issue-link js-issue-link" data-error-text="Failed to load title" data-id="967799640" data-permission-text="Title is private" data-url="https://github.com/dotnet/roslyn/issues/55564" data-hovercard-type="issue" data-hovercard-url="/dotnet/roslyn/issues/55564/hovercard" href="https://github.com/dotnet/roslyn/issues/55564">dotnet/roslyn#55564 Context: https://discord.com/channels/732297728826277939/732297837953679412/874959446747533323 Context: dotnet/runtime#55992 Context: dotnet/sdk#19653 (comment) Fix the Java.Interop build when .NET 6 Preview 7 is installed. .NET 6 Preview 7 introduced a C# compiler regression: use of [C#6 string interpolation][0] with `StringBuilder.Append()` when `$(LangVersion)` < 10.0 results in a CS8400 error: error CS8400: Feature 'interpolated string handlers' is not available in C# 8.0. Please use language version 10.0 or greater. Because `azure-pipelines.yaml` specifies `DotNetCoreVersion: 6.0.x`, our CI machines get auto-bumped to .NET 6 Preview 7, causing *all* PR builds to now fail with this CS8400 failure. There are two possible solutions: 1. *Avoid* .NET 6 Preview 7. 2. Remove select use of string interpolation. (1) was initially done on dotnet#865, by using: DotNetCoreVersion: 6.0.100-preview.6.21355.2 However, it's not *all* use of string interpolation which triggers the CS8400 error. It's just use of string interpolation within `StringBuilder.Append()` calls, in 3 locations. Update `RegisterAttr.cs` to use a `(string)` cast with the existing string interpolation use. This works around the CS8400 error. *Additionally*, macOS+Mono builds would fail in `make all` when .NET 6 Preview 7 is present: /usr/local/share/dotnet/sdk/6.0.100-preview.7.21379.14/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(536,5): error MSB4018: The "CreateAppHost" task failed unexpectedly. /usr/local/share/dotnet/sdk/6.0.100-preview.7.21379.14/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(536,5): error MSB4018: System.InvalidOperationException: The Process object must have the UseShellExecute property set to false in order to redirect IO streams. /usr/local/share/dotnet/sdk/6.0.100-preview.7.21379.14/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(536,5): error MSB4018: at System.Diagnostics.Process.StartWithShellExecuteEx (System.Diagnostics.ProcessStartInfo startInfo) /usr/local/share/dotnet/sdk/6.0.100-preview.7.21379.14/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(536,5): error MSB4018: at System.Diagnostics.Process.Start () /usr/local/share/dotnet/sdk/6.0.100-preview.7.21379.14/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(536,5): error MSB4018: at (wrapper remoting-invoke-with-check) System.Diagnostics.Process.Start() /usr/local/share/dotnet/sdk/6.0.100-preview.7.21379.14/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(536,5): error MSB4018: at System.Diagnostics.Process.Start (System.Diagnostics.ProcessStartInfo startInfo) /usr/local/share/dotnet/sdk/6.0.100-preview.7.21379.14/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(536,5): error MSB4018: at Microsoft.NET.HostModel.AppHost.HostWriter.CodeSign (System.String appHostPath) /usr/local/share/dotnet/sdk/6.0.100-preview.7.21379.14/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(536,5): error MSB4018: at Microsoft.NET.HostModel.AppHost.HostWriter.CreateAppHost (System.String appHostSourceFilePath, System.String appHostDestinationFilePath, System.String appBinaryFilePath, System.Boolean windowsGraphicalUserInterface, System.String assemblyToCopyResorcesFrom, System.Boolean enableMacOSCodeSign) /usr/local/share/dotnet/sdk/6.0.100-preview.7.21379.14/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(536,5): error MSB4018: at Microsoft.NET.Build.Tasks.CreateAppHost.ExecuteCore () /usr/local/share/dotnet/sdk/6.0.100-preview.7.21379.14/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(536,5): error MSB4018: at Microsoft.NET.Build.Tasks.TaskBase.Execute () /usr/local/share/dotnet/sdk/6.0.100-preview.7.21379.14/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(536,5): error MSB4018: at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute () /usr/local/share/dotnet/sdk/6.0.100-preview.7.21379.14/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(536,5): error MSB4018: at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask (Microsoft.Build.BackEnd.ITaskExecutionHost taskExecutionHost, Microsoft.Build.BackEnd.Logging.TaskLoggingContext taskLoggingContext, Microsoft.Build.BackEnd.TaskHost taskHost, Microsoft.Build.BackEnd.ItemBucket bucket, Microsoft.Build.BackEnd.TaskExecutionMode howToExecuteTask) This was filed as dotnet/runtime#55992, and can be worked around by setting `$(UseAppHost)`=False. [0]: https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/tokens/interpolated

Commits

Commits on Aug 19, 2021

[build] .NET 6 P7 Support