"bad magic number" from wasm blob built with Go

[maddyblue]

I have a small go file:

package w

func sum(x, y int) int {
	return x + y
}

I build it to a wasm blob:

GOOS=js GOARCH=wasm go build -o web.wasm w/w.go

But when running wasmer.NewInstance on it, I get:

Failed to instantiate the module:
    compile error: Validation error "Bad magic number"

Does go not build compatible wasm blobs?

[Hywan]

wasm2wat tells me the same. The resulting web.wasm file contains this:

!<arch>
__.PKGDEF       0           0     0     644     118       `
go object js wasm go1.12.8 X:framepointer
build id "f4e5LZ0A-5ohVijh4Sns/xwk6yYDmaERJ6X8P8yL1"


$$B
i

[Hywan]

I'm not sure Go can generate a WebAssembly module from a library only, it seems to work for a binary only.

I'm closing the issue since it's not related to this project, but feel free to re-open at any moment :-)!

[waynr]

For future explorers of the Wasm frontiers, I have gotten past this problem by compiling to wasm with tinygo

[Hywan]

Yup, tinygo seems a nice solution for this kind of usage.