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[NativeAOT-LLVM] Add a property to build Wasm core modules for library project types #3126

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[NativeAOT-LLVM] Add a property to build Wasm core modules for library project types #3126

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88f8189
Add WasmCoreModule to build Wasm core modules as opposed to components.
yowl Jul 5, 2025
f48887c
typos
yowl Jul 6, 2025
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10 changes: 10 additions & 0 deletions docs/using-nativeaot/compiling.md
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Expand Up @@ -115,6 +115,16 @@ Note that assemblies other than the one being published (e. g. those from refere

See also the [NativeLibrary sample](../../samples/NativeLibrary).

### WebAssembly Core Modules for WASI

NativeAOT-LLVM by default will produce Wasi component modules using the `wasm32-unknown-wasip2` triple. If you need to produce WebAssemblyCore modules from a library project, add
```xml
<PropertyGroup>
<WasmCoreModule>true</WasmCoreModule>
</PropertyGroup>
```
to your project file. This can be useful for uses that do not support WebAssembly components, e.g. extism.

## WebAssembly module imports

Functions in other WebAssembly modules can be imported and invoked using `DllImport` and `WasmImportLinkage` e.g.
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5 changes: 3 additions & 2 deletions src/coreclr/nativeaot/BuildIntegration/Microsoft.NETCore.Native.targets
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Expand Up @@ -125,7 +125,8 @@ The .NET Foundation licenses this file to you under the MIT license.
<WasmOptimizationSetting Condition="$(Optimize) == 'true' and $(OptimizationPreference) == 'Size'">-Oz</WasmOptimizationSetting>

<IlcLlvmTarget Condition="'$(_targetOS)' == 'browser'">wasm32-unknown-emscripten</IlcLlvmTarget>
<IlcLlvmTarget Condition="'$(_targetOS)' == 'wasi'">wasm32-unknown-wasip2</IlcLlvmTarget>
<IlcLlvmTarget Condition="'$(_targetOS)' == 'wasi' and '$(WasmCoreModule)' != 'true'">wasm32-unknown-wasip2</IlcLlvmTarget>
<IlcLlvmTarget Condition="'$(_targetOS)' == 'wasi' and '$(WasmCoreModule)' == 'true'">wasm32-unknown-wasi</IlcLlvmTarget>
<IlcWasmStackSize>1048576</IlcWasmStackSize> <!-- 1MB -->
<IlcWasmStackSize Condition="'$(EmccStackSize)' != ''">$(EmccStackSize)</IlcWasmStackSize>
<IlcWasmGlobalBase>1024</IlcWasmGlobalBase>
Expand Down Expand Up @@ -582,7 +583,7 @@ The .NET Foundation licenses this file to you under the MIT license.
<CustomLinkerArg Include="@(NativeObjects->'&quot;%(Identity)&quot;'->Replace(&quot;\&quot;, &quot;/&quot;))" />
<!-- The canary function should be last in the linked output. But adding it to Native[Library|Object] runs into https://github.com/dotnet/msbuild/issues/5937. -->
<CustomLinkerArg Include="&quot;$(IlcSdkPath.Replace('\', '/'))libStackTraceIpCanary.o&quot;" Condition="'$(_targetOS)' == 'browser'" />
<CustomLinkerArg Include="@(WasmComponentTypeWit->'%(FullPath)'->Replace('\', '/')->'-Wl,--component-type,&quot;%(Identity)&quot;')" />
<CustomLinkerArg Include="@(WasmComponentTypeWit->'%(FullPath)'->Replace('\', '/')->'-Wl,--component-type,&quot;%(Identity)&quot;')" Condition="'$(WasmCoreModule)' != 'true'"/>
<CustomLinkerArg Include="-o &quot;$(NativeBinary.Replace(&quot;\&quot;, &quot;/&quot;))&quot;" />
<CustomLinkerArg Condition="'$(NativeDebugSymbols)' == 'true'" Include="-g3" />
<CustomLinkerArg Condition="'$(NativeDebugSymbols)' != 'true'" Include="-Wl,--strip-all" />
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