C++ cpp文件和cu文件之间的LNK2005错误

我正在使用Visual Studio 2013为库构建dll。我有链接错误2005，我猜flatte_layer.cpp和flatte_layer.cu之间存在冲突。 错误是

1>flatten_layer.obj : error LNK2005: "char caffe::gInstantiationGuardFlattenLayer" (?gInstantiationGuardFlattenLayer@caffe@@3DA) already defined in flatten_layer.cu.obj
1>.\bin\caffe.dll : fatal error LNK1169: one or more multiply defined symbols found

此gInstantiationGuardFlattenLayer不在flatten_layer.cpp和flatten_layer.cu中。为什么会出现此链接器错误？我使用Visual Studio 2013进行编译

我的flatte_layer.cpp和flatte_layer.cu如下所示

展平_layer.cpp

#include <vector>

#include "caffe/layer.hpp"
#include "caffe/util/math_functions.hpp"
#include "caffe/vision_layers.hpp"

namespace caffe {

template <typename Dtype>
void FlattenLayer<Dtype>::Reshape(const vector<Blob<Dtype>*>& bottom,
      const vector<Blob<Dtype>*>& top) {
  const int start_axis = bottom[0]->CanonicalAxisIndex(
      this->layer_param_.flatten_param().axis());
  const int end_axis = bottom[0]->CanonicalAxisIndex(
      this->layer_param_.flatten_param().end_axis());
  vector<int> top_shape;
  for (int i = 0; i < start_axis; ++i) {
    top_shape.push_back(bottom[0]->shape(i));
  }
  const int flattened_dim = bottom[0]->count(start_axis, end_axis + 1);
  top_shape.push_back(flattened_dim);
  for (int i = end_axis + 1; i < bottom[0]->num_axes(); ++i) {
    top_shape.push_back(bottom[0]->shape(i));
  }
  top[0]->Reshape(top_shape);
  CHECK_EQ(top[0]->count(), bottom[0]->count());
}

template <typename Dtype>
void FlattenLayer<Dtype>::Forward_cpu(const vector<Blob<Dtype>*>& bottom,
      const vector<Blob<Dtype>*>& top) {
  top[0]->ShareData(*bottom[0]);
}

template <typename Dtype>
void FlattenLayer<Dtype>::Backward_cpu(const vector<Blob<Dtype>*>& top,
      const vector<bool>& propagate_down, const vector<Blob<Dtype>*>& bottom) {
  bottom[0]->ShareDiff(*top[0]);
}

INSTANTIATE_CLASS(FlattenLayer);
REGISTER_LAYER_CLASS(Flatten);

}  // namespace caffe

展平_layer.cu

#include <vector>

#include "caffe/layer.hpp"
#include "caffe/util/math_functions.hpp"
#include "caffe/vision_layers.hpp"

namespace caffe {

template <typename Dtype>
void FlattenLayer<Dtype>::Forward_gpu(const vector<Blob<Dtype>*>& bottom,
      vector<Blob<Dtype>*>* top) {
  (*top)[0]->ShareData(*bottom[0]);
}

template <typename Dtype>
void FlattenLayer<Dtype>::Backward_gpu(const vector<Blob<Dtype>*>& top,
      const vector<bool>& propagate_down, vector<Blob<Dtype>*>* bottom) {
  (*bottom)[0]->ShareDiff(*top[0]);
}

INSTANTIATE_CLASS(FlattenLayer);

}  // namespace caffe

---

我不使用caffe，但事实上您已经实例化了\u classflattlayer；在这两份文件中，我都有危险。是的，很好。我检查过了，通常这些.cu文件在代码末尾实例化了_LAYER_GPU_FUNCS。但是这个特定的flattlayer.cu文件在放入实例化的\u LAYER\u GPU\u FUNCSFlattenLayer时出错。因此，实例化层；在flattlayer.cu的末尾是否有。如果我注释掉实例化层；从flatte_layer.cpp，会有什么后果？我不能说，因为我对caffe/cuda了解不够。