Using a library via CPM.cmake

cmake_minimum_required(VERSION 3.28)
project(my-project)
include(cmake/CPM.cmake)
CPMAddPackage("gh:fmtlib/fmt#10.2.0")
add_executable(my-app main.cpp)
target_compile_features(my-app PRIVATE cxx_std_20)
target_link_libraries(my-app fmt::fmt)

#include <fmt/format.h>
int main() {
  fmt::print("Hello {}!\n", "Alan Turing");
  return 0;
}

cmake -B build
cmake --build build
./build/my-app
#=> Hello Alan Turing!

What is CPM.cmake?

CPM.cmake is a cross-platform CMake script that adds dependency management capabilities to CMake. It's built as a thin wrapper around CMake's FetchContent module that adds version control, caching, a simple API and more.

— CPM.cmake | GitHub

Quick installation instructions:

mkdir -p cmake
wget -O cmake/CPM.cmake https://github.com/cpm-cmake/CPM.cmake/releases/latest/download/get_cpm.cmake

include(cmake/CPM.cmake)
CPMAddPackage(...)

• Small and reusable projects CPM takes care of all project dependencies, allowing developers to focus on creating small, well-tested libraries.
• Cross-Platform CPM adds projects directly at the configure stage and is compatible with all CMake toolchains and generators.
• Reproducible builds By versioning dependencies via git commits or tags it is ensured that a project will always be buildable.
• Recursive dependencies Ensures that no dependency is added twice and all are added in the minimum required version.
• Plug-and-play No need to install anything. Just add the script to your project and you're good to go.
• No packaging required Simply add all external sources as a dependency.
• Simple source distribution CPM makes including projects with source files and dependencies easy, reducing the need for monolithic header files or git submodules.

— CPM.cmake | GitHub