Using Go and append() make the cartridge fail at runtime

[matm]

Adding this code snippet into the main.go just after a w4 init

var s = []int{1}

//go:export start
func start() {
        s = append(s, 2)
}

compiles fine but fails at runtime with the blue screen error

The cartridge has tried to import a missing function. See console for more details.

Unfortunately there is nothing in the console.

We recently merged this target.json for games written in Go, maybe we're missing something there, I don't know:

{
    "llvm-target": "wasm32-unknown-unknown",
    "cpu": "generic",
    "features": "+mutable-globals,+nontrapping-fptoint,+sign-ext,+bulk-memory",
    "build-tags": [
        "tinygo.wasm",
        "wasm_unknown"
    ],
    "goos": "linux",
    "goarch": "arm",
    "linker": "wasm-ld",
    "rtlib": "compiler-rt",
    "scheduler": "none",
    "cflags": [
        "-mno-bulk-memory",
        "-mnontrapping-fptoint",
        "-msign-ext"
    ],
    "ldflags": [
        "--allow-undefined",
        "--no-demangle",
        "--import-memory",
        "--initial-memory=65536",
        "--max-memory=65536",
        "--stack-first",
        "--no-entry",
        "-zstack-size=14752"
    ]
}

So for now, append() can't be used at all, which is very annoying :(

Using

$ tinygo version
tinygo version 0.34.0 linux/amd64 (using go version go1.23.3 and LLVM version 18.1.2)

[matm]

That means the current snake tutorial in Go fails at runtime.

[matm]

Okay, I think the current settings in target.json lead to missing features. I mean, some function calls don't work, append() can't be used without having a blue screen of the death. Same for the rand package which can be imported by raises runtime errors.

The current setup has to be wrong. I don't know tinygo much, maybe some of you can help guys? There is no way to make the current Snake tutorial work at all with these target.json parameters.

[raytracer]

I have the same problem. I have taken a hint from the previous thread #595 (comment) about this issue and added the following Code to the wasm4.go file:

//go:linkname getCurrentStackPointer tinygo_getCurrentStackPointer
func getCurrentStackPointer() uintptr {
	return 0
}

Of course fixing the target.json would be a better solution.