feat(build): add cross-platform support and validation

[davehorner]

• docs(readme): switch to npm run build instead of node run build
• build: use npx for tsc, detect platform for math-lib flags and wasm compiler
• build: introduce getMathLibFlag(), getWasmCompiler() and getPackerOutput()
• build: validate existence of build/pack.h, throwing a clear error if missing
• build: update clang invocations for WASM to include correct include paths and output filenames

I believe we are down to c3 issues; too much for my recreational session today.

• construct PingMessage via struct initializer and call platform::send_message(&ping_msg)
• change other_players to var other_players: HashMap(uint, Player)
• streamline os::native_fwrite_fn lambda signature

Here’s a summary of what we did to get your build working:

1. Cross-Platform Build Fixes:

   • Updated your build.js to use npx for TypeScript compilation in a way that works on both Windows and Unix.
   • Patched the script so that the C packer binary is named packer.exe on Windows and packer elsewhere, and all references use the correct name.

2. Math Library Linking:

   • Fixed the build script to only add the -lm flag (math library) on non-Windows platforms, preventing linker errors on Windows.

3. Wasm Compilation on Windows:

   • Switched the wasm build commands to use emcc (Emscripten) on Windows, since standard clang does not support wasm32 out of the box.

4. Build Order and File Generation:

   • Ensured that pack.h is generated by running the packer before any compilation steps that require it.
   • Added a check to throw a clear error if pack.h is not generated.

5. C3 Source Code Fixes:

   • Fixed struct literal usage by assigning to a temporary variable before taking its address.
   • Removed or corrected invalid type aliasing for generics in C3.
   • Corrected function literal syntax for C3.
   • Cleaned up other C3 syntax issues as reported by the compiler.

I used the following:
Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser Invoke-RestMethod -Uri https://get.scoop.sh | Invoke-Expression1
scoop install c3

you need to install and do a emsdk_env before building. https://emscripten.org/docs/getting_started/downloads.html I installed via choco; I'm not sure I suggest it.

we're closer to a working build for windows.

[davehorner]

last_build_attempt_250610.txt
attached is the full log from where I stopped.