epolloneshot_test.cpp:(.text+0x582): undefined reference to `pthread_create‘

原创 于 2021-06-03 00:57:04 发布 · 169 阅读 · 0 ·
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博客提及编译指令需在尾部添加，但未给出更多详细信息。

编译指令需要在尾部加上-lpthread，如下：

g++ -o epolloneshot_test epolloneshot_test.cpp -lpthread
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/opt/rh/devtoolset-9/root/usr/libexec/gcc/x86_64-redhat-linux/9/ld: /opt/rh/devtoolset-9/root/usr/lib/gcc/x86_64-redhat-linux/9/libstdc++_nonshared.a(thread48.o): in function `std::thread::_M_start_thread(std::unique_ptr<std::thread::_State, std::default_delete<std::thread::_State> >, void (*)())': (.text._ZNSt6thread15_M_start_threadESt10unique_ptrINS_6_StateESt14default_deleteIS1_EEPFvvE+0x11): undefined reference to `pthread_create' /opt/rh/devtoolset-9/root/usr/libexec/gcc/x86_64-redhat-linux/9/ld: /opt/rh/devtoolset-9/root/usr/lib/gcc/x86_64-redhat-linux/9/libstdc++_nonshared.a(thread48.o): in function `std::thread::_M_start_thread(std::shared_ptr<std::thread::_Impl_base>, void (*)())': (.text._ZNSt6thread15_M_start_threadESt10shared_ptrINS_10_Impl_baseEEPFvvE+0x60): undefined reference to `pthread_create' /opt/rh/devtoolset-9/root/usr/libexec/gcc/x86_64-redhat-linux/9/ld: test.o: in function `std::thread::thread<ThreadPool::ThreadPool(int)::{lambda()#1}, , void>(ThreadPool::ThreadPool(int)::{lambda()#1}&&)': test.cpp:(.text._ZNSt6threadC2IZN10ThreadPoolC4EiEUlvE_JEvEEOT_DpOT0_[_ZNSt6threadC5IZN10ThreadPoolC4EiEUlvE_JEvEEOT_DpOT0_]+0x21): undefined reference to `pthread_create' /opt/rh/devtoolset-9/root/usr/libexec/gcc/x86_64-redhat-linux/9/ld: log.o: in function `std::thread::thread<void (&)(), , void>(void (&)())': log.cpp:(.text._ZNSt6threadC2IRFvvEJEvEEOT_DpOT0_[_ZNSt6threadC5IRFvvEJEvEEOT_DpOT0_]+0x21): undefined reference to `pthread_create' /opt/rh/devtoolset-9/root/usr/libexec/gcc/x86_64-redhat-linux/9/ld: sqlconnpool.o: in function `SqlConnPool::GetConn()': sqlconnpool.cpp:(.text+0x13d): undefined reference to `sem_wait' /opt/rh/devtoolset-9/root/usr/libexec/gcc/x86_64-redhat-linux/9/ld: sqlconnpool.o: in function `SqlConnPool::FreeConn(MYSQL*)': sqlconnpool.cpp:(.text+0x207): undefined reference to `sem_post' /opt/rh/devtoolset-9/root/usr/libexec/gcc/x86_64-redhat-linux/9/ld: sqlconnpool.o: in function `SqlConnPool::Init(char const*, int, char const*, char const*, char const*, int)': sqlconnpool.cpp:(.text+0x2e7): undefined reference to `mysql_init' /opt/rh/devtoolset-9/root/usr/libexec/gcc/x86_64-redhat-linux/9/ld: sqlconnpool.cpp:(.text+0x3a5): undefined reference to `mysql_real_connect' /opt/rh/devtoolset-9/root/usr/libexec/gcc/x86_64-redhat-linux/9/ld: sqlconnpool.cpp:(.text+0x45d): undefined reference to `sem_init' /opt/rh/devtoolset-9/root/usr/libexec/gcc/x86_64-redhat-linux/9/ld: sqlconnpool.o: in function `SqlConnPool::ClosePool()': sqlconnpool.cpp:(.text+0x4ce): undefined reference to `mysql_close' /opt/rh/devtoolset-9/root/usr/libexec/gcc/x86_64-redhat-linux/9/ld: sqlconnpool.cpp:(.text+0x4d5): undefined reference to `mysql_server_end' collect2: error: ld returned 1 exit status make: *** [test1] 错误 1，逐条分析错误
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undefined reference to `pthread_create' (std::thread::_M_start_thread) ``` - **原因**： - 项目使用了 C++11 的 `std::thread`，但未链接 POSIX 线程库（`pthread`）。 - `std::thread` 在底层依赖 `...
Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output: Change Dir: /home/colin/grasp_ws/build/CMakeFiles/CMakeTmp Run Build Command(s):/usr/bin/make cmTC_7b988/fast && /usr/bin/make -f CMakeFiles/cmTC_7b988.dir/build.make CMakeFiles/cmTC_7b988.dir/build make[1]: 进入目录“/home/colin/grasp_ws/build/CMakeFiles/CMakeTmp” Building C object CMakeFiles/cmTC_7b988.dir/src.c.o /usr/bin/cc -DCMAKE_HAVE_LIBC_PTHREAD -o CMakeFiles/cmTC_7b988.dir/src.c.o -c /home/colin/grasp_ws/build/CMakeFiles/CMakeTmp/src.c Linking C executable cmTC_7b988 /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_7b988.dir/link.txt --verbose=1 /usr/bin/cc -DCMAKE_HAVE_LIBC_PTHREAD CMakeFiles/cmTC_7b988.dir/src.c.o -o cmTC_7b988 /usr/bin/ld: CMakeFiles/cmTC_7b988.dir/src.c.o: in function `main': src.c:(.text+0x46): undefined reference to `pthread_create' /usr/bin/ld: src.c:(.text+0x52): undefined reference to `pthread_detach' /usr/bin/ld: src.c:(.text+0x63): undefined reference
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[main] 正在生成文件夹: /home/aiec/Templates/test/build all [build] 正在启动生成 [proc] 正在执行命令: /usr/bin/cmake --build /home/aiec/Templates/test/build --config Debug --target all -j 8 -- [build] Consolidate compiler generated dependencies of target CrossCompileProject [build] [ 50%] Linking CXX executable bin/CrossCompileProject [build] /usr/bin/ld: /usr/lib/aarch64-linux-gnu/libopencv_videoio.a(cap_gstreamer.cpp.o): in function `cv::GStreamerCapture::retrieveFrame(int, cv::_OutputArray const&)': [build] (.text._ZN2cv16GStreamerCapture13retrieveFrameEiRKNS_12_OutputArrayE+0x2b4): undefined reference to `gst_video_info_from_caps' [build] /usr/bin/ld: /usr/lib/aarch64-linux-gnu/libopencv_videoio.a(cap_gstreamer.cpp.o): in function `cv::handleMessage(_GstElement*)': [build] (.text._ZN2cvL13handleMessageEP11_GstElement+0xdc): undefined reference to `gst_is_missing_plugin_message' [build] /usr/bin/ld: /usr/lib/aarch64-linux-gnu/libopencv_videoio.a(cap_gstreamer.cpp.o): in function `cv::CvVideoWriter_GStreamer::open(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int, double, cv::Size_<int> const&, cv::VideoWriterParameters const&)': [build] (.text._ZN2cv23CvVideoWriter_GStreamer4openERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEidRKNS_5Size_IiEERKNS_21VideoWriterParametersE+0x16b4): undefined reference to `gst_riff_create_video_caps' [build] /usr/bin/ld: (.text._ZN2cv23CvVideoWriter_GStreamer4openERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEidRKNS_5Size_IiEERKNS_21VideoWriterParametersE+0x1724): undefined reference to `gst_encoding_container_profile_new' [build] /usr/bin/ld: (.text._ZN2cv23CvVideoWriter_GStreamer4openERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEidRKNS_5Size_IiEERKNS_21VideoWriterParametersE+0x1744): undefined reference to `gst_encoding_video_profile_new' [build] /usr/bin/ld: (.text._ZN2cv23CvVideoWriter_GStreamer4openERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEidRKNS_5Size_IiEERKNS_21VideoWriterParametersE+0x1764): undefined reference to `gst_encoding_container_profile_add_profile' [build] /usr/bin/ld: /usr/lib/aarch64-linux-gnu/libopencv_videoio.a(cap_v4l.cpp.o): in function `cv::CvCaptureCAM_V4L::convertToRgb(cv::Buffer const&)': [build] (.text._ZN2cv16CvCaptureCAM_V4L12convertToRgbERKNS_6BufferE+0x610): undefined reference to `cv::imdecode(cv::_InputArray const&, int, cv::Mat*)' [build] /usr/bin/ld: /usr/lib/aarch64-linux-gnu/libopencv_videoio.a(cap_images.cpp.o): in function `cv::CvCapture_Images::grabFrame()': [build] (.text._ZN2cv16CvCapture_Images9grabFrameEv+0x60): undefined reference to `cv::imread(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)' [build] /usr/bin/ld: /usr/lib/aarch64-linux-gnu/libopencv_videoio.a(cap_images.cpp.o): in function `cv::CvVideoWriter_Images::open(char const*)': [build] (.text._ZN2cv20CvVideoWriter_Images4openEPKc+0x134): undefined reference to `cv::haveImageWriter(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' [build] /usr/bin/ld: /usr/lib/aarch64-linux-gnu/libopencv_videoio.a(cap_images.cpp.o): in function `cv::CvCapture_Images::open(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)': [build] (.text._ZN2cv16CvCapture_Images4openERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x1b4): undefined reference to `cv::haveImageReader(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' [build] /usr/bin/ld: /usr/lib/aarch64-linux-gnu/libopencv_videoio.a(cap_images.cpp.o): in function `cv::CvVideoWriter_Images::writeFrame(_IplImage const*)': [build] (.text._ZN2cv20CvVideoWriter_Images10writeFrameEPK9_IplImage+0x100): undefined reference to `cv::imwrite(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, cv::_InputArray const&, std::vector<int, std::allocator<int> > const&)' [build] /usr/bin/ld: /usr/lib/aarch64-linux-gnu/libopencv_videoio.a(cap_mjpeg_decoder.cpp.o): in function `cv::MotionJpegCapture::retrieveFrame(int, cv::_OutputArray const&)': [build] (.text._ZN2cv17MotionJpegCapture13retrieveFrameEiRKNS_12_OutputArrayE+0x94): undefined reference to `cv::imdecode(cv::_InputArray const&, int)' [build] /usr/bin/ld: /usr/lib/aarch64-linux-gnu/libopencv_videoio.a(cap_dc1394_v2.cpp.o): in function `CvDC1394::~CvDC1394()': [build] (.text._ZN8CvDC1394D2Ev+0xc): undefined reference to `dc1394_free'上文中错误如何解决
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