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Even outside of C/C++, Emscripten seems to be required in some fashion for just about every "compile X to webasm". Which i'm not that happy about as it's quite

Even outside of C/C++, Emscripten seems to be required in some fashion for just about every "compile X to webasm". Which i'm not that happy about as it's quite heavy and takes a long time to compile, which makes it harder for newcomers to try it out because it requires a fairly large time investment to even compile hello world.

bbatha 9y ago
Rust’s wasm32-unknown-unknown target does not use emscripten at all. The tool cargo-web will handle the js module shims for you.
- Game_Ender 9y ago
  cargo-web uses emscripten under the hood.
  - a_humean 9y ago
    No, he is right. cargo-web supports three backends, of which only two include emscripten and the third using a native rust backend. https://github.com/koute/cargo-web#features https://github.com/koute/cargo-web#features Rust can be compiled to wasm without emscripten using wasm32-unknown-unknown.
    - bringtheaction 9y ago
      Does that mean I can install cargo-web without emscripten or do I still need it even though I am not going to use it just because the two other targets use it? In other words, is emscripten an optional or a hard dependency?
      - a_humean 9y ago
        Its an optional dependency. You can build without it by just using a nightly version of rust with the wasm32-unknown-unknown backend. An example of using cargo-web with the stdweb rust project: https://github.com/koute/stdweb#running-the-examples https://github.com/koute/stdweb#running-the-examples
ekidd 9y ago
> Even outside of C/C++, Emscripten seems to be required in some fashion for just about every "compile X to webasm". One exception to this is Rust's new "wasm32-unknown-unknown" target, which uses LLVM to directly generate wasm files without going through emscripten: https://www.hellorust.com/news/native-wasm-target.html https://www.hellorust.com/news/native-wasm-target.html The easiest way to use it for larger projects is probably via https://github.com/koute/cargo-web https://github.com/koute/cargo-web, which handles a lot of packaging very nicely. It's really nice to use, assuming you already know Rust.
- Klathmon 9y ago
  Yeah I'm super excited about Rust's new webasm compiler, as well as some new-ish stuff with .Net that works without Emscripten. I get the ecosystem is super young, but it was honestly what kept me from playing with Webasm for a while, because each time I'd sit down to play with it I'd be in for a 3 hour compile after spending an hour getting my windows machine to have the right compilers and not stomping over other things I have setup on here.
  - azakai 9y ago
    Sounds like you were seeing an old emscripten SDK bug, where it compiled LLVM+clang unnecessarily and with debug info (which is very slow). Currently there shouldn't be anything like that, it will download a binary build of LLVM+clang for your system. It should be ready to use immediately after that download.

bbatha 9y ago

Rust’s wasm32-unknown-unknown target does not use emscripten at all. The tool cargo-web will handle the js module shims for you.

Game_Ender 9y ago
cargo-web uses emscripten under the hood.
- a_humean 9y ago
  No, he is right. cargo-web supports three backends, of which only two include emscripten and the third using a native rust backend. https://github.com/koute/cargo-web#features https://github.com/koute/cargo-web#features Rust can be compiled to wasm without emscripten using wasm32-unknown-unknown.
  - bringtheaction 9y ago
    Does that mean I can install cargo-web without emscripten or do I still need it even though I am not going to use it just because the two other targets use it? In other words, is emscripten an optional or a hard dependency?
    - a_humean 9y ago
      Its an optional dependency. You can build without it by just using a nightly version of rust with the wasm32-unknown-unknown backend. An example of using cargo-web with the stdweb rust project: https://github.com/koute/stdweb#running-the-examples https://github.com/koute/stdweb#running-the-examples

ekidd 9y ago

> Even outside of C/C++, Emscripten seems to be required in some fashion for just about every "compile X to webasm". One exception to this is Rust's new "wasm32-unknown-unknown" target, which uses LLVM to directly generate wasm files without going through emscripten: https://www.hellorust.com/news/native-wasm-target.html https://www.hellorust.com/news/native-wasm-target.html The easiest way to use it for larger projects is probably via https://github.com/koute/cargo-web https://github.com/koute/cargo-web, which handles a lot of packaging very nicely. It's really nice to use, assuming you already know Rust.

Klathmon 9y ago
Yeah I'm super excited about Rust's new webasm compiler, as well as some new-ish stuff with .Net that works without Emscripten. I get the ecosystem is super young, but it was honestly what kept me from playing with Webasm for a while, because each time I'd sit down to play with it I'd be in for a 3 hour compile after spending an hour getting my windows machine to have the right compilers and not stomping over other things I have setup on here.
- azakai 9y ago
  Sounds like you were seeing an old emscripten SDK bug, where it compiled LLVM+clang unnecessarily and with debug info (which is very slow). Currently there shouldn't be anything like that, it will download a binary build of LLVM+clang for your system. It should be ready to use immediately after that download.