gd.dirs = append(gd.dirs, goDir)
			}
		}
		if fi, err := os.Stat(dir); err == nil && fi.IsDir() {
			lastDirs = append(lastDirs, dir)
		}
	}
	gd.dirs = append(gd.dirs, lastDirs...)
}

// isStandard reports whether path is a standard library for gccgo.
func (gd *gccgoDirs) isStandard(path string) bool {
	// Quick check: if the first path component has a '.', it's not