go:linkname must refer to declared function or variable #51706
Description
What version of Go are you using (go version)?
$ go version go version go1.18 darwin/amd64
Does this issue reproduce with the latest release?
yes
What operating system and processor architecture are you using (go env)?
go env Output
$ go env GO111MODULE="on" GOARCH="amd64" GOBIN="" GOCACHE="/Users/wxj/Library/Caches/go-build" GOENV="/Users/wxj/Library/Application Support/go/env" GOEXE="" GOEXPERIMENT="" GOFLAGS="" GOHOSTARCH="amd64" GOHOSTOS="darwin" GOINSECURE="" GOMODCACHE="/Users/wxj/go/pkg/mod" GONOPROXY="" GONOSUMDB="" GOOS="darwin" GOPATH="/Users/wxj/go" GOPRIVATE="" GOPROXY="https://goproxy.io" GOROOT="/Users/wxj/sdk/go1.18" GOSUMDB="sum.golang.org" GOTMPDIR="" GOTOOLDIR="/Users/wxj/sdk/go1.18/pkg/tool/darwin_amd64" GOVCS="" GOVERSION="go1.18" GCCGO="gccgo" GOAMD64="v1" AR="ar" CC="clang" CXX="clang++" CGO_ENABLED="1" GOMOD="/Users/wxj/go/src/demo/go.mod" GOWORK="" 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 x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/85/j24r836d5ygfhjgsn4j5zr0m0000gn/T/go-build178809849=/tmp/go-build -gno-record-gcc-switches -fno-common"
What did you do?
$ tree . ├── 1.s ├── go.mod ├── go.sum ├── inner │ └── inner.go └── main.go
$ cat inner.go
package inner
type name struct {
name string
}
func hello() {
n := name{
name: "jack",
}
println("hello", n.name)
}
$ cat main.go
package main
import (
`fmt`
_ "demo/inner"
_ "unsafe"
)
//go:linkname hello demo/inner.hello
func hello()
//go:linkname runtimeG runtime.g
type runtimeG struct {
}
func main() {
hello()
r := runtimeG{}
fmt.Println(r)
}
go run main.go
What did you expect to see?
hello jack
{}
What did you see instead?
# command-line-arguments ./main.go:13:3: //go:linkname must refer to declared function or variable
I think runtimeG is declared in main.go, And it works well in version 1.17.8 and 1.16.4
Maybe I'm using it incorrectly, hope it clears my mind, thanks very much!