[SOLVED] Build Failed Il2cpp

Unity Engine
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1

I wanted to optimize the size of my .apk file by exporting the scene I needed and import it to a clean project. All was fine no errors found in my project but it failed to build.

I did some googling and found that I have to remove the il2cpp things in my library folder but it won’t work.
Any help will be appreciated. Thanks!

2

This failure occurs because the code in the project has extern methods in C#. Methods marked as extern with a the [Dllimport(“__Internal”)] attribute must be present in a native library that is linked with the Unity player when building with the IL2CPP scripting backend.

For example, this in this project one function which causes this issue is named: UnityMC_Delegate_getEnabled

You have two options:

  1. Build a native library with all of the methods marked as extern with the [Dllimport(“__Internal”)] attribute for the target platform and architecture of the player. See this documentation for details about native plugins: Unity - Manual: Native plug-ins

  2. Remove the C# code which defines this extern method. You can do that with platform dependent compilation: Unity - Manual: Conditional compilation

3

Thanks for your help! I’m not sure which one to remove but you mentioned UnityMC_Delegate_getEnabled and then I googled it and I found this. He mentioned about the multipeer folder and it’s related to iOS so I did this to every scripts which has DllImport inside it.

But it gives me some error like below when I build it

Seems like it tries to compile but can’t find the code.
I also tried to just removed it. It build successfully but when I tried it, the screen is black but the system actually tracking the surface because the points showed up and I can tap it to show the object.

*EDIT
I changed to this and the errors gone.

But still black screen when I tried it.