NET9 - warnings on building Blazor Wasm project (WASM0060, WASM0062, WASM0001)

[konstantin-karpukhin]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

1>WasmApp.Common.targets(793,5): Message WASM0060 : Type System.Object is not blittable: Not a ValueType
1>WasmApp.Common.targets(793,5): Message WASM0062 : Type System.Runtime.InteropServices.HandleRef is not blittable: Field _wrapper is not blittable
1>WasmApp.Common.targets(793,5): Warning WASM0001 : Could not get pinvoke, or callbacks for method 'ExternalLibrary.ExternalClass::GetCharABCWidthsFloat' because 'System.NotSupportedException: Unsupported parameter type in method 'ExternalLibrary.ExternalClass.GetCharABCWidthsFloat'
at PInvokeCollector.g__CollectPInvokesForMethod|6_0(MethodInfo method, <>c__DisplayClass6_0&)
at PInvokeCollector.CollectPInvokes(List1 pinvokes, List1 callbacks, HashSet`1 signatures, Type type)'

Expected Behavior

No warnings (as it was in NET8)

Steps To Reproduce

https://github.com/konstantin-karpukhin/BlazorWASM0001

Exceptions (if any)

Project should be configured for NET9 with WasmEnableSIMD set to false

.NET Version

No response

Anything else?

No response

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Tagging subscribers to 'arch-wasm': @lewing
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[pavelsavara]

Related ? #112963

[lewing]

This warning is generated to indicate that the code will fail at runtime (and it will). The logic that is generating the warning could (and should) be improved to understand the SupportedOsPlatform attribute. For now I would suppress the warning.

[lewing]

Related ? #112963

Weakly related