mirror of
https://github.com/golang/go
synced 2024-11-23 04:30:03 -07:00
65 lines
1.2 KiB
Go
65 lines
1.2 KiB
Go
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// +build !nacl
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// run
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Issue 11771: Magic comments should ignore carriage returns.
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package main
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"os/exec"
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"path/filepath"
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"runtime"
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)
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func main() {
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if runtime.Compiler != "gc" {
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return
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}
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dir, err := ioutil.TempDir("", "go-issue11771")
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if err != nil {
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log.Fatalf("creating temp dir: %v\n", err)
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}
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defer os.RemoveAll(dir)
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// The go:nowritebarrier magic comment is only permitted in
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// the runtime package. So we confirm that the compilation
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// fails.
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var buf bytes.Buffer
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fmt.Fprintln(&buf, `
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package main
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func main() {
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}
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`)
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fmt.Fprintln(&buf, "//go:nowritebarrier\r")
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fmt.Fprintln(&buf, `
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func x() {
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}
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`)
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if err := ioutil.WriteFile(filepath.Join(dir, "x.go"), buf.Bytes(), 0666); err != nil {
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log.Fatal(err)
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}
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cmd := exec.Command("go", "tool", "compile", "x.go")
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cmd.Dir = dir
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output, err := cmd.CombinedOutput()
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if err == nil {
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log.Fatal("compile succeeded unexpectedly")
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}
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if !bytes.Contains(output, []byte("only allowed in runtime")) {
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log.Fatalf("wrong error message from compiler; got:\n%s\n", output)
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}
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}
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