Sample CMakeLists.txt for C++23

CMakeLists.txt

cmake_minimum_required(VERSION 3.20)
project(project LANGUAGES CXX)

set(CMAKE_VERBOSE_MAKEFILE TRUE)
set(CMAKE_CXX_STANDARD 23)
set(CMAKE_CXX_EXTENSIONS ON)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_LIST_DIR}/bin/)
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_CURRENT_LIST_DIR}/bin/)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_CURRENT_LIST_DIR}/bin/)

set(COMMON_FLAGS
        -Os -Wall -Wextra
        -ffunction-sections -fdata-sections
        -fwhole-program -D __whopr__
        -fno-asynchronous-unwind-tables -fno-unwind-tables
        -fno-plt -fno-ident
        -march=native
)

add_compile_options(
        ${COMMON_FLAGS}
        -fno-rtti #-fno-exceptions
)
add_link_options(
        ${COMMON_FLAGS}
        -Wl,-z,norelro -Wl,-s -Wl,--build-id=none
)

file(GLOB_RECURSE SRC src/*.cc)

add_executable(project ${SRC})
add_custom_command(
        TARGET project
        PRE_BUILD
        COMMAND mkdir -p ${CMAKE_CURRENT_LIST_DIR}/bin/ && rm -rf ${CMAKE_CURRENT_LIST_DIR}/bin/*
)

target_include_directories(project PRIVATE inc)

Make it public!