Use cmake to write qt programs in CLion, can not compile.

senmx

I use cmake to write qt programs in CLion, but cannot
#include <QGuiApplication>
only
#include <qt/QtCore/QGuiApplication>
and also cannot compile.
After the qt installation, the header files are in /usr/include/qt

My CMakeLists.txt:

cmake_minimum_required(VERSION 3.15)
project(cmake_test)

set(CMAKE_CXX_STANDARD 14)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTORCC ON)
set(CMAKE_PREFIX_PATH ${CMAKE_PREFIX_PATH} $ENV{QT_DIR})

find_package(Qt5 COMPONENTS Core Quick Qml Sql REQUIRED)
find_package(Qt5QuickCompiler)

aux_source_directory(. SRC_LIST)
add_subdirectory(a)

qtquick_compiler_add_resources(RESOURCES qml.qrc)

add_executable(cmake_test ${SRC_LIST} ${RESOURCES})
target_link_libraries(${PROJECT_NAME} a)

CMAKE_PREFIX_PATH and QT_DIR are empty.

Project tree:

cmake_test/
├── a
│   ├── a.cpp
│   ├── a.h
│   └── CMakeLists.txt
├── CMakeLists.txt
└── main.cpp

Christian Ehrlicher

You also have to add the Qt libraries to your target with TARGET_LINK_LIBRARIES: https://doc.qt.io/qt-5/cmake-manual.html

senmx

@Christian-Ehrlicher Thanks, now it works.

target_link_libraries(${PROJECT_NAME} Qt5::Core Qt5::Quick Qt5::Qml Qt5::Sql a)

But, if I use the qt module in the subdirectory, this problem also occurs in the subdirectory, and adding find_package to the sub CMakeLists.txt does not seem to work.

a/CMakeLitsts.txt:

aux_source_directory(. DIR_LIB_SRCS)
find_package(Qt5 COMPONENTS Core Quick Qml Sql REQUIRED)
add_library(a ${DIR_LIB_SRCS})

Christian Ehrlicher

There is no need to call find_package() more than once

senmx

Well, this line was originally not added, but cannot include qt module, and it is ok in main.cpp.

a.cpp:

#include <iostream>
#include <QDebug> // Cannot include
#include "a.h"

void a() {
    std::cout << "aaa" << std::endl;
    qDebug() << "xxxx";
}

Christian Ehrlicher

@senmx said in Use cmake to write qt programs in CLion, can not compile.:

Well, this line was originally not added, but cannot include qt module, and it is ok in main.cpp.

Again: You also have to add the Qt libraries to your target with TARGET_LINK_LIBRARIES

You don't do this for your target!

senmx

@Christian-Ehrlicher Thanks!