1
我试图修改Kdevelop Qt 4 CMake项目，以便与Qt 5一起编译并更改了项目，但是我失败了。 我还在学习Qt，这个项目很简单。 评论行被替换，使其成为一个Qt 5项目。如何在没有QtCreator的情况下编译Qt 5项目？
main.cpp中：
//#include <QtGui/QApplication>
#include <qt5/QtWidgets/QApplication>
#include "Qt4_Training.h"
int main(int argc, char** argv)
{
QApplication app(argc, argv);
Qt4_Training qt4_training;
qt4_training.show();
return app.exec();
}
Qt4_Training.cpp：
#include "Qt4_Training.h"
/*#include <QtGui/QLabel>
#include <QtGui/QMenu>
#include <QtGui/QMenuBar>
#include <QtGui/QAction>
#include <QtGui/QPushButton>
#include <QTime>*/
#include <qt5/QtWidgets/QLabel>
#include <qt5/QtWidgets/QMenu>
#include <qt5/QtWidgets/QMenuBar>
#include <qt5/QtWidgets/QAction>
#include <qt5/QtWidgets/QPushButton>
#include <qt5/QtCore/QTime>
Qt4_Training::Qt4_Training()
{
QLabel *label = new QLabel;
vbox = new QVBoxLayout;
label.setText("Hi.");
vbox->addWidget(label);
QWidget *a = new QWidget;
a->setLayout(vbox);
setCentralWidget(a);
QAction* action = new QAction(this);
action->setText("Quit");
connect(action, SIGNAL(triggered()), SLOT(close()));
menuBar()->addMenu("File")->addAction(action);
}
Qt4_Training::~Qt4_Training() {}
//#include "Qt4_Training.moc"
Qt4_Training.h：
#ifndef Qt4_Training_H
#define Qt4_Training_H
/*#include <QtGui/QMainWindow>
#include <QtGui/QVBoxLayout>*/
#include <qt5/QtWidgets/QMainWindow>
#include <qt5/QtWidgets/QVBoxLayout>
class Qt4_Training : public QMainWindow
{
//Q_OBJECT
public:
QVBoxLayout *vbox;
Qt4_Training();
virtual ~Qt4_Training();
};
#endif // Qt4_Training_H
的CMakeLists.txt：
cmake_minimum_required(VERSION 3.0.2)
project(qt4_training)
#find_package(Qt4 REQUIRED)
find_package(Qt5Widgets REQUIRED)
find_package(Qt5Core REQUIRED)
#include_directories(${QT_INCLUDES} ${CMAKE_CURRENT_BINARY_DIR})
include_directories(${Qt5Widgets_INCLUDE_DIRS} ${Qt5Widgets_LIBRARIES} ${CMAKE_CURRENT_BINARY_DIR} ${Qt5Core_INCLUDE_DIRS} ${Qt5Core_LIBRARIES})
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${Qt5Widgets_EXECUTABLE_COMPILE_FLAGS}")
set(Qt4_Training_SRCS Qt4_Training.cpp main.cpp)
#qt4_automoc(${Qt4_Training_SRCS})
add_executable(qt4_training ${Qt4_Training_SRCS})
target_link_libraries(qt4_training ${QT_QTCORE_LIBRARY} ${QT_QTGUI_LIBRARY})
install(TARGETS qt4_training RUNTIME DESTINATION bin)
我也尝试过使用Eclipse并使用'#include'，但所有对象名称都必须以'Private'结尾，如'QLabelPrivate ...;'。
KDevelop的错误：
...
CMakeFiles/qt4_training.dir/main.cpp.o: In function `main':
main.cpp:(.text.startup+0x37): undefined reference to `QApplication::QApplication(int&, char**, int)'
main.cpp:(.text.startup+0x47): undefined reference to `QWidget::show()'
main.cpp:(.text.startup+0x4c): undefined reference to `QApplication::exec()'
main.cpp:(.text.startup+0x5f): undefined reference to `QApplication::~QApplication()'
main.cpp:(.text.startup+0x96): undefined reference to `QApplication::~QApplication()'
collect2: error: ld returned 1 exit status
CMakeFiles/qt4_training.dir/build.make:110: recipe for target 'qt4_training' failed
make[2]: *** [qt4_training] Error 1
CMakeFiles/Makefile2:60: recipe for target 'CMakeFiles/qt4_training.dir/all' failed
make[1]: *** [CMakeFiles/qt4_training.dir/all] Error 2
Makefile:117: recipe for target 'all' failed
make: *** [all] Error 2
*** Failure: Exit code 2 ***
Eclipse的错误：
In file included from ../src/Qt 5 Training.cpp:1:0:
/usr/include/x86_64-linux-gnu/qt5/QtWidgets/qapplication.h:37:37: fatal error: QtCore/qcoreapplication.h: No such file or directory
#include <QtCore/qcoreapplication.h>
^
compilation terminated.
src/subdir.mk:21: recipe for target 'src/Qt 5 Training.o' failed
make: *** [src/Qt 5 Training.o] Error 1
我安装libqt5widgets5，qtdeclarative5-dev的，libqt5gui5，qtbase5-dev的，...上的Kubuntu。那么我有Qt 5吗？