/src -I/home/anton/CK_TOOLS/lib-tflite-src-static-1.13.1-llvm-android-ndk-3.8.256229-android24-arm64/src/tensorflow/lite/tools/make/downloads/flatbuffers/include  ../classification.cpp  -o
 classification.o
clang++: warning: argument unused during compilation: '-pie'
In file included from ../classification.cpp:9:
../benchmark.h:14:10: fatal error: 'chrono' file not found
#include <chrono>
         ^
1 error generated.

Inspecting the environment reveals what the problem is:

$ ck cat env --tags=compiler,lang-cpp,llvm,target-os-android24-arm64,v3.8.256229 | grep INCLUDE
export CK_ENV_COMPILER_LLVM_INCLUDE=/home/anton/data/android-ndk-r13b/toolchains/llvm/prebuilt/linux-x86_64/include
export CK_ENV_LIB_STDCPP_INCLUDE=/home/anton/data/android-ndk-r13b/sources/cxx-stl/gnu-libstdc++/include
export CK_ENV_LIB_STDCPP_INCLUDE_EXTRA=/home/anton/data/android-ndk-r13b/sources/cxx-stl/gnu-libstdc++/libs/arm64-v8a/include
export CK_FLAG_PREFIX_INCLUDE=-I

The include paths should be prefixed by /home/anton/data/android-ndk-r13b/sources/cxx-stl/gnu-libstdc++/4.9. It looks that the ver variable here is now empty after some changes to support NDK >= 17:

       ndk_path=p5
       ver=ndk_gcc.get('ver', '')[:-2]
       abi=target_d.get('abi','')

       env[ep]=pi
       env[ep+'_BIN']=p1

       if ndk_iver>=17:

[psyhtest]

Compiling with Clang 6 from Android NDK r17b results in even more errors and warnings:

clang++ -c  -fPIE -pie -target aarch64-linux-android -gcc-toolchain /home/anton/data/android-ndk-r13b/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64 --sysroot=/home/anton/data/android-ndk-r13$
/platforms/android-24/arch-arm64 -I/home/anton/data/android-ndk-r17b/sysroot/usr/include -I/home/anton/data/android-ndk-r17b/sysroot/usr/include/aarch64-linux-android   -I../ -DCK_HOST_OS_NAME2_LINUX=1 -$
CK_HOST_OS_NAME_LINUX=1 -DCK_TARGET_OS_NAME2_ANDROID=1 -DCK_TARGET_OS_NAME_LINUX=1 -std=c++11 -DTF_LITE_1_13 -Wall -Wno-sign-compare -I/home/anton/data/android-ndk-r17b/toolchains/llvm/prebuilt/linux-x86$
64/include -I/home/anton/CK_TOOLS/lib-rtl-xopenme-0.3-android-ndk-4.9.x-android24-arm64/include -I/home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include -I  -I/home/anton/CK_TOOLS/lib-tflit
e-src-static-1.13.1-llvm-android-ndk-6.0.2-android24-arm64/src -I/home/anton/CK_TOOLS/lib-tflite-src-static-1.13.1-llvm-android-ndk-6.0.2-android24-arm64/src/tensorflow/lite/tools/make/downloads/flatbuffe
rs/include  ../classification.cpp  -o classification.o
clang++: warning: argument unused during compilation: '-pie' [-Wunused-command-line-argument]
In file included from ../classification.cpp:12:
In file included from /home/anton/CK_TOOLS/lib-tflite-src-static-1.13.1-llvm-android-ndk-6.0.2-android24-arm64/src/tensorflow/lite/kernels/register.h:19:
In file included from /home/anton/CK_TOOLS/lib-tflite-src-static-1.13.1-llvm-android-ndk-6.0.2-android24-arm64/src/tensorflow/lite/model.h:40:
In file included from /home/anton/CK_TOOLS/lib-tflite-src-static-1.13.1-llvm-android-ndk-6.0.2-android24-arm64/src/tensorflow/lite/interpreter.h:20:
In file included from /home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/complex:246:
/home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/cmath:313:9: error: no member named 'signbit' in the global namespace; did you mean 'sigwait'?
using ::signbit;
      ~~^
/home/anton/data/android-ndk-r17b/sysroot/usr/include/signal.h:129:5: note: 'sigwait' declared here
int sigwait(const sigset_t* __set, int* __signal);
    ^
In file included from ../classification.cpp:12:
In file included from /home/anton/CK_TOOLS/lib-tflite-src-static-1.13.1-llvm-android-ndk-6.0.2-android24-arm64/src/tensorflow/lite/kernels/register.h:19:
In file included from /home/anton/CK_TOOLS/lib-tflite-src-static-1.13.1-llvm-android-ndk-6.0.2-android24-arm64/src/tensorflow/lite/model.h:40:
In file included from /home/anton/CK_TOOLS/lib-tflite-src-static-1.13.1-llvm-android-ndk-6.0.2-android24-arm64/src/tensorflow/lite/interpreter.h:20:
In file included from /home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/complex:246:
/home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/cmath:314:9: error: no member named 'fpclassify' in the global namespace
using ::fpclassify;
      ~~^
/home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/cmath:315:9: error: no member named 'isfinite' in the global namespace; did you mean 'finite'?
using ::isfinite;
      ~~^
/home/anton/data/android-ndk-r17b/sysroot/usr/include/math.h:375:5: note: 'finite' declared here
int finite(double __x) __attribute_const__;
    ^
In file included from ../classification.cpp:12:
In file included from /home/anton/CK_TOOLS/lib-tflite-src-static-1.13.1-llvm-android-ndk-6.0.2-android24-arm64/src/tensorflow/lite/kernels/register.h:19:
In file included from /home/anton/CK_TOOLS/lib-tflite-src-static-1.13.1-llvm-android-ndk-6.0.2-android24-arm64/src/tensorflow/lite/model.h:40:
In file included from /home/anton/CK_TOOLS/lib-tflite-src-static-1.13.1-llvm-android-ndk-6.0.2-android24-arm64/src/tensorflow/lite/interpreter.h:20:
In file included from /home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/complex:246:
/home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/cmath:318:9: error: no member named 'isnormal' in the global namespace
using ::isnormal;
      ~~^
/home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/cmath:319:7: error: no member named 'isgreater' in the global namespace; did you mean '::std::greater'?
using ::isgreater;
      ^~
/home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/functional:720:29: note: '::std::greater' declared here
struct _LIBCPP_TEMPLATE_VIS greater : binary_function<_Tp, _Tp, bool>
                            ^
In file included from ../classification.cpp:12:
In file included from /home/anton/CK_TOOLS/lib-tflite-src-static-1.13.1-llvm-android-ndk-6.0.2-android24-arm64/src/tensorflow/lite/kernels/register.h:19:
In file included from /home/anton/CK_TOOLS/lib-tflite-src-static-1.13.1-llvm-android-ndk-6.0.2-android24-arm64/src/tensorflow/lite/model.h:40:
In file included from /home/anton/CK_TOOLS/lib-tflite-src-static-1.13.1-llvm-android-ndk-6.0.2-android24-arm64/src/tensorflow/lite/interpreter.h:20:
In file included from /home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/complex:246:
/home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/cmath:320:7: error: no member named 'isgreaterequal' in the global namespace; did you mean '::std::greater_equal'?
using ::isgreaterequal;
      ^~
/home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/functional:749:29: note: '::std::greater_equal' declared here
struct _LIBCPP_TEMPLATE_VIS greater_equal : binary_function<_Tp, _Tp, bool>
                            ^
In file included from ../classification.cpp:12:
In file included from /home/anton/CK_TOOLS/lib-tflite-src-static-1.13.1-llvm-android-ndk-6.0.2-android24-arm64/src/tensorflow/lite/kernels/register.h:19:
In file included from /home/anton/CK_TOOLS/lib-tflite-src-static-1.13.1-llvm-android-ndk-6.0.2-android24-arm64/src/tensorflow/lite/model.h:40:
In file included from /home/anton/CK_TOOLS/lib-tflite-src-static-1.13.1-llvm-android-ndk-6.0.2-android24-arm64/src/tensorflow/lite/interpreter.h:20:
In file included from /home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/complex:246:
/home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/cmath:321:9: error: no member named 'isless' in the global namespace
using ::isless;
      ~~^
/home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/cmath:322:9: error: no member named 'islessequal' in the global namespace
using ::islessequal;
      ~~^
/home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/cmath:323:9: error: no member named 'islessgreater' in the global namespace
using ::islessgreater;
      ~~^
/home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/cmath:324:9: error: no member named 'isunordered' in the global namespace
using ::isunordered;
      ~~^
/home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/cmath:325:9: error: no member named 'isunordered' in the global namespace
using ::isunordered;
      ~~^
In file included from ../classification.cpp:9:
In file included from ../benchmark.h:16:
In file included from /home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/fstream:169:
In file included from /home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/ostream:138:
In file included from /home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/ios:216:
In file included from /home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/__locale:15:
In file included from /home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/string:470:
In file included from /home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/string_view:169:
In file included from /home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/__string:56:
In file included from /home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/algorithm:643:
/home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/memory:2233:5: warning: delete called on 'CK::IBenchmark' that is abstract but has non-virtual destructor [-Wdelete-non-virtual-dtor]
    delete __ptr;
    ^
/home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include/memory:2546:7: note: in instantiation of member function 'std::__ndk1::default_delete<CK::IBenchmark>::operator()' requested here
      __ptr_.second()(__tmp);
      ^
../classification.cpp:73:19: note: in instantiation of member function 'std::__ndk1::unique_ptr<CK::IBenchmark, std::__ndk1::default_delete<CK::IBenchmark> >::reset' requested here
        benchmark.reset(new TFLiteBenchmark<float, InNormalize, OutCopy>(&settings, interpreter.get(), input_index));
                  ^
1 warning and 11 errors generated.
***************************************************************************************
Compilation time: 1.297 sec.; Object size: 0; Total binary size: 0; MD5: 

Warning: compilation failed!

$ ck show env --tags=compiler,lang-cpp,llvm,target-os-android24-arm64,v6 
Env UID:         Target OS:      Bits: Name:                     Version: Tags:

f58acb20767b3ac2 android24-arm64    64 Android NDK LLVM compiler 6.0.2    64bits,android,compiler,host-os-linux-64,lang-c,lang-cpp,llvm,ndk,target-os-android24-arm64,v6,v6.0,v6.0.2

$ ck show env --tags=lib,tflite,target-os-android24-arm64,compiled-by-llvm-android-ndk-6.0.2
Env UID:         Target OS:      Bits: Name:                                      Version: Tags:

b3f4a8483fba565c android24-arm64    64 TensorFlow Lite API (from sources, static) 1.13.1   64bits,channel-stable,compiled-by-llvm-android-ndk,compiled-by-llvm-android-ndk-6.0.2,host-os-linux-64,lib,lite,target-os-android24-arm64,tensorflow,tensorflow-lite,tensorflow-static,tflite,v1,v1.13,v1.13.1,vsrc,vstatic

$ ck cat env --tags=compiler,lang-cpp,llvm,target-os-android24-arm64,v6 | grep INCLUDE
export CK_ENV_COMPILER_LLVM_INCLUDE=/home/anton/data/android-ndk-r17b/toolchains/llvm/prebuilt/linux-x86_64/include
export CK_ENV_LIB_STDCPP_INCLUDE=/home/anton/data/android-ndk-r17b/sources/cxx-stl/llvm-libc++/include
export CK_ENV_LIB_STDCPP_INCLUDE_EXTRA=" "
export CK_FLAG_PREFIX_INCLUDE=-I

In fact, CK_ENV_COMPILER_LLVM_INCLUDE does not even exist:

$ l /home/anton/data/android-ndk-r17b/toolchains/llvm/prebuilt/linux-x86_64/include
ls: cannot access '/home/anton/data/android-ndk-r17b/toolchains/llvm/prebuilt/linux-x86_64/include': No such file or directory

$ find /home/anton/data/android-ndk-r17b/toolchains/llvm/prebuilt/linux-x86_64 -name include
/home/anton/data/android-ndk-r17b/toolchains/llvm/prebuilt/linux-x86_64/lib64/clang/6.0.2/include
anton@velociti:~/CK_REPOS/ck-tensorflow$ l /home/anton/data/android-ndk-r17b/toolchains/llvm/prebuilt/linux-x86_64/lib64/clang/6.0.2/include
__clang_cuda_builtin_vars.h           altivec.h         avx512erintrin.h      avx512vlintrin.h         emmintrin.h    intrin.h          msa.h           rtmintrin.h   stdint.h       x86intrin.h
__clang_cuda_cmath.h                  ammintrin.h       avx512fintrin.h       avx512vpopcntdqintrin.h  f16cintrin.h   inttypes.h        mwaitxintrin.h  s390intrin.h  stdnoreturn.h  xmmintrin.h
__clang_cuda_complex_builtins.h       arm64intr.h       avx512ifmaintrin.h    avxintrin.h              float.h        iso646.h          nmmintrin.h     sanitizer/    tbmintrin.h    xopintrin.h
__clang_cuda_intrinsics.h             arm_acle.h        avx512ifmavlintrin.h  bmi2intrin.h             fma4intrin.h   limits.h          omp.h           shaintrin.h   tgmath.h       xray/
__clang_cuda_math_forward_declares.h  arm_neon.h        avx512pfintrin.h      bmiintrin.h              fmaintrin.h    lwpintrin.h       opencl-c.h      smmintrin.h   tmmintrin.h    xsavecintrin.h
__clang_cuda_runtime_wrapper.h        armintr.h         avx512vbmiintrin.h    clflushoptintrin.h       fxsrintrin.h   lzcntintrin.h     pkuintrin.h     stdalign.h    unwind.h       xsaveintrin.h
__stddef_max_align_t.h                avx2intrin.h      avx512vbmivlintrin.h  clwbintrin.h             htmintrin.h    mm3dnow.h         pmmintrin.h     stdarg.h      vadefs.h       xsaveoptintrin.h
__wmmintrin_aes.h                     avx512bwintrin.h  avx512vlbwintrin.h    clzerointrin.h           htmxlintrin.h  mm_malloc.h       popcntintrin.h  stdatomic.h   varargs.h      xsavesintrin.h
__wmmintrin_pclmul.h                  avx512cdintrin.h  avx512vlcdintrin.h    cpuid.h                  ia32intrin.h   mmintrin.h        prfchwintrin.h  stdbool.h     vecintrin.h    xtestintrin.h
adxintrin.h                           avx512dqintrin.h  avx512vldqintrin.h    cuda_wrappers/           immintrin.h    module.modulemap  rdseedintrin.h  stddef.h      wmmintrin.h

[psyhtest]

Similar for NDK 13b:

$ l /home/anton/data/android-ndk-r13b/toolchains/llvm/prebuilt/linux-x86_64/include
ls: cannot access '/home/anton/data/android-ndk-r13b/toolchains/llvm/prebuilt/linux-x86_64/include': No such file or directory
$ find /home/anton/data/android-ndk-r13b/toolchains/llvm/prebuilt/linux-x86_64/ -name include
/home/anton/data/android-ndk-r13b/toolchains/llvm/prebuilt/linux-x86_64/lib64/clang/3.8/include
/home/anton/data/android-ndk-r13b/toolchains/llvm/prebuilt/linux-x86_64/lib64/clang/3.8.256229/include

[psyhtest]

For Clang 7 in NDK 18b:

$ ck show env --tags=compiler,lang-cpp,llvm,target-os-android28-arm64,v7               
Env UID:         Target OS:      Bits: Name:                     Version: Tags:

1c70f43a4910bf0c android28-arm64    64 Android NDK LLVM compiler 7.0.2    64bits,android,compiler,host-os-linux-64,lang-c,lang-cpp,llvm,ndk,target-os-android28-arm64,v7,v7.0,v7.0.2

it's even more complicated:

$ ck cat env --tags=compiler,lang-cpp,llvm,target-os-android28-arm64,v7 | grep INCLUDE
export CK_ENV_COMPILER_LLVM_INCLUDE=/home/anton/data/android-ndk-r18b/toolchains/llvm/prebuilt/linux-x86_64/include
export CK_ENV_LIB_STDCPP_INCLUDE=/home/anton/data/android-ndk-r18b/sources/cxx-stl/gnu-libstdc++/include
export CK_ENV_LIB_STDCPP_INCLUDE_EXTRA=/home/anton/data/android-ndk-r18b/sources/cxx-stl/gnu-libstdc++/libs/arm64-v8a/include
export CK_FLAG_PREFIX_INCLUDE=-I

$ l /home/anton/data/android-ndk-r18b/toolchains/llvm/prebuilt/linux-x86_64/include
ls: cannot access '/home/anton/data/android-ndk-r18b/toolchains/llvm/prebuilt/linux-x86_64/include': No such file or directory
$ find /home/anton/data/android-ndk-r18b/toolchains/llvm/prebuilt/linux-x86_64 -name include
/home/anton/data/android-ndk-r18b/toolchains/llvm/prebuilt/linux-x86_64/lib64/clang/7.0.2/include

$ l /home/anton/data/android-ndk-r18b/sources/cxx-stl/gnu-libstdc++/include
ls: cannot access '/home/anton/data/android-ndk-r18b/sources/cxx-stl/gnu-libstdc++/include': No such file or directory
$ l /home/anton/data/android-ndk-r18b/sources/cxx-stl/gnu-libstdc++/4.9/include
ls: cannot access '/home/anton/data/android-ndk-r18b/sources/cxx-stl/gnu-libstdc++/4.9/include': No such file or directory
$ l /home/anton/data/android-ndk-r18b/sources/cxx-stl/gnu-libstdc++            
ls: cannot access '/home/anton/data/android-ndk-r18b/sources/cxx-stl/gnu-libstdc++': No such file or directory

$ l /home/anton/data/android-ndk-r18b/sources/cxx-stl/gnu-libstdc++/libs/arm64-v8a/include
ls: cannot access '/home/anton/data/android-ndk-r18b/sources/cxx-stl/gnu-libstdc++/libs/arm64-v8a/include': No such file or directory
$ l /home/anton/data/android-ndk-r18b/sources/cxx-stl/gnu-libstdc++
ls: cannot access '/home/anton/data/android-ndk-r18b/sources/cxx-stl/gnu-libstdc++': No such file or directory

In fact, I cannot even build TFLite with NDK 18b:

$ ck install package --tags=lib,tflite,v1.13.1 --target_os=android28-arm64                           

  Package found: lib-tflite-1.13.1-src-static (bbde49998ab62431)

  -----------------------------------
  Resolving software dependencies ...

*** Dependency 1 = compiler (C++ compiler):

More than one environment found for "C++ compiler" with tags="compiler,lang-cpp" and setup={"target_os_bits": "64", "host_os_uoa": "linux-64", "target_os_uoa": "android28-arm64"}:

 0) Android NDK GCC compiler - vclang (64bits,android,compiler,gcc,host-os-linux-64,lang-c,lang-cpp,ndk,target-os-android28-arm64,v0 (fbe5a0899e47cda8))

 1) Android NDK LLVM compiler - v7.0.2 (64bits,android,compiler,host-os-linux-64,lang-c,lang-cpp,llvm,ndk,target-os-android28-arm64,v7,v7.0,v7.0.2 (1c70f43a4910bf0c))
                                       - Depends on "ndk" (env UOA=6e010ee496a928e8, tags="android,ndk,toolchain", version=2.27.0.20170315)


Select one of the options for "C++ compiler" with tags="compiler,lang-cpp" and setup={"target_os_bits": "64", "host_os_uoa": "linux-64", "target_os_uoa": "android28-arm64"} [ hit return for "0" ]: 1

results in tons of errors indicating again that the paths are not set up properly.

NB: I've learnt the hard way to avoid selecting the default when prompted. Recall no GCC is included in NDK from this revision on.