builderWorkDirs.Store(b, b.WorkDir)
		if cfg.BuildX || cfg.BuildWork {
			fmt.Fprintf(os.Stderr, "WORK=%s\n", b.WorkDir)
		}
	}

	b.backgroundSh = NewShell(b.WorkDir, nil)

	if err := CheckGOOSARCHPair(cfg.Goos, cfg.Goarch); err != nil {
		fmt.Fprintf(os.Stderr, "go: %v\n", err)
		base.SetExitStatus(2)
		base.Exit()
	}

	for _, tag := range cfg.BuildContext.BuildTags {
		if strings.Contains(tag, ",") {

		}
		return cur, false
	}

	goos, okGOOS := get("GOOS", cfg.Goos, build.Default.GOOS)
	goarch, okGOARCH := get("GOARCH", cfg.Goarch, build.Default.GOARCH)
	if okGOOS || okGOARCH {
		if err := work.CheckGOOSARCHPair(goos, goarch); err != nil {
			return err
		}
	}

	goexperiment, okGOEXPERIMENT := get("GOEXPERIMENT", cfg.RawGOEXPERIMENT, buildcfg.DefaultGOEXPERIMENT)
	if okGOEXPERIMENT {