Revert "third_party/protobuf: Update to HEAD (f52e188fe4)"

third_party/protobuf/examples/CMakeLists.txt

-# Minimum CMake required
-cmake_minimum_required(VERSION 2.8.12)
-
-# Project
-project(protobuf-examples)
-
-# Find required protobuf package
-find_package(protobuf CONFIG REQUIRED)
-
-if(protobuf_VERBOSE)
-  message(STATUS "Using Protocol Buffers ${Protobuf_VERSION}")
-endif()
-
-set(CMAKE_INCLUDE_CURRENT_DIR TRUE)
-
-# http://www.cmake.org/Wiki/CMake_FAQ#How_can_I_build_my_MSVC_application_with_a_static_runtime.3F
-if(MSVC AND protobuf_MSVC_STATIC_RUNTIME)
-  foreach(flag_var
-      CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE
-      CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
-    if(${flag_var} MATCHES "/MD")
-      string(REGEX REPLACE "/MD" "/MT" ${flag_var} "${${flag_var}}")
-    endif(${flag_var} MATCHES "/MD")
-  endforeach()
-endif()
-
-foreach(example add_person list_people)
-  set(${example}_SRCS ${example}.cc)
-  set(${example}_PROTOS addressbook.proto)
-
-  #Code Generation
-  if(protobuf_MODULE_COMPATIBLE) #Legacy Support
-    protobuf_generate_cpp(${example}_PROTO_SRCS ${example}_PROTO_HDRS ${${example}_PROTOS})
-    list(APPEND ${example}_SRCS ${${example}_PROTO_SRCS} ${${example}_PROTO_HDRS})
-  else()
-
-    foreach(proto_file ${${example}_PROTOS})
-      get_filename_component(proto_file_abs ${proto_file} ABSOLUTE)
-      get_filename_component(basename ${proto_file} NAME_WE)
-      set(generated_files ${basename}.pb.cc ${basename}.pb.h)
-      list(APPEND ${example}_SRCS ${generated_files})
-
-      add_custom_command(
-        OUTPUT ${generated_files}
-        COMMAND protobuf::protoc
-        ARGS --cpp_out ${CMAKE_CURRENT_BINARY_DIR} -I ${CMAKE_CURRENT_SOURCE_DIR} ${proto_file_abs}
-        COMMENT "Generating ${generated_files} from ${proto_file}"
-        VERBATIM
-      )
-    endforeach()
-  endif()
-
-  #Executable setup
-  set(executable_name ${example}_cpp)
-  add_executable(${executable_name} ${${example}_SRCS} ${${example}_PROTOS})
-  if(protobuf_MODULE_COMPATIBLE) #Legacy mode
-    target_include_directories(${executable_name} PUBLIC ${PROTOBUF_INCLUDE_DIRS})
-    target_link_libraries(${executable_name} ${PROTOBUF_LIBRARIES})
-  else()
-    target_link_libraries(${executable_name} protobuf::libprotobuf)
-  endif()
-
-endforeach()