"zig-0.11.0" branch, build.zig "unsupported arch" error with Zig 0.11.0-dev.3381+9ee0a706d.

[jwstolk]

The wasm32 target in the "zig-0.11.0" branch fails with my Zig version: 0.11.0-dev.3381+9ee0a706d.
This is the version currently installed by "snap install zig --classic --edge" on Ubuntu 22.04.2 LTS.

I made some small changes since .install() and .dependOn() properties seem to have changed in my Zig.
( build.zig diff: https://pastebin.com/dCgzXZiM )
The local Linux binary builds and runs, after installing the required C libraries.

The -Drelease-small option is not supported by my Zig 0.11 so I left it out, running:

zig build -Dtarget=wasm32-emscripten --sysroot emsdk/upstream/emscripten/cache/sysroot

I get the "unsupported arch" error, also mentioned here: ziglang/zig#10836
That issue indicates that the problem can be reproduced by removing "wasm32_freestanding_target.os_tag = .freestanding;" line, however, the https://github.com/floooh/pacman.zig/blob/zig-0.11.0/build.zig file does have that line, and still reproduces the error.

The instructions and comments in build.zig indicate that some hacks are required. I did not take any additional manual steps and assumed that the hacks are implemented in the build.zig.

It is very possible that I made mistakes in my changes of build.zig. If not, the used Zig version may be the cause. (or maybe snaps installs a version that is already too old)

[susoferreira]

i found the error, libgame is being built with the default target instead of wasm32-freestanding,it has to be .target = wasm32_freestanding_target inside libgame

[floooh]

Btw, the wasm32-freestanding 'hack' for the Zig code was needed because the Zig stdlib didn't compile with wasm32-emscripten at the time I fixed build.zig for Emscripten, but at the same time I couldn't compile the C parts with wasm32-freestanding because the sokol headers rely on 'Emscripten magic' that's only present in the wasm32-emscripten target.

[floooh]

Note, the sokol-zig bindings just had a big update for the latest zig dev version changes (https://github.com/floooh/sokol-zig/tree/zig-0.11.0), but I didn't get around yet updating the pacman.zig and kc85.zig projects yet (it's not just Zig updates, but also breaking changes in the sokol headers and bindings).

Not sure yet when I get around fixing the zig-0.11.0 branches in those 'side projects' yet. I'll keep this ticket open until then.

[floooh]

Just FYI, I just ran into the same problem when updating pacman.zig for a recent zig 0.11.0-dev version and the latest sokol headers (and merged this to master now).

I didn't look into the problem, just added a note to the readme that the wasm build seems to be broken atm.

[floooh]

@jwstolk I found a workaround which I will commit shortly (basically, zig build needs to be called with -Dtarget=wasm32-freestanding. Looks to me like a regression in Zig with the wasm32-emscripten target (building libraries with the wasm32-emscripten target works fine, but not whole programs). It might be that the unsupported arch error is intended though, because there's a pub fn main() in the Zig code.

[floooh]

PS: closing this ticket, because the WASM build instructions in the readme should now work again.

[jwstolk]

Thanks, the instructions also work for me, even with the latest Zig 0.12.0-dev.105+f1992a39s (In Ubuntu) and the compiler output works great in my browser.