我正在嘗試設定一個構建 Qt-Widgets 應用程式的 CMake 專案，但無法正確編譯它。我的專案結構如下：
- 包括/
- 主視窗.hpp
- 資源/
- 主視窗.ui
- 源/
- 主檔案
- 主視窗.cpp
- CMakeLists.txt
CMakeLists.txt
cmake_minimum_required(VERSION 3.10)
find_package(Qt5 COMPONENTS Widgets REQUIRED)
project(Test VERSION 0.1 LANGUAGES CXX)
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTOUIC_SEARCH_PATHS resources)
add_executable(App src/mainwindow.cpp src/main.cpp resources/mainwindow.ui)
target_include_directories(App PRIVATE include)
target_link_libraries(App PRIVATE Qt5::Widgets)
主視窗.hpp
#ifndef MAINWINDOW_HPP_
#define MAINWINDOW_HPP_
#include <QMainWindow>
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class Test : public QMainWindow {
Q_OBJECT
public:
Test(QWidget *parent = nullptr);
~Test();
private:
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_HPP_
主視窗.cpp
#include "mainwindow.hpp"
#include "ui_mainwindow.h"
Test::Test(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow){
ui->setupUi(this);
}
Test::~Test(){
delete ui;
}
主檔案
#include "mainwindow.hpp"
#include <QApplication>
int main(int argc, char *argv[]){
QApplication a(argc, argv);
Test w;
w.show();
return a.exec();
}
當我嘗試構建專案時：
cmake -Bbuild -DCMAKE_BUILD_TYPE=Debug
cmake --build build --target all
我收到以下聯結器錯誤：
[ 20%] Automatic MOC and UIC for target App
[ 20%] Built target App_autogen
[ 40%] Building CXX object CMakeFiles/App.dir/App_autogen/mocs_compilation.cpp.o
[ 60%] Building CXX object CMakeFiles/App.dir/src/mainwindow.cpp.o
[ 80%] Building CXX object CMakeFiles/App.dir/src/main.cpp.o
[100%] Linking CXX executable App
/usr/bin/ld: CMakeFiles/App.dir/src/mainwindow.cpp.o: in function `Test::Test(QWidget*)': .../src/mainwindow.cpp:4: undefined reference to `vtable for Test'
/usr/bin/ld: .../src/mainwindow.cpp:4: undefined reference to `vtable for Test'
/usr/bin/ld: CMakeFiles/App.dir/src/mainwindow.cpp.o: in function `Test::~Test()': .../src/mainwindow.cpp:8: undefined reference to `vtable for Test'
/usr/bin/ld: .../src/mainwindow.cpp:8: undefined reference to `vtable for Test'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/App.dir/build.make:132: App] Error 1
make[1]: *** [CMakeFiles/Makefile2:84: CMakeFiles/App.dir/all] Error 2
make: *** [Makefile:91: all] Error 2
查看生成的 cmakes link.txt，似乎所需的目標檔案已正確鏈接
/usr/bin/c \
-g CMakeFiles/App.dir/App_autogen/mocs_compilation.cpp.o \
CMakeFiles/App.dir/src/mainwindow.cpp.o \
CMakeFiles/App.dir/src/main.cpp.o \
-o App \
/usr/lib/libQt5Widgets.so.5.15.4 \
/usr/lib/libQt5Gui.so.5.15.4 \
/usr/lib/libQt5Core.so.5.15.4
我不太確定，為什么 vtable 參考未定義。我在這里做錯了什么？
uj5u.com熱心網友回復：
解決這個問題的方法是添加include/mainwindow.hpp源。
add_executable(App src/mainwindow.cpp src/main.cpp include/mainwindow.hpp resources/mainwindow.ui)
這似乎是生成ui_mainwindow.h查看 MainWindow 類的 vtable 條目所必需的。
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