CMake shows console - qt

Question

I made an app and when I run in QtCreator everything goes well, my question is when I generate the release, a consola is shown along with my app, why does this happen, and how can I avoid it.
Here my code.
#include "mainwindow.h"
#include "./ui_mainwindow.h"
#include <QMessageBox>
#include <QSqlDatabase>
#include <QSqlError>
#include <QSqlTableModel>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent), ui(new Ui::MainWindow)
{
ui->setupUi(this);
QSqlDatabase db=QSqlDatabase::addDatabase("QPSQL");
if(!db.isDriverAvailable("QPSQL")){
QMessageBox::critical(this,qApp->applicationName(),db.lastError().text());
return;
}
db.setDatabaseName("covid");
db.setHostName("localhost");
db.setPassword("2311046");
db.setPort(5432);
db.setUserName("postgres");
if(!db.open()){
QMessageBox::critical(this,qApp->applicationName(),db.lastError().text());
return;
}
QMessageBox::information(this,qApp->applicationName(),"Todo bien");
}
MainWindow::~MainWindow()
{
delete ui;
}
CMakeLists.txt:
cmake_minimum_required(VERSION 3.5)
project(untitled1 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 http://doc.qt.io/qt-5/deployment-android.html for more information.
# They need to be set before the find_package(Qt5 ...) call.
#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)
find_package(Qt5 COMPONENTS Sql REQUIRED)
if(ANDROID)
add_library(untitled1 SHARED
main.cpp
mainwindow.cpp
mainwindow.h
mainwindow.ui
)
else()
add_executable(untitled1
main.cpp
mainwindow.cpp
mainwindow.h
mainwindow.ui
)
endif()
target_link_libraries(untitled1 PRIVATE Qt${QT_VERSION_MAJOR}::Widgets)
target_link_libraries(untitled1 PUBLIC Qt${QT_VERSION_MAJOR}::Sql)
Here I show the Windows that are shown every time I run the .exe:

Answer 1

This should be quite simple. Just add:
# ...
set(CMAKE_CXX_STANDARD_REQUIRED ON)
# Make sure we build executables as GUI apps, rather than console apps, on Windows
set(CMAKE_WIN32_EXECUTABLE TRUE)
# ...
As the documentation explains:
When [WIN32_EXECUTABLE] is set to true the executable when linked on Windows will be created with a WinMain() entry point instead of just main(). This makes it a GUI executable instead of a console application. [...] This property is initialized by the value of the CMAKE_WIN32_EXECUTABLE variable if it is set when a target is created.