Cmake and Qt5 linking error

Question

I'm trying to build a Qt5 project with Cmake in order to add some new librairies. The cmake goes well but I have a linking issue when building :

Linking CXX executable bin/qGo
CMakeFiles/qGo.dir/src/main.cpp.o: dans la fonction « main »:
main.cpp:(.text+0x102b): undefined reference to « qInitResources_application() »
collect2: error: ld returned 1 exit status
make[2]: *** [bin/qGo] Erreur 1
make[1]: *** [CMakeFiles/qGo.dir/all] Erreur 2
make: *** [all] Erreur 2

Here is my CMakeLists.txt :

cmake_minimum_required(VERSION 2.8.11)

project (qGo)

SET(CMAKE_MODULE_PATH /usr/local/lib/cmake/)

# Répertoire d'installation de Qt5 (dépend de l'installation)
SET(CMAKE_PREFIX_PATH "~/Qt/5.4/gcc/")

find_package (OpenCV REQUIRED)
find_package (aruco REQUIRED)

# Find includes in corresponding build directories
set(CMAKE_INCLUDE_CURRENT_DIR ON)
# Instruct CMake to run moc automatically when needed.
set(CMAKE_AUTOMOC ON)
# Use moc files in the bin folder
SET(CMAKE_INCLUDE_CURRENT_DIR ON)

# Find the Qt5 components
find_package(Qt5Core)
find_package(Qt5Widgets)
find_package(Qt5Network)
find_package(Qt5Multimedia)

set(EXECUTABLE_OUTPUT_PATH bin)
SET(CMAKE_CXX_FLAGS "-std=c++11")

include_directories(src)
include_directories(src/audio)
include_directories(src/board)
include_directories(src/game_interfaces)
include_directories(src/game_tree)
include_directories(src/gtp)
include_directories(src/network)
include_directories(src/resources)
include_directories(src/sgf)
include_directories(src/translations)

file(
        GLOB_RECURSE
        source_files
        src/*
)

file(
        GLOB_RECURSE
        ui_files
        src/*.ui
)

file(
        GLOB_RECURSE
        header_files
        src/*.h
        src/*.hpp
)

QT5_WRAP_UI(header_ui ${ui_files})

# Tell CMake to create the helloworld executable
add_executable(qGo ${source_files} ${header_ui})

# Use the Widgets module from Qt 5.
target_link_libraries(qGo Qt5::Core Qt5::Widgets Qt5::Network Qt5::Multimedia ${OpenCV_LIBS} ${aruco_LIBS})

I have also tried to add libraries with ${Qt5Widgets_INCLUDES} or ${Qt5Widgets_DEFINITIONS} but it did the same.

I've also tried to compile with QtCreator and it works so the problem is with cmake.

Maybe you also need to link Qt5::Gui. And enable automoc in CMake. Another thing that happens on some IDEs (Xcode for example) is: If you add the Q_OBJECT macro somewhere, you have to run CMake manually to generate the correspondig .moc file before compilation. — qCring
– qCring, Commented Jun 14, 2015 at 16:55
automoc is enabled in my CMakeLists.txt no ? I've tried to add some other modules (like Gui) but it did the same. For compiling, I've created an empty folder so it's a "fresh" compilation. — Kiraho
– Kiraho, Commented Jun 14, 2015 at 17:15
I just read about the same linker error here and it looks like it's an RCC issue (Qt resource file generation). You can enable autorcc just like automoc. Maybe that helps — qCring
– qCring, Commented Jun 14, 2015 at 19:06

tbraun89 · Accepted Answer · 2015-06-14 21:04:00Z

2

I think you forget to append moc and resources to your executable use qt5_wrap_cpp() for mocs use qt5_add_resources() for resources.

Then you must append vars to add_executable check out this link.

edited Jun 14, 2015 at 21:04

tbraun89

2,2343 gold badges26 silver badges47 bronze badges

answered Jun 14, 2015 at 19:42

seiko

361 bronze badge

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1 Comment

Kiraho Over a year ago

That solved my problem : I've missed to add .qrc files with qt5_add_resources(). But qt5_wrap_cpp() wasn't necessary thanks to automoc.

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