Configure CMakeLists.txt for locally installed Protocol Buffers - c++

Question

I downloaded the Protocol Buffers source from GitHub. I don't want to install it globally and just want to use it in my ROS package. I found cmake files here but not sure how to use them in my project.
Below is the content of my CMakeLists.txt:
cmake_minimum_required(VERSION 2.8.3)
project(local_protobuf_ros_example)
find_package(catkin REQUIRED COMPONENTS roscpp)
find_package(Protobuf REQUIRED)
catkin_package()
include_directories(include ${catkin_INCLUDE_DIRS} ${PROTOBUF_INCLUDE_DIRS})
add_library(addressbook_protobuf include/addressbook.pb.cc)
add_executable(main src/main.cpp)
target_link_libraries(main ${catkin_LIBRARIES} addressbook_protobuf ${PROTOBUF_LIBRARIES})
Below is the file structure of ROS Package:
├── CMakeLists.txt
├── include
│   ├── addressbook.pb.cc
│   ├── addressbook.pb.h
│   └── addressbook.proto
├── lib
│   ├── protobuf-3.5.0
│   │   ├── cmake
│   │   │   ├── CMakeLists.txt
│   │   │   ├── examples.cmake
│   │   │   ├── extract_includes.bat.in
│   │   │   ├── install.cmake
│   │   │   ├── libprotobuf.cmake
│   │   │   ├── libprotobuf-lite.cmake
│   │   │   ├── libprotoc.cmake
│   │   │   ├── protobuf-config.cmake.in
│   │   │   ├── protobuf-config-version.cmake.in
│   │   │   ├── protobuf-lite.pc.cmake
│   │   │   ├── protobuf-module.cmake.in
│   │   │   ├── protobuf-options.cmake
│   │   │   ├── protobuf.pc.cmake
│   │   │   ├── protoc.cmake
│   │   │   ├── README.md
│   │   │   └── tests.cmake
│   │   ├──SOME_FILES_ARE_NOT_BEING_SHOWN_HERE
│   └── protobuf-cpp-3.5.0.zip
├── package.xml
└── src
└── main.cpp
I want to know that how to configure above CMakeLists.txt so that it uses locally installed Protocol Buffers?

Answer 1

You can set CMAKE_MODULE_PATH when you configure your build directory to specify a custom location to search for packages. You are not required to modify your CMakeLists.txt, configure your build for example like this:
cmake -DCMAKE_MODULE_PATH=/path/to/protobuf/cmake/config /path/to/source