Version: 2019.4
Windows Runtime support
Optimizing IL2CPP build times

How IL2CPP works

Upon starting a build using IL2CPP, Unity automatically performs the following steps:

  1. Compiles Unity Scripting API code to regular .NET DLLs (managed assemblies).

  2. Applies managed bytecode stripping. This step significantly reduces the size of a built game.

  3. Converts all managed assemblies to standard C++ code.

  4. Compiles the generated C++ code and the runtime part of IL2CPP with a native platform compiler.

  5. Links the code into either an executable file or a DLL, depending on the platform you are targeting.

A diagram of the automatic steps taken when building a project using IL2CPP
A diagram of the automatic steps taken when building a project using IL2CPP

IL2CPP provides a few useful options which you can control by attributes in your scripts. See documentation on Platform-dependent compilation for further information.

Windows Runtime support
Optimizing IL2CPP build times
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