在linux下编写多线程,已经添加#include<pthread.h>头文件,qt编译器提示: error: undefined reference to `pthread_create'。 经过百度,得知:“pthread 库不是 Linux 系统默认的库,连接时需要使用静态库 libpthread.a,所以在使用pthread_create()创建线程,以及调用 pthread_atfork()函数建立fork处理程序时,需要链接该...
qt_hello_world.o: In function 'main': undefined reference to QApplication::QApplication(int&, char**, int) qt_hello_world.cpp: undefined reference to QPushButton::QPushButton(QString const&, QWidget*) qt_hello_world.cpp: undefined reference to QWidget::show() qt_hello_world.cpp...
release/widget.o:widget.cpp:(.text+0x15e1):undefinedreferenceto`cv::fastFree(void*)' release/widget.o:widget.cpp:(.text+0x15f2):undefinedreferenceto`cv::_OutputArray::_OutputArray(cv::Mat&)' release/widget.o:widget.cpp:(.text+0x1605):undefinedreferenceto`cv::_InputArray::_InputArray(cv...
text+0x631): undefined reference to `cv::fastFree(void*)' release/widget.o:widget.cpp:(.text+0x63b): undefined reference to `cv::_OutputArray::_OutputArray(cv::Mat&)' release/widget.o:widget.cpp:(.text+0x64b): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)...
例如出现如下错误: 错误:undefined reference to `SortDialog::on_moreBtn_clicked()'尝试一下 重新执行 qmake
) ${CODE_LIB_FILES} is list holding path of libMyApp.a MyApp builds successfully and at last shows linking error undefined reference to `QPrinter::QPrinter(QPrinter::PrinterMode) Same thing happening with xml also undefined reference to `QDomNode::isElement() const' ...
/usr/bin/ld: .obj/qlogging.o: in function `backtraceFramesForLogMessage(int)': qlogging.cpp:(.text+0x1bf4): undefined reference to `backtrace' /usr/bin/ld: qlogging.cpp:(.text+0x1cd7): undefined reference to `backtrace_symbols' collect2: error: ld returned 1 exit status make[3]: ...
简介:QT5在windows下调用OpenCV库出现: undefined reference to `xxxxx' 错误解决办法(适用MinGW编译器)。 一、环境介绍 window系统:win10 X64 QT版本: 5.12 QT5.12自带的MinGW编译器版本:mingw730_32 与mingw730_64 在QT的安装目录下,可以查看MinGW编译器的版本: ...
/opt/qt57/lib/libQt5Test.so.5: undefined reference toQString::toLongLong(bool*, int) const@Qt_5' /opt/qt57/lib/libQt5Test.so.5: undefined reference toQWaitCondition::wait(QMutex*, unsigned long)@Qt_5' /opt/qt57/lib/libQt5Test.so.5: undefined reference toQObject::customEvent(...
error:no matching function for call to'QDrag::QDrag(QWidget*)' 要解决这个附加组件,其中包括: #include <QWidget> qFindChildren已被弃用 这种方式会弹出一个错误: error:'qFindChildren'was not declared inthisscope 为了解决这个问题,将qFindChildren替换为findChildren,例如 ...