Using any C++ library in Godot

Godot engine can integrate C++ libraries through GDExtension and godot-cpp bindings, allowing developers to use existing C/C++ code alongside GDScript without recompiling the engine. The main challenge is managing build compatibility across different platforms and Godot versions, which can be simplified using tools like Conan package manager and godot-cpp 10. An example demonstrates using the flecs Entity Component System library to simulate 100,000 particles in Godot.