Latest ILLink.Task is failing for osx-x64 Runtime Identifier

[sidravi]

When I do dotnet publish -c release -r osx-x64 after adding ILLink.Tasks nuget package version 0.1.5-preview-1841731, it fails with the following error:
C:\Program Files\dotnet\sdk\2.1.500\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.CrossGen.targets(72,5): error NETSDK1016: Unable to find resolved path for '...\.nuget\packages\runtime.osx-x64.microsoft.netcore.app\2.1.6\runtimes\osx-x64\native\..\..\..\tools\crossgen.exe'. [....csproj]

Looks like its searching for crossgen.exe for Mac version, instead of crossgen.

I tried using older versions (0.14 preview) and it failed with error The "GetRuntimeLibraries" task failed unexpectedly. I believe this is the same issue discussed in #308 which I think is resolved in later versions.

@sbomer

[GTANAdam]

win-x64 and linux-x64 are affected as well, it seems that ILLink.Task (0.1.5-preview-1841731) is not compatible with netcoreapp2.2.

Error when publishing to 'linux-x64':

error NETSDK1016: Unable to find resolved path for 'coreclr'.

while publishing to 'win-x64':

Fatal error in IL Linker
Mono.Linker.Steps.XmlResolutionException: Failed to process XML description: ---> System.NullReferenceException: Object reference not set to an instance of an object.
at Mono.Linker.LinkContext.ResolveReferences(AssemblyDefinition assembly)
at Mono.Linker.Steps.ResolveFromXmlStep.ProcessReferences(AssemblyDefinition assembly, LinkContext context)
at Mono.Linker.Steps.ResolveFromXmlStep.GetAssembly(LinkContext context, AssemblyNameReference assemblyName)
at Mono.Linker.Steps.ResolveFromXmlStep.ProcessAssemblies(LinkContext context, XPathNodeIterator iterator)
at Mono.Linker.Steps.ResolveFromXmlStep.Process()
--- End of inner exception stack trace ---
at Mono.Linker.Steps.ResolveFromXmlStep.Process()
at Mono.Linker.Steps.BaseStep.Process(LinkContext context)
at Mono.Linker.Pipeline.Process(LinkContext context)
at Mono.Linker.Driver.Run(ILogger customLogger)
at Mono.Linker.Driver.Execute(String[] args, ILogger customLogger)`

[marek-safar]

Duplicate of #286