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CS8400: Feature 'interpolated string handlers on building with net6.0 and LangVersion 8.0 #55564

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jeromelaban opened this issue Aug 12, 2021 · 2 comments
Closed

CS8400: Feature 'interpolated string handlers on building with net6.0 and LangVersion 8.0 #55564

jeromelaban opened this issue Aug 12, 2021 · 2 comments
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Area-Compilers untriaged Issues and PRs which have not yet been triaged by a lead

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@jeromelaban
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Version Used: Version 17.0.0 Preview 3.0

Steps to Reproduce:

Compile the following code:

class Test01
{
	static void C()
	{
		var uri = new System.Text.StringBuilder();
		byte b = 0x0;
		uri.Append($"%{b:X2}");
	}
}

With the following project configuration:

  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <DisableImplicitNamespaceImports>true</DisableImplicitNamespaceImports>
    <Nullable>enable</Nullable>
    <LangVersion>8.0</LangVersion>
  </PropertyGroup>

Expected Behavior:
The code compiles

Actual Behavior:

error CS8400: Feature 'interpolated string handlers' is not available in C# 8.0. Please use language version 10.0 or greater.
@dotnet-issue-labeler dotnet-issue-labeler bot added Area-Compilers untriaged Issues and PRs which have not yet been triaged by a lead labels Aug 12, 2021
@reflectronic
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This is fixed by #55380.

@svick
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svick commented Aug 12, 2021

Closing as duplicate of #55345 (the issue that was fixed by #55380).

@svick svick closed this as completed Aug 12, 2021
jonpryor added a commit to jonpryor/java.interop that referenced this issue Aug 19, 2021
@jonpryor
[generator] Avoid interpolated strings
952a6cd 
Context: dotnet/roslyn#55564
Context: https://discord.com/channels/732297728826277939/732297837953679412/874959446747533323

.NET 6 Preview 7 introduced a compiler regression: use of
[C#6 string interpolation][0] 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
`RegisterAttr.cs`, in 3 locations.

Update `RegisterAttr.cs` to use `StringBuilder.Append()` calls
instead of string interpolation.  The resulting code is slightly
more annoying to read, but should perform better (slightly), and
avoids the CS8400 error.

[0]: https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/tokens/interpolated
@jonpryor jonpryor mentioned this issue Aug 19, 2021
Merged
jonpryor added a commit to jonpryor/java.interop that referenced this issue Aug 19, 2021
@jonpryor
[generator] Work around dotnet/roslyn#55564
e339373 
Context: dotnet/roslyn#55564
Context: https://discord.com/channels/732297728826277939/732297837953679412/874959446747533323

.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.

[0]: https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/tokens/interpolated
jonpryor added a commit to jonpryor/java.interop that referenced this issue Aug 19, 2021
@jonpryor
[build] .NET 6 P7 Support
f3eb604 
Context: 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 in the "offending" projects.

[0]: https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/tokens/interpolated
jonpryor added a commit to jonpryor/java.interop that referenced this issue Aug 19, 2021
@jonpryor
[build] .NET 6 P7 Support
b2dc8e9 
Context: 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
jonpryor added a commit to dotnet/java-interop that referenced this issue Aug 19, 2021
@jonpryor
[build] .NET 6 P7 Support (#869)
2eb9ff2 
Context: 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 #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
jonpryor added a commit to dotnet/java-interop that referenced this issue Aug 25, 2021
@jonpryor
[build] .NET 6 P7 Support (#869)
476bb5b 
Context: 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 #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
jpobst pushed a commit to dotnet/java-interop that referenced this issue Sep 30, 2021
@jonpryor @jpobst
[build] .NET 6 P7 Support (#869)
abc100e 
Context: 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 #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
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