[Java.Interop] fix .NET 6 linker warnings #870
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Context: dotnet/android#5652 If you build a .NET 6 Android app: dotnet new android dotnet build -c Release -bl -p:SuppressTrimAnalysisWarnings=false You get warnings like: external\Java.Interop\src\Java.Interop\Java.Interop\JniRuntime.JniMarshalMemberBuilder.cs(53,4): warning IL2026: Java.Interop.JniRuntime.SetMarshalMemberBuilder(JniRuntime.CreationOptions): Using method 'System.Reflection.Assembly.GetType(String)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. Types might be removed. Adding this is not sufficient to fix the warning: [DynamicDependency (DynamicallyAccessedMemberTypes.PublicParameterlessConstructor, "Java.Interop.MarshalMemberBuilder", "Java.Interop.Export")] You also need to suppress `IL2026`: [UnconditionalSuppressMessage ("Trimming", "IL2026", Justification = "DynamicDependency should preserve the constructor.")] Then, because `Java.Interop.Export.dll` is not always included in apps, we also need to suppress: [UnconditionalSuppressMessage ("Trimming", "IL2035", Justification = "Java.Interop.Export.dll is not always present.")]
jonpryor
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Aug 25, 2021
jpobst
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Sep 30, 2021
Context: dotnet/android#5652 If you build a .NET 6 Android app: dotnet new android dotnet build -c Release -bl -p:SuppressTrimAnalysisWarnings=false You get warnings like: external\Java.Interop\src\Java.Interop\Java.Interop\JniRuntime.JniMarshalMemberBuilder.cs(53,4): warning IL2026: Java.Interop.JniRuntime.SetMarshalMemberBuilder(JniRuntime.CreationOptions): Using method 'System.Reflection.Assembly.GetType(String)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. Types might be removed. Adding this is not sufficient to fix the warning: [DynamicDependency (DynamicallyAccessedMemberTypes.PublicParameterlessConstructor, "Java.Interop.MarshalMemberBuilder", "Java.Interop.Export")] You also need to suppress [warning `IL2026`][0]: [UnconditionalSuppressMessage ("Trimming", "IL2026", Justification = "DynamicDependency should preserve the constructor.")] Then, because `Java.Interop.Export.dll` is not always included in apps [^0], we also need to suppress [warning IL2035][1]: [UnconditionalSuppressMessage ("Trimming", "IL2035", Justification = "Java.Interop.Export.dll is not always present.")] [0]: https://docs.microsoft.com/en-us/dotnet/core/deploying/trim-warnings/il2026 [1]: https://github.com/mono/linker/blob/66fd7119cd5744dd8bd37442ac74d2a326085406/docs/error-codes.md#il2035-unresolved-assembly-assemblyname-in-dynamicdependencyattribute [^0]: `Java.Interop.Export.dll` is not shipped as in Xamarin.Android as a "MonoAndroid-profile" assembly -- and likely shouldn't be shipped *at all* right now -- and thus will only reliably exist for the few people building xamarin/Java.Interop.
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Context: dotnet/android#5652
If you build a .NET 6 Android app:
You get warnings like:
Adding this is not sufficient to fix the warning:
You also need to suppress
IL2026:Then, because
Java.Interop.Export.dllis not always included inapps, we also need to suppress: