wasm-ld: error: couldn't allocate output register for constraint '{r0}'

[anshuman-mor]

Getting this error intermittently when compiling to wasip2

tinygo build -o test-tinygo-wasi2.wasm --target wasip2 --no-debug

wasm-ld: error: couldn't allocate output register for constraint '{r0}'

I am running this on Windows.

tinygo version
tinygo version 0.38.0 windows/amd64 (using go version go1.23.2 and LLVM version 19.1.2)

[deadprogram]

Hello @anshuman-mor could you please provide some code that reproduces this error? Thank you.

[joelnpdr]

Hello, I have the same issue. I am compiling this library, which has some crypto operations:

https://github.com/gagliardetto/solana-go

I am using the same version as @anshuman-mor

package main

import sgo "github.com/gagliardetto/solana-go"

func main() {
        _, err := sgo.NewRandomPrivateKey()
        if err != nil {
                panic(err)
        }
        time.Sleep(50 * time.Second)
}

I am trying to generate a ed25519 key pair.

[joelnpdr]

I see that for wasip2, tinygo pulls in ARM code:

https://github.com/tinygo-org/tinygo/blob/release/targets/wasip2.json#L8

[aykevl]

Oh, huh. Somehow this program is calling syscalls, which of course won't work on wasip2. I wonder how that happened.

[aykevl]

I traced the calls a little bit:

• github.com/streamingfast/logging.maybeNewLogger
• golang.org/x/crypto/ssh/terminal.IsTerminal
• golang.org/x/term.IsTerminal
• golang.org/x/term.isTerminal
• golang.org/x/sys/unix.IoctlGetTermios
• golang.org/x/sys/unix.ioctl

So yeah this all makes sense, considering we emulate linux/arm for wasip2 (since upstream doesn't support wasip2 in the stdlib). But the compiler should not have emitted these syscalls at least.

[aykevl]

Ok, here you go: #5054
Not a fix, but a better error message.

I don't know what the correct fix for this would be. A workaround would be to add the right build tags in a place like this but I doubt that will be accepted upstream. A proper fix would be to add support for wasip2 in Go so that we don't have to pretend to be linux/arm just to get the standard library working.