Unable to compile, ui header never found. (Qt6, Clion, Windows)

[SGaist]

Hi and welcome to devnet,

Looking at the autouic documentation, it think you either have to add gui/ in front of ui_MonkeyWindow.h of your include or add gui to the autouic search paths.

[GAlbert]

Nevermind, thanks a lot for your help, I was about to ask you if I wasn't including gui to the autouic search paths already with this

set(CMAKE_AUTOUIC_SEARCH_PATHS ${CMAKE_CURRENT_SOURCE_DIR}/gui)

But in fact what im doing is adding /src/gui/ as the autouic search paths ... so unless you can tell me how to include /gui/ ill have to keep the .ui and .cpp file in the same folder.

Also, now that it does find the ui header, it says that there's this error:

undefined reference to `vtable for MonkeyWindow'

If I got it correctly its because I forgot to implement a virtual function ? What could I be missing in the .cpp ?

[Christian Ehrlicher]

@GAlbert said in Unable to compile, ui header never found. (Qt6, Clion, Windows):

qt6_wrap_ui(UI_HEADERS ${UI_FILES})

Why? Either use autouic or do it manually. Remove this.

What could I be missing in the .cpp ?

Maybe the Q_OBJECT macro in the header.

[GAlbert]

Why? Either use autouic or do it manually. Remove this.

Yup, didn't know that, learnt it yesterday and fixed my "header not found" problem by using ${CMAKE_CURRENT_SOURCE_DIR}/gui as a autouic parameter.

Maybe the Q_OBJECT macro in the header.

Nah, I already have the Q_OBJECT macro in the header :/
Here it is:

#include <QMainWindow>

QT_BEGIN_NAMESPACE
namespace Ui { class MonkeyWindow; }
QT_END_NAMESPACE

class MonkeyWindow : public QMainWindow {
Q_OBJECT

public:
    explicit MonkeyWindow(QWidget *parent = nullptr);
    ~MonkeyWindow() override;

private:
    Ui::MonkeyWindow *ui;
};

[SGaist]

Nuke the build folder and start again, it might be stale from all the tests you did to get uic sorted out.

[GAlbert]

@SGaist Just did, still got hit with the

C:\Users\Albert\AppData\Local\Programs\CLion\bin\mingw\bin/ld.exe: CMakeFiles/MonkeyModelKit.dir/src/gui/MonkeyWindow.cpp.obj:MonkeyWindow.c:(.rdata$.refptr._ZTV12MonkeyWindow[.refptr._ZTV12MonkeyWindow]+0x0): undefined reference to `vtable for MonkeyWindow'
collect2.exe: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

😢

By the way, is there a way for me to get exactly what this refptr is that is not defined ? I assume if I find what ".refptr._ZTV12MonkeyWindow]+0x0" is I might be able to define it ? Or am I too C based pointer pilled ?

[Christian Ehrlicher]

Where is your header file located? Normally AUTOMOC should parse your header and generate & compile the corresponding moc_MonkeyWindow.cpp
Please add #include "moc_MonkeyWindow.cpp" at the end of your MonkeyWindow.cpp to see if this fixes the problem. Or add MonkeyWindow.hpp to your SOURCES to see if this helps (it should according the sources).

[GAlbert]

@Christian-Ehrlicher uhhhm... I think we got our culprit, I ain't finding no "moc_MonkeyWindow.cpp" file in the build dir... the closest file name I could find would be "mocs_compilation.cpp"

[GAlbert]

Alright, it looks like the moc file can not be generated if the only way I add headers is by using :

include_directories(
        include/
        include/col
        include/run
        include/gui
        gui/
)

What I in fact need to do is :

set(HEADERS
        include/gui/MonkeyWindow.hpp
)

And manually add all the headers... Unless someone knows how to fix this ill have to add all the headers manually ...

[MoonFeather]

I've solve this problem by copying Qt Creator and docs' CMake configuration.
First do include ui_*.h file in the beginning, ignoring error from IDEs:

// in my project, the mainwindow.cpp and mainwindow.ui are in same folder
#include "./ui_mainwindow.h"

Then add CMake options like this, and run cmake.

-DCMAKE_PREFIX_PATH=C:\Qt\6.7.2\mingw_64\lib\cmake
-DCMAKE_GENERATOR:STRING=Ninja
-DQT_QMAKE_EXECUTABLE:FILEPATH=C:/Qt/6.7.2/mingw_64/bin/qmake.exe
-DCMAKE_C_COMPILER:FILEPATH=C:/Qt/Tools/mingw1120_64/bin/gcc.exe
-DCMAKE_CXX_COMPILER:FILEPATH=C:/Qt/Tools/mingw1120_64/bin/g++.exe
-DCMAKE_CXX_FLAGS_INIT:STRING=-DQT_QML_DEBUG
# Remember to substitute with real path

Finally, run this command:

cmake --build <your-build-path> --target all

the key is the "--target all" option.
you can add this option in CLion by Preference -> CMake -> Cache Variables -> Build options.

[MoonFeather]

Also, for different file path of .ui file, both change CMakeLists.txt:

set(PROJECT_SOURCES
        main.cpp
        mainwindow.cpp
        mainwindow.h
        Form/mainwindow.ui
)

and the mainwindow.cpp's include path:

#include "./Form/ui_mainwindow.h"