Intellisense on Linux with clang++ and -fms-extensions defines _WIN32

Environment

• OS and Version: Windows 11 22000.1455
• VS Code Version: 1.74.3
• C/C++ Extension Version: v1.14.0
• If using SSH remote, specify OS of remote machine: Debian 11

Bug Summary and Steps to Reproduce

Bug Summary:

Intellisense on Linux with clang++ and -fms-extensions defines _WIN32 that lead to incorrect output.

Steps to reproduce:

1. Create simple CMake C++ project on wsl (or clear Debian 11)
2. Set compiler clang++-15
3. Add compiler flag -fms-extensions with target_compile_options
4. Intellisense defines _WIN32

Expected behavior:

No _WIN32 on linux

Configuration and Logs

{
  "configurations": [
    {
      "name": "Linux",
      "includePath": [
        "${workspaceFolder}/**"
      ],
      "defines": [],
      "compilerPath": "/usr/bin/clang++-15",
      "cStandard": "c17",
      "cppStandard": "c++20",
      "intelliSenseMode": "linux-clang-x64",
      "configurationProvider": "ms-vscode.cmake-tools"
    }
  ],
  "version": 4
}

Other Extensions

CMake Tools v1.12.27
CMake v0.0.17

Additional context

No response

Reproduce the issue in the reported CMake project on Debian or WSL using clang++-15, -fms-extensions, and the shown IntelliSense configuration. Compare the compiler-defined macros with IntelliSense's results; done means _WIN32 is not defined for this Linux configuration while the flag remains enabled.