Blazor WebAssembly: Firefox complains about deprecated exception handling instruction

[oakad]

Is there an existing issue for this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe the problem.

At some point, Firefox started to display the following deprecation warning for the Blazor wasm code:

The WebAssembly exception handling 'try' instruction is deprecated and should no longer be used. Please recompile to use the 'try_table' instruction instead.

I suppose, dotnet wasm compiler still emits "legacy" exception handling code.

Describe the solution you'd like

Don't expect to see any warnings from the browser.

Suppose, dotnet wasm compiler should be given an option to emit "new" exception handling code.

If such an option exists, it's really difficult to find.

Additional context

No response

[dotnet-policy-service]

Tagging subscribers to 'arch-wasm': @lewing
See info in area-owners.md if you want to be subscribed.

[SingleAccretion]

If such an option exists, it's really difficult to find.

Yes, there is no option for this right now. We could introduce one, but it would complicate the build, so another possibility is "just" waiting a few years until the new EH becomes widely available everywhere.

[oakad]

Compilers usually have so many target related options, that one more is hardly going to complicate things that much. :-)

[pavelsavara]

Fixed by #129851