[CMake] No Member Found when use cmake construct protocol-buffers

[Yu Jing]

It is really sorry and I sent a html mail and it shows too ugly...
I have converted it to plain text and wish someone may give some suggestion.
 
------------------ Original ------------------
From:  "Yu Jing"<yu at argcv.com>;
Date:  Sun, Apr 19, 2015 06:53 PM
To:  "cmake"<cmake at cmake.org>;
Subject:  No Member Found when use cmake construct protocol-buffers
 
I wish to use proto and managed by cmake. While some error found and it seems

A sample project can be shown here(https://github.com/yuikns/cmake-proto)

The files are as follow

.
├── app1
│   ├── app1.cpp
│   └── app1.proto
├── CMakeLists.txt
├── common
│   ├── bar
│   │   ├── bar.proto
│   │   └── CMakeLists.txt
│   └── foo
│       ├── CMakeLists.txt
│       └── foo.proto
└── README.md
In common/bar/bar.proto, it defined as follow :

import "common/foo/foo.proto";

message bar_msg
{
  optional foo_msg foo = 1;
  optional string name = 2;
}

and I can use command :
$ protoc --cpp_out=build common/bar/bar.proto
$ protoc --cpp_out=build common/foo/foo.proto
in root directory.

while , I adjust several times and still can not make it work in cmake.

Here is the question in stackoverflow http://stackoverflow.com/questions/29720410/no-member-found-when-use-cmake-construct-proto/29727925 , and someone said there may something wrong of PROTOBUF_GENERATE_CPP.

May I know how can I adjust the project? Any help are appreciated .