}

	// Handle 'go env -w' and 'go env -u' before calling buildcfg.Check,
	// so they can be used to recover from an invalid configuration.
	if *envW {
		runEnvW(args)
		return
	}

	if *envU {
		runEnvU(args)
		return
	}

	buildcfg.Check()
	if cfg.ExperimentErr != nil {
		base.Fatal(cfg.ExperimentErr)
	}

	for _, arg := range args {

		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 {