switch GOOS {
	case "aix", "darwin", "illumos", "ios", "solaris", "windows":
		return true
	case "openbsd":
		return GOARCH != "mips64"
	}
	return false
}

// mStackIsSystemAllocated indicates whether this runtime starts on a
// system-allocated stack.
func mStackIsSystemAllocated() bool {
	switch GOOS {
	case "aix", "darwin", "plan9", "illumos", "ios", "solaris", "windows":
		return true

//
// Using GOOS=android matches build tags and files as for GOOS=linux
// in addition to android tags and files.
//
// Using GOOS=illumos matches build tags and files as for GOOS=solaris
// in addition to illumos tags and files.
//
// Using GOOS=ios matches build tags and files as for GOOS=darwin
// in addition to ios tags and files.
//

	// This is read by readGccgoArchive in cmd/internal/buildid/buildid.go.
	if a.buildID != "" && cfg.BuildToolchainName == "gccgo" {
		switch cfg.Goos {
		case "aix", "android", "dragonfly", "freebsd", "illumos", "linux", "netbsd", "openbsd", "solaris":
			asmfile, err := b.gccgoBuildIDFile(a)
			if err != nil {
				return err
			}
			ofiles, err := BuildToolchain.asm(b, a, []string{asmfile})
			if err != nil {