这个框架需要安装caffe框架？

[wangyarui]

未定义的引用？当make的时候，出现如下报错？难道这个框架需要安装caffe框架？
[ 95%] Building CXX object tools/caffe/CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o
[ 96%] Linking CXX executable caffe2ncnn
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::WindowDataParameter::~WindowDataParameter()’中：
caffe.pb.cc:(.text+0x372e)：对‘google::protobuf::internal::empty_string_’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::WindowDataParameter::~WindowDataParameter()’中：
caffe.pb.cc:(.text+0x397e)：对‘google::protobuf::internal::empty_string_’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::PythonParameter::~PythonParameter()’中：
caffe.pb.cc:(.text+0x453e)：对‘google::protobuf::internal::empty_string_’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::PythonParameter::~PythonParameter()’中：
caffe.pb.cc:(.text+0x470e)：对‘google::protobuf::internal::empty_string_’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::InfogainLossParameter::~InfogainLossParameter()’中：
caffe.pb.cc:(.text+0x53fa)：对‘google::protobuf::internal::empty_string_’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o:caffe.pb.cc:(.text+0x54da): 跟着更多未定义的参考到 google::protobuf::internal::empty_string_
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::Datum::SerializeWithCachedSizes(google::protobuf::io::CodedOutputStream*) const’中：
caffe.pb.cc:(.text+0x1612e)：对‘google::protobuf::internal::WireFormatLite::WriteBytesMaybeAliased(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::WindowDataParameter::SerializeWithCachedSizesToArray(unsigned char*) const’中：
caffe.pb.cc:(.text+0x161ac)：对‘google::protobuf::io::CodedOutputStream::WriteStringWithSizeToArray(std::string const&, unsigned char*)’未定义的引用
caffe.pb.cc:(.text+0x161d9)：对‘google::protobuf::io::CodedOutputStream::WriteStringWithSizeToArray(std::string const&, unsigned char*)’未定义的引用
caffe.pb.cc:(.text+0x162a3)：对‘google::protobuf::io::CodedOutputStream::WriteStringWithSizeToArray(std::string const&, unsigned char*)’未定义的引用
caffe.pb.cc:(.text+0x162d1)：对‘google::protobuf::io::CodedOutputStream::WriteStringWithSizeToArray(std::string const&, unsigned char*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::PythonParameter::SerializeWithCachedSizesToArray(unsigned char*) const’中：
caffe.pb.cc:(.text+0x16368)：对‘google::protobuf::io::CodedOutputStream::WriteStringWithSizeToArray(std::string const&, unsigned char*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o:caffe.pb.cc:(.text+0x16383): 跟着更多未定义的参考到 google::protobuf::io::CodedOutputStream::WriteStringWithSizeToArray(std::string const&, unsigned char*)
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::WindowDataParameter::Clear()’中：
caffe.pb.cc:(.text+0x17df1)：对‘google::protobuf::internal::empty_string_’未定义的引用
caffe.pb.cc:(.text+0x17e22)：对‘google::protobuf::internal::empty_string_’未定义的引用
caffe.pb.cc:(.text+0x17ea0)：对‘google::protobuf::internal::empty_string_’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::InfogainLossParameter::MergeFrom(google::protobuf::Message const&)’中：
caffe.pb.cc:(.text+0x17f7b)：对‘google::protobuf::internal::empty_string_’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::V0LayerParameter::Clear()’中：
caffe.pb.cc:(.text+0x181f6)：对‘google::protobuf::internal::empty_string_’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o:caffe.pb.cc:(.text+0x18403): 跟着更多未定义的参考到 google::protobuf::internal::empty_string_
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::PythonParameter::SerializeWithCachedSizes(google::protobuf::io::CodedOutputStream*) const’中：
caffe.pb.cc:(.text+0x1889d)：对‘google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
caffe.pb.cc:(.text+0x188b5)：对‘google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
caffe.pb.cc:(.text+0x188cd)：对‘google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::InfogainLossParameter::SerializeWithCachedSizes(google::protobuf::io::CodedOutputStream*) const’中：
caffe.pb.cc:(.text+0x1895d)：对‘google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::HDF5OutputParameter::SerializeWithCachedSizes(google::protobuf::io::CodedOutputStream*) const’中：
caffe.pb.cc:(.text+0x189cd)：对‘google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o:caffe.pb.cc:(.text+0x18a84): 跟着更多未定义的参考到 google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(int, std::string const&, google::protobuf::io::CodedOutputStream*)
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::NetState::~NetState()’中：
caffe.pb.cc:(.text+0x1916a)：对‘google::protobuf::internal::StringTypeHandlerBase::Delete(std::string*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::NetState::~NetState()’中：
caffe.pb.cc:(.text+0x191fa)：对‘google::protobuf::internal::StringTypeHandlerBase::Delete(std::string*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::V1LayerParameter::SerializeWithCachedSizes(google::protobuf::io::CodedOutputStream*) const’中：
caffe.pb.cc:(.text+0x192b1)：对‘google::protobuf::internal::WireFormatLite::WriteString(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
caffe.pb.cc:(.text+0x192e1)：对‘google::protobuf::internal::WireFormatLite::WriteString(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
caffe.pb.cc:(.text+0x198c4)：对‘google::protobuf::internal::WireFormatLite::WriteString(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
caffe.pb.cc:(.text+0x1996d)：对‘google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::LayerParameter::SerializeWithCachedSizes(google::protobuf::io::CodedOutputStream*) const’中：
caffe.pb.cc:(.text+0x19c41)：对‘google::protobuf::internal::WireFormatLite::WriteString(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
caffe.pb.cc:(.text+0x19c71)：对‘google::protobuf::internal::WireFormatLite::WriteString(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
caffe.pb.cc:(.text+0x1a5ad)：对‘google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
caffe.pb.cc:(.text+0x1a5cd)：对‘google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::NetStateRule::SerializeWithCachedSizes(google::protobuf::io::CodedOutputStream*) const’中：
caffe.pb.cc:(.text+0x1aa31)：对‘google::protobuf::internal::WireFormatLite::WriteString(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
caffe.pb.cc:(.text+0x1aa61)：对‘google::protobuf::internal::WireFormatLite::WriteString(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::NetState::SerializeWithCachedSizes(google::protobuf::io::CodedOutputStream*) const’中：
caffe.pb.cc:(.text+0x1ab21)：对‘google::protobuf::internal::WireFormatLite::WriteString(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::NetParameter::SerializeWithCachedSizes(google::protobuf::io::CodedOutputStream*) const’中：
caffe.pb.cc:(.text+0x1ac01)：对‘google::protobuf::internal::WireFormatLite::WriteString(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
caffe.pb.cc:(.text+0x1ad2d)：对‘google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::SolverParameter::SerializeWithCachedSizes(google::protobuf::io::CodedOutputStream*) const’中：
caffe.pb.cc:(.text+0x1adb1)：对‘google::protobuf::internal::WireFormatLite::WriteString(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
caffe.pb.cc:(.text+0x1b095)：对‘google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
caffe.pb.cc:(.text+0x1b158)：对‘google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
caffe.pb.cc:(.text+0x1b238)：对‘google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
caffe.pb.cc:(.text+0x1b2d5)：对‘google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
caffe.pb.cc:(.text+0x1b2f0)：对‘google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(int, std::string const&, google::protobuf::io::CodedOutputStream*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o:caffe.pb.cc:(.text+0x1b440): 跟着更多未定义的参考到 google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(int, std::string const&, google::protobuf::io::CodedOutputStream*)
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::PythonParameter::MergePartialFromCodedStream(google::protobuf::io::CodedInputStream*)’中：
caffe.pb.cc:(.text+0x1df45)：对‘google::protobuf::internal::empty_string_’未定义的引用
caffe.pb.cc:(.text+0x1df61)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
caffe.pb.cc:(.text+0x1dfb4)：对‘google::protobuf::internal::empty_string_’未定义的引用
caffe.pb.cc:(.text+0x1dfd0)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
caffe.pb.cc:(.text+0x1e044)：对‘google::protobuf::internal::empty_string_’未定义的引用
caffe.pb.cc:(.text+0x1e05c)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::InfogainLossParameter::MergePartialFromCodedStream(google::protobuf::io::CodedInputStream*)’中：
caffe.pb.cc:(.text+0x1e437)：对‘google::protobuf::internal::empty_string_’未定义的引用
caffe.pb.cc:(.text+0x1e44f)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::HDF5OutputParameter::MergePartialFromCodedStream(google::protobuf::io::CodedInputStream*)’中：
caffe.pb.cc:(.text+0x1e567)：对‘google::protobuf::internal::empty_string_’未定义的引用
caffe.pb.cc:(.text+0x1e57f)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘void google::protobuf::internal::RepeatedPtrFieldBase::Destroy<google::protobuf::RepeatedPtrFieldstd::string::TypeHandler>() [clone .isra.1280]’中：
caffe.pb.cc:(.text+0x1e9d1)：对‘google::protobuf::internal::StringTypeHandlerBase::Delete(std::string*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::NetStateRule::~NetStateRule()’中：
caffe.pb.cc:(.text+0x1eb9a)：对‘google::protobuf::internal::StringTypeHandlerBase::Delete(std::string*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::NetStateRule::~NetStateRule()’中：
caffe.pb.cc:(.text+0x1ec3a)：对‘google::protobuf::internal::StringTypeHandlerBase::Delete(std::string*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::V1LayerParameter::Clear()’中：
caffe.pb.cc:(.text+0x1f478)：对‘google::protobuf::internal::empty_string_’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::LayerParameter::Clear()’中：
caffe.pb.cc:(.text+0x1f4eb)：对‘google::protobuf::internal::empty_string_’未定义的引用
caffe.pb.cc:(.text+0x1fac6)：对‘google::protobuf::internal::empty_string_’未定义的引用
caffe.pb.cc:(.text+0x1fdc3)：对‘google::protobuf::internal::empty_string_’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::SolverParameter::Clear()’中：
caffe.pb.cc:(.text+0x1fe45)：对‘google::protobuf::internal::empty_string_’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o:caffe.pb.cc:(.text+0x1fe88): 跟着更多未定义的参考到 google::protobuf::internal::empty_string_
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘void google::protobuf::internal::RepeatedPtrFieldBase::Destroy<google::protobuf::RepeatedPtrFieldcaffe::NetState::TypeHandler>() [clone .isra.1323]’中：
caffe.pb.cc:(.text+0x20d02)：对‘google::protobuf::internal::StringTypeHandlerBase::Delete(std::string*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::SolverParameter::New() const’中：
caffe.pb.cc:(.text+0x20edb)：对‘google::protobuf::internal::empty_string_’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘void google::protobuf::internal::RepeatedPtrFieldBase::Destroy<google::protobuf::RepeatedPtrFieldcaffe::ParamSpec::TypeHandler>() [clone .isra.1324]’中：
caffe.pb.cc:(.text+0x210f3)：对‘google::protobuf::internal::empty_string_’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘void google::protobuf::internal::RepeatedPtrFieldBase::Destroy<google::protobuf::RepeatedPtrFieldcaffe::NetStateRule::TypeHandler>() [clone .isra.1325]’中：
caffe.pb.cc:(.text+0x21291)：对‘google::protobuf::internal::StringTypeHandlerBase::Delete(std::string*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::HDF5DataParameter::MergePartialFromCodedStream(google::protobuf::io::CodedInputStream*)’中：
caffe.pb.cc:(.text+0x230b4)：对‘google::protobuf::internal::empty_string_’未定义的引用
caffe.pb.cc:(.text+0x230cd)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::ParamSpec::MergePartialFromCodedStream(google::protobuf::io::CodedInputStream*)’中：
caffe.pb.cc:(.text+0x23ddd)：对‘google::protobuf::internal::empty_string_’未定义的引用
caffe.pb.cc:(.text+0x23df6)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::NetStateRule::MergePartialFromCodedStream(google::protobuf::io::CodedInputStream*)’中：
caffe.pb.cc:(.text+0x240af)：对‘google::protobuf::internal::StringTypeHandlerBase::New()’未定义的引用
caffe.pb.cc:(.text+0x240d2)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
caffe.pb.cc:(.text+0x2411b)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
caffe.pb.cc:(.text+0x24230)：对‘google::protobuf::internal::StringTypeHandlerBase::New()’未定义的引用
caffe.pb.cc:(.text+0x24253)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::NetState::MergePartialFromCodedStream(google::protobuf::io::CodedInputStream*)’中：
caffe.pb.cc:(.text+0x244ee)：对‘google::protobuf::internal::StringTypeHandlerBase::New()’未定义的引用
caffe.pb.cc:(.text+0x2450f)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
caffe.pb.cc:(.text+0x24556)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::WindowDataParameter::MergePartialFromCodedStream(google::protobuf::io::CodedInputStream*)’中：
caffe.pb.cc:(.text+0x24e2c)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
caffe.pb.cc:(.text+0x250d4)：对‘google::protobuf::internal::empty_string_’未定义的引用
caffe.pb.cc:(.text+0x250f0)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
caffe.pb.cc:(.text+0x25189)：对‘google::protobuf::internal::empty_string_’未定义的引用
caffe.pb.cc:(.text+0x251a7)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
caffe.pb.cc:(.text+0x251e8)：对‘google::protobuf::internal::empty_string_’未定义的引用
caffe.pb.cc:(.text+0x25206)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::ImageDataParameter::MergePartialFromCodedStream(google::protobuf::io::CodedInputStream*)’中：
caffe.pb.cc:(.text+0x260a4)：对‘google::protobuf::internal::empty_string_’未定义的引用
caffe.pb.cc:(.text+0x260bd)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
caffe.pb.cc:(.text+0x2618f)：对‘google::protobuf::internal::empty_string_’未定义的引用
caffe.pb.cc:(.text+0x261aa)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
caffe.pb.cc:(.text+0x2622e)：对‘google::protobuf::internal::empty_string_’未定义的引用
caffe.pb.cc:(.text+0x26249)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::DataParameter::MergePartialFromCodedStream(google::protobuf::io::CodedInputStream*)’中：
caffe.pb.cc:(.text+0x26d2f)：对‘google::protobuf::internal::empty_string_’未定义的引用
caffe.pb.cc:(.text+0x26d4a)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
caffe.pb.cc:(.text+0x26d8c)：对‘google::protobuf::internal::empty_string_’未定义的引用
caffe.pb.cc:(.text+0x26da5)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::FillerParameter::MergePartialFromCodedStream(google::protobuf::io::CodedInputStream*)’中：
caffe.pb.cc:(.text+0x2727b)：对‘google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::string*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::V0LayerParameter::SerializeWithCachedSizesToArray(unsigned char*) const’中：
caffe.pb.cc:(.text+0x27c05)：对‘google::protobuf::io::CodedOutputStream::WriteStringWithSizeToArray(std::string const&, unsigned char*)’未定义的引用
caffe.pb.cc:(.text+0x27c1d)：对‘google::protobuf::io::CodedOutputStream::WriteStringWithSizeToArray(std::string const&, unsigned char*)’未定义的引用
caffe.pb.cc:(.text+0x27dca)：对‘google::protobuf::io::CodedOutputStream::WriteStringWithSizeToArray(std::string const&, unsigned char*)’未定义的引用
caffe.pb.cc:(.text+0x27e05)：对‘google::protobuf::io::CodedOutputStream::WriteStringWithSizeToArray(std::string const&, unsigned char*)’未定义的引用
caffe.pb.cc:(.text+0x28035)：对‘google::protobuf::io::CodedOutputStream::WriteStringWithSizeToArray(std::string const&, unsigned char*)’未定义的引用
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o:caffe.pb.cc:(.text+0x2836f): 跟着更多未定义的参考到 google::protobuf::io::CodedOutputStream::WriteStringWithSizeToArray(std::string const&, unsigned char*)
CMakeFiles/caffe2ncnn.dir/caffe.pb.cc.o：在函数‘caffe::Datum::Datum()’中：
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collect2: error: ld returned 1 exit status
tools/caffe/CMakeFiles/caffe2ncnn.dir/build.make:129: recipe for target 'tools/caffe/caffe2ncnn' failed
make[2]: *** [tools/caffe/caffe2ncnn] Error 1
CMakeFiles/Makefile2:200: recipe for target 'tools/caffe/CMakeFiles/caffe2ncnn.dir/all' failed
make[1]: *** [tools/caffe/CMakeFiles/caffe2ncnn.dir/all] Error 2
Makefile:127: recipe for target 'all' failed
make: *** [all] Error 2

[nihui]

主库不依赖任何东西
caffe转换工具不需要 caffe，但需要 protobuf

[qinghua2016]

I also get this error, how to solve it?