args = args[1:]
			if goexp != "" {
				goexp += ","
			}
			goexp += args[0]
			runenv = append(runenv, "GOEXPERIMENT="+goexp)

		case "-godebug": // set GODEBUG environment
			args = args[1:]
			if godebug != "" {
				godebug += ","
			}
			godebug += args[0]
			runenv = append(runenv, "GODEBUG="+godebug)

		default:
			flags = append(flags, args[0])
		}
		args = args[1:]
	}

		goCmd = append(goCmd, "-v")
	}

	// Force only one process at a time on vx32 emulation.
	if gohostos == "plan9" && os.Getenv("sysname") == "vx32" {
		goCmd = append(goCmd, "-p=1")
	}

	runEnv(workdir, ShowOutput|CheckExit, env, append(goCmd, args...)...)
}

func checkNotStale(env []string, goBinary string, targets ...string) {
	goCmd := []string{goBinary, "list"}
	if noOpt {