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marshal-ilgen component should be optional #7276
Description
Android application type
Android for .NET (net6.0-android, etc.)
Affected platform version
.NET 7
Description
With #7249 and #7260, the marshal-ilgen component is always included into Android apps.
For .NET 8 (?), we should try to make inclusion of this component optional, such that it is included only if required.
As a prerequisite, this will require:
- updating
Mono.Androi.dllandJava.Interop.dll(and others?) to use theDllImport Generator. - Updating the above assemblies to have
[assembly:DisableRuntimeMarshallingAttribute]
Then, we'd need to update the App Build process to scan all included assemblies, and if all included assemblies contain [assembly:DisableRuntimeMarshallingAttribute], then the marshal-ilgen component can be removed from the .apk.
Activity
[Xamarin.Android.Build.Tasks] Use marshal-ilgen component (dotnet#7260)
dellis1972 commentedon Aug 18, 2022
So is the plan for users to add this attribute to their own assemblies? I assume this will only need to check on assemblies which reference Mono.Android? or does it apply to every single assembly ?
jonpryor commentedon Aug 18, 2022
@dellis1972 asked:
My interpretation is that yes, any/every assembly which contains P/Invokes would need to opt-in to this new mechanism by adding
[assembly:DisableRuntimeMarshallingAttribute]. This would not be restricted to just assemblies which referenceMono.Android.dll.Which possibly raises as many questions as that answers. How does one efficiently tell if an assembly contains no P/Invokes?
[Java.Interop] Add JniMemberInfoLookup
[Java.Interop] Add JniMemberInfoLookup
jonathanpeppers commentedon Aug 7, 2026
Automated bot note: closing this issue as obsolete for .NET 11. .NET for Android supports CoreCLR in .NET 11, and the Mono marshal-ilgen component is not packaged in CoreCLR applications (it appears only in MonoVM APK baselines). Consequently, adding [DisableRuntimeMarshalling] to Mono.Android.dll or Java.Interop.dll would not provide the APK-size/component-removal benefit described by this issue for the supported runtime.