未定义的符号引用 'sem_close@@GLIBC_2.2.5'
undefined reference to symbol 'sem_close@@GLIBC_2.2.5'
我正在尝试编译一个使用了 ActiveMQ 函数的项目（因此使用了库），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
我必须说在代码方面我没有怀疑，它工作正常。我在格式化计算机后开始出现此错误，其中 ActiveMQ 所需的几个库之一可能已经消失。 libapr 当然是其中之一。
但是，我的电脑上确实安装了这个库。当我找到它时，我可以看到它是 w:
/usr/lib/libapr-1.a
/usr/lib/x86_64-linux-gnu/libapr-1.a
/usr/local/apr/lib/libapr-1.a
原来如此。而且在我的 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")
所以我不知道是什么原因导致的错误。我到处都看了，还是没有答案。
有什么想法吗？
P.S: 我的完整 CMakeLists.txt :
cmake_minimum_required（版本 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}
)
好的，感谢@Tsyvarev ，找到问题了
它位于 CMakeLists.txt 文件中指定的链接顺序内。它应该具有以下顺序，其中 -lpthread 在 libapr-1.a
之前
target_link_libraries(cameraSubscriber
${catkin_LIBRARIES}
${OpenCV_LIBRARIES}
${LIBAPR_LIB}
${PROTOBUF_LIBRARIES}
${ACTIVEMQCPP_LIBRARIES}
filters
${ACTIVEMQ_CPP}
)
我正在尝试编译一个使用了 ActiveMQ 函数的项目（因此使用了库），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
我必须说在代码方面我没有怀疑，它工作正常。我在格式化计算机后开始出现此错误，其中 ActiveMQ 所需的几个库之一可能已经消失。 libapr 当然是其中之一。
但是，我的电脑上确实安装了这个库。当我找到它时，我可以看到它是 w:
/usr/lib/libapr-1.a
/usr/lib/x86_64-linux-gnu/libapr-1.a
/usr/local/apr/lib/libapr-1.a
原来如此。而且在我的 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")
所以我不知道是什么原因导致的错误。我到处都看了，还是没有答案。
有什么想法吗？
P.S: 我的完整 CMakeLists.txt :
cmake_minimum_required（版本 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}
)
好的，感谢@Tsyvarev ，找到问题了
它位于 CMakeLists.txt 文件中指定的链接顺序内。它应该具有以下顺序，其中 -lpthread 在 libapr-1.a
target_link_libraries(cameraSubscriber
${catkin_LIBRARIES}
${OpenCV_LIBRARIES}
${LIBAPR_LIB}
${PROTOBUF_LIBRARIES}
${ACTIVEMQCPP_LIBRARIES}
filters
${ACTIVEMQ_CPP}
)