[Foundation] Suppress trimmer warnings for NSObject.DynamicConformsTo…

…Protocol members. (#20333)

Contributes towards #10405.

src/Foundation/NSObject2.cs

@@ -541,9 +541,15 @@ public virtual bool ConformsToProtocol (NativeHandle protocol)
 			}
 		}
 
+#if NET
+		// Note that this method does not work with NativeAOT, so throw an exception in that case.
+		// IL2075: 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.Interfaces' in call to 'System.Type.GetInterfaces()'. The return value of method 'System.Object.GetType()' 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.
+		[UnconditionalSuppressMessage ("", "IL2075", Justification = "The APIs this method tries to access are marked by other means, so this is linker-safe.")]
+#endif
 		bool DynamicConformsToProtocol (NativeHandle protocol)
 		{
 #if NET
+			// Note that this method does not work with NativeAOT, so throw an exception in that case.
 			if (Runtime.IsNativeAOT)
 				throw Runtime.CreateNativeAOTNotSupportedException ();
 #endif

tests/dotnet/UnitTests/TrimmerWarningsTest.cs

@@ -33,7 +33,6 @@ public void TrimmerWarningsDynamicRegistrar (ApplePlatform platform, string runt
 			case ApplePlatform.iOS:
 			case ApplePlatform.TVOS:
 				expectedWarnings = new ExpectedBuildMessage [] {
-					new ExpectedBuildMessage ("src/Foundation/NSObject2.cs" /* line 554 */, "Foundation.NSObject.DynamicConformsToProtocol(NativeHandle): 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.Interfaces' in call to 'System.Type.GetInterfaces()'. The return value of method 'System.Object.GetType()' 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."),
 					new ExpectedBuildMessage ("src/ObjCRuntime/Blocks.cs" /* line 313 */, "ObjCRuntime.BlockLiteral.SetupBlock(Delegate, Delegate): 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.PublicMethods' in call to 'System.Type.GetMethod(String)'. The return value of method 'ObjCRuntime.MonoPInvokeCallbackAttribute.DelegateType.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."),
 					new ExpectedBuildMessage ("src/ObjCRuntime/DynamicRegistrar.cs" /* line 542 */, "Registrar.DynamicRegistrar.HasThisAttributeImpl(MethodBase): Attribute 'System.Runtime.CompilerServices.ExtensionAttribute' is being referenced in code but the trimmer was instructed to remove all instances of this attribute. If the attribute instances are necessary make sure to either remove the trimmer attribute XML portion which removes the attribute instances, or override the removal by using the trimmer XML descriptor to keep the attribute type (which in turn keeps all of its instances)."),
 					new ExpectedBuildMessage ("src/ObjCRuntime/Runtime.cs" /* line 714 */, "ObjCRuntime.Runtime.CollectReferencedAssemblies(List<Assembly>, Assembly): Using member 'System.Reflection.Assembly.GetReferencedAssemblies()' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. Assembly references might be removed."),
@@ -47,7 +46,6 @@ public void TrimmerWarningsDynamicRegistrar (ApplePlatform platform, string runt
 				break;
 			case ApplePlatform.MacOSX:
 				expectedWarnings = new ExpectedBuildMessage [] {
-					new ExpectedBuildMessage ("src/Foundation/NSObject2.cs" /* line 554 */, "Foundation.NSObject.DynamicConformsToProtocol(NativeHandle): 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.Interfaces' in call to 'System.Type.GetInterfaces()'. The return value of method 'System.Object.GetType()' 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."),
 					new ExpectedBuildMessage ("src/ObjCRuntime/DynamicRegistrar.cs" /* line 542 */, "Registrar.DynamicRegistrar.HasThisAttributeImpl(MethodBase): Attribute 'System.Runtime.CompilerServices.ExtensionAttribute' is being referenced in code but the trimmer was instructed to remove all instances of this attribute. If the attribute instances are necessary make sure to either remove the trimmer attribute XML portion which removes the attribute instances, or override the removal by using the trimmer XML descriptor to keep the attribute type (which in turn keeps all of its instances)."),
 					new ExpectedBuildMessage ("src/ObjCRuntime/Runtime.CoreCLR.cs" /* line 177 */, "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."),
 					new ExpectedBuildMessage ("src/ObjCRuntime/Runtime.cs" /* line 714 */, "ObjCRuntime.Runtime.CollectReferencedAssemblies(List<Assembly>, Assembly): Using member 'System.Reflection.Assembly.GetReferencedAssemblies()' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. Assembly references might be removed."),
@@ -62,7 +60,6 @@ public void TrimmerWarningsDynamicRegistrar (ApplePlatform platform, string runt
 				break;
 			case ApplePlatform.MacCatalyst:
 				expectedWarnings = new ExpectedBuildMessage [] {
-					new ExpectedBuildMessage ("src/Foundation/NSObject2.cs" /* line 554 */, "Foundation.NSObject.DynamicConformsToProtocol(NativeHandle): 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.Interfaces' in call to 'System.Type.GetInterfaces()'. The return value of method 'System.Object.GetType()' 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."),
 					new ExpectedBuildMessage ("src/ObjCRuntime/DynamicRegistrar.cs" /* line 542 */, "Registrar.DynamicRegistrar.HasThisAttributeImpl(MethodBase): Attribute 'System.Runtime.CompilerServices.ExtensionAttribute' is being referenced in code but the trimmer was instructed to remove all instances of this attribute. If the attribute instances are necessary make sure to either remove the trimmer attribute XML portion which removes the attribute instances, or override the removal by using the trimmer XML descriptor to keep the attribute type (which in turn keeps all of its instances)."),
 					new ExpectedBuildMessage ("src/ObjCRuntime/Runtime.cs" /* line 714 */, "ObjCRuntime.Runtime.CollectReferencedAssemblies(List<Assembly>, Assembly): Using member 'System.Reflection.Assembly.GetReferencedAssemblies()' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. Assembly references might be removed."),
 					new ExpectedBuildMessage ("src/ObjCRuntime/Runtime.cs" /* line 983 */, "ObjCRuntime.Runtime.GetBlockProxyAttributeMethod(MethodInfo, Int32): 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.PublicMethods' in call to 'System.Type.GetMethod(String)'. The return value of method 'ObjCRuntime.BlockProxyAttribute.Type.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."),