Closed
Description
What version of Go are you using (go version)?
$ go1.17.2 version go version go1.17.2 linux/amd64
Does this issue reproduce with the latest release?
Yes.
What operating system and processor architecture are you using (go env)?
go env Output
$ go1.17.2 env GOARCH="amd64" GOHOSTARCH="amd64" GOHOSTOS="linux" GOOS="linux"
What did you do?
I was trying to port https://github.com/openshift/oc to windows/arm64, and this came up as a missing indirect dependency. But as a simple test case to illustrate the issue:
$ echo abcdefg > tmp.txt
$ cat main.go
// https://github.com/handongyexingren/learnGo/tree/main/geektutu/mmap
package main
import (
"fmt"
"golang.org/x/exp/mmap"
)
func main() {
at, _ := mmap.Open("./tmp.txt")
buff := make([]byte, 2)
_, _ = at.ReadAt(buff, 4)
_ = at.Close()
fmt.Println(string(buff))
}
$ go1.17.2 mod init
go: creating new go.mod: module $PWD/test
go: to add module requirements and sums:
go mod tidy
$ go1.17.2 mod tidy
go: finding module for package golang.org/x/exp/mmap
go: found golang.org/x/exp/mmap in golang.org/x/exp v0.0.0-20211012155715-ffe10e552389
$ go1.17.2 build .
$ GOOS=windows GOARCH=amd64 go1.17.2 build .
$ GOOS=windows GOARCH=arm64 go1.17.2 build .
What did you expect to see?
Code compiles, creating an ARM64 test.exe
What did you see instead?
# golang.org/x/exp/mmap
$HOME/go/pkg/mod/golang.org/x/exp@v0.0.0-20211012155715-ffe10e552389/mmap/mmap_windows.go:111:12: [maxBytes]byte used as value
$HOME/go/pkg/mod/golang.org/x/exp@v0.0.0-20211012155715-ffe10e552389/mmap/mmap_windows.go:111:13: undefined: maxBytes
Notes
AFAICS the fix would be to add a mmap_windows_arm64.go file matching the contents of mmap_windows_amd64.go in golang.org/x/exp/mmap.