2018
https://www.reddit.com/r/cpp/comments/9x08ft/30_faster_windows_builds_with_clangcl_and_the_new/
    http://blog.llvm.org/2018/11/30-faster-windows-builds-with-clang-cl_14.html

2017
Elizondo - Optimizing compilation times with Templates
    https://www.youtube.com/watch?v=NPWQ7xKfIHQ
    https://github.com/eduardo-elizondo/cppcon2017

-ftime-report
templight
-Xtemplight -profiler