Xamarin iOS - Hosted MacOS Agent fails to build

Troubleshooting

Checkout how to troubleshoot failures and collect debug logs: https://docs.microsoft.com/en-us/vsts/build-release/actions/troubleshooting

Environment

• Server - VSTS or TFS on-premises?

  • If using TFS on-premises, provide the version: VSTS

  • If using VSTS, provide the account name, team project name, build definition name/build number: Account Name: deventerprise Team Project Name: FoundIt Build Definition Name: Production > iOS (ID: 14) Build number: 20171117.5 (ID: 533)

• Agent - Hosted or Private: Hosted

  • If using Hosted agent, provide agent queue name: Hosted macOS Preview

  • If using private agent, provide the OS of the machine running the agent and the agent version: -

Issue Description

iOS builds do not seem to work using the Hosted macOS Preview queue compared to using a private host such as MacinCloud. Trying to move my builds to use Hosted macOS Preview and simply cannot get them to build successfully.

The build breaks when running the Xamarin.iOS build task.

Using a separate NuGet restore task without enabling the “Run NuGet Restore” under Advanced results in packages not being restored correctly: error CS0246: The type or namespace name 'Humanizer' could not be found (are you missing a using directive or an assembly reference?) [/Users/vsts/agent/2.124.0/work/1/s/src/Core/XYZ.csproj]

Using the double restore (separate task as well as option to restore in the Xamarin.iOS task) results in a different error: MTOUCH : error MT4109: Failed to compile the generated registrar code. Please file a bug report at http://bugzilla.xamarin.com [/Users/vsts/agent/2.124.0/work/1/s/src/Mobile/XYZ.csproj]

The actual build error is being caused by this:

2017-11-17T07:13:44.5316500Z   /Users/vsts/agent/2.124.0/work/1/s/src/Mobile/XYZ/obj/iPhone/Release/mtouch-cache/registrar.h:13:9: fatal error: 'QuartzCore/CAEmitterBehavior.h' file not found
2017-11-17T07:13:44.5414550Z   #import <QuartzCore/CAEmitterBehavior.h>
2017-11-17T07:13:44.5516440Z           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The following items have been reported to Xamarin, appears to be a version mismatch with XCode and Xamarin or the use of beta versions of XCode. https://bugzilla.xamarin.com/show_bug.cgi?id=57900 https://bugzilla.xamarin.com/show_bug.cgi?id=59322 https://bugzilla.xamarin.com/show_bug.cgi?id=59523

Added snippet of the error log below.

Error logs

[Insert error from the logs here]

2017-11-17T07:12:03.1204800Z     SdkIsSimulator: False
2017-11-17T07:12:03.1221510Z     SdkRoot: /Applications/Xcode.app/Contents/Developer
2017-11-17T07:12:03.1265940Z     SdkVersion: 11.1
2017-11-17T07:12:03.1284370Z     SymbolsList: obj/iPhone/Release/mtouch-symbols.list
2017-11-17T07:12:03.1303050Z     TargetFrameworkIdentifier: Xamarin.iOS
2017-11-17T07:12:03.1320100Z     UseFloat32: False
2017-11-17T07:12:03.1336390Z     UseLlvm: True
2017-11-17T07:12:03.1352590Z     UseThumb: False
2017-11-17T07:12:03.1368960Z     Verbosity: 0
2017-11-17T07:12:03.1720900Z   /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/bin/mtouch --cache /Users/vsts/agent/2.124.0/work/1/s/src/Mobile/XYZ/obj/iPhone/Release/mtouch-cache --dev /Users/vsts/agent/2.124.0/work/1/s/src/Mobile/XYZ/bin/iPhone/Release/FoundItAppPortableiOS.app --executable FoundItAppPortableiOS --linksdkonly --sdkroot /Applications/Xcode.app/Contents/Developer --sdk 11.1 --targetver 8.1 --aot-options=-O=-float32 --http-message-handler=NSUrlSessionHandler --abi=arm64+llvm --symbollist /Users/vsts/agent/2.124.0/work/1/s/src/Mobile/XYZ/obj/iPhone/Release/mtouch-symbols.list --dsym=no -r /Users/vsts/agent/2.124.0/work/1/s/packages/Autofac.4.6.2/lib/netstandard1.1/Autofac.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Autofac.Extras.MvvmCross.4.0.2/lib/portable45-net45+win8+wpa81/Autofac.Extras.MvvmCross.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/AutofacSerilogIntegration.2.0.0/lib/netstandard1.1/AutofacSerilogIntegration.dll -r /Users/vsts/agent/2.124.0/work/1/s/src/Core/XYZ.Model/bin/Release/XYZ.Model.dll -r /Users/vsts/agent/2.124.0/work/1/s/src/Mobile/XYZ.Shared/bin/Release/XYZ.Shared.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Xamarin.FFImageLoading.2.2.20/lib/Xamarin.iOS10/FFImageLoading.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Xamarin.FFImageLoading.2.2.20/lib/Xamarin.iOS10/FFImageLoading.Platform.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/mbprogresshud.0.9.2.0/lib/Xamarin.iOS/MBProgressHUD.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.ApplicationInsights.DependencyCollector.2.4.1/lib/netstandard1.6/Microsoft.AI.DependencyCollector.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.ApplicationInsights.AspNetCore.2.1.1/lib/netstandard1.6/Microsoft.ApplicationInsights.AspNetCore.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.ApplicationInsights.2.4.0/lib/netstandard1.3/Microsoft.ApplicationInsights.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.AspNetCore.Hosting.Abstractions.1.0.0/lib/netstandard1.3/Microsoft.AspNetCore.Hosting.Abstractions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.AspNetCore.Hosting.1.0.0/lib/netstandard1.3/Microsoft.AspNetCore.Hosting.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.AspNetCore.Hosting.Server.Abstractions.1.0.0/lib/netstandard1.3/Microsoft.AspNetCore.Hosting.Server.Abstractions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.AspNetCore.Http.Abstractions.1.0.0/lib/netstandard1.3/Microsoft.AspNetCore.Http.Abstractions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.AspNetCore.Http.1.0.0/lib/netstandard1.3/Microsoft.AspNetCore.Http.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.AspNetCore.Http.Extensions.1.0.0/lib/netstandard1.3/Microsoft.AspNetCore.Http.Extensions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.AspNetCore.Http.Features.1.0.0/lib/netstandard1.3/Microsoft.AspNetCore.Http.Features.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.AspNetCore.WebUtilities.1.0.0/lib/netstandard1.3/Microsoft.AspNetCore.WebUtilities.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Azure.Mobile.Analytics.0.16.0/lib/Xamarin.iOS10/Microsoft.Azure.Mobile.Analytics.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Azure.Mobile.Analytics.0.16.0/lib/Xamarin.iOS10/Microsoft.Azure.Mobile.Analytics.iOS.Bindings.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Azure.Mobile.Crashes.0.16.0/lib/Xamarin.iOS10/Microsoft.Azure.Mobile.Crashes.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Azure.Mobile.Crashes.0.16.0/lib/Xamarin.iOS10/Microsoft.Azure.Mobile.Crashes.iOS.Bindings.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Azure.Mobile.0.16.0/lib/Xamarin.iOS10/Microsoft.Azure.Mobile.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Azure.Mobile.0.16.0/lib/Xamarin.iOS10/Microsoft.Azure.Mobile.iOS.Bindings.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Microsoft.CSharp.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.Configuration.Abstractions.1.0.0/lib/netstandard1.0/Microsoft.Extensions.Configuration.Abstractions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.Configuration.1.0.0/lib/netstandard1.1/Microsoft.Extensions.Configuration.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.Configuration.EnvironmentVariables.1.0.0/lib/netstandard1.3/Microsoft.Extensions.Configuration.EnvironmentVariables.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.Configuration.FileExtensions.1.0.0/lib/netstandard1.3/Microsoft.Extensions.Configuration.FileExtensions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.Configuration.Json.1.0.0/lib/netstandard1.3/Microsoft.Extensions.Configuration.Json.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.DependencyInjection.Abstractions.1.0.0/lib/netstandard1.0/Microsoft.Extensions.DependencyInjection.Abstractions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.DependencyInjection.1.0.0/lib/netstandard1.1/Microsoft.Extensions.DependencyInjection.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.DiagnosticAdapter.1.0.0/lib/netstandard1.1/Microsoft.Extensions.DiagnosticAdapter.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.FileProviders.Abstractions.1.0.0/lib/netstandard1.0/Microsoft.Extensions.FileProviders.Abstractions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.FileProviders.Physical.1.0.0/lib/netstandard1.3/Microsoft.Extensions.FileProviders.Physical.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.FileSystemGlobbing.1.0.0/lib/netstandard1.3/Microsoft.Extensions.FileSystemGlobbing.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.Logging.Abstractions.1.0.0/lib/netstandard1.1/Microsoft.Extensions.Logging.Abstractions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.Logging.1.0.0/lib/netstandard1.1/Microsoft.Extensions.Logging.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.ObjectPool.1.0.0/lib/netstandard1.3/Microsoft.Extensions.ObjectPool.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.Options.1.0.0/lib/netstandard1.0/Microsoft.Extensions.Options.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.PlatformAbstractions.1.1.0/lib/netstandard1.3/Microsoft.Extensions.PlatformAbstractions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.Primitives.1.0.0/lib/netstandard1.0/Microsoft.Extensions.Primitives.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Net.Http.Headers.1.0.0/lib/netstandard1.1/Microsoft.Net.Http.Headers.dll -r /Users/vsts/agent/2.124.0/work/1/s/components/azure-messaging-1.1.5.6/lib/ios-unified/Microsoft.WindowsAzure.Messaging.iOS.dll -r /Users/vsts/agent/2.124.0/work/1/s/components/modernhttpclient-2.4.2/lib/ios-unified/ModernHttpClient.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/mscorlib.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Binding.5.1.0/lib/Xamarin.iOS10/MvvmCross.Binding.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Binding.5.1.0/lib/Xamarin.iOS10/MvvmCross.Binding.iOS.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Core.5.1.0/lib/Xamarin.iOS10/MvvmCross.Core.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Core.5.1.0/lib/Xamarin.iOS10/MvvmCross.iOS.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Binding.5.1.0/lib/Xamarin.iOS10/MvvmCross.Localization.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Platform.5.1.0/lib/Xamarin.iOS10/MvvmCross.Platform.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Platform.5.1.0/lib/Xamarin.iOS10/MvvmCross.Platform.iOS.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Plugin.DownloadCache.5.1.0/lib/Xamarin.iOS10/MvvmCross.Plugins.DownloadCache.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Plugin.DownloadCache.5.1.0/lib/Xamarin.iOS10/MvvmCross.Plugins.DownloadCache.iOS.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Plugin.File.5.1.0/lib/Xamarin.iOS10/MvvmCross.Plugins.File.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Plugin.File.5.1.0/lib/Xamarin.iOS10/MvvmCross.Plugins.File.iOS.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Newtonsoft.Json.9.0.1/lib/portable-net45+wp80+win8+wpa81/Newtonsoft.Json.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Xam.Plugin.Connectivity.3.0.3/lib/Xamarin.iOS10/Plugin.Connectivity.Abstractions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Xam.Plugin.Connectivity.3.0.3/lib/Xamarin.iOS10/Plugin.Connectivity.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Xam.Plugin.DeviceInfo.2.1.2/lib/Xamarin.iOS10/Plugin.DeviceInfo.Abstractions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Xam.Plugin.DeviceInfo.2.1.2/lib/Xamarin.iOS10/Plugin.DeviceInfo.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Xam.Plugin.Geolocator.3.0.4/lib/Xamarin.iOS10/Plugin.Geolocator.Abstractions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Xam.Plugin.Geolocator.3.0.4/lib/Xamarin.iOS10/Plugin.Geolocator.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Xam.Plugins.Settings.2.5.8/lib/Xamarin.iOS10/Plugin.Settings.Abstractions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Xam.Plugins.Settings.2.5.8/lib/Xamarin.iOS10/Plugin.Settings.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Serilog.2.5.0/lib/netstandard1.3/Serilog.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Serilog.Sinks.ApplicationInsights.2.2.1/lib/netstandard1.6/Serilog.Sinks.ApplicationInsights.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Serilog.Sinks.Logentries.3.0.26/lib/netstandard1.3/Serilog.Sinks.Logentries.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Serilog.Sinks.PeriodicBatching.2.1.1/lib/netstandard1.2/Serilog.Sinks.PeriodicBatching.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Serilog.Sinks.Xamarin.0.1.29/lib/Xamarin.iOS10/Serilog.Sinks.Xamarin.iOS.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/System.Buffers.4.0.0/lib/netstandard1.1/System.Buffers.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/System.Collections.Immutable.1.3.1/lib/portable-net45+win8+wp8+wpa81/System.Collections.Immutable.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/System.Core.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/System.Diagnostics.DiagnosticSource.4.4.0/lib/netstandard1.3/System.Diagnostics.DiagnosticSource.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/System.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/System.IO.Compression.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/System.Net.Http.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/System.Reflection.Emit.4.0.1/lib/netstandard1.3/System.Reflection.Emit.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/System.Reflection.Emit.ILGeneration.4.0.1/lib/netstandard1.3/System.Reflection.Emit.ILGeneration.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/System.Reflection.Emit.Lightweight.4.0.1/lib/netstandard1.3/System.Reflection.Emit.Lightweight.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/System.Reflection.Metadata.1.3.0/lib/portable-net45+win8/System.Reflection.Metadata.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/System.Text.Encodings.Web.4.3.1/lib/netstandard1.0/System.Text.Encodings.Web.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/System.Xml.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/WebP.Touch.1.0.4/lib/Xamarin.iOS10/WebP.Touch.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Xamarin.iOS.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/Microsoft.Win32.Primitives.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/Microsoft.Win32.Registry.AccessControl.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/Microsoft.Win32.Registry.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/netstandard.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.AppContext.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Collections.Concurrent.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Collections.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Collections.NonGeneric.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Collections.Specialized.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.ComponentModel.Annotations.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.ComponentModel.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.ComponentModel.EventBasedAsync.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.ComponentModel.Primitives.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.ComponentModel.TypeConverter.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Console.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Data.Common.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Data.SqlClient.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Diagnostics.Contracts.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Diagnostics.Debug.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Diagnostics.FileVersionInfo.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Diagnostics.Process.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Diagnostics.StackTrace.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Diagnostics.TextWriterTraceListener.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Diagnostics.Tools.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Diagnostics.TraceEvent.dll -r /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Diagnostics.TraceSource.dll -r 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/Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.Logging.Abstractions.1.0.0/lib/netstandard1.1/Microsoft.Extensions.Logging.Abstractions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.Logging.1.0.0/lib/netstandard1.1/Microsoft.Extensions.Logging.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.ObjectPool.1.0.0/lib/netstandard1.3/Microsoft.Extensions.ObjectPool.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.Options.1.0.0/lib/netstandard1.0/Microsoft.Extensions.Options.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.PlatformAbstractions.1.1.0/lib/netstandard1.3/Microsoft.Extensions.PlatformAbstractions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Extensions.Primitives.1.0.0/lib/netstandard1.0/Microsoft.Extensions.Primitives.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Microsoft.Net.Http.Headers.1.0.0/lib/netstandard1.1/Microsoft.Net.Http.Headers.dll -r /Users/vsts/agent/2.124.0/work/1/s/components/azure-messaging-1.1.5.6/lib/ios-unified/Microsoft.WindowsAzure.Messaging.iOS.dll -r /Users/vsts/agent/2.124.0/work/1/s/components/modernhttpclient-2.4.2/lib/ios-unified/ModernHttpClient.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Binding.5.1.0/lib/Xamarin.iOS10/MvvmCross.Binding.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Binding.5.1.0/lib/Xamarin.iOS10/MvvmCross.Binding.iOS.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Core.5.1.0/lib/Xamarin.iOS10/MvvmCross.Core.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Core.5.1.0/lib/Xamarin.iOS10/MvvmCross.iOS.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Binding.5.1.0/lib/Xamarin.iOS10/MvvmCross.Localization.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Platform.5.1.0/lib/Xamarin.iOS10/MvvmCross.Platform.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Platform.5.1.0/lib/Xamarin.iOS10/MvvmCross.Platform.iOS.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Plugin.DownloadCache.5.1.0/lib/Xamarin.iOS10/MvvmCross.Plugins.DownloadCache.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Plugin.DownloadCache.5.1.0/lib/Xamarin.iOS10/MvvmCross.Plugins.DownloadCache.iOS.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Plugin.File.5.1.0/lib/Xamarin.iOS10/MvvmCross.Plugins.File.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/MvvmCross.Plugin.File.5.1.0/lib/Xamarin.iOS10/MvvmCross.Plugins.File.iOS.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Newtonsoft.Json.9.0.1/lib/portable-net45+wp80+win8+wpa81/Newtonsoft.Json.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Xam.Plugin.Connectivity.3.0.3/lib/Xamarin.iOS10/Plugin.Connectivity.Abstractions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Xam.Plugin.Connectivity.3.0.3/lib/Xamarin.iOS10/Plugin.Connectivity.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Xam.Plugin.DeviceInfo.2.1.2/lib/Xamarin.iOS10/Plugin.DeviceInfo.Abstractions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Xam.Plugin.DeviceInfo.2.1.2/lib/Xamarin.iOS10/Plugin.DeviceInfo.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Xam.Plugin.Geolocator.3.0.4/lib/Xamarin.iOS10/Plugin.Geolocator.Abstractions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Xam.Plugin.Geolocator.3.0.4/lib/Xamarin.iOS10/Plugin.Geolocator.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Xam.Plugins.Settings.2.5.8/lib/Xamarin.iOS10/Plugin.Settings.Abstractions.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Xam.Plugins.Settings.2.5.8/lib/Xamarin.iOS10/Plugin.Settings.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Serilog.2.5.0/lib/netstandard1.3/Serilog.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Serilog.Sinks.ApplicationInsights.2.2.1/lib/netstandard1.6/Serilog.Sinks.ApplicationInsights.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Serilog.Sinks.Logentries.3.0.26/lib/netstandard1.3/Serilog.Sinks.Logentries.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Serilog.Sinks.PeriodicBatching.2.1.1/lib/netstandard1.2/Serilog.Sinks.PeriodicBatching.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/Serilog.Sinks.Xamarin.0.1.29/lib/Xamarin.iOS10/Serilog.Sinks.Xamarin.iOS.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/System.Buffers.4.0.0/lib/netstandard1.1/System.Buffers.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/System.Collections.Immutable.1.3.1/lib/portable-net45+win8+wp8+wpa81/System.Collections.Immutable.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/System.Diagnostics.DiagnosticSource.4.4.0/lib/netstandard1.3/System.Diagnostics.DiagnosticSource.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/System.Reflection.Emit.4.0.1/lib/netstandard1.3/System.Reflection.Emit.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/System.Reflection.Emit.ILGeneration.4.0.1/lib/netstandard1.3/System.Reflection.Emit.ILGeneration.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/System.Reflection.Emit.Lightweight.4.0.1/lib/netstandard1.3/System.Reflection.Emit.Lightweight.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/System.Reflection.Metadata.1.3.0/lib/portable-net45+win8/System.Reflection.Metadata.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/System.Text.Encodings.Web.4.3.1/lib/netstandard1.0/System.Text.Encodings.Web.dll -r /Users/vsts/agent/2.124.0/work/1/s/packages/WebP.Touch.1.0.4/lib/Xamarin.iOS10/WebP.Touch.dll -r /Users/vsts/agent/2.124.0/work/1/s/src/Core/XYZ.Model/bin/Release/Humanizer.dll -r /Users/vsts/agent/2.124.0/work/1/s/src/Mobile/XYZ.Shared/bin/Release/MvvmCross.Plugins.Messenger.dll --target-framework Xamarin.iOS,v1.0 /Users/vsts/agent/2.124.0/work/1/s/src/Mobile/XYZ/bin/iPhone/Release/FoundItAppPortableiOS.exe -q 
2017-11-17T07:12:03.2087180Z /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.iOS.Common.targets(748,3): warning MSB6002: The command-line for the "MTouch" task is too long. Command-lines longer than 32000 characters are likely to fail. Try reducing the length of the command-line by breaking down the call to "MTouch" into multiple calls with fewer parameters per call. [/Users/vsts/agent/2.124.0/work/1/s/src/Mobile/XYZ/XYZ.csproj]
2017-11-17T07:12:03.2114470Z MTOUCH : warning MT0109: The assembly 'System.Reflection.Emit.dll' was loaded from a different path than the provided path (provided path: /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Reflection.Emit.dll, actual path: /Users/vsts/agent/2.124.0/work/1/s/packages/System.Reflection.Emit.4.0.1/lib/netstandard1.3/System.Reflection.Emit.dll). [/Users/vsts/agent/2.124.0/work/1/s/src/Mobile/XYZ/XYZ.csproj]
2017-11-17T07:12:03.2139750Z MTOUCH : warning MT0109: The assembly 'System.Reflection.Emit.ILGeneration.dll' was loaded from a different path than the provided path (provided path: /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Reflection.Emit.ILGeneration.dll, actual path: /Users/vsts/agent/2.124.0/work/1/s/packages/System.Reflection.Emit.ILGeneration.4.0.1/lib/netstandard1.3/System.Reflection.Emit.ILGeneration.dll). [/Users/vsts/agent/2.124.0/work/1/s/src/Mobile/XYZ/XYZ.csproj]
2017-11-17T07:12:03.2165630Z MTOUCH : warning MT0109: The assembly 'System.Reflection.Emit.Lightweight.dll' was loaded from a different path than the provided path (provided path: /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Facades/System.Reflection.Emit.Lightweight.dll, actual path: /Users/vsts/agent/2.124.0/work/1/s/packages/System.Reflection.Emit.Lightweight.4.0.1/lib/netstandard1.3/System.Reflection.Emit.Lightweight.dll). [/Users/vsts/agent/2.124.0/work/1/s/src/Mobile/XYZ/XYZ.csproj]
2017-11-17T07:13:44.5093110Z   Process exited with code 1, command:
2017-11-17T07:13:44.5118170Z   /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++  -Wno-receiver-forward-class -gdwarf-2 -I/Library/Frameworks/Xamarin.iOS.framework/Versions/10.12.3.3/SDKs/MonoTouch.iphoneos.sdk/usr/include -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS11.1.sdk -Qunused-arguments -miphoneos-version-min=8.1 -arch arm64 -c -o /Users/vsts/agent/2.124.0/work/1/s/src/Mobile/XYZ/obj/iPhone/Release/mtouch-cache/arm64/registrar.o -x objective-c++ /Users/vsts/agent/2.124.0/work/1/s/src/Mobile/XYZ/obj/iPhone/Release/mtouch-cache/registrar.m
2017-11-17T07:13:44.5215310Z   In file included from /Users/vsts/agent/2.124.0/work/1/s/src/Mobile/XYZ/obj/iPhone/Release/mtouch-cache/registrar.m:2:
2017-11-17T07:13:44.5316500Z   /Users/vsts/agent/2.124.0/work/1/s/src/Mobile/XYZ/obj/iPhone/Release/mtouch-cache/registrar.h:13:9: fatal error: 'QuartzCore/CAEmitterBehavior.h' file not found
2017-11-17T07:13:44.5414550Z   #import <QuartzCore/CAEmitterBehavior.h>
2017-11-17T07:13:44.5516440Z           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2017-11-17T07:13:44.5617400Z   1 error generated.
2017-11-17T07:13:44.5717940Z   
2017-11-17T07:13:47.6911810Z MTOUCH : error MT4109: Failed to compile the generated registrar code. Please file a bug report at http://bugzilla.xamarin.com [/Users/vsts/agent/2.124.0/work/1/s/src/Mobile/XYZ/XYZ.csproj]
2017-11-17T07:13:47.9615670Z 

[bojanmisic]

Seems that this is no longer an issue, it works now without the “hack”.

[bojanmisic]

I had the same problem, and fixed it by adding ShellScript task:

#!/bin/bash
/Users/vsts/agent/2.124.0/scripts/select-xamarin-sdk.sh Stable

as noted here.