The compiler does not ship with ARM versions of Microsoft.DiaSymReader.Native and thus does not support Windows PDBs on ARM.

Either

1. include ARM binaries to support .NET Framework targeting projects and update SymUnmanagedWriterFactory.CreateWriter to load them.
2. Report better error in SymUnmanagedWriterFactory.CreateWriter when running on ARM. Current error:
   error CS0041: Unexpected error writing debug information -- 'An attempt was made to load a program with an incorrect format. (0x8007000B)'
   See pdbonly fails on Arm64 sdk#23838.

I think we need [1] so that we can build legacy projects targeting .NET Framework ARM64.

In addition, we should consider reporting warning from our msbuild targets when DebugType is set to Full or PdbOnly in .NET 7+ project. The warning would recommend using Portable PDBs.

Once we implement and run all tests we should also mark DSRN package "release".

Tasks list

• DSRN package that has the .arm64 extensions
• symreader version that supports ARM64. This is used by Pdb2Xml in unit tests.
  • Move to netstandard2.0 symreader#261
  • ARM64 support symreader#262
• Compiler support for loading the .arm64 DSRN libraries
  • Get the initial work with ARM64 binaries published (Initial .NET Framework ARM64 support #60735)
  • Get a CI leg up that validates our tests under .NET Framework ARM64
  • Move back to a single build where we produce both AnyCPU and ARM64 binaries