Could you please share your go env printout?

GO111MODULE="on"
GOARCH="arm64"
GOBIN=""
GOCACHE="/Users/xxxxx/Library/Caches/go-build"
GOENV="/Users/xxxxx/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="arm64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/xxxxxxx/go/pkg/mod"
GOOS="darwin"
GOPATH="/Users/xxxxxx/go"
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/opt/homebrew/Cellar/go/1.16.2/libexec"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/opt/homebrew/Cellar/go/1.16.2/libexec/pkg/tool/darwin_arm64"
GOVCS=""
GOVERSION="go1.16.2"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/xxxxxx/logic/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/sy/ht4qsj_n66v25g6d7v91thtc0000gn/T/go-build1093755415=/tmp/go-build -gno-record-gcc-switches -fno-common"

Actually, #1024 might have fixed this already, but we forgot to tag a new release with it. Could you try GopherJS from master and see if you still have a problem? If not, I'll tag a new release tomorrow.

I've installed from master, and the error stills appearing.

Can you provide a minimal reproduction example and the exact commands you've used?

I've tried the following and it worked just fine:

package main

import (
        "fmt"
        "syscall"
)

func main() {
        buf := [4]byte{}
        fmt.Println(syscall.Read(syscall.Stdin, buf[:]))
        fmt.Println(buf)
}

$ GOOS=darwin GOARCH=arm64 gopherjs build .

Unfortunately, I don't have access to an M1 mac, so this is the closes I can get to reproducing an error.

@aragonet could you please provide a minimal reproduction example? Otherwise I'll assume this is a duplicate of #1023.

Sorry for answering a bit late. Just tried to build the code you provided and the same three lines of output appear.

gopherjs build .
../../../../../src/syscall/syscall_darwin.go:11:25: undeclared name: libc_stat64_trampoline
../../../../../src/syscall/syscall_darwin.go:13:25: undeclared name: libc_fstat64_trampoline
../../../../../src/syscall/syscall_darwin.go:15:25: undeclared name: libc_lstat64_trampoline

If there is any way I can help you find the problem I'll be pleased.

Ok, thanks for confirming this is still an issue. It is strange that it builds just fine for me despite setting GOOS/GOARCH to match yours. Perhaps, there's a deeper bug lurking about here... I'll investigate more sometime this week.