WASI SDK

Health v2 · maintenance only

Adoption not part of the score

1628 stars · 236 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

WASI SDK is a WebAssembly C/C++ toolchain that bundles upstream Clang/LLVM with the wasi-libc sysroot, configured to target wasm32-wasi out of the box. It provides prebuilt SDK packages and CMake-based build scripts so developers can compile C and C++ code to WebAssembly that runs on WASI runtimes like Wasmtime.

Use cases

• compile c/c++ to webassembly
• build wasm binaries targeting wasi
• set up a clang toolchain with wasi-libc sysroot
• cross-compile native libraries to wasm32-wasi
• build portable sandboxed components from c++ code
• produce webassembly modules for wasmtime

When to choose

• you need to compile C or C++ source to WebAssembly with WASI system interfaces
• you want a prebuilt, ready-to-use Clang + sysroot instead of assembling one manually
• you're building portable plugins or serverless functions in C/C++ that run on WASI runtimes

When to avoid

• you're compiling Rust, Go, or other languages with their own WASI toolchains
• you only need to run WebAssembly, not compile to it
• you need browser-targeted WebAssembly without WASI APIs

Facets

library · maturity active

compiler build-tool developer-tools sdk compilers developer-tools cross-platform wasm windows cli wasi webassembly llvm clang wasi-libc sysroot cmake c-cpp-toolchain linux macos

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markdown · JSON · MCP: product_card(name="WebAssembly/wasi-sdk")