QT minimal example with both make and cmake

!README.md

QT minimal example

Minimal QT example tested on Windows WSL2 Ubuntu 20.04.

Requirements

sudo apt update
sudo apt install qt5-default cmake
sudo apt install qtbase5-dev

Building options

The project provides instructions to build the GuiApp using make or cmake. All instructions assume you start at the project's root.

Cmake

mkdir build
cd build
cmake ..
make
./build/MinimalQt5App

Make

make
./build_make/MinimalQt5App

If header files are not found, you can use the following command to find the correct path:

find /usr/include/ -type f -name "*.h" -path "*/qt5/*"

Resources

• Compile QT with make file (GIST)
• https://stackoverflow.com/questions/48767576/how-to-get-my-makefile-based-c-project-to-work-with-qt-library-shortest-and-si
• https://stackoverflow.com/questions/38296756/what-is-the-idiomatic-way-in-cmake-to-add-the-fpic-compiler-option
• QT project from scratch with qmake

CMakeLists.txt

cmake_minimum_required(VERSION 3.5)

project(MinimalQt5App)

# Find the required Qt5 components
find_package(Qt5 REQUIRED Widgets)

# Add the executable
add_executable(${PROJECT_NAME} main.cpp)

# Link the Qt5 libraries to your application
target_link_libraries(${PROJECT_NAME} Qt5::Widgets)

main.cpp

#include <QApplication>
#include <QWidget>
#include <QPushButton>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    // Create a main window
    QWidget window;

    // Create a push button with text
    QPushButton button("Click me!", &window);

    // Set the size of the window
    window.resize(300, 200);

    // Show the window
    window.show();

    return app.exec();
}

Makefile

# Makefile for MinimalQt5App

# Compiler
CXX = g++

# Compiler flags
CXXFLAGS = -std=c++11

# Qt5 libraries and includes
QT_LIBS = -L/usr/lib/x86_64-linux-gnu -lQt5Quick  -lQt5PrintSupport -lQt5Qml -lQt5Network -lQt5Widgets -lQt5Gui -lQt5Core
QT_INCLUDES = -I/usr/include/x86_64-linux-gnu/qt5/ -I/usr/include/x86_64-linux-gnu/qt5/QtWidgets/ -I/usr/include/x86_64-linux-gnu/qt5/QtCore 

# Output directory for object files and executable
BUILD_DIR = build_make

# Source files
SRCS = main.cpp

# Object files
OBJS = $(addprefix $(BUILD_DIR)/,$(SRCS:.cpp=.o))

# Executable name
TARGET = MinimalQt5App

# Make rules
all: $(TARGET)

$(TARGET): $(OBJS)
	$(CXX) $(CXXFLAGS) -o $(BUILD_DIR)/$(TARGET) $(OBJS) $(QT_LIBS)

$(BUILD_DIR)/%.o: %.cpp
	@mkdir -p $(dir $@)
	$(CXX) $(CXXFLAGS) -c $< -o $@ $(QT_INCLUDES) -fPIC

clean:
	rm -rf $(BUILD_DIR)

.PHONY: all clean