Unable to build Avalonia on Linux (Debian)

Hi,

following the guide at https://github.com/AvaloniaUI/Avalonia/blob/master/Documentation/build.md , I encounter the following error when performing the “dotnet restore” step on my Debian Buster system:

A compatible installed .NET Core SDK for global.json version [3.1.101] from [/home/tcrass/src/avalonia/global.json] was not found
Install the [3.1.101] .NET Core SDK or update [/home/tcrass/src/avalonia/global.json] with an installed .NET Core SDK:
  3.1.300 [/usr/share/dotnet/sdk]

There seems to be a dotnet version mismatch: The dotnet core version currently installable from https://docs.microsoft.com/en-us/dotnet/core/install/linux-package-manager-debian10 say:

$ dotnet --version
3.1.300

Is there a way to specify the required dotnet version in global.json in a minor-minor-version agnostic way?

Anyway, after manually editing global.json to match the installed dotnet version, I can restore the project. However, when issuing “dotnet run”, the build process throws an error (after printing zillions of warnings):

/path/to/home/.nuget/packages/sharpgentools.sdk/1.2.1/build/SharpGenTools.Sdk.targets(173,5): error MSB4018: Unerwarteter Fehler bei der GenerateExtensionHeaders-Aufgabe. [/home/tcrass  /path/to/avalonia/working-copy/src/Avalonia.Native/Avalonia.Native.csproj]                
/path/to/home/.nuget/packages/sharpgentools.sdk/1.2.1/build/SharpGenTools.Sdk.targets(173,5): error MSB4018: System.MissingMethodException: Method not found: 'Void System.Xml.Serialization.XmlSerializer.Serialize(System.Xml.XmlWriter, System.Object, System.Xml.Serialization.XmlSerializerNamespaces)'. [/path/to/home/path/to/avalonia/working-copy/src/Avalonia.Native/Avalonia.Native.csproj]             
/path/to/home/.nuget/packages/sharpgentools.sdk/1.2.1/build/SharpGenTools.Sdk.targets(173,5): error MSB4018:    at SharpGen.CppModel.CppModule.Write(Stream output) [/path/to/home/path/to/avalonia/working-copy/src/Avalonia.Native/Avalonia.Native.csproj]                       
/path/to/home/.nuget/packages/sharpgentools.sdk/1.2.1/build/SharpGenTools.Sdk.targets(173,5): error MSB4018:    at SharpGen.CppModel.CppModule.Write(String file) [/path/to/home/path/to/avalonia/working-copy/src/Avalonia.Native/Avalonia.Native.csproj]                         
/path/to/home/.nuget/packages/sharpgentools.sdk/1.2.1/build/SharpGenTools.Sdk.targets(173,5): error MSB4018:    at SharpGenTools.Sdk.Tasks.GenerateExtensionHeaders.Execute(ConfigFile config) [/path/to/home/path/to/avalonia/working-copy/src/Avalonia.Native/Avalonia.Native.csproj]                                                                                                                            
/path/to/home/.nuget/packages/sharpgentools.sdk/1.2.1/build/SharpGenTools.Sdk.targets(173,5): error MSB4018:    at SharpGenTools.Sdk.Tasks.SharpGenTaskBase.Execute() [/path/to/home/path/to/avalonia/working-copy/src/Avalonia.Native/Avalonia.Native.csproj]                     
/path/to/home/.nuget/packages/sharpgentools.sdk/1.2.1/build/SharpGenTools.Sdk.targets(173,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute() [/path/to/home/path/to/avalonia/working-copy/src/Avalonia.Native/Avalonia.Native.csproj]                                                                                                         
/path/to/home/.nuget/packages/sharpgentools.sdk/1.2.1/build/SharpGenTools.Sdk.targets(173,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(ITaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask) [/path/to/home/path/to/avalonia/working-copy/src/Avalonia.Native/Avalonia.Native.csproj]                                                                                                                     

I reckon this is either a bug or the documentation is outdated?

Cheers –

Torsten

[tcrass]

@tcrass delete obj/Debug/netstandard2.0/SharpGen, you probably have stale files.

Yepp, you were right – cleaning up did help, I can now successfuly build Avalonia! 😃

Still doesn’t work with the latest dotnet core version, though – so the documentation is still misleading.

Cheers –

Torsten

[xiangzhai]

Hi @kekekeks

Our OSX builds use https://github.com/CastXML/CastXML/archive/v0.2.0.tar.gz

Thanks for your suggestion!

CastXML-v0.2.0 works:

$ castxml --version
castxml version 0.2.0

CastXML project maintained and supported by Kitware (kitware.com).

Loongson clang version 3.9.0 (tags/RELEASE_390/final) (based on LLVM 3.9.0)
Target: mips64el-redhat-linux
Thread model: posix
InstalledDir: 

Thanks, Leslie Zhai