emit(s) build errors using mingw64

shathcock

Sorry for the several posts the last couple of days but here is the latest. I have an application that has been working for a month and I have been making minor changes to it. I was using msvc 2019 until I had to do an update to it and everything just seemed to fall apart. Finally I have given up and decided to use Mingw64 instead. Everything builds fine except I get a undefined reference error to every emit call in the program, a couple of errors - undefined reference to vtable and finally collect2.exe returned exit status of 1. Any Ideas before I just give up on Qt. I used to use it exclusively years ago and never had the kind of problems I seem to be fighting with every day now. Oh I am using Cmake not qmake with Qt 6.0.1. Any help would be greatly appreciated.

Christian Ehrlicher

Please show your cmake script. Did you enable AUTOMOC or do you use another way to generate the moc files?

shathcock

@Christian-Ehrlicher When you say the Cmake script do you mean the CmakeLists.txt if so here is what I have.

cmake_minimum_required(VERSION 3.5)

project(DXT LANGUAGES CXX)

set(CMAKE_INCLUDE_CURRENT_DIR ON)

set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

# QtCreator supports the following variables for Android, which are identical to qmake Android variables.
# Check https://doc.qt.io/qt/deployment-android.html for more information.
# They need to be set before the find_package( ...) calls below.

#if(ANDROID)
#    set(ANDROID_PACKAGE_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/android")
#    if (ANDROID_ABI STREQUAL "armeabi-v7a")
#        set(ANDROID_EXTRA_LIBS
#            ${CMAKE_CURRENT_SOURCE_DIR}/path/to/libcrypto.so
#            ${CMAKE_CURRENT_SOURCE_DIR}/path/to/libssl.so)
#    endif()
#endif()

find_package(QT NAMES Qt6 Qt5 COMPONENTS Widgets REQUIRED)
find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Widgets REQUIRED)

set(PROJECT_SOURCES
    main.cpp
    mainwindow.cpp
    ditaTransform.cpp
    procedure.cpp
    processDitaConcept.cpp
    processDitaTitle.cpp
    processDitaHeaderandProlog.cpp
    processDitaConbody.cpp
    processDitaSteps.cpp
    processBranching.cpp
    writeXmlFile.cpp
    mainwindow.h
    ditaTransform.h
    procedure.h
    mainwindow.ui
    icons.qrc
)

if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
    set(app_icon_resource_windows "${CMAKE_CURRENT_SOURCE_DIR}/icons.rc")
    qt_add_executable(DXT ${PROJECT_SOURCES} ${app_icon_resource_windows})

    #qt_add_executable(DXT
    #    ${PROJECT_SOURCES}
    #)
else()
    if(ANDROID)
        add_library(DXT SHARED
            ${PROJECT_SOURCES}
        )
    else()
        add_executable(DXT
            ${PROJECT_SOURCES}
        )
    endif()
endif()

target_link_libraries(DXT PRIVATE Qt${QT_VERSION_MAJOR}::Widgets)

Christian Ehrlicher

Are moc files generated in to build dir? Do you use a clean build dir? Are you sure you use the correct Qt version (for MinGW) and did not mix up with the MSVC binaries?

shathcock

@Christian-Ehrlicher Wow that did it...Thank you very much I have no idea what happened. It is a brand new install of Qt 6.0.1 with a brand new build directory. I deleted the directory and did a build again and it works. Thanks again!!

Christian Ehrlicher

@shathcock Nice. lease don't forget to mark the topic as solved then.

shathcock

@Christian-Ehrlicher Just about to Thanks again!! It has been a very frustrating couple of days.

Christian Ehrlicher

The first thing to do with sch problems is to start with a clean build dir :)