var FramePointerEnabled = GOARCH == "amd64" || GOARCH == "arm64"

// ParseGOEXPERIMENT parses a (GOOS, GOARCH, GOEXPERIMENT)
// configuration tuple and returns the enabled and baseline experiment
// flag sets.
//
// TODO(mdempsky): Move to internal/goexperiment.
func ParseGOEXPERIMENT(goos, goarch, goexp string) (*ExperimentFlags, error) {
	// regabiSupported is set to true on platforms where register ABI is

}

func hasGoexperiment(s *script.State, value string) (bool, error) {
	GOOS, _ := s.LookupEnv("GOOS")
	GOARCH, _ := s.LookupEnv("GOARCH")
	goexp, _ := s.LookupEnv("GOEXPERIMENT")
	flags, err := buildcfg.ParseGOEXPERIMENT(GOOS, GOARCH, goexp)
	if err != nil {
		return false, err
	}
	for _, exp := range flags.All() {
		if value == exp {
			return true, nil
		}

	flags.BoolVar(&conf.FakeImportC, "fakeImportC", false, "")
	flags.StringVar(&gotypesalias, "gotypesalias", "", "")
	if err := parseFlags(srcs[0], flags); err != nil {
		t.Fatal(err)
	}

	exp, err := buildcfg.ParseGOEXPERIMENT(runtime.GOOS, runtime.GOARCH, goexperiment)
	if err != nil {
		t.Fatal(err)
	}
	old := buildcfg.Experiment
	defer func() {
		buildcfg.Experiment = old
	}()
	buildcfg.Experiment = *exp

	flags.BoolVar(&conf.FakeImportC, "fakeImportC", false, "")
	flags.StringVar(&gotypesalias, "gotypesalias", "", "")
	if err := parseFlags(srcs[0], flags); err != nil {
		t.Fatal(err)
	}

	exp, err := buildcfg.ParseGOEXPERIMENT(runtime.GOOS, runtime.GOARCH, goexperiment)
	if err != nil {
		t.Fatal(err)
	}
	old := buildcfg.Experiment
	defer func() {
		buildcfg.Experiment = old
	}()
	buildcfg.Experiment = *exp

	// experiments enabled by RawGOEXPERIMENT.
	CleanGOEXPERIMENT = RawGOEXPERIMENT

	Experiment    *buildcfg.ExperimentFlags
	ExperimentErr error
)

func init() {
	Experiment, ExperimentErr = buildcfg.ParseGOEXPERIMENT(Goos, Goarch, RawGOEXPERIMENT)
	if ExperimentErr != nil {
		return
	}

	// GOEXPERIMENT is valid, so convert it to canonical form.
	CleanGOEXPERIMENT = Experiment.String()

			return err
		}
	}

	goexperiment, okGOEXPERIMENT := get("GOEXPERIMENT", cfg.RawGOEXPERIMENT, buildcfg.DefaultGOEXPERIMENT)
	if okGOEXPERIMENT {
		if _, err := buildcfg.ParseGOEXPERIMENT(goos, goarch, goexperiment); err != nil {
			return err
		}
	}

	return nil
}

// PrintEnv prints the environment variables to w.
func PrintEnv(w io.Writer, env []cfg.EnvVar, onlyChanged bool) {