src/caffe/proto/caffe.pb.h:17:2: error: #error This file was generated by an older version of protoc which is #error This file was generated by an older version of protoc which is

src/caffe/proto/caffe.pb.h:17:2: error: #error This file was generated by an older version of protoc which is
 #error This file was generated by an older version of protoc which is


/src/caffe/proto/caffe.pb.h:17:2: error: #error This file was generated by an older version of protoc which is
 #error This file was generated by an older version of protoc which is
  ^~~~~
/src/caffe/proto/caffe.pb.h:18:2: error: #error incompatible with your Protocol Buffer headers. Please
 #error incompatible with your Protocol Buffer headers.  Please
  ^~~~~
/src/caffe/proto/caffe.pb.h:19:2: error: #error regenerate this file with a newer version of protoc.
 #error regenerate this file with a newer version of protoc.

很奇怪的一个问题，我电脑是之前可以编译这个caffe是没有问题的，但是拿同事那边的caffe过来一编译就出这个问题！
很纳闷，protobuf的问题。我电脑看了就一个protobuf啊，3.0.0的

然后弄了一会儿，还是根据这个报错提示来。然后发现：
/caffe/src/caffe/proto/caffe.pb.cc
/caffe/src/caffe/proto/caffe.pb.h
/caffe/src/caffe/proto/caffe.proto

这个src/caffe/proto文件夹下应该就一个文件，caffe.proto。其他两个文件是编译的时候生成的，但是make clean
这个命名并不能把它删掉！ 需要手动删除！这样才会重新编译生成，要不然就是用既有的。
所以这个报错提示还是很精确的，奈何为啥一开始没有仔细看看呢？