Could not AOT the assembly System.Runtime.CompilerServices.Unsafe.dll (MT3001)

[juripyykko]

Steps to Reproduce

1. Create new Cross-Platform Xamarin.Forms .NET Standard 2.0 project in Visual Studio (i used 2017 PC).
2. Open this project in Visual Studio for Mac.
3. Add NuGet Microsoft.EntityFrameworkCore.Sqlite to the iOS project.
4. Add the following for example to AppDelegate.cs in the iOS project:
   var temp = Microsoft.EntityFrameworkCore.PropertyAccessMod.Field;
5. Try to run this on an iPhone (which I believe requires some config, e.g. bundle identifier etc.)

Expected Behavior

App starting on device showing the default MainPage.

Actual Behavior

Error:

Could not AOT the assembly '/Users/masystem/Dev/TestProjects/TestReproduceError/TestReproduceError/TestReproduceError.iOS/obj/iPhone/Debug/device-builds/iphone9.3-11.1.2/mtouch-cache/Build/System.Runtime.CompilerServices.Unsafe.dll' (MT3001)

Environment

Visual Studio on PC

Microsoft Visual Studio Professional 2017 
Version 15.5.1
VisualStudio.15.Release/15.5.1+27130.2003
Microsoft .NET Framework
Version 4.7.02556

Installed Version: Professional

Visual Basic 2017   00370-20004-56726-AA880
Microsoft Visual Basic 2017

Visual C# 2017   00370-20004-56726-AA880
Microsoft Visual C# 2017

Visual F# 4.1   00370-20004-56726-AA880
Microsoft Visual F# 4.1

Application Insights Tools for Visual Studio Package   8.10.01106.1
Application Insights Tools for Visual Studio

ASP.NET and Web Tools 2017   15.0.31125.0
ASP.NET and Web Tools 2017

ASP.NET Core Razor Language Services   1.0
Provides languages services for ASP.NET Core Razor.

ASP.NET Web Frameworks and Tools 2017   5.2.51007.0
For additional information, visit https://www.asp.net/

Azure App Service Tools v3.0.0   15.0.31106.0
Azure App Service Tools v3.0.0

Azure Data Lake Node   1.0
This package contains the Data Lake integration nodes for Server Explorer.

Azure Data Lake Tools for Visual Studio   2.2.9000.1
Microsoft Azure Data Lake Tools for Visual Studio

Azure Data Lake Tools for Visual Studio   2.2.9000.1
Microsoft Azure Data Lake Tools for Visual Studio

Common Azure Tools   1.10
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

Fabric.DiagnosticEvents   1.0
Fabric Diagnostic Events

JavaScript Language Service   2.0
JavaScript Language Service

JavaScript Project System   2.0
JavaScript Project System

JavaScript UWP Project System   2.0
JavaScript UWP Project System

Merq   1.1.17-rc (cba4571)
Command Bus, Event Stream and Async Manager for Visual Studio extensions.

Microsoft Azure HDInsight Azure Node   2.2.9000.1
HDInsight Node under Azure Node

Microsoft Azure Hive Query Language Service   2.2.9000.1
Language service for Hive query

Microsoft Azure Service Fabric Tools for Visual Studio   1.8
Microsoft Azure Service Fabric Tools for Visual Studio

Microsoft Azure Stream Analytics Language Service   2.2.9000.1
Language service for Azure Stream Analytics

Microsoft Azure Stream Analytics Node   1.0
Azure Stream Analytics Node under Azure Node

Microsoft Azure Tools   2.9
Microsoft Azure Tools for Microsoft Visual Studio 2017 - v2.9.51120.3

Microsoft Continuous Delivery Tools for Visual Studio   0.3
Simplifying the configuration of continuous build integration and continuous build delivery from within the Visual Studio IDE.

Microsoft JVM Debugger   1.0
Provides support for connecting the Visual Studio debugger to JDWP compatible Java Virtual Machines

Microsoft MI-Based Debugger   1.0
Provides support for connecting Visual Studio to MI compatible debuggers

Microsoft Visual Studio Tools for Containers   1.1
Develop, run, validate your ASP.NET Core applications in the target environment. F5 your application directly into a container with debugging, or CTRL + F5 to edit & refresh your app without having to rebuild the container.

Microsoft Visual Studio VC Package   1.0
Microsoft Visual Studio VC Package

Mono Debugging for Visual Studio   4.8.4-pre (3fe64e3)
Support for debugging Mono processes with Visual Studio.

NuGet Package Manager   4.5.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.

SQL Server Data Tools   15.1.61710.120
Microsoft SQL Server Data Tools

ToolWindowHostedEditor   1.0
Hosting json editor into a tool window

TypeScript Tools   15.5.11025.1
TypeScript Tools for Microsoft Visual Studio

WebJobs Tools v1.0.0   15.0.31201.0
WebJobs Tools v1.0.0

Visual Studio Code Debug Adapter Host Package   1.0
Interop layer for hosting Visual Studio Code debug adapters in Visual Studio

Visual Studio Tools for Universal Windows Apps   15.0.27128.01
The Visual Studio Tools for Universal Windows apps allow you to build a single universal app experience that can reach every device running Windows 10: phone, tablet, PC, and more. It includes the Microsoft Windows 10 Software Development Kit.

VisualStudio.Mac   1.0
Mac Extension for Visual Studio

Xamarin   4.8.0.753 (6575bd113)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin Designer   4.8.183 (2577c82ea)
Visual Studio extension to enable Xamarin Designer tools in Visual Studio.

Xamarin.Android SDK   8.1.0.24 (HEAD/9cfa7836b)
Xamarin.Android Reference Assemblies and MSBuild support.

Xamarin.iOS and Xamarin.Mac SDK   11.6.1.2 (6857dfc)
Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support.

Visual Studio on Mac

=== Visual Studio Community 2017 for Mac ===

Version 7.3.3 (build 5)
Installation UUID: 53fae928-0326-4001-840c-b7d7eff46e01
Runtime:
Mono 5.4.1.7 (2017-06/e66d9abbb27) (64-bit)
GTK+ 2.24.23 (Raleigh theme)

Package version: 504010007

=== NuGet ===

Version: 4.3.1.4445

=== .NET Core ===

Runtime: /usr/local/share/dotnet/dotnet
Runtime Version: 2.0.0
SDK: /usr/local/share/dotnet/sdk/2.0.0/Sdks
SDK Version: 2.0.0
MSBuild SDKs: /Library/Frameworks/Mono.framework/Versions/5.4.1/lib/mono/msbuild/15.0/bin/Sdks

=== Xamarin.Profiler ===

Version: 1.6.0
Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler

=== Xamarin.Android ===

Version: 8.1.3.0 (Visual Studio Community)
Android SDK: /Users/masystem/Library/Developer/Xamarin/android-sdk-macosx
Supported Android versions:
7.1 (API level 25)
8.0 (API level 26)

SDK Tools Version: 25.2.5
SDK Platform Tools Version: 25.0.5
SDK Build Tools Version: 25.0.3

Java SDK: /usr
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)

Android Designer EPL code available here:
https://github.com/xamarin/AndroidDesigner.EPL

=== Xamarin Inspector ===

Version: 1.3.2
Hash: 461f09a
Branch: 1.3-release
Build date: Tue, 03 Oct 2017 18:26:57 GMT
Client compatibility: 1

=== Apple Developer Tools ===

Xcode 9.2 (13772)
Build 9C40b

=== Xamarin.iOS ===

Version: 11.6.1.3 (Visual Studio Community)
Hash: f70a1348
Branch: xcode9.2
Build date: 2017-12-18 14:47:16-0500

=== Xamarin.Mac ===

Version: 4.0.0.215 (Visual Studio Community)

=== Build Information ===

Release ID: 703030005
Git revision: b1c2982e201e71ef758866c9ade05f253a8c6f47
Build date: 2017-12-21 11:04:40-05
Xamarin addins: f397ddfbacfb39e60c9cc8d9e410f73faf8c2cbc
Build lane: monodevelop-lion-d15-5

=== Operating System ===

Mac OS X 10.12.6
Darwin 16.7.0 Darwin Kernel Version 16.7.0
    Thu Jun 15 17:36:27 PDT 2017
    root:xnu-3789.70.16~2/RELEASE_X86_64 x86_64

=== Enabled user installed addins ===

Internet of Things (IoT) development (Preview) 7.1

Build Logs

build.txt

Example Project (If Possible)

[spouliot]

Thanks for the report. This should be already fixed in the current previews (i.e. upgrade to the beta channel).
Duplicate of https://bugzilla.xamarin.com/show_bug.cgi?id=60771

[juripyykko]

I've changed to beta channel on the Mac, but I still get the same error. Do I need to recreate the whole project on the beta channel versions? @spouliot

[spouliot]

@juripyykko make sure you do a clean on your solution before building with the beta. If it still happens attach your test case (clean, zip and drag'n'drop into a comment text box) and re-ope the issue.

[juripyykko]

TestReproduceError.zip

Same problem persists after clean build with the beta.
@spouliot I don't seem to be able to re-open an issue I didn't close, could you do that please?

[timrisi]

@juripyykko I reopened the issue for you. Do you have a test case you can provide?