Could not AOT the assembly of my App

Question

Hello,

I have an app written in xamarin forms, targeting xamarin.android and xamarin.iOS. Since the UIWebView deprecation https://devblogs.microsoft.com/xamarin/uiwebview-deprecation-xamarin-forms/, I have upgraded my app from Xamarin Forms 3.0 to Xamarin.Forms 5.0.

Now I get the following error when deploying in Release for AppStore (in debug everything works fine since the compilation is JIT):

C:\cicdev\Microsoft Visual Studio\2019\Enterprise\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(421,3): error MT3001: Could not AOT the assembly '/Users/idboxrt/Library/Caches/Xamarin/mtbs/builds/IDboxMobile.iOS/e86aa7b5295e9875bca66b5cd69c66e6eb0c2469c92d74f31f9c313ee00733b4/obj/iPhone/ReleaseTemp/mtouch-cache/3-Build/IDboxMobile.dll'

IDboxMobile.dll is the dll of my NetStandard shared application which targets my IDboxMobile.iOS target.

I attach the log in a .zip (please change the .txt to .zip in the attached file)

I have updated xamarin.iOS, xcode and visual studio to their latest versions today. Thge Supported Architecture is ARM64. I tried to change the linker options, LLVM, Enable Mono Interpreter, and so on.

Also put the verbosity of the log attached in "-v -v -v -v", but I cannot get more info about the AOT, just that it fails.

Thank you very much in advance.

Answer 1

Hello,​

Welcome to our Microsoft Q&A platform!

IOS applications have had a number of limitations when running on a device. Even using Ahead of Time” (AOT), It can also restrict a number of C# features from being used. To avoid this, try using the interpreter function.

Check the tutorial: https://devblogs.microsoft.com/xamarin/introducing-xamarin-ios-interpreter/

Someone faced the similar problem and solved the issue by configuring the MtouchExtraArgs tag.

   <MtouchExtraArgs>--interpreter=the_assembly ...</MtouchExtraArgs>  
   <MtouchInterpreter>-all</MtouchInterpreter>  
     
   //or  
   <MtouchExtraArgs>--linkskip=the_assembly  ...</MtouchExtraArgs>  

Please check: https://stackoverflow.com/a/65809789/11083277

Best Regards,

Jarvan Zhang

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