C++ 23 cheatsheet

C++ 23: CMake

7 common C++ 23 tasks.

A minimal CMakeLists.txt

A project with C++23 and one executable target.

cmake_minimum_required(VERSION 3.20)
project(app LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 23)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

add_executable(app main.cpp util.cpp)

Configure a build

Generate the build system in a separate build folder. Release mode turns on optimization.

cmake -S . -B build -DCMAKE_BUILD_TYPE=Release

Build the project

Compile using the generated build system, in parallel.

cmake --build build -j

Run the tests

Run the tests registered with add_test and print output for failures.

ctest --test-dir build --output-on-failure

Export compile commands

Write compile_commands.json, which editors and clang-tidy use.

cmake -S . -B build -DCMAKE_EXPORT_COMPILE_COMMANDS=ON

Link a library

Link a target against another target or an installed package.

find_package(fmt REQUIRED)
target_link_libraries(app PRIVATE fmt::fmt)

Download a dependency

Fetch and build a dependency such as GoogleTest at configure time.

include(FetchContent)
FetchContent_Declare(googletest
  URL https://github.com/google/googletest/archive/refs/tags/v1.15.2.zip)
FetchContent_MakeAvailable(googletest)