https://blog.wongcw.com/2018/12/17/%e9%96%8b%e7%99%bc%e8%80%85%e5%b0%8d%e6%af%94%e7%94%a8gcc-%e5%92%8cclang-%e6%a7%8b%e5%bb%ba%e7%9a%84firefox/
開發者對比用GCC 和Clang 構建的Firefox