[msbuild] Unify the DetectSdkLocations task logic between iOS and Mac. (

xamarin#15256)

This was mostly a clean merge, with a few minor differences:

* We no longer compute whether we're running in the simulator or not when building for Mac Catalyst.
* The task now supports building remotely for macOS (due to code sharing).
  Will be useful if we ever support building macOS apps remotely.
* We now call AppleSdkSettings.Init () on macOS. No idea why we weren't
  before, but it seems logical for macOS to behave like our other platforms.

There shouldn't be any other functional differences.

msbuild/Xamarin.MacDev.Tasks.Core/Tasks/DetectSdkLocationCoreTaskBase.cs

@@ -73,8 +73,36 @@ protected IAppleSdk CurrentSdk {
 			}
 		}
 
-		protected abstract string GetDefaultXamarinSdkRoot ();
-		protected abstract IAppleSdkVersion GetDefaultSdkVersion ();
+		string GetDefaultXamarinSdkRoot ()
+		{
+			switch (Platform) {
+			case ApplePlatform.iOS:
+			case ApplePlatform.TVOS:
+			case ApplePlatform.WatchOS:
+			case ApplePlatform.MacCatalyst:
+				return Sdks.XamIOS.SdkDir;
+			case ApplePlatform.MacOSX:
+				return Sdks.XamMac.FrameworkDirectory;
+			default:
+				throw new InvalidOperationException (string.Format (MSBStrings.InvalidPlatform, Platform));
+			}
+		}
+
+		IAppleSdkVersion GetDefaultSdkVersion ()
+		{
+			switch (Platform) {
+			case ApplePlatform.iOS:
+			case ApplePlatform.TVOS:
+			case ApplePlatform.WatchOS:
+			case ApplePlatform.MacCatalyst:
+				return AppleSdkVersion.UseDefault;
+			case ApplePlatform.MacOSX:
+				var v = CurrentSdk.GetInstalledSdkVersions (false);
+				return v.Count > 0 ? v [v.Count - 1] : AppleSdkVersion.UseDefault;
+			default:
+				throw new InvalidOperationException (string.Format (MSBStrings.InvalidPlatform, Platform));
+			}
+		}
 
 		protected string GetEnvironmentVariableOverride ()
 		{
@@ -147,6 +175,10 @@ void EnsureXamarinSdkRoot ()
 
 		public override bool Execute ()
 		{
+			AppleSdkSettings.Init ();
+
+			SetIsSimulator ();
+
 			// If XamarinSdkRoot is set, then make that override any other value, and in order to do so,
 			// set the corresponding environment variable accordingly.
 			if (!string.IsNullOrEmpty (XamarinSdkRoot))
@@ -159,6 +191,25 @@ public override bool Execute ()
 			return !Log.HasLoggedErrors;
 		}
 
+		void SetIsSimulator ()
+		{
+			switch (Platform) {
+			case ApplePlatform.MacCatalyst:
+			case ApplePlatform.MacOSX:
+				return;
+			}
+
+			TargetArchitecture architectures;
+			if (string.IsNullOrEmpty (TargetArchitectures) || !Enum.TryParse (TargetArchitectures, out architectures))
+				architectures = TargetArchitecture.Default;
+
+			if (!string.IsNullOrEmpty (IsDotNetSimulatorBuild)) {
+				SdkIsSimulator = string.Equals (IsDotNetSimulatorBuild, "true", StringComparison.OrdinalIgnoreCase);
+			} else {
+				SdkIsSimulator = (architectures & (TargetArchitecture.i386 | TargetArchitecture.x86_64)) != 0;
+			}
+		}
+
 		protected bool EnsureAppleSdkRoot ()
 		{
 			var currentSdk = CurrentSdk;

msbuild/Xamarin.iOS.Tasks/Tasks/DetectSdkLocations.cs → msbuild/Xamarin.MacDev.Tasks/Tasks/DetectSdkLocations.cs

@@ -1,16 +1,16 @@
 using System;
+
 using Microsoft.Build.Framework;
+
 using Xamarin.Messaging.Build.Client;
 
-namespace Xamarin.iOS.Tasks
-{
-	public class DetectSdkLocations : DetectSdkLocationsTaskBase, ICancelableTask
-	{
+namespace Xamarin.MacDev.Tasks {
+	public class DetectSdkLocations : DetectSdkLocationsCoreTaskBase, ICancelableTask {
 		const string SdkVersionDefaultValue = "default";
 
 		public override bool Execute ()
 		{
-			if (!ShouldExecuteRemotely())
+			if (!ShouldExecuteRemotely ())
 				return base.Execute ();
 
 			// The new targets do not support the "default" value for the MtouchSdkVersion

msbuild/Xamarin.Shared/Xamarin.Shared.targets

@@ -41,7 +41,6 @@ Copyright (C) 2018 Microsoft. All rights reserved.
 	<UsingTask Condition="'$(_PlatformName)' != 'macOS'" TaskName="Xamarin.iOS.Tasks.CompileITunesMetadata" AssemblyFile="$(_TaskAssemblyName)" />
 	<UsingTask Condition="'$(_PlatformName)' != 'macOS'" TaskName="Xamarin.iOS.Tasks.CreateAssetPack" AssemblyFile="$(_TaskAssemblyName)" />
 	<UsingTask Condition="'$(_PlatformName)' != 'macOS'" TaskName="Xamarin.iOS.Tasks.CreateEmbeddedResources" AssemblyFile="$(_TaskAssemblyName)" />
-	<UsingTask Condition="'$(_PlatformName)' != 'macOS'" TaskName="Xamarin.iOS.Tasks.DetectSdkLocations" AssemblyFile="$(_TaskAssemblyName)" />
 	<UsingTask Condition="'$(_PlatformName)' != 'macOS'" TaskName="Xamarin.iOS.Tasks.DetectSigningIdentity" AssemblyFile="$(_TaskAssemblyName)" />
 	<UsingTask Condition="'$(_PlatformName)' != 'macOS'" TaskName="Xamarin.iOS.Tasks.FindWatchOS2AppBundle" AssemblyFile="$(_TaskAssemblyName)" />
 	<UsingTask Condition="'$(_PlatformName)' != 'macOS'" TaskName="Xamarin.iOS.Tasks.GetMlaunchArguments" AssemblyFile="$(_TaskAssemblyName)" />
@@ -57,7 +56,6 @@ Copyright (C) 2018 Microsoft. All rights reserved.
 	<!-- Xamarin.Mac-specific tasks. Some of these are duplicated with the Xamarin.iOS ones above, and should eventually be re-namespaced to be in Xamarin.MacDev -->
 	<UsingTask Condition="'$(_PlatformName)' == 'macOS'" TaskName="Xamarin.Mac.Tasks.CompileAppManifest" AssemblyFile="$(_TaskAssemblyName)" />
 	<UsingTask Condition="'$(_PlatformName)' == 'macOS'" TaskName="Xamarin.Mac.Tasks.CreateEmbeddedResources" AssemblyFile="$(_TaskAssemblyName)" />
-	<UsingTask Condition="'$(_PlatformName)' == 'macOS'" TaskName="Xamarin.Mac.Tasks.DetectSdkLocations" AssemblyFile="$(_TaskAssemblyName)" />
 	<UsingTask Condition="'$(_PlatformName)' == 'macOS'" TaskName="Xamarin.Mac.Tasks.DetectSigningIdentity" AssemblyFile="$(_TaskAssemblyName)" />
 	<UsingTask Condition="'$(_PlatformName)' == 'macOS'" TaskName="Xamarin.Mac.Tasks.Mmp" AssemblyFile="$(_TaskAssemblyName)" />
 	<UsingTask Condition="'$(_PlatformName)' == 'macOS'" TaskName="Xamarin.Mac.Tasks.PrepareNativeReferences" AssemblyFile="$(_TaskAssemblyName)" />
@@ -88,6 +86,7 @@ Copyright (C) 2018 Microsoft. All rights reserved.
 	<UsingTask TaskName="Xamarin.MacDev.Tasks.CompileProductDefinition" AssemblyFile="$(_TaskAssemblyName)" />
 	<UsingTask TaskName="Xamarin.MacDev.Tasks.ComputeCodesignItems" AssemblyFile="$(_TaskAssemblyName)" />
 	<UsingTask TaskName="Xamarin.MacDev.Tasks.DetectDebugNetworkConfiguration" AssemblyFile="$(_TaskAssemblyName)" />
+	<UsingTask TaskName="Xamarin.MacDev.Tasks.DetectSdkLocations" AssemblyFile="$(_TaskAssemblyName)" />
 	<UsingTask TaskName="Xamarin.MacDev.Tasks.Ditto" AssemblyFile="$(_TaskAssemblyName)" />
 	<UsingTask TaskName="Xamarin.MacDev.Tasks.DSymUtil" AssemblyFile="$(_TaskAssemblyName)" />
 	<UsingTask TaskName="Xamarin.MacDev.Tasks.EmbedProvisionProfile" AssemblyFile="$(_TaskAssemblyName)" />

tests/msbuild/Xamarin.MacDev.Tasks.Tests/TaskTests/DetectSdkLocationsTaskTests.cs

@@ -3,7 +3,9 @@
 
 using NUnit.Framework;
 
-namespace Xamarin.iOS.Tasks
+using Xamarin.iOS.Tasks;
+
+namespace Xamarin.MacDev.Tasks
 {
 	[TestFixture]
 	public class DetectSdkLocationsTaskTests : TestBase