[Bug]: Windows build does not work with latest version of Visual Studio

[marcnause]

Please check the following before submitting a new issue.

• I have searched the existing issues.
• I have carefully read the documentation and verified I have added the required platform specific configuration.

Please select affected platform(s)

• Android
• iOS
• Windows

Steps to reproduce

1. Use flutter-permission-handler in a Flutter app
2. Use latest version of Visual Studio (18.6.1)
3. Try to compile the app for Windows

Expected results

The app compiles and works fine.

Actual results

Compilation fails with the following error:

C:\Program Files\Microsoft Visual Studio\18\Community\VC\Tools\MSVC\14.51.36231\include\experimental\coroutine(37,1): error C2338: static assertion failed: 'error STL1011: The /await compiler option, <experimental/coroutine>, <experimental/generator>, and <experimental/resumable> are deprecated by Microsoft and will be REMOVED SOON. They are superseded by the C++20 <coroutine> and C++23 <generator> headers. You can define _SILENCE_EXPERIMENTAL_COROUTINE_DEPRECATION_WARNINGS to suppress this error for now.' [C:\Users\marcn\pslab-app\build\windows\x64\plugins\permission_handler_windows\permission_handler_windows_plugin.vcxproj]

Code sample

Screenshots or video

Screenshot

Version

permission_handler 12.0.1

Flutter Doctor output

Doctor output

Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 3.44.0, on Microsoft Windows [Version 10.0.26200.8328], locale de-DE)
[√] Windows Version (Windows 11 or higher, 25H2, 2009)
[X] Android toolchain - develop for Android devices
    X Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/to/windows-android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, please use
      `flutter config --android-sdk` to update to that location.

[X] Chrome - develop for the web (Cannot find Chrome executable at "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe")
    ! "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" is not executable.
[√] Visual Studio - develop Windows apps (Visual Studio Community 2026 18.6.1)
[√] Connected device (2 available)
[√] Network resources

! Doctor found issues in 2 categories.

[marcnause]

Removing the following line from permission_handler_windows/windows/CMakeLists.txt made it work for me:

target_compile_options(${PLUGIN_NAME} PRIVATE /await)

[kjxbyz]

Same issue.

C:\Program Files\Microsoft Visual Studio\18\Enterprise\VC\Tools\MSVC\14.51.36231\include\experimental\coroutine(37,1): error C2338: static assertion failed: 'error STL1011: The /await compiler option, <experimental/coroutine>, <experimental/generator>, and <experimental/resumable> are deprecated by Microsoft and will be REMOVED SOON. They are superseded by the C++20 <coroutine> and C++23 <generator> headers. You can define _SILENCE_EXPERIMENTAL_COROUTINE_DEPRECATION_WARNINGS to suppress this error for now.' [D:\a\picguard\picguard\build\windows\x64\plugins\permission_handler_windows\permission_handler_windows_plugin.vcxproj]
D:\a\picguard\picguard\build\windows\x64\_deps\sentry-native-src\external\breakpad\src\common\md5.cc(74,23): warning C4267: '+=': conversion from 'size_t' to 'google_breakpad::u32', possible loss of data [D:\a\picguard\picguard\build\windows\x64\_deps\sentry-native-build\external\breakpad_client.vcxproj]