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Add dedicated NativeAOT WASM build integration for WASI - #135955
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MichalStrehovsky wants to merge 1 commit into
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Use WASI SDK clang/llvm-ar and portable runtime archives to produce .wasm components. Keep WASM off Unix/ELF linker, linker-script, and symbol-stripping paths; retain embedded debug information. Default dehydration and managed stack traces off: their metadata formats encode relative function pointers, incompatible with WASM table indices. Keep WASI toolchain setup distinct from architecture selection and reject unsupported target OSes, shared libraries, and multi-module compilation. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: a6f3a617-acae-4f4f-95d3-20b2a0bac43c
MichalStrehovsky
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arch-wasm
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Tagging subscribers to this area: @agocke, @dotnet/ilc-contrib |
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Tagging subscribers to 'arch-wasm': @lewing, @pavelsavara |
This was referenced Oct 16, 2026
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Summary
Add a dedicated NativeAOT WASM linker backend, with initial WASI support.
Use WASI SDK Clang and llvm-ar, portable runtime archives, and the required native dependencies to produce
.wasmcomponents targetingwasm32-wasip2. Keep WASM off Unix/ELF linker, linker-script, and objcopy stripping paths.StripSymbolsis ignored on WASM, retaining embedded debug information.Default data dehydration and managed stack-trace metadata off for WASM: their relative-function-pointer formats do not fit WASM table-index function pointers. Explicitly reject those unsupported formats, shared libraries, multi-module compilation, and aggregate executables.
Architecture selection is separate from WASI toolchain configuration; this does not treat all WASM as WASI or add browser linking support.
WASI_SDK_PATHselects the SDK.Validation
On the combined local NativeAOT WASI bringup tree, including other unmerged enablement:
.\dotnet.cmd msbuild src\coreclr\nativeaot\BuildIntegration\BuildIntegration.proj /t:Build /p:Configuration=Checked /p:TargetOS=wasi /p:TargetArchitecture=wasm /nologo /v:minimalpassed..\src\tests\build.cmd nativeaot checked test nativeaot\SmokeTests\AttributeTrimming\AttributeTrimming.csproj wasm wasipassed after forced regeneration/relinking; Wasmtime execution returned 100.StripSymbols=true, and SDK Clang selects the component linker without an explicit-fuse-ld.This branch contains only this cherry-picked commit from
main; it was not built independently. Unix hosts and browser targets were not built or run.Note
This PR description was generated by GitHub Copilot.