MT0000 - System.IO.FileNotFoundException: Could not find file "/Users/username/TFS/MyApp/.App.iOS/obj/iPhone/Debug/device-builds/iphone8.1-14.4/mtouch-cache/arm64/.App.iOS"

[KMWenyon]

Xamarin Forms iOS v8.x

=== Visual Studio Enterprise 2019 for Mac ===

Version 8.9.10 (build 4)
Installation UUID: e5958dcd-8ee8-47ff-938b-9f57e9f66c2c
GTK+ 2.24.23 (Raleigh theme)
Xamarin.Mac 6.18.0.23 (d16-6 / 088c73638)

Package version: 612000125

=== Mono Framework MDK ===

Runtime:
Mono 6.12.0.125 (2020-02/8c552e98bd6) (64-bit)
Package version: 612000125

=== Roslyn (Language Service) ===

3.9.0-6.21152.10+c10f884b30737542ddd84ca889a4aad9281ce210

=== NuGet ===

Version: 5.8.0.6860

=== .NET Core SDK ===

SDK: /usr/local/share/dotnet/sdk/5.0.203/Sdks
SDK Versions:
5.0.203
5.0.201
3.1.409
3.1.407
3.1.401
3.1.302
3.1.301
3.1.300
3.1.202
3.1.200
3.1.102
3.1.101
3.1.100
3.0.101
3.0.100
2.1.701
2.1.700
MSBuild SDKs: /Applications/Visual Studio.app/Contents/Resources/lib/monodevelop/bin/MSBuild/Current/bin/Sdks

=== .NET Core Runtime ===

Runtime: /usr/local/share/dotnet/dotnet
Runtime Versions:
5.0.6
5.0.4
3.1.15
3.1.13
3.1.7
3.1.6
3.1.5
3.1.4
3.1.2
3.1.1
3.1.0
3.0.1
3.0.0
2.1.23
2.1.21
2.1.20
2.1.19
2.1.18
2.1.17
2.1.16
2.1.15
2.1.14
2.1.13
2.1.12
2.1.11

=== .NET Core 3.1 SDK ===

SDK: 3.1.409

=== Xamarin.Profiler ===

Version: 1.6.15.68
Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler

=== Updater ===

Version: 11

=== Apple Developer Tools ===

Xcode 12.5 (18205)
Build 12E262

=== Xamarin.Mac ===

Version: 7.10.0.5 (Visual Studio Enterprise)
Hash: ab40b131d
Branch: xcode12.5
Build date: 2021-04-22 08:56:41-0400

=== Xamarin.iOS ===

Version: 14.16.0.5 (Visual Studio Enterprise)
Hash: ab40b131d
Branch: xcode12.5
Build date: 2021-04-22 08:56:42-0400

=== Xamarin Designer ===

Version: 16.9.0.324
Hash: b1e216c75
Branch: remotes/origin/d16-9
Build date: 2021-04-16 00:02:50 UTC

=== Xamarin.Android ===

Version: 11.2.2.1 (Visual Studio Enterprise)
Commit: xamarin-android/d16-9/877f572
Android SDK: /Users/kenwenyon/Library/Android/sdk
Supported Android versions:
5.0 (API level 21)
5.1 (API level 22)
6.0 (API level 23)
7.0 (API level 24)
7.1 (API level 25)
8.0 (API level 26)
8.1 (API level 27)

SDK Tools Version: 26.1.1
SDK Platform Tools Version: 31.0.2
SDK Build Tools Version: 31.0.0 rc4

Build Information:
Mono: 5e9cb6d
Java.Interop: xamarin/java.interop/d16-9@54f8c24
ProGuard: Guardsquare/proguard@912d149
SQLite: xamarin/sqlite@daff8f4
Xamarin.Android Tools: xamarin/xamarin-android-tools/d16-9@d210f11

=== Microsoft OpenJDK for Mobile ===

Java SDK: /Users/kenwenyon/Library/Developer/Xamarin/jdk/microsoft_dist_openjdk_1.8.0.25
1.8.0-25
Android Designer EPL code available here:
https://github.com/xamarin/AndroidDesigner.EPL

=== Android SDK Manager ===

Version: 16.9.0.22
Hash: a391de2
Branch: remotes/origin/dev/bretjohn/readme-tweak~3
Build date: 2021-05-13 17:03:56 UTC

=== Android Device Manager ===

Version: 16.9.0.17
Hash: fc2b3db
Branch: remotes/origin/dev/jmt/d16-9bump~1
Build date: 2021-05-13 17:04:12 UTC

=== Build Information ===

Release ID: 809100004
Git revision: 30612572b7defb0273729cb6b5ea5adc8bd9a147
Build date: 2021-05-13 13:06:24-04
Build branch: release-8.9
Xamarin extensions: 30612572b7defb0273729cb6b5ea5adc8bd9a147

=== Operating System ===

Mac OS X 10.16.0
Darwin 20.4.0 Darwin Kernel Version 20.4.0
Thu Apr 22 21:46:47 PDT 2021
root:xnu-7195.101.2~1/RELEASE_X86_64 x86_64

=== Enabled user installed extensions ===

XAML Styler 2.0.1
NuGet Package Management Extensions 0.26
NuGet Package Explorer 0.6

Build Logs
warning MT5203 : Native linking warning : Can't access /Users/username/TFS/MyApp/App.iOS/obj/iPhone/Debug/device-builds/iphone8.1-14.4/mtouch-cache/arm64/App.iOS

MTOUCH : error MT0000: Unexpected error - Please file a bug report at https://github.com/xamarin/xamarin-macios/issues/new
System.IO.FileNotFoundException: Could not find file "/Users/username/TFS/MyApp/App.iOS/obj/iPhone/Debug/device-builds/iphone8.1-14.4/mtouch-cache/arm64/App.iOS"
File name: '/Users/usename/TFS/MyApp/App.iOS/obj/iPhone/Debug/device-builds/iphone8.1-14.4/mtouch-cache/arm64/App.iOS'
at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.Boolean anonymous, System.IO.FileOptions options) [0x00259] in /Users/builder/jenkins/workspace/build-package-osx-mono/2020-02/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.IO/FileStream.cs:274
at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share) [0x00000] in /Users/builder/jenkins/workspace/build-package-osx-mono/2020-02/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.IO/FileStream.cs:91
at (wrapper remoting-invoke-with-check) System.IO.FileStream..ctor(string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare)
at Xamarin.MachO.ReadFile (System.String filename) [0x00001] in /Users/builder/azdo/_work/1/s/xamarin-macios/tools/common/MachO.cs:230
at Xamarin.MachO+d__16.MoveNext () [0x00048] in /Users/builder/azdo/_work/1/s/xamarin-macios/tools/common/MachO.cs:239
at Xamarin.MachO.GetNativeDependencies (System.String libraryName) [0x000bb] in /Users/builder/azdo/_work/1/s/xamarin-macios/tools/common/MachO.cs:368
at Xamarin.Bundler.Target.AdjustDylibs (System.String output) [0x00008] in /Users/builder/azdo/_work/1/s/xamarin-macios/tools/mtouch/Target.mtouch.cs:1648
at Xamarin.Bundler.NativeLinkTask.ExecuteAsync () [0x00568] in /Users/builder/azdo/_work/1/s/xamarin-macios/tools/mtouch/BuildTasks.mtouch.cs:335
at Xamarin.Bundler.BuildTask.Execute (Xamarin.Bundler.BuildTasks build_tasks) [0x002a9] in /Users/builder/azdo/_work/1/s/xamarin-macios/tools/common/BuildTasks.cs:259
at Xamarin.Bundler.BuildTask.Execute (Xamarin.Bundler.BuildTasks build_tasks) [0x0038c] in /Users/builder/azdo/_work/1/s/xamarin-macios/tools/common/BuildTasks.cs:274
at Xamarin.Bundler.BuildTask.Execute (Xamarin.Bundler.BuildTasks build_tasks) [0x00368] in /Users/builder/azdo/_work/1/s/xamarin-macios/tools/common/BuildTasks.cs:270
at Xamarin.Bundler.BuildTasks+<>c__DisplayClass4_0.b__0 () [0x0002e] in /Users/builder/azdo/_work/1/s/xamarin-macios/tools/common/BuildTasks.cs:50
The command exited with code 1.
Done executing task "MTouch" -- FAILED.
Done building target "_CompileToNative" in project "App.iOS.csproj" -- FAILED.

Done building project "App.iOS.csproj" -- FAILED.

FROM MICROSOFT:

We have been able to reproduce the issue with the current hash in main (1b6c83e) yet looking at the logs this does not seem to be an issue with our product due to the following:

Looking at the build logs and using the sample application we have found that the black berry third party product uses a none standard linker found at ~/Library/Application Support/BlackBerry/Good.platform/iOS/FIPS_module/arm64.sdk/bin/ld
The linker provided by Black Berry fails when trying to perform its work, one of the linking warnings that we find interesting is 'building for iOS, but linking in object file built for free standing, for architecture arm64'
One of the steps when building the application, which is not part of our standard msbuild tasks, does the following: Removing /Users/mandel/Downloads/BlackBerry_Dynamics_SDK_for_XamarinForms_v8-2/XamarinForms/Examples/BlankApp/iOS/obj/iPhone/Release/mtouch-cache/arm64/BlankApp.iOS
Our tools fail because they try to find the path /Users/mandel/Downloads/BlackBerry_Dynamics_SDK_for_XamarinForms_v8-2/XamarinForms/Examples/BlankApp/iOS/obj/iPhone/Release/mtouch-cache/arm64/BlankApp.iOS which is removed as per point 3. The removal of the .app is not part of our build, we will never use the logs for the linker to remove the .app as it shows in the build logs

warning MT5203 : Native linking warning : Removing /Users/mandel/Downloads/BlackBerry_Dynamics_SDK_for_XamarinForms_v8-2/XamarinForms/Examples/BlankApp/iOS/obj/iPhone/Release/mtouch-cache/arm64/BlankApp.iOS
There are certain parts of the build that do worry me, does look like there are several debug prints from the company that wrote the linker, for example:

warning MT5203 : Native linking warning : Getting Clang Path
warning MT5203 : Native linking warning : GOT TO HERE
warning MT5203 : Native linking warning : Going to plan A, using /Users/mandel/Library/Application Support/BlackBerry/Good.platform/iOS/FIPS_module/arm64.sdk/bin/../bin/incore_macho
All of the above are not coming from any of our tools.

All this have been tested with our current stable and the Black Berry Dynamics releases found in https://developers.blackberry.com/us/en/resources/downloads.html, the versions used are:

Static framework SDK for iOS: 8.1.0.37
Black Berry Launcher Library: 3.1.1.279
Xamarin Forms Dynamics SDK: 8.0.0.42
The builds logs of my tests are found in the following gist: https://gist.github.com/mandel-macaque/e159c0fe98b6205f04e5c455c7373cda (you will need to click view raw to view all of it due to its size). My understanding from our communications is that this stopped working when you upgraded. Was this upgrade due to upgrading Xcode to Xcode12.4? It might be the case that BlackBerry Dynamics is not working correctly with your current configuration and our tools are the ones that expose it yet are not the culprit.

This is not a Xamarin issue...
Please see: xamarin/xamarin-macios#10945 for full steps to reproduce and to remediate.

[KMWenyon]

This also reproducible using your own sample from the Xamarin.Forms SampleAppSuite app from the latest BBD Xamarin.Forms SDK 8.0.0.42 using the latest version of Xamarin.Forms, XCode and VisualStudio for Mac with Big Sur.