CMake vs Meson: C/C++ Build Systems
CMake is the de facto C/C++ build generator with enormous ecosystem support; Meson is a newer system focused on speed and a cleaner syntax.
CMake generates native build files (Make, Ninja, IDE projects) and is supported by nearly every C/C++ library and IDE, but its scripting language is notoriously idiosyncratic. Meson uses a clean, Python-like DSL, defaults to the fast Ninja backend, and emphasizes sensible defaults and quick configure times. CMake wins on reach and tooling; Meson wins on ergonomics and configuration speed.
| CMake | Meson | |
|---|---|---|
| Adoption | De facto standard | Growing |
| Syntax | Idiosyncratic | Clean, Python-like |
| Backend | Make/Ninja/IDE | Ninja (default) |
| Configure speed | Slower | Fast |
| Best for | Max ecosystem/IDE support | New projects, clean builds |
In CI
CMake fits when you must integrate with the broad C/C++ ecosystem, package managers (vcpkg, Conan), and IDEs. Meson configures faster and is pleasant for new projects, especially with Ninja. Both cache compiled objects well; CMake is the safer default for interop, Meson for greenfield ergonomics.
Speed it up
Cache the build directory and use ccache/sccache to reuse compiled objects between runs. Both build on CI runners; faster managed runners shorten configure and compile steps.
The verdict
Needing maximum ecosystem, package-manager, and IDE support: CMake. Starting a new C/C++ project and valuing clean syntax with fast configures: Meson. Many established codebases stay on CMake for interop; new projects increasingly pick Meson.