[Breaking change]: RuntimeInformation.OSArchitecture return value under emulation

[jkotas]

Description

RuntimeInformation.OSArchitecture returned incorrect value under emulation.

Version

.NET 7 Preview 6

Previous behavior

System.Runtime.InteropServices.RuntimeInformation.OSArchitecture returned Architecture.x64 in emulated processes on Windows Arm 64-bit and macOS Apple Silicon systems.

New behavior

System.Runtime.InteropServices.RuntimeInformation.OSArchitecture returns Architecture.Arm64 in emulated processes on Windows Arm 64-bit and macOS Apple Silicon systems.

Type of breaking change

• Binary incompatible: Existing binaries may encounter a breaking change in behavior, such as failure to load/execute or different run-time behavior.
• Source incompatible: Source code may encounter a breaking change in behavior when targeting the new runtime/component/SDK, such as compile errors or different run-time behavior.

Reason for change

The previous behavior was incorrect.

Recommended action

Code that expects the process architecture should be changed to call System.Runtime.InteropServices.RuntimeInformation.ProcessArchitecture instead.

Feature area

Interop

Affected APIs

System.Runtime.InteropServices.RuntimeInformation.OSArchitecture

[hamarb123]

@jkotas, I know this is the wrong issue, but I just wanted to say that dotnet/runtime#52639 doesn't have a breaking change doc made or in the making afaik, but it is supposed to have one.

[jkotas]

dotnet/runtime#52639 doesn't have a breaking change doc made or in the making afaik, but it is supposed to have one.

It has needs-breaking-change-doc-created label. Area owners are expected to go over all PRs marked with this label and make sure that the breaking change docs are created.

@danmoseley Is there a dead-line for creating the breaking change docs?

[danmoseley]

I think @jeffhandley will ask someone to chase them up for the release in a little bit, like last year.