no header providing "Q_OBJECT" is directly included

[msauer751]

Hi,
I use Qt Creator 18.0.1 and Qt 6.10.1 to compile my project. In Qt Creator I get the following warning

command-controller.h:41:4: no header providing "Q_OBJECT" is directly included [misc-include-cleaner]

But in my code I includ <QObject>.

#ifndef COMMAND_CONTROLLER_H
#define COMMAND_CONTROLLER_H

// Includes
//---------------------------------------------------------------------------------------------------------------------
// own header

// other includes
#include "framework/command.h"
#include "navigation-controller.h"
#include "sp-new.h"
#include "sp.h"
#include "wm-lib_global.h"

// system includes
#include <QObject>
#include <QList>
#include <QtQml/QQmlListProperty>

// Macros/Defines
//----------------------------------------------------------------------------------------------------------------------

// Forward declarations
//----------------------------------------------------------------------------------------------------------------------

using namespace Framework;

namespace Controllers {

class WMLIBSHARED_EXPORT CommandController : public QObject
{
   Q_OBJECT

   Q_PROPERTY(QQmlListProperty<Framework::Command> uiEditViewContextCommands READ
                  uiEditViewContextCommands CONSTANT)
   Q_PROPERTY(QQmlListProperty<Framework::Command> uiImageViewContextCommands READ
                  uiImageViewContextCommands CONSTANT)
   Q_PROPERTY(QQmlListProperty<Framework::Command> uiFindViewContextCommands READ
                  uiFindViewContextCommands CONSTANT)
   Q_PROPERTY(QQmlListProperty<Framework::Command> uiSpMapViewContextCommands READ
                  uiSpMapViewContextCommands CONSTANT)
   Q_PROPERTY(QQmlListProperty<Framework::Command> uiNewViewContextCommands READ
                  uiNewViewContextCommands CONSTANT)
   Q_PROPERTY(QQmlListProperty<Framework::Command> uiImageAddContextCommands READ
                  uiImageAddContextCommands CONSTANT)

How can I avoid this warnings?
Thank you for your help
BR
Martin

[Axel Spoerl]

Hi @msauer751,

I can't reproduce this with Creator 18.0.1 and Qt 6.10.2.
The patch release difference shouldn't be the reason.

At first, please try including the Qt stuff first. Maybe some of the project specific includes already hit the pragma, making #include <QObject> toothless.

Maybe the include path is broken. You could check this by double clicking on the QObject include statement and see where you land.

As a last resort, you can try to #include <qobjectdefs.h> directly. Hammer-fix, a kitten will die.

[msauer751]

Hi @Axel-Spoerl ,

I have to add #include <qtmetamacros.h> to avoid this warning.

BR
martin

[SGaist]

Hi,

Then something is off. Including QObject should be enough.
Which project management system are you using ? qmake or cmake ?

[msauer751]

Hi @SGaist

cmake.

And with CMakeLists.txt of the project

cmake_minimum_required(VERSION 3.16)

set(APP "qt_wm")
set(VER "1.0")

message("CMAKE fuer project: " ${APP})

project(${APP} VERSION ${VER} LANGUAGES CXX)

#set(CMAKE_BINARY_DIR "${CMAKE_SOURCE_DIR}/_Build/Bin/${CMAKE_SYSTEM_NAME}/${CMAKE_BUILD_TYPE}")
#set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
#set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
#set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
set(LIBTYP "SHARED")
set(CMAKE_CXX_STANDARD 23)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)
set(CMAKE_AUTOUIC ON)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
#set(CMAKE_CXX_CLANG_TIDY clang-tidy)

if (WIN32)
    set(SSLDIR "E:/Qt/Tools/OpenSSLv3/Win_x64/bin/")
    set(SSLLIB1 "libcrypto-3-x64.dll")
    set(SSLLIB2 "libssl-3-x64.dll")
    message("    WIN32: SSLDIR=" ${SSLDIR})
    message("    WIN32: SSLLIB=" ${SSLLIB1} " " ${SSLLIB2})
elseif (UNIX)
    #set(CMAKE_PREFIX_PATH "/opt/Entwicklung/Qt/6.10.1/gcc_64/")
endif()

add_subdirectory(library/lib-datad)
add_subdirectory(library/lib-db)
add_subdirectory(library/lib-geo)
add_subdirectory(library/lib-jsonrpc)
add_subdirectory(wm-lib)
add_subdirectory(wm-ui)

and of the subproject:

cmake_minimum_required(VERSION 3.16)

set(LIB "datad")
set(LIBDEF "LIBDATAD_LIBRARY")

message("CMAKE fuer project: lib" ${LIB})

project(lib-${LIB} VERSION 1.0.0 LANGUAGES CXX)

find_package(Qt6 COMPONENTS Core REQUIRED)
find_package(Qt6 COMPONENTS Qml  REQUIRED)

include_directories("source/")
include_directories("source/helper")

set(SOURCES
    source/data-decorator.cpp
    source/bool-decorator.cpp
    source/float-decorator.cpp
    source/int-decorator.cpp
    source/string-decorator.cpp
    source/enumerator-decorator.cpp
    source/dropdown.cpp
    source/helper/dropdown-value.cpp
    source/helper/koordinaten.cpp
    source/string_bool-decorator.cpp
    source/koordinaten-decorator.cpp
    source/attribute-decorator.cpp

    source/lib-datad_global.h
    source/data-decorator.h
    source/bool-decorator.h
    source/float-decorator.h
    source/int-decorator.h
    source/string-decorator.h
    source/enumerator-decorator.h
    source/dropdown.h
    source/helper/dropdown-value.h
    source/string_bool-decorator.h
    source/koordinaten-decorator.h
    source/attribute-decorator.h
    source/helper/koordinaten.h
)

add_library(${LIB} ${LIBTYP} ${SOURCES})

target_link_libraries(
    ${LIB}
        Qt6::Core
    )

target_compile_definitions(${LIB} PRIVATE ${LIBDEF})
target_compile_definitions(${LIB} PUBLIC "QT_DEPRECATED_WARNINGS")