// starts with "_cgo_". Make sure that the comments in those files
	// are safe. This is a backstop against people somehow smuggling
	// such a comment into a file generated by cgo.
	if cfg.BuildToolchainName == "gc" && !cfg.BuildN {
		var flags []string
		for _, f := range outGo {
			if !strings.HasPrefix(filepath.Base(f), "_cgo_") {
				continue
			}