[Xamarin.Android.Build.Tasks] Emit warnings if using deprecated bindings fallback flags.

Author: jpobst

src/Xamarin.Android.Build.Tasks/MSBuild/Xamarin/Android/Xamarin.Android.Bindings.Core.targets

@@ -33,6 +33,19 @@ It is shared between "legacy" binding projects and .NET 5 projects.
     <NoWarn Condition=" '$(DocumentationFile)' != '' ">$(NoWarn);CS1573;CS1591</NoWarn>
   </PropertyGroup>
 
+  <Target Name="_CheckNonIdealBindingConfigurations">
+    <AndroidWarning Code="XA1037"
+        ResourceName="XA1037"
+        FormatArguments="_AndroidUseJavaLegacyResolver;10"
+        Condition=" '$(_AndroidUseJavaLegacyResolver)' == 'true' "
+    />
+    <AndroidWarning Code="XA1037"
+        ResourceName="XA1037"
+        FormatArguments="_AndroidEmitLegacyInterfaceInvokers;10"
+        Condition=" '$(_AndroidEmitLegacyInterfaceInvokers)' == 'true' "
+    />
+  </Target>
+
   <Target Name="_SetAndroidGenerateManagedBindings"
       Condition=" '@(InputJar->Count())' != '0' Or '@(EmbeddedJar->Count())' != '0' Or '@(LibraryProjectZip->Count())' != '0' Or '@(_JavaBindingSource->Count())' != '0' ">
     <PropertyGroup>

src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.BuildOrder.targets

@@ -82,6 +82,7 @@ properties that determine build ordering.
   <PropertyGroup Condition=" '$(AndroidApplication)' != 'True' ">
     <BuildDependsOn>
       _ValidateLinkMode;
+      _CheckNonIdealBindingConfigurations;
       _SetupMSBuildAllProjects;
       _SetupDesignTimeBuildForBuild;
       _CategorizeAndroidLibraries;

src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.DefaultProperties.targets

@@ -39,7 +39,7 @@
     <AndroidBoundInterfacesContainStaticAndDefaultInterfaceMethods Condition=" '$(AndroidBoundInterfacesContainStaticAndDefaultInterfaceMethods)' == '' ">true</AndroidBoundInterfacesContainStaticAndDefaultInterfaceMethods>
     <AndroidBoundInterfacesContainTypes Condition=" '$(AndroidBoundInterfacesContainTypes)' == '' ">true</AndroidBoundInterfacesContainTypes>
     <AndroidBoundInterfacesContainConstants Condition=" '$(AndroidBoundInterfacesContainConstants)' == '' ">true</AndroidBoundInterfacesContainConstants>
-    <_AndroidEmitLegacyInterfaceInvokers Condition=" '$(AndroidEmitLegacyInterfaceInvokers)' == '' ">false</_AndroidEmitLegacyInterfaceInvokers>
+    <_AndroidEmitLegacyInterfaceInvokers Condition=" '$(_AndroidEmitLegacyInterfaceInvokers)' == '' ">false</_AndroidEmitLegacyInterfaceInvokers>
     <AndroidEnableObsoleteOverrideInheritance Condition=" '$(AndroidEnableObsoleteOverrideInheritance)' == '' ">true</AndroidEnableObsoleteOverrideInheritance>
     <AndroidEnableRestrictToAttributes Condition=" '$(AndroidEnableRestrictToAttributes)' == '' ">obsolete</AndroidEnableRestrictToAttributes>
 

src/Xamarin.Android.Build.Tasks/Properties/Resources.Designer.cs

@@ -996,4 +996,10 @@ To use a custom JDK path for a command line build, set the 'JavaSdkDirectory' MS
     <comment>The following are literal names and should not be translated: Maven
 {0} - User supplied Maven repository type</comment>
   </data>
+  <data name="XA1037" xml:space="preserve">
+    <value>The '{0}' MSBuild property is deprecated and will be removed in .NET {1}. See https://aka.ms/net-android-deprecations for more details.</value>
+    <comment>The following are literal names and should not be translated: MSBuild, .NET.
+{0} - The deprecated MSBuild property name
+{1} - The numeric version of .NET</comment>
+  </data>
 </root>