compile libcaffe-jni.so issue

[lei9wang]

i replace caffe with myself caffe, then ./tools/build_android.sh
There is link error like this:
canning dependencies of target caffe
[ 57%] Linking CXX shared library ../../lib/libcaffe.so
[ 57%] Built target caffe
Scanning dependencies of target caffe-jni
[ 71%] Building CXX object src/jni/CMakeFiles/caffe-jni.dir/caffe_jni.cpp.o
[ 85%] Building CXX object src/jni/CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o
[100%] Linking CXX shared library ../../lib/libcaffe-jni.so
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::predictImage(unsigned char const*, int, std::vector<float, std::allocator > const&, std::vector<float, std::allocator >&): error: undefined reference to 'caffe::CPUTimer::CPUTimer()'
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::predictImage(unsigned char const*, int, std::vector<float, std::allocator > const&, std::vector<float, std::allocator >&): error: undefined reference to 'caffe::CPUTimer::Start()'
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::predictImage(unsigned char const*, int, std::vector<float, std::allocator > const&, std::vector<float, std::allocator >&): error: undefined reference to 'caffe::Blob::mutable_cpu_data()'
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::predictImage(unsigned char const*, int, std::vector<float, std::allocator > const&, std::vector<float, std::allocator >&): error: undefined reference to 'caffe::Timer::~Timer()'
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::predictImage(unsigned char const*, int, std::vector<float, std::allocator > const&, std::vector<float, std::allocator >&): error: undefined reference to 'caffe::Net::Forward(float*)'
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::predictImage(unsigned char const*, int, std::vector<float, std::allocator > const&, std::vector<float, std::allocator >&): error: undefined reference to 'caffe::CPUTimer::Stop()'
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::predictImage(unsigned char const*, int, std::vector<float, std::allocator > const&, std::vector<float, std::allocator >&): error: undefined reference to 'vtable for caffe::CPUTimer'
/home/linux/android-ndk-r15c/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld: the vtable symbol may be undefined because the class is missing its key function (see go/missingkeymethod)
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::predictImage(unsigned char const*, int, std::vector<float, std::allocator > const&, std::vector<float, std::allocator >&): error: undefined reference to 'caffe::CPUTimer::MilliSeconds()'
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::predictImage(unsigned char const*, int, std::vector<float, std::allocator > const&, std::vector<float, std::allocator >&): error: undefined reference to 'caffe::Blob::cpu_data() const'
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::predictImage(unsigned char const*, int, std::vector<float, std::allocator > const&, std::vector<float, std::allocator >&): error: undefined reference to 'caffe::Timer::~Timer()'
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::predictImage(unsigned char const*, int, std::vector<float, std::allocator > const&, std::vector<float, std::allocator >&): error: undefined reference to 'vtable for caffe::CPUTimer'
/home/linux/android-ndk-r15c/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld: the vtable symbol may be undefined because the class is missing its key function (see go/missingkeymethod)
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::CaffeMobile(std::string const&, std::string const&): error: undefined reference to 'caffe::Caffe::Get()'
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::CaffeMobile(std::string const&, std::string const&): error: undefined reference to 'caffe::CPUTimer::CPUTimer()'
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::CaffeMobile(std::string const&, std::string const&): error: undefined reference to 'caffe::CPUTimer::Start()'
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::CaffeMobile(std::string const&, std::string const&): error: undefined reference to 'caffe::Net::Net(std::string const&, caffe::Phase, int, std::vector<std::string, std::allocatorstd::string > const*)'
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::CaffeMobile(std::string const&, std::string const&): error: undefined reference to 'caffe::Net::CopyTrainedLayersFrom(std::string)'
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::CaffeMobile(std::string const&, std::string const&): error: undefined reference to 'caffe::CPUTimer::Stop()'
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::CaffeMobile(std::string const&, std::string const&): error: undefined reference to 'caffe::CPUTimer::MilliSeconds()'
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::CaffeMobile(std::string const&, std::string const&): error: undefined reference to 'caffe::Timer::~Timer()'
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::CaffeMobile(std::string const&, std::string const&): error: undefined reference to 'vtable for caffe::CPUTimer'
/home/linux/android-ndk-r15c/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld: the vtable symbol may be undefined because the class is missing its key function (see go/missingkeymethod)
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::CaffeMobile(std::string const&, std::string const&): error: undefined reference to 'caffe::Timer::~Timer()'
CMakeFiles/caffe-jni.dir/caffe_mobile.cpp.o:caffe_mobile.cpp:function caffe::CaffeMobile::CaffeMobile(std::string const&, std::string const&): error: undefined reference to 'vtable for caffe::CPUTimer'
/home/linux/android-ndk-r15c/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld: the vtable symbol may be undefined because the class is missing its key function (see go/missingkeymethod)
collect2: error: ld returned 1 exit status
src/jni/CMakeFiles/caffe-jni.dir/build.make:124: recipe for target 'lib/libcaffe-jni.so' failed
make[2]: *** [lib/libcaffe-jni.so] Error 1
CMakeFiles/Makefile2:212: recipe for target 'src/jni/CMakeFiles/caffe-jni.dir/all' failed
make[1]: *** [src/jni/CMakeFiles/caffe-jni.dir/all] Error 2
Makefile:129: recipe for target 'all' failed
make: *** [all] Error 2

if compile static library libcaffe-jni, it is okay.
@solrex , could you give guide about this issue?

[Wenbo Yang]

@lei9wang Sorry, you cannot do that. The caffe source code in this project is modified, a lot. You can only add some self-defined layers, and fix the compiling errors yourself.