Xamarin.Android.PCLSupport.targets

<?xml version="1.0" encoding="UTF-8" ?>
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
	<!-- PCL Support -->
	<PropertyGroup>
		<_IsXBuild Condition="'$(MSBuildRuntimeVersion)' == ''">true</_IsXBuild>
		<CheckForSystemRuntimeDependency>true</CheckForSystemRuntimeDependency>
		<ImplicitlyExpandDesignTimeFacades>true</ImplicitlyExpandDesignTimeFacades>
		<ResolveReferencesDependsOn>
			$(ResolveReferencesDependsOn);
			ImplicitlyExpandDesignTimeFacades
		</ResolveReferencesDependsOn>

		<ImplicitlyExpandDesignTimeFacadesDependsOn>
			$(ImplicitlyExpandDesignTimeFacadesDependsOn);
			GetReferenceAssemblyPaths
		</ImplicitlyExpandDesignTimeFacadesDependsOn>
	</PropertyGroup>

	<Import Project="$(MSBuildThisFileDirectory)$(MSBuildThisFileName).props" 
		Condition="Exists('$(MSBuildThisFileDirectory)$(MSBuildThisFileName).props') And ('$(_IsXBuild)' != 'true' And Exists ('$(MSBuildExtensionsPath)\Microsoft\Microsoft.NET.Build.Extensions\tools\net46\Microsoft.NET.Build.Extensions.Tasks.dll'))" />
	
	<Target Name="ImplicitlyExpandDesignTimeFacades" Condition="'$(ImplicitlyExpandDesignTimeFacades)' == 'true'" DependsOnTargets="$(ImplicitlyExpandDesignTimeFacadesDependsOn)">

		<ItemGroup>
			<_XACandidateNETStandardReferences Include="@(Reference);@(_ResolvedProjectReferencePaths)" />
		</ItemGroup>
		
		<PropertyGroup>
			<_HasReferenceToSystemRuntime Condition="'$(DependsOnSystemRuntime)' == 'true' or '%(_ResolvedProjectReferencePaths.TargetPlatformIdentifier)' == 'Portable' 
								or '%(ReferenceDependencyPaths.Filename)' == 'System.Runtime'">true</_HasReferenceToSystemRuntime>
			<_XANETStandardInbox Condition="'$(XI_NETStandardInbox)' == '' and Exists('%(XI_InboxNETStandardFolders.Identity)\netstandard.dll')">true</_XANETStandardInbox>
		</PropertyGroup>

		<!--
			Facades are expanded if we have a reference that depends on System.Runtime .
			XI projects have `$(TargetFrameworkIdentifier) != .NETFramework`, so Microsoft.NET.Build.Extensions (which provides support for ns 2.0 projects) doesn't get
			imported. And netstandard.dll reference, even if required, doesn't get added.
			So, we need to check if any references depend on `netstandard`. And if so, expand the facades, which include netstandard.dll .
			If $(_HasReferenceToSystemRuntime) is true, then the facades are going to be expanded anyway, so don't run this.
		-->
		<GetDependsOnNETStandard
				Condition="'$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences->Count())' != '0'"
				References="@(_XACandidateNETStandardReferences)">
			<Output TaskParameter="DependsOnNETStandard" PropertyName="_XADependsOnNETStandard" />
		</GetDependsOnNETStandard>

		<ItemGroup Condition="'$(_HasReferenceToSystemRuntime)' == 'true' or ('$(_XANETStandardInbox)' == 'true' and '$(_XADependsOnNETStandard)' == 'true')">
			<_DesignTimeFacadeAssemblies Include="%(DesignTimeFacadeDirectories.Identity)*.dll"/>
			<ReferencePath Remove="@(_DesignTimeFacadeAssemblies)"/>
			<ReferencePath Include="%(_DesignTimeFacadeAssemblies.Identity)">
				<WinMDFile>false</WinMDFile>
				<CopyLocal>false</CopyLocal>
				<ResolvedFrom>ImplicitlyExpandDesignTimeFacades</ResolvedFrom>
			</ReferencePath>
			<ReferenceDependencyPath Include="@(ReferencePath)" Condition="'%(ReferencePath.ResolvedFrom)' == 'ImplicitlyExpandDesignTimeFacades'" />
		</ItemGroup>
		
		<Message Importance="Low" Text="Including @(ReferencePath)" Condition="'%(ReferencePath.ResolvedFrom)' == 'ImplicitlyExpandDesignTimeFacades'" />
	</Target>
</Project>