return v, changed
	}
	return def, false
}

var SumdbDir = gopathDir("pkg/sumdb")

// GetArchEnv returns the name and setting of the
// GOARCH-specific architecture environment variable.
// If the current architecture has no GOARCH-specific variable,
// GetArchEnv returns empty key and value.
func GetArchEnv() (key, val string, changed bool) {
	switch Goarch {
	case "arm":
		return "GOARM", GOARM, goARMChanged

		env = append(env, cfg.EnvVar{Name: "GCCGO", Value: work.GccgoBin, Changed: true})
	} else {
		env = append(env, cfg.EnvVar{Name: "GCCGO", Value: work.GccgoName})
	}

	goarch, val, changed := cfg.GetArchEnv()
	if goarch != "" {
		env = append(env, cfg.EnvVar{Name: goarch, Value: val, Changed: changed})
	}

	cc := cfg.Getenv("CC")
	ccChanged := true
	if cc == "" {
		ccChanged = false