Update llvm-objdump for Webassembly

[afonso360]

👋 Hey,

The Webassembly language was recently added (in #6429). I tested it today on the live enviornment, and it appears to not be working (example: https://godbolt.org/z/YP5KdscEM).

I don't really know how to debug this, there is no other output other than objdump returned 255 which doesn't tell me a whole lot. (If someone can help me investigate this it would be appreciated)

Looking at the configs for the other languages, they always specify a objdump binary in the /opt path, so maybe llvm-objdump is not available in the system?

This PR attempts to fix it by changing to a fixed version of llvm-objdump in the /opt install path. (I've also double checked, and that version does work locally)

[mattgodbolt]

Apologies I merged and did not test your change last night!

[mattgodbolt]

I think you're probasblby right here! thank you

[mattgodbolt]

this is rolling out now. seems to work better; the "execute" the app doesn't work for reasons I can't dig in to right now, but compiling to binary worked

[afonso360]

Neat! I haven't really tested the "Execute the code" functionality if that's what you're referring to.

But I wouldn't be surprised if it doesn't work, the binary that wasmtime builds is an ELF file, but that's just a detail, it's not supposed to be a standalone executable, it has to be invoked with wasmtime.

I'll try to figure out how to work that in at some point.

[afonso360]

Unfortunately this seems to have not fixed the issue on the live site 😞 . @mattgodbolt Is there any way I can debug these failures? I can't reproduce them locally.

[mattgodbolt]

Super odd; I don't know why this isn't working, I swear it worked when I tested it before!

[mattgodbolt]

From our logs it's like we haven't deployed this version somehow, I see:

Error executing objdump llvm-objdump {"code":255,"execTime":"59","okToCache":true,"stderr":"[F][2024-06-12T19:30:00+0000][1] runChild():487 Launching child process failed\n","stdout":"","timedOut":false,"truncated":false} 

which looks like it's still executing just raw llvm-objdump. I'll have to check some other stuff :|

[mattgodbolt]

Oh shucks: I think I deployed the wrong version

[mattgodbolt]

deploying now for real...will be ~30m

[afonso360]

Nice, thanks for looking into this! ❤️ (Edit: Seems to work now! 🎉 )