wasi-sdk

I would really love being able to take any POSIX command line tool, compile that to WASI, and run it on (at least) Linux, Windows and macOS like a regular executable without having to install a separate WASI runtime or any scare-popups showing up like on macOS. I'm a 'WASI convert' since I was able to take an ancient 8-bit assembler written in C89 in the mid-90's (http://xi6.com/projects/asmx/), compile that as-is with the WASI SDK (https://github.com/WebAssembly/wasi-sdk), and then integrate it into a VSCode extension (https://marketplace.visualstudio.com/items?itemName=floooh.v...). A similar problem I'd like to solve better is a shader cross-compiler (https://github.com/floooh/sokol-tools) which needs to run on Linux, macOS and Windows and takes too long to build locally, thus I currently need to distribute that as pre-built binaries.

There is the WASI SDK if you want to target WASI from C/C++: https://github.com/WebAssembly/wasi-sdk It comes with a libc implemented in WASM.

Just wrap the core functionality into a 'pure' WASM module which doesn't need to access 'system APIs', and then if needed write two thin wrappers, one for the 'web personality' and one for the 'WASI personality'. WASI has the advantage that many compilers support it directly, e.g. in Zig: > cat hello.zig const print = @import("std").debug.print; pub fn main() void { print("Hello World!\n", .{}); } > zig build-exe hello.zig -target wasm32-wasi > wasmtime hello.wasm Hello World! Or if you prefer C: > cat hello.c #include <stdio.h> int main() { printf("Hello World!\n"); } > zig cc hello.c -o hello.wasm -target wasm32-wasi > wasmtime hello.wasm Hello World! (I guess Rust can do the same, or for a purely clang-based solution see: https://github.com/WebAssembly/wasi-sdk)