class "has not been declared" in moc file though in class include is correct.

[lanigb]

Hi all,
I am porting a project from QT4 to Qt6...
At compile time, I got the following error:

/home/alain/devel/ot2-src-1.1/build/Desktop_Qt_6_9_3-Debug/src/ot2_autogen/EWIEGA46WW/moc_otpicdisplay.cpp:38: erreur : ‘OTPicDisplay’ has not been declared
In file included from /home/alain/devel/ot2-src-1.1/build/Desktop_Qt_6_9_3-Debug/src/ot2_autogen/mocs_compilation.cpp:42:
/home/alain/devel/ot2-src-1.1/build/Desktop_Qt_6_9_3-Debug/src/ot2_autogen/EWIEGA46WW/moc_otpicdisplay.cpp:38:35: error: ‘OTPicDisplay’ has not been declared
   38 | template <> constexpr inline auto OTPicDisplay::qt_create_metaobjectdata<qt_meta_tag_ZN12OTPicDisplayE_t>()

  |                                   ^~~~~~~~~~~~

The moc file does contains

#include "../../../../../src/otpicdisplay.h"

and OTPicDisplay contains the macro

class OTPicDisplay : public  OTListViewItem
{
  Q_OBJECT

What puzzles me above all, it that it fails only for one class, all the other classes with Q_OBJECT have no problems. Any insight ?

[Christian Ehrlicher]

@lanigb said in class "has not been declared" in moc file though in class include is correct.:

Any insight ?

You added the moc include in your header maybe.

[lanigb]

@Christian-Ehrlicher
Thanks for your answer but his is not the case. I tried to include part of the header but was flagged a s "spam".

[SGaist]

Hi,

Can you share the full implementation of OTPicDisplay as well as OTListViewItem ?

[lanigb]

I will try in the next post, if you don't see it is because it is flagged as spam.

[lanigb]

Was marked as spam.
http://alainbe.free.fr/qt/otpicdisplay.h
http://alainbe.free.fr/qt/otpicdisplay.cpp
http://alainbe.free.fr/qt/otlistviewitem.h
http://alainbe.free.fr/qt/otlistviewitem.cpp

[SGaist]

Are you using a .pro file ?

[lanigb]

No, CMakeList.txt

cmake_minimum_required(VERSION 3.22)

# Nom de l’exécutable final
set(TARGET_NAME ot2)

# Activer les outils automatiques de Qt
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTORCC ON)

# Encodage par défaut
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

# Trouver Qt6 et ses modules nécessaires
find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets Sql Xml PrintSupport)

# Récupération des fichiers
file(GLOB_RECURSE PROJECT_SOURCES
    "*.cpp"
    "*.h"
    "*.ui"
    "*.qrc"
)

# Création de l’exécutable
qt_add_executable(${TARGET_NAME}
    ${PROJECT_SOURCES}
)

# Lien avec les bibliothèques Qt nécessaires
target_link_libraries(${TARGET_NAME}
    PRIVATE
        Qt6::Core
        Qt6::Gui
        Qt6::Widgets
        Qt6::Sql
        Qt6::Xml
        Qt6::PrintSupport
)

# Dossier de sortie
set_target_properties(${TARGET_NAME} PROPERTIES
    RUNTIME_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}/bin
)

# Inclure le répertoire courant (pour que les includes relatifs fonctionnent)
target_include_directories(${TARGET_NAME} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})

[SGaist]

I would suggest following the cmake getting started guide. There are some hints to simplify the content of your CMakeLists.txt file.

One of which is to not include the headers in the file list you pass to qt_add_executable.

[lanigb]

OK. Thanks for the link.

[lanigb]

I have rewritten the CMakeList.txt. For now, I don't know whether this point is better or not because I have new problems.