Use case

Once Windows ARM is supported (#53120), there will be two supported Windows platforms (windows-x64 and windows-arm64). When making an FFI plugin that uses a unique build process (e.g. Rust), it is necessary to know the target platform to include architecture-specific dynamic libraries (.so/.dll).

Proposal

Add the FLUTTER_TARGET_PLATFORM variable to Windows CMake (just like Linux's right now). Even if it is just a placeholder for windows-x64 for now, it will make migration to Windows ARM easier in the future. For reference, here are the two possible values for FLUTTER_TARGET_PLATFORM on linux right now (afaik):

• linux-arm64
• linux-x64

(Which appear to map pretty closely to the Dart ABIs.)