Error occurs when making caffe [ -Wunused-variable]

[Hiker01]

When I make caffe, I only got Warning [ -Wunused-variable]. But I got an error at last,how can i fix it up?

******************* Caffe Configuration Summary *******************
-- General:
-- Version : (Caffe doesn't declare its version in headers)
-- Git : unknown
-- System : Linux
-- C++ compiler : /usr/bin/c++
-- Release CXX flags : -O3 -DNDEBUG -fPIC -Wall -Wno-sign-compare -Wno-uninitialized
-- Debug CXX flags : -g -fPIC -Wall -Wno-sign-compare -Wno-uninitialized
-- Build type : Release

-- BUILD_SHARED_LIBS : ON
-- BUILD_python : ON
-- BUILD_matlab : OFF
-- BUILD_docs : ON
-- CPU_ONLY : OFF

-- Dependencies:
-- BLAS : Yes (Atlas)
-- Boost : Yes (ver. 1.54)
-- glog : Yes
-- gflags : Yes
-- protobuf : Yes (ver. 2.5.0)
-- lmdb : Yes (ver. 0.9.10)
-- Snappy : Yes (ver. 1.1.0)
-- LevelDB : Yes (ver. 1.15)
-- OpenCV : Yes (ver. 2.4.13)
-- CUDA : Yes (ver. 7.5)

-- NVIDIA CUDA:
-- Target GPU(s) : Auto
-- GPU arch(s) : sm_35
-- cuDNN : Yes

-- Documentaion:
-- Doxygen : No
-- config_file :

-- Install:
-- Install path : /root/Optical-Flow-Guided-Feature-master/lib/caffe-action/build/install

-- Configuring done
-- Generating done
CMake Warning:
Manually-specified variables were not used by the project:

CUDA_USE_STATIC_CUDA_RUNTIME

-- Build files have been written to: /root/Optical-Flow-Guided-Feature-master/lib/caffe-action/build
[ 0%] Running C++/Python protocol buffer compiler on /root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/proto/caffe.proto
Scanning dependencies of target proto
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Linking CXX static library ../../lib/libproto.a
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Building NVCC (Device) object src/caffe/CMakeFiles/cuda_compile.dir/layers/./cuda_compile_generated_batch_reduction_layer.cu.o
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/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/flow_warp_layer.cu(365): warning: variable "whc_size" was declared but never referenced

/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/flow_warp_layer.cu(469): warning: variable "whc_size" was declared but never referenced

/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/edge_layer.cu(30): warning: variable "range" was declared but never referenced

/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/flow_warp_layer.cu(365): warning: variable "whc_size" was declared but never referenced

/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/flow_warp_layer.cu(469): warning: variable "whc_size" was declared but never referenced

/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/flow_warp_layer.cu: In instantiation of 'void caffe::FlowWarpLayer::Forward_gpu(const std::vector<caffe::Blob>&, const std::vector<caffe::Blob>&) [with Dtype = float]':
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/flow_warp_layer.cu:574:136: required from here
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/flow_warp_layer.cu:373:48: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
float nanf = (reinterpret_cast<float>(&nan));
^
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/flow_warp_layer.cu: In instantiation of 'void caffe::FlowWarpLayer::Forward_gpu(const std::vector<caffe::Blob>&, const std::vector<caffe::Blob>&) [with Dtype = double]':
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/flow_warp_layer.cu:574:276: required from here
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/flow_warp_layer.cu:373:48: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
Scanning dependencies of target caffe
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[ 89%] make[2]: *** No rule to make target /usr/local/cuda-7.5/lib64/libcudnn.so', needed by lib/libcaffe.so'. Stop.
make[2]: *** Waiting for unfinished jobs....
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/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/data_transformer.cpp: In instantiation of 'void caffe::DataTransformer::Transform(const caffe::Datum&, caffe::Blob) [with Dtype = float]':
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/data_transformer.cpp:1568:2: required from here
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/data_transformer.cpp:1094:13: warning: unused variable 'datum_channels' [-Wunused-variable]
const int datum_channels = datum.channels();
^
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/data_transformer.cpp:1099:13: warning: unused variable 'channels' [-Wunused-variable]
const int channels = transformed_blob->channels();
^
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/data_transformer.cpp: In instantiation of 'void caffe::DataTransformer::Transform(const caffe::Datum&, caffe::Blob) [with Dtype = double]':
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/data_transformer.cpp:1568:2: required from here
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/data_transformer.cpp:1094:13: warning: unused variable 'datum_channels' [-Wunused-variable]
const int datum_channels = datum.channels();
^
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/data_transformer.cpp:1099:13: warning: unused variable 'channels' [-Wunused-variable]
const int channels = transformed_blob->channels();
^
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/edge_layer.cpp: In instantiation of 'void caffe::EdgeLayer::LayerSetUp(const std::vector<caffe::Blob>&, const std::vector<caffe::Blob>&) [with Dtype = float]':
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/edge_layer.cpp:215:2: required from here
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/edge_layer.cpp:131:13: warning: unused variable 'batch_size' [-Wunused-variable]
const int batch_size = bottom[0]->num();
^
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/edge_layer.cpp: In instantiation of 'void caffe::EdgeLayer::Forward_cpu(const std::vector<caffe::Blob>&, const std::vector<caffe::Blob>&) [with Dtype = float]':
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/edge_layer.cpp:215:2: required from here
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/edge_layer.cpp:175:10: warning: unused variable 'weights' [-Wunused-variable]
Dtype* weights = this->layer->blobs()[0]->mutable_cpu_data();
^
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/edge_layer.cpp:176:13: warning: unused variable 'num_channels' [-Wunused-variable]
const int num_channels = bottom[0]->channels();
^
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/edge_layer.cpp: In instantiation of 'void caffe::EdgeLayer::LayerSetUp(const std::vector<caffe::Blob>&, const std::vector<caffe::Blob>&) [with Dtype = double]':
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/edge_layer.cpp:215:2: required from here
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/edge_layer.cpp:131:13: warning: unused variable 'batch_size' [-Wunused-variable]
const int batch_size = bottom[0]->num();
^
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/edge_layer.cpp: In instantiation of 'void caffe::EdgeLayer::Forward_cpu(const std::vector<caffe::Blob>&, const std::vector<caffe::Blob>&) [with Dtype = double]':
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/edge_layer.cpp:215:2: required from here
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/edge_layer.cpp:175:10: warning: unused variable 'weights' [-Wunused-variable]
Dtype* weights = this->layer->blobs()[0]->mutable_cpu_data();
^
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/edge_layer.cpp:176:13: warning: unused variable 'num_channels' [-Wunused-variable]
const int num_channels = bottom[0]->channels();
^
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/flow_warp_layer.cpp: In instantiation of 'void caffe::FlowWarpLayer::Backward_cpu(const std::vector<caffe::Blob>&, const std::vector&, const std::vector<caffe::Blob>&) [with Dtype = float]':
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/flow_warp_layer.cpp:259:2: required from here
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/flow_warp_layer.cpp:130:16: warning: unused variable 'warped_data' [-Wunused-variable]
const Dtype* warped_data = top[0]->cpu_data(); // dest
^
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/flow_warp_layer.cpp: In instantiation of 'void caffe::FlowWarpLayer::Backward_cpu(const std::vector<caffe::Blob>&, const std::vector&, const std::vector<caffe::Blob>&) [with Dtype = double]':
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/flow_warp_layer.cpp:259:2: required from here
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/layers/flow_warp_layer.cpp:130:16: warning: unused variable 'warped_data' [-Wunused-variable]
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/solver.cpp: In instantiation of 'void caffe::AdamSolver::AdamPreSolve() [with Dtype = float]':
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/solver.cpp:1097:1: required from here
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/solver.cpp:974:28: warning: unused variable 'net_params_lr' [-Wunused-variable]
const vector& net_params_lr = this->net_->params_lr();
^
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/solver.cpp: In instantiation of 'void caffe::AdamSolver::AdamPreSolve() [with Dtype = double]':
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/solver.cpp:1097:1: required from here
/root/Optical-Flow-Guided-Feature-master/lib/caffe-action/src/caffe/solver.cpp:974:28: warning: unused variable 'net_params_lr' [-Wunused-variable]
make[1]: *** [src/caffe/CMakeFiles/caffe.dir/all] Error 2
make: *** [all] Error 2