Hey y’all. :wave: … new to Crystal but heard about the merge of WASM/WASI support and wanted to take it for a spin. I compiled from master and attempted a hello world… fun _start() puts "Hello World" end Build works fine: ⚡ ~/src/crystal/bin/crystal build hello_world.cr --cross-compile --targe…

Crystal supports targeting WASM, but doesn’t include any of the necessary libs for linking yet. You will need libc, librt and libpcre at least. Grab the libc sysroot from here: https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-14/wasi-sysroot-14.0.tar.gz Grab the compiler_rt from …

That thread seems a bit dated given this PR was merged. :slight_smile: Hello WebAssembly! (MVP implementation) crystal-lang:master ← lbguilherme:feat/webassembly opened 07:28PM - 01 Jul 21 UTC (UTC) …

@lbguilherme Sorry for the tag but maybe you can provide some guidance here? Amazing work btw!

Don’t worry, this will definitely get simpler in the future.

⚡ wasmtime hello-final.wasm Hello World :raised_hands: :raised_hands: :raised_hands: Got it working! Thanks!!

FYI you can optimize the binary size significantly by using wasm-opt: mkdir -p build ~/src/crystal/bin/crystal build src/main.cr --cross-compile --target wasm32-unknown-wasi -o build/unlinked wasm-ld build/unlinked.wasm wasm32-wasi/crt1.o -o build/linked.wasm -L wasm32-wasi -lc -lpcre -lclang_rt.bu…

Great! You can try adding --strip-all --compress-relocations to wasm-ld and --converge to wasm-opt, and --release to crystal build to shave a few bytes.

I got this error: $ git clone https://github.com/lbguilherme/crystal.git && cd crystal && make && cd .. $ crystal/.build/crystal build hello.cr --cross-compile --target wasm32-unknown-wasi Error: Unsupported architecture for target triple: wasm32-unknown-wasi $ crystal/.build/crystal build hello.…

Hi @orangeSi ! Clone from https://github.com/crystal-lang/crystal.git , the feature is already merged upstream.

@orangeSi Try using crystal/bin/crystal and not crystal/.build/crystal.

Trying out WASM Support

Help & Support

orangeSi March 24, 2022, 2:06am 2

Just if you had not read Crystal in (possible) WASM everywhere future? - #20 by maxfierke

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Trying out WASM Support

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