为什么 CMake 不编译这个 protobuff class?

Why won't CMake compile this protobuff class?

因此,我尝试按照有关如何使用 Gazebo 的订阅服务添加主题的示例进行操作。 las,其中一个步骤是创建一个 protobuf 对象,不幸的是,当我 运行 CMake 时,我的 protobuff class 将无法编译。这是我目前所拥有的:

import "vector3d.proto";

message ModelVelResponse
{
  required AVelV angularVel = 1;
  required LVelV linearVel = 2;
}

message AVelV{
  repeated gazebo.msgs.Vector3d  angularVel = 1;
}

message LVelV{
  repeated gazebo.msgs.Vector3d  linearVel = 1;
}

这是我的 cmake 文件

cmake_minimum_required(VERSION 2.8 FATAL_ERROR)

find_package(Protobuf REQUIRED)

set(PROTOBUF_IMPORT_DIRS)
foreach(ITR ${GAZEBO_INCLUDE_DIRS})
  if(ITR MATCHES ".*gazebo-[0-9.]+$")
    set(PROTOBUF_IMPORT_DIRS "${ITR}/gazebo/msgs/proto")
  endif()
endforeach()

set (msgs
  velocity_message.proto
  ${PROTOBUF_IMPORT_DIRS}/vector3d.proto
  ${PROTOBUF_IMPORT_DIRS}/header.proto
  ${PROTOBUF_IMPORT_DIRS}/time.proto
)
PROTOBUF_GENERATE_CPP(PROTO_SRCS PROTO_HDRS ${msgs})
add_library(velocity_msgs SHARED ${PROTO_SRCS})
target_link_libraries(velocity_msgs ${PROTOBUF_LIBRARY})

find_package(Boost REQUIRED COMPONENTS system)
include_directories(${Boost_INCLUDE_DIRS})
link_directories(${Boost_LIBRARY_DIRS})

include (FindPkgConfig)
if (PKG_CONFIG_FOUND)
  pkg_check_modules(GAZEBO gazebo)
endif()
include_directories(${GAZEBO_INCLUDE_DIRS})
link_directories(${GAZEBO_LIBRARY_DIRS})

add_library(model_vel SHARED model_vel.cc)
target_link_libraries(model_vel ${GAZEBO_LIBRARIES} ${Boost_LIBRARIES})

知道我做错了什么吗?我的 protobuf 文件位于 "msgs" 子目录中,但是当我将应该生成 protobuf 库的代码移动到子目录中时,它仍然无法编译。它也没有解决任何错误。

更新:我的代码基于 this 教程。

我通过将 make 文件更改为这样解决了这个问题:

find_package(Protobuf REQUIRED)


set(PROTOBUF_IMPORT_DIRS)
foreach(ITR ${GAZEBO_INCLUDE_DIRS})
  if(ITR MATCHES ".*gazebo-[0-9.]+$")
    set(PROTOBUF_IMPORT_DIRS "${ITR}/gazebo/msgs/proto")
  endif()
endforeach()

    set (msgs
      velocity_message.proto
      ${PROTOBUF_IMPORT_DIRS}/vector3d.proto
      ${PROTOBUF_IMPORT_DIRS}/header.proto
      ${PROTOBUF_IMPORT_DIRS}/time.proto
    )
    PROTOBUF_GENERATE_CPP(PROTO_SRCS PROTO_HDRS ${msgs})
    add_library(velocity_msgs SHARED ${PROTO_SRCS})
    target_link_libraries(velocity_msgs ${PROTOBUF_LIBRARY})

我只需要将它添加为共享库。