This post seems quite disingenuous. Clang is way cool and a breath of fresh air, but TFA only mentions compile times and at no point does it mention the characteristics of the output binary (size, performances). It also omits the compilation options (the optimization levels would be a pretty good start).

Because it's fast and pretty small, Clang is probably the best thing you can use during development, but in my experience — no 2.8 yet of course — it produces binaries pretty consistently slower than gcc's and is therefore a worse option for production (and for CI servers and integration of course)