Basic CMakeLists.txt file with a basic project directory.

CMakeLists.basic.txt

# Basic CMakeLists.txt file with a basic project directory.
# project_dir
# |
# |-- include
# |-- src
#
cmake_minimum_required(VERSION 3.15)

project(MyProject)

set(SRC_DIR "${CMAKE_CURRENT_LIST_DIR}/src")
set(SOURCES "${SRC_DIR}/main.cpp" "${SRC_DIR}/file1.cpp" "${SRC_DIR}/file2.cpp")

add_executable(${PROJECT_NAME} ${SOURCES})

target_include_directories(${PROJECT_NAME} PRIVATE "${CMAKE_CURRENT_LIST_DIR}/include")

set_target_properties(${PROJECT_NAME} PROPERTIES
    CXX_STANDARD 20
    CXX_STANDARD_REQUIRED ON
    CXX_EXTENSIONS OFF
)