Show HN: How to compile C/C++ for WASM, pure Clang, no libs, no framework

• howto-wasm-minimal

  8 515 3.0 C++

  How to create minimal wasm module with plain C/C++

  For future readers, this is the code that is being referred:

  https://github.com/ern0/howto-wasm-minimal/blob/master/inc.c...

  It should be:

     uint32_t gray = 0.299 * ptr[i] + 0.587 * ptr[i+1] + 0.114 * ptr[i+2];

• SaaSHub

  www.saashub.com featured

  SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

  

• v86

  161 19,889 9.4 JavaScript

  x86 PC emulator and x86-to-wasm JIT, running in the browser

  I'm investigating v86 [1] to get a c compiler in the browser. There's an example with a 5.5 mb Build Root Linux example [2] where you can pass files and commands between the browser and vm with a Lua compiler. The vm boots within a few seconds in Firefox on my Pixel 2 XL. There's also an example where Lua code is passed from the host, but you have to download the GitHub repo to see it [3]

  [1] https://github.com/copy/v86

• cib

  6 839 0.0 C++

  clang running in browser (wasm)

  That is half of what I would need for a project, the other half being Clang itself running in the browser (to use for teaching), in theory there is [1] since many years, but in practice it never worked for me (even now I get "Runtime error: memory access out of bounds")

  [1] https://tbfleming.github.io/cib/

• wefx

  4 30 4.9 C

  Basic WASM graphics package to draw to an HTML Canvas using C. In the style of the gfx library

  Not trying to steal your thunder, but here is another nostdlib clang -> wasm example with malloc, a few math functions, rand, and writing to a canvas doing animation.

  => https://github.com/robrohan/wefx

• wasm-fizzbuzz

  6 1,506 0.0 C++

  WebAssembly from Scratch: From FizzBuzz to DooM.

  These are also good resources on using wasm without dependencies:

  https://depth-first.com/articles/2019/10/16/compiling-c-to-w...

  https://github.com/diekmann/wasm-fizzbuzz

• clang-wasm

  2 143 0.0 C++

  How to build webassembly files with nothing other than standard Clang/llvm.

  See also my example I put together some time ago: https://github.com/PetterS/clang-wasm

  At the time, I could not find something like this online.

• chip8-book

  5 203 3.9 Rust

  An introduction to Chip-8 emulation using Rust

  I made some emulators in Rust as a learning project during the start of the pandemic, and ran into the exact same issue when I wanted to make a wasm version to run in a browser. Eventually, I was able to figure out how to do it, although I do use the 'wasm-pack' Cargo package to assist with it (I think you can get away without it if you're really motivated, you just need to set up the targets and other elements yourself). Basically you define some Rust API to expose whatever you need from your project, then that and the project get compiled into one .wasm binary and some (surprisingly readable) JavaScript "glue" gets generated which allows for easy inclusion into a web page. It works well for code in the std, but I've had issues with 3rd party packages.

  It's focused on emulation development, but I wrote a document that describes the process I followed: https://github.com/aquova/chip8-book/blob/master/src/wasm.md

• matrix-algebra

  1 0 0.0 JavaScript

  Some simple Matrix Algebra in WebAssembly

• llvm-project

  1 21 10.0 C++

  This is the canonical git mirror of the LLVM subversion repository. The repository does not accept github pull requests at this moment. Please submit your patches at http://reviews.llvm.org. (by binji)

  This was a topic at CppCon'19 (seems like exactly the same use case as you are describing: teaching!). Take a look at https://www.youtube.com/watch?v=5N4b-rU-OAA. I think it relies on the LLVM fork, so not sure how well it'll work for you, quick web search points to: https://github.com/binji/llvm-project.

• wajic

  6 193 0.0 JavaScript

  WebAssembly JavaScript Interface Creator

  Since I haven't seen it mentioned in the comments yet, here's another interesting project in the general area of "WASM without Emscripten":

  https://github.com/schellingb/wajic

  This provides an alternative implementation of Emscripten's EM_JS() magic (embed Javascript snippets right in the C/C++ source code), but without the Emscripten SDK. It still needs some additional tools next to Clang, so it sits somewhere between "pure Clang" and "full Emscripten SDK".

• KolorWheel.js

  3 39 0.0 JavaScript

  🌈 Color palette generator JavaScript library

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