I have a c++ qt5 "hello world" cmake project; Here are my main.cpp and CMakeLists.txt files:
#include <QApplication>
#include <QWidget>
#include <QGridLayout>
#include <QLabel>
int main(int argc, char **argv)
{
QApplication app(argc, argv);
QWidget widget;
widget.resize(640, 480);
widget.setWindowTitle("Hello, world!!!");
QGridLayout *gridLayout = new QGridLayout(&widget);
QLabel * label = new QLabel("Hello, world!!!");
label->setAlignment(Qt::AlignVCenter | Qt::AlignHCenter);
gridLayout->addWidget(label);
widget.show();
return app.exec();
}
cmake_minimum_required(VERSION 3.1.0)
project(helloworld)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)
set(CMAKE_AUTOUIC ON)
if(CMAKE_VERSION VERSION_LESS "3.7.0")
set(CMAKE_INCLUDE_CURRENT_DIR ON)
endif()
message("cmake source dir = ${CMAKE_SOURCE_DIR}")
set (Qt5_DIR "/mingw64/lib/cmake/Qt5")
find_package(Qt5 COMPONENTS Widgets REQUIRED)
add_executable(helloworld
main.cpp
)
target_link_libraries(helloworld Qt5::Widgets)
I just copy CMakeList from official page and write down some very basic main.cpp. Then I built it on my Linux (openSUSE 15.0) and everything works fine. Now I want to build in on MSYS2 (to get windows version). First I could not build cmake project because Qt5Config.cmake file was not found. I added
set (Qt5_DIR "/mingw64/lib/cmake/Qt5")
to find Qt5Config.cmake file "manually". After adding this to my cmake file the project had been built fine. But when I run make
to compile program I get the following errors:
[ 25%] Automatic MOC and UIC for target helloworld
[ 25%] Built target helloworld_autogen
[ 50%] Linking CXX executable helloworld.exe
CMakeFiles/helloworld.dir/main.cpp.o:main.cpp:(.text$_ZN15QTypedArrayDataItE10deallocateEP10QArrayData[_ZN15QTypedArrayDataItE10deallocateEP10QArrayData]+0x1c): undefined reference to `QArrayData::deallocate(QArrayData*, unsigned long, unsigned long)'
CMakeFiles/helloworld.dir/main.cpp.o:main.cpp:(.text$_ZN15QTypedArrayDataItE10deallocateEP10QArrayData[_ZN15QTypedArrayDataItE10deallocateEP10QArrayData]+0x1c): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `QArrayData::deallocate(QArrayData*, unsigned long, unsigned long)'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/helloworld.dir/build.make:102: helloworld.exe] Error 1
make[1]: *** [CMakeFiles/Makefile2:73: CMakeFiles/helloworld.dir/all] Error 2
make: *** [Makefile:84: all] Error 2
As I can understand there are some missing libraries that could not be found. But I do not know how to fix it.
您不需要CMakeLists.tx,您只需按构建按钮
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