Question

我试图编译一个使用ActiveMQ函数的项目（因此是库），但是我收到以下错误：

/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/libapr-1.a(proc_mutex.o): undefined reference to symbol 'sem_close@@GLIBC_2.2.5'

/lib/x86_64-linux-gnu/libpthread.so.0: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status

我必须说代码方面我没有疑问，它只是工作正常。我在格式化计算机后开始出现此错误，其中ActiveMQ所需的一些库可能已经消失。 libapr是其中之一，当然。

但是，我的计算机上安装了这个库。当我找到它时，我可以将其视为w：

/usr/lib/libapr-1.a
/usr/lib/x86_64-linux-gnu/libapr-1.a
/usr/local/apr/lib/libapr-1.a

所以它就在那里。此外，在我的CMakeLists.txt文件中，我将其称为：

set(ACTIVEMQ_CPP "/usr/local/lib/libactivemq-cpp.so")
set(ACTIVEMQ_INCLUDE_DIR "/usr/local/include/activemq-cpp-3.8.4/")

set(LIBAPR_LIB "/usr/lib/libapr-1.a")
set(LIBAPR_INCLUDE_DIR "/usr/include/apr-1")

所以我不知道导致错误的原因。我到处都看着，但仍然没有答案。

有什么想法吗？

P.S：我的完整CMakeLists.txt： cmake_minimum_required（VERSION 2.8.3）项目（some_project 包括（FindProtobuf）

set(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/bin)
set(LIBRARY_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/lib)
set_source_files_properties(${PROTO_SRC} ${PROTO_HEADER} PROPERTIES GENERATED TRUE)

# check c++11 / c++0x
include(CheckCXXCompilerFlag)
CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
if(COMPILER_SUPPORTS_CXX11)
    set(CMAKE_CXX_FLAGS "-std=c++11")
elseif(COMPILER_SUPPORTS_CXX0X)
    set(CMAKE_CXX_FLAGS "-std=c++0x")
else()
    message(FATAL_ERROR "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
endif()

set(PROTO_SRC ${PROJECT_SOURCE_DIR}/src-gen)
set(PROTO_HEADER  ${PROJECT_SOURCE_DIR}/src-gen)

find_package(catkin REQUIRED COMPONENTS
  cv_bridge
  roscpp
  sensor_msgs
  std_msgs
  image_transport
)

find_package(OpenCV REQUIRED)
find_package(Protobuf REQUIRED)

catkin_package(
INCLUDE_DIRS include
LIBRARIES uwsim_imgproc filters
CATKIN_DEPENDS cv_bridge roscpp sensor_msgs std_msgs
#  DEPENDS system_lib
)

set(ACTIVEMQ_CPP "/usr/local/lib/libactivemq-cpp.so")
set(ACTIVEMQ_INCLUDE_DIR "/usr/local/include/activemq-cpp-3.8.4/")

set(LIBAPR_LIB "/usr/lib/libapr-1.a")
set(LIBAPR_INCLUDE_DIR "/usr/include/apr-1")


PROTOBUF_GENERATE_CPP(PROTO_SRCS PROTO_HDRS proto/VisionData.proto)

include_directories(
  ${catkin_INCLUDE_DIRS}
  ${OpenCV_INCLUDE_DIRS} 
  ${PROTOBUF_INCLUDE_DIRS}
  ${CMAKE_CURRENT_BINARY_DIR}
  include
  ${ACTIVEMQ_INCLUDE_DIR}
  ${LIBAPR_INCLUDE_DIR}
)

link_directories( 
  ${OpenCV_LINK_DIRS}
)

add_library(filters
      src/HorizonDetector.cpp
        src/ActivemqSender.cpp
)

add_executable(cameraSubscriber src/main.cpp ${PROTO_SRCS} ${PROTO_HDRS})

add_dependencies(cameraSubscriber ${${PROJECT_NAME}_EXPORTED_TARGETS} ${catkin_EXPORTED_TARGETS})

target_link_libraries(filters
   ${OpenCV_LIBRARIES}
)

target_link_libraries(cameraSubscriber
   ${catkin_LIBRARIES}
   ${OpenCV_LIBRARIES}
   ${PROTOBUF_LIBRARIES}
   ${ACTIVEMQCPP_LIBRARIES}
   filters
   ${ACTIVEMQ_CPP}
   ${LIBAPR_LIB}
 )

Answer 1

好的，感谢@Tsyvarev，发现了问题。

它位于CMakeLists.txt文件中指定的链接顺序中。它应具有以下顺序，其中-lpthread位于libapr-1.a

之前

target_link_libraries(cameraSubscriber
   ${catkin_LIBRARIES}
   ${OpenCV_LIBRARIES}
   ${LIBAPR_LIB}
   ${PROTOBUF_LIBRARIES}
   ${ACTIVEMQCPP_LIBRARIES}
   filters
   ${ACTIVEMQ_CPP}

 )

未定义的符号引用＆＃39; sem_close @@ GLIBC_2.2.5＆＃39;

1 个答案: