iOS 64-bit support is implemented with the scripting backend called IL2CPP. It runs with your C# code.
The IL2CPP runtime combines an ahead of time compiler with a virtual machine to convert assemblies to C++ while leveraging standard platform C++ compilers to produce native binaries. The net result is significantly higher performance, platform compatibility and maintainability.
IL2CPP is the only scripting backend to support deploying to ARM 64-bit on iOSApple’s mobile operating system. More info
See in Glossary, and is thus mandatory to deploy to the Apple App Sstore for releasing new apps.
To read more about IL2CPP, see the blog posts The future of scripting in Unity and Apple iOS 64-bit support in Unity.
Select IL2CPPA Unity-developed scripting back-end which you can use as an alternative to Mono when building Projects for some platforms. More info
See in Glossary in the Scripting BackendA framework that powers scripting in Unity. Unity supports three different scripting backends depending on target platform: Mono, .NET and IL2CPP. Universal Windows Platform, however, supports only two: .NET and IL2CPP. More info
See in Glossary drop-down menu on the Player window.
By default it will build for Universal architecture (including both ARM64 and ARMv7); if needed you can switch to specific architecture on the Player window. There are a number of things that should be done before your application is up and running in 64-bits:
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