[.NET 6] External dotnet issues

[rolfbjarne]

This issue lists all issues from any dotnet/* repository that affect our .NET 6 effort (so far dotnet/runtime, dotnet/sdk and dotnet/roslyn).

Issues in the mono/linker repository are listed in #12657.

The checkbox should be checked once the external issue is fixed, and the issue
moved down to "Fixed in <external repo>". When we've removed any workarounds or
implemented other related behavior to the issue in question (or verified that nothing else needs to be done)
the issue should be moved down to "Fixed in our repo".

Equivalent issue for .NET 7: #14548.

Known breaking changes in .NET 6+ should be listed here: #8900.
Known breaking changes in CoreCLR should be listed here: #10795.

• P0: something that's blocking other work for us
• P1: something we can't go to stable with
• P2: neither P0 nor P1

P0

P1

P2

Moved to .NET 7 (#14548).

• Marshal.AllocHGlobal/FreeHGlobal is ~150x slower in .NET than legacy mono on device (tvOS): moved to .NET 7

Fixed in the dotnet repo

• Mono: the runtime packages for .NET 6+ do not contain the runtime as a .framework for iOS/tvOS/watchOS
  • Ref: Ship a .framework version of Mono
• macOS / Mac Catalyst / iOS: CurrentThread.Current[UI]Culture is always the invariant culture

Fixed in our repo

• [XmlSerializer tries to use Reflection.Emit even if RuntimeFeature.IsDynamicCodeSupported is false](XmlSerializer tries to use Reflection.Emit even if RuntimeFeature.IsDynamicCodeSupported is false dotnet/runtime#59167)
  • [tests] Remove ignore for test that has been fixed in .NET. #14255
• Console.Write prints a new line on iOS
• [dotnet] Missing mono-cil-strip (or alternative)
• DOTNETSDK_WORKLOAD_MANIFEST_ROOTS pointing to workloads that are not lowercased fails Worked around.
• Mono: UnmanagedCallersOnly functions with ref parameters aren't considered blittable by the AOT compiler By design
• [mono][aot] .aotdata files size increase compared to legacy mono
• macOS (Xamarin): failure to build X509Chain
• iOS: LLVM fails for ios-arm
  • Revert when fixed: xamarin/SubmissionSamples@df09867
• iOS: building with LLVM causes some exception catch clauses to not work
• * [x] Binary addition of interpolated strings mangles the string
• Mono: The PINVOKE_OVERRIDE callback doesn't work when AOT-compiling code with direct-pinvoke
  • Revert: [dotnet-linker] Remove workaround for a dotnet/runtime issue wrt the AOT compiler. #12528
• Add back ObsoletedInOSPlatformAttribute for net6
  • blocker for Decorate all APIs with correct SupportedOSPlatform attributes #10170 we use [Obsolete] as a close match
• iOS/AOT: XmlSerializer.Deserialize throws Attempting to JIT compile method 'void Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializerContract:.ctor ()' while running in aot-only mode.
• iOS: Attempting to JIT compile method '(wrapper dynamic-method) string object:lambda_method1 (System.Runtime.CompilerServices.Closure)' while running in aot-only mode.
  • Revert: [tests] Remove some ignores for issues that have been fixed. #12527.
• iOS: Attempting to JIT compile method '(wrapper dynamic-method) void object:WriteArrayOfintToXml (System.Runtime.Serialization.XmlWriterDelegator,object,System.Runtime.Serialization.XmlObjectSerializerWriteContext,System.Runtime.Serialization.CollectionDataContract)' while running in aot-only mode.
  • Revert: [tests] Remove some ignores for issues that have been fixed. #12527.
• [x] iOS (and other Apple platforms): System.Private.CoreLib.dll has P/Invokes to a libhostpolicy library that isn't shipped
  • Revert once fixed: 919edef
  • Revert: [tests] Remove some ignores for issues that have been fixed. #12527.
• AppHost should be disabled by default for macOS like it is for iOS / tvOS / Mac Catalyst / Android
• How to handle Runtime Pack naming when targeting > 1 VM
  • Revert/update once fixed: fa50f40
• Mono: AOT compiler can't compile System.Net.SafeDeleteSslContext:ReadFromConnection (Mac Catalyst)
• iOS (and other Apple platforms): the BCL has P/Invokes to libraries and/or functions that don't exist
  • Revert once fixed: cf2b3c4
  • It might be possible to revert code elsewhere as well.
  • Reverted: [tools] Revert workaround for dotnet/runtime#45535. #12011.
• It's not possible for a workload to set a default RuntimeIdentifier
• iOS/tvOS/MacCatalyst: some HttpClientHandler properties behave differently now
• There doesn't seem to be a way to execute tasks or targets for 'dotnet run'
  Not fixed, but we found a workaround: 9930ddc
• Symbols required for AOT are private in libmonosgen-2.0.dylib
• [tvOS] System.Net.Security depends on non-existant System.Net.Security.Native
  • Revert once fixed: 39948aa
• iOS: error: Ran out of trampolines of type 1 in '/private/var/containers/Bundle/Application/D4741AA0-B7E1-442E-AAA2-BFD48F71C744/dont link.app/System.Private.CoreLib.dll' (limit 0).
• ThreadPool and Xamarin platform integration
  • Revert once fixed: [monotouch-test] Ignore an autoreleasepool threadpool test which is a known issue in .NET. #9465
  • [ObjCRuntime] Implement Runtime.UseAutoreleasePoolInThreadPool for .NET. #12248.
• [.NET] Only the invariant culture works
  • Revert once fixed: 6fd9e15, [tests] Adjust resources test to cope with the fact that only the invariant culture is currently shipping in .NET 5. #9498
  • blocked on AppContext.GetData always return null for iOS dotnet/runtime#50290
  • tvOS support is still missing -> [tvOS][globalization] Missing support for ICU dotnet/runtime#50912 fix
  • Calendar tests are still failing (iOS) w/ICU -> [iOS] Calendar not behaving correctly wrt culture dotnet/runtime#50859
  • Catalyst does not ship with ICU support -> [dotnet] Native ICU libraries not ready for Catalyst #11392
• iOS: Attempting to JIT compile method '(wrapper native-to-managed) void System.Net.NetworkInformation.BsdNetworkInterface/<>c__DisplayClass5_0:b__0 (intptr,Interop/Sys/IpAddressInfo*)' while running in aot-only mode.
  • [tests] Remove workaround for #dotnet/runtime@47120, it's been fixed. #12253
• MonoVM: Missing runtime workloads for Mac Catalyst and macOS
• RuntimeConfigParserTasksAssemblyPath in Microsoft.NET.Runtime.RuntimeConfigParser.Task is wrong
• Mono: the runtime packages for .NET 6+ for iOS/tvOS/watchOS do not contain the static libraries required for interpreter support
• Microsoft.NET.Workload.Mono.Toolchain does not get me the arm64 AOT compiler for Mac Catalyst
• [Launching dotnet using mono on macOS will hang if dotnet launches processes](Launching dotnet using mono on macOS will hang if dotnet launches processes dotnet/runtime#55645)~
• 'dotnet run -- args' requires 'args' to exist
• Mac Catalyst: TimeZoneInfo.FindSystemTimeZoneById fails Dup of [dotnet] Native ICU libraries not ready for Catalyst #11392
• MonoVM's arm64 binaries for macOS don't have Apple Silicon support
• iOS/MonoVM: waiting doesn't wait
• iOS: NullReferenceException in HttpConnectionPool when using HttpWebRequest
  • Revert once fixed: 904e81f -> reverted
• Add Mono.osx-arm64 runtime pack and produce new runtime pack
• tvOS: Mono runtime for device is missing bitcode (P4 bump fixed that)
• Mac Catalyst: Need dllmap support
  • Use PINVOKE_CALLBACK instead: 9153ede
• Mac Catalyst: GC doesn't collect object with finalizers
• iOS: System.Runtime.Loader.AssemblyLoadContext.MonoResolveUnmanagedDllUsingEvent is linked away when still needed
  • Revert once fixed:
    • rolfbjarne@ece7188 -> reverted
    • 29727d6 -> reverted
• AOT compiler for .NET/iOS not built with MONOTOUCH defined
• [mono] iOS FullAOT crashes with condition `method->is_inflated' not met
• System.Security tests fail on iOS
  • Revert once fixed: [dotnet/monotouch-test] Disable tests that require Crypto for .NET. #9463, 6a2f1db (#9509), e8c3891 (#9509), https://github.com/xamarin/xamarin-macios/search?q=36897&unscoped_q=36897
  • Reverted: 2ecbb07
• Dynamic libraries in the microsoft.netcore.app.runtime.ios-x64 package has incorrect identity
  • Revert once fixed: be3568f: 7ac5b95
• Type.IsInterface returns different values between .NET and Mono for reference types
  • Revert once fixed: [ObjCRuntime] Work around a difference in .NET where Type.IsInterface doesn't work the same way for byref types. #9466 By design
• iOS: System.Net.NetworkInformation.Ping.Send throws System.Net.NetworkInformation.PingException: An exception occurred during a Ping request
  • Revert once fixed: 77f9a4d (#9509)
  • Reverted: 974aad0
• iOS: Some of the Environment.SpecialFolders values are incorrect with regards to Xamarin.iOS
  • Revert once fixed: eb79bcc (#9509)
  • Revert PR: rolfbjarne@88c1a34
• Linq.Queryable.FirstOrDefault doesn't work when using TrimMode=link
  • Revert once fixed: ae0649f (#9509)
  • Reverted with Revert "[tests] Ignore LinkSdkRegressionTest.AsQueryable_Enumerable due to an issue in .NET" #11041 f663072
• MonoVM: add back dllmap support for macOS
  • Revert once fixed: [tools] Disable Objective-C exception handling for macOS .NET apps due to a missing feature in the runtime. #10123
  • Reverted: 9153ede
• Mono: ConstructorInfo.ToString () returns unexpected format
  • Revert once fixed: f69ed9a
  • Reverted: Revert "[introspection] Adapt to .NET 5's vision of how ConstructorInfo.ToString () should behave." #9738
• Allow using SupportedOSPlatformAttribute on interfaces
• ICU / TimeZone hang in P4
  • revert 5fdd4e2 -> reverted
• .NET 5: can't build F# projects
  • Revert once fixed:

    xamarin-macios/tests/fsharplibrary/dotnet/shared.targets

    Lines 12 to 13 in 6a1e8ac

    	<!-- Work around https://github.com/dotnet/sdk/issues/12954 -->
    	<ProduceReferenceAssembly>false</ProduceReferenceAssembly>

  • Reverted: [dotnet] Remove workaround for F# projects #9845