NativeAOT: Do not suppress trim warnings by default with NativeAOT

[ivanpovazan]

This PR enables trim warnings with NativeAOT by default.

In our current ILLink+ILC setup, we first need to suppress the warnings for ILLink, after which we need to enable them for ILC.
For this reason, setting up SuppressTrimAnalysisWarnings properly needs to happen very early as it will get overwritten by https://github.com/dotnet/runtime/blob/45acd380b37c9ee883070a70a2ef2cb7eca77683/src/tools/illink/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets#L54-L59

Verified with building an iOS application that the trim warnings are displayed only during ILC trimming (after Generating native code message below):

../dotnet publish -c Release -r ios-arm64 -bl /p:PublishAot=true /p:PublishAotUsingRuntimePack=true
MSBuild version 17.7.0+5785ed5c2 for .NET
  Determining projects to restore...
  Restored /Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj (in 127 ms).
/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/sdk/8.0.100-rc.1.23415.19/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.RuntimeIdentifierInference.targets(311,5): message NETSDK1057: You are using a preview version of .NET. See: https://aka.ms/dotnet-support-policy [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
  Detected signing identity:
          
    Code Signing Key: "Apple Development: Ivan Povazan (53PXX466YZ)" (3CC7B9372E3BB19DEBECBA95A6AF3E0EB26C5B29)
    Provisioning Profile: "iOS Team Provisioning Profile: *" (6e598984-dd21-4632-b707-72cfa247991d)
    Bundle Id: com.companyname.TrimTest
    App Id: SGGM6D27TK.com.companyname.TrimTest
  TrimTest -> /Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/bin/Release/net8.0-ios/ios-arm64/TrimTest.dll
/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/packs/Microsoft.iOS.Sdk/16.4.8777-ci.trim-warn/targets/Xamarin.Shared.Sdk.targets(1826,3): warning : The file '/Users/ivan/repos/xamarin/xamarin-macios/packages/microsoft.netcore.app.runtime.nativeaot.ios-arm64/8.0.0-rc.1.23414.4/runtimes/ios-arm64/native/libbootstrapper.o' does not specify a 'PublishFolderType' metadata, and a default value could not be calculated. The file will not be copied to the app bundle. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/packs/Microsoft.iOS.Sdk/16.4.8777-ci.trim-warn/targets/Xamarin.Shared.Sdk.targets(1826,3): warning : The file '/Users/ivan/repos/xamarin/xamarin-macios/packages/microsoft.netcore.app.runtime.nativeaot.ios-arm64/8.0.0-rc.1.23414.4/runtimes/ios-arm64/native/libbootstrapperdll.o' does not specify a 'PublishFolderType' metadata, and a default value could not be calculated. The file will not be copied to the app bundle. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/packs/Microsoft.iOS.Sdk/16.4.8777-ci.trim-warn/targets/Xamarin.Shared.Sdk.targets(536,3): warning : All assemblies must be processed by the linker when using NativeAOT. Please don't set neither the 'MtouchLink' nor the 'TrimMode' property, so that the build can default to linking all assemblies. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
  Optimizing assemblies for size may change the behavior of the app. Be sure to test after publishing. See: https://aka.ms/dotnet-illink
  Optimizing assemblies for size. This process might take a while.
  Generating native code
resource ILLink.LinkAttributes.xml in System.Private.CoreLib(335,8): warning IL2049: System.Private.CoreLib: The internal attribute name 'RemoveAttributeInstances' being used in the xml is not supported by ILLink, check the spelling and the supported internal attributes. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
resource ILLink.LinkAttributes.xml in System.Private.CoreLib(342,8): warning IL2049: System.Private.CoreLib: The internal attribute name 'RemoveAttributeInstances' being used in the xml is not supported by ILLink, check the spelling and the supported internal attributes. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
resource ILLink.LinkAttributes.xml in System.Private.CoreLib(349,8): warning IL2049: System.Private.CoreLib: The internal attribute name 'RemoveAttributeInstances' being used in the xml is not supported by ILLink, check the spelling and the supported internal attributes. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
resource ILLink.LinkAttributes.xml in System.Private.CoreLib(356,8): warning IL2049: System.Private.CoreLib: The internal attribute name 'RemoveAttributeInstances' being used in the xml is not supported by ILLink, check the spelling and the supported internal attributes. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
resource ILLink.LinkAttributes.xml in System.Private.CoreLib(363,8): warning IL2049: System.Private.CoreLib: The internal attribute name 'RemoveAttributeInstances' being used in the xml is not supported by ILLink, check the spelling and the supported internal attributes. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
resource ILLink.LinkAttributes.xml in System.Private.CoreLib(370,8): warning IL2049: System.Private.CoreLib: The internal attribute name 'RemoveAttributeInstances' being used in the xml is not supported by ILLink, check the spelling and the supported internal attributes. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/src/ObjCRuntime/Runtime.CoreCLR.cs(171): Trim analysis warning IL2026: ObjCRuntime.Runtime.ResolvingEventHandler(AssemblyLoadContext,AssemblyName): Using member 'System.Runtime.Loader.AssemblyLoadContext.LoadFromAssemblyPath(String)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. Types and members the loaded assembly depends on might be removed. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/src/ObjCRuntime/Runtime.CoreCLR.cs(267): Trim analysis warning IL2026: ObjCRuntime.Runtime.FindAssembly(IntPtr): Using member 'System.Reflection.Assembly.LoadFrom(String)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. Types and members the loaded assembly depends on might be removed. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/obj/Release/net8.0-ios/ios-arm64/linked/Microsoft.iOS.dll : warning IL3053: Assembly 'Microsoft.iOS' produced AOT analysis warnings. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/obj/Release/net8.0-ios/ios-arm64/linked/Microsoft.iOS.dll : warning IL2104: Assembly 'Microsoft.iOS' produced trim warnings. For more information see https://aka.ms/dotnet-illink/libraries [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
  Created the package: bin/Release/net8.0-ios/ios-arm64/publish//TrimTest.ipa

---

Fixes: #18571

[filipnavara]

Only two Trim analysis warnings? That's suspicious. Although we resolved some of the issues listed in #18629 there are some which clearly were not fixed, eg. use of Marshal methods here. Does it omit warnings about those calls because they were trimmed?

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[ivanpovazan]

@filipnavara "only two" is because we are still using -p:TrimmerSingleWarn=true I mentioned that here: #18571 (comment) but it was argued (later in the thread) that for user experience we shouldn't -p:TrimmerSingleWarn=false by default.

For the reference here is the build log produced with -p:TrimmerSingleWarn=false included:

Generating native code
resource ILLink.LinkAttributes.xml in System.Private.CoreLib(335,8): warning IL2049: System.Private.CoreLib: The internal attribute name 'RemoveAttributeInstances' being used in the xml is not supported by ILLink, check the spelling and the supported internal attributes. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
resource ILLink.LinkAttributes.xml in System.Private.CoreLib(342,8): warning IL2049: System.Private.CoreLib: The internal attribute name 'RemoveAttributeInstances' being used in the xml is not supported by ILLink, check the spelling and the supported internal attributes. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
resource ILLink.LinkAttributes.xml in System.Private.CoreLib(349,8): warning IL2049: System.Private.CoreLib: The internal attribute name 'RemoveAttributeInstances' being used in the xml is not supported by ILLink, check the spelling and the supported internal attributes. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
resource ILLink.LinkAttributes.xml in System.Private.CoreLib(356,8): warning IL2049: System.Private.CoreLib: The internal attribute name 'RemoveAttributeInstances' being used in the xml is not supported by ILLink, check the spelling and the supported internal attributes. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
resource ILLink.LinkAttributes.xml in System.Private.CoreLib(363,8): warning IL2049: System.Private.CoreLib: The internal attribute name 'RemoveAttributeInstances' being used in the xml is not supported by ILLink, check the spelling and the supported internal attributes. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
resource ILLink.LinkAttributes.xml in System.Private.CoreLib(370,8): warning IL2049: System.Private.CoreLib: The internal attribute name 'RemoveAttributeInstances' being used in the xml is not supported by ILLink, check the spelling and the supported internal attributes. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/src/ObjCRuntime/Runtime.CoreCLR.cs(171): Trim analysis warning IL2026: ObjCRuntime.Runtime.ResolvingEventHandler(AssemblyLoadContext,AssemblyName): Using member 'System.Runtime.Loader.AssemblyLoadContext.LoadFromAssemblyPath(String)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. Types and members the loaded assembly depends on might be removed. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/src/ObjCRuntime/Runtime.CoreCLR.cs(267): Trim analysis warning IL2026: ObjCRuntime.Runtime.FindAssembly(IntPtr): Using member 'System.Reflection.Assembly.LoadFrom(String)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. Types and members the loaded assembly depends on might be removed. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/src/ObjCRuntime/Runtime.CoreCLR.cs(471): AOT analysis warning IL3050: ObjCRuntime.Runtime.StructureToPtr(Object,IntPtr): Using member 'System.Runtime.InteropServices.Marshal.StructureToPtr(Object,IntPtr,Boolean)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. Marshalling code for the object might not be available. Use the StructureToPtr<T> overload instead. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/src/ObjCRuntime/Runtime.CoreCLR.cs(640): AOT analysis warning IL3050: ObjCRuntime.Runtime.SizeOf(Type): Using member 'System.Runtime.InteropServices.Marshal.SizeOf(Type)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. Marshalling code for the object might not be available. Use the SizeOf<T> overload instead. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/src/ObjCRuntime/Runtime.CoreCLR.cs(827): AOT analysis warning IL3050: ObjCRuntime.Runtime.CreateArray(Runtime.MonoObject*,UInt64): Using member 'System.Array.CreateInstance(Type,Int32)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. The code for an array of the specified type might not be available. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/src/ObjCRuntime/Runtime.CoreCLR.cs(952): AOT analysis warning IL3050: ObjCRuntime.Runtime.PtrToStructure(IntPtr,Type): Using member 'System.Runtime.InteropServices.Marshal.PtrToStructure(IntPtr,Type)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. Marshalling code for the object might not be available. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/src/ObjCRuntime/Runtime.cs(1106): AOT analysis warning IL3050: ObjCRuntime.Runtime.GetDelegateForBlock(IntPtr,Type): Using member 'System.Runtime.InteropServices.Marshal.GetDelegateForFunctionPointer(IntPtr,Type)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. Marshalling code for the delegate might not be available. Use the GetDelegateForFunctionPointer<TDelegate> overload instead. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/src/ObjCRuntime/Runtime.cs(1219): Trim analysis warning IL2075: ObjCRuntime.Runtime.FindPropertyInfo(MethodInfo): 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.PublicProperties' in call to 'System.Type.GetProperties()'. The return value of method 'System.Reflection.MemberInfo.DeclaringType.get' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/src/ObjCRuntime/Runtime.cs(1413): Trim analysis warning IL2070: ObjCRuntime.Runtime.GetIntPtrConstructor(Type): 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.PublicConstructors', 'DynamicallyAccessedMemberTypes.NonPublicConstructors' in call to 'System.Type.GetConstructors(BindingFlags)'. The parameter '#0' of method 'ObjCRuntime.Runtime.GetIntPtrConstructor(Type)' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/src/ObjCRuntime/Runtime.cs(1458): Trim analysis warning IL2070: ObjCRuntime.Runtime.GetIntPtr_BoolConstructor(Type): 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.PublicConstructors', 'DynamicallyAccessedMemberTypes.NonPublicConstructors' in call to 'System.Type.GetConstructors(BindingFlags)'. The parameter '#0' of method 'ObjCRuntime.Runtime.GetIntPtr_BoolConstructor(Type)' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/src/ObjCRuntime/Runtime.cs(2202): Trim analysis warning IL2070: ObjCRuntime.Runtime.FindClosedMethod(Type,MethodBase): 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.PublicMethods', 'DynamicallyAccessedMemberTypes.NonPublicMethods' in call to 'System.Type.GetMethods(BindingFlags)'. The parameter '#0' of method 'ObjCRuntime.Runtime.FindClosedMethod(Type,MethodBase)' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/src/ObjCRuntime/Blocks.cs(223): AOT analysis warning IL3050: ObjCRuntime.BlockLiteral.SetupBlockImpl(Delegate,Delegate,Boolean,Byte[]): Using member 'System.Runtime.InteropServices.Marshal.GetFunctionPointerForDelegate(Delegate)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. Marshalling code for the delegate might not be available. Use the GetFunctionPointerForDelegate<TDelegate> overload instead. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/src/ObjCRuntime/Blocks.cs(415): Trim analysis warning IL2075: ObjCRuntime.BlockLiteral.GetDelegateProxyType(MethodInfo,UInt32,MethodInfo&): 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.Interfaces' in call to 'System.Type.GetInterfaces()'. The return value of method 'System.Reflection.MemberInfo.DeclaringType.get' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/src/ObjCRuntime/Blocks.cs(419): Trim analysis warning IL2062: ObjCRuntime.BlockLiteral.GetDelegateProxyType(MethodInfo,UInt32,MethodInfo&): Value passed to parameter 'interfaceType' of method 'System.Type.GetInterfaceMap(Type)' can not be statically determined and may not meet 'DynamicallyAccessedMembersAttribute' requirements. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/src/ObjCRuntime/Blocks.cs(502): Trim analysis warning IL2075: ObjCRuntime.BlockLiteral.GetBlockForDelegate(MethodInfo,Object,UInt32,String): 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.NonPublicMethods' in call to 'System.Type.GetMethod(String,BindingFlags)'. The return value of method 'ObjCRuntime.BlockLiteral.GetDelegateProxyType(MethodInfo,UInt32,MethodInfo&)' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/src/ObjCRuntime/Blocks.cs(507): Trim analysis warning IL2075: ObjCRuntime.BlockLiteral.GetBlockForDelegate(MethodInfo,Object,UInt32,String): 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.NonPublicFields' in call to 'System.Type.GetField(String,BindingFlags)'. The return value of method 'ObjCRuntime.BlockLiteral.GetDelegateProxyType(MethodInfo,UInt32,MethodInfo&)' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
/Users/ivan/repos/xamarin/xamarin-macios/src/ObjCRuntime/Runtime.CoreCLR.cs(450): AOT analysis warning IL3050: ObjCRuntime.Runtime.MarshalStructure<T>(!!0): Using member 'System.Runtime.InteropServices.Marshal.SizeOf(Type)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. Marshalling code for the object might not be available. Use the SizeOf<T> overload instead. [/Users/ivan/repos/xamarin/xamarin-macios/builds/downloads/dotnet-sdk-8.0.100-rc.1.23415.19/TrimTest/TrimTest.csproj]
  Created the package: bin/Release/net8.0-ios/ios-arm64/publish//TrimTest.ipa

which I believe matches what you suspected.

[filipnavara]

which I believe matches what you suspected.

Yep, that looks about right (the Marshal calls are easy to fix low-hanging fruit).