Correction. Clang used to compile much faster years ago.
But nowadays GCC-6 actually compiles faster than clang-3.8.0.
See e.g.: <a href="http:&#x2F;&#x2F;hubicka.blogspot.com&#x2F;2016&#x2F;03&#x2F;building-libreoffice-with-gcc-6-and-lto.html" rel="nofollow">http:&#x2F;&#x2F;hubicka.blogspot.com&#x2F;2016&#x2F;03&#x2F;building-libreoffice-wit...</a>