var internal/buildcfg.GOOS

4 uses

	internal/buildcfg (current package)
		cfg.go#L25: 	GOOS      = envOr("GOOS", defaultGOOS)
		cfg.go#L136: 	if GOOS == "android" && GOARCH == "arm" {
		exp.go#L32: 	flags, err := ParseGOEXPERIMENT(GOOS, GOARCH, envOr("GOEXPERIMENT", defaultGOEXPERIMENT))

	go/build
		build.go#L337: 	c.GOOS = buildcfg.GOOS