Comment # 4 on bug 1133254 from Martin Li��ka

(In reply to Aaron Puchert from comment #3)
> LLVM is built in two stages: the first stage builds only Clang using GCC,
> the second stage uses that Clang to compile the entire package. Clang has
> its own form of LTO, but do you want to use that?
> 
> Then you'd have to build llvm-ar, llvm-ranlib, LLVMgold in addition to clang
> in the first stage, and pass them into the second stage. I'm trying this out
> with llvm7 in my home repo right now. However, I think there is probably not
> much benefit to be gained, because LLVM has a lot of inline code in headers.

That's not true, LTO creates a faster binaries with LTO.

> In addition, LLVM builds already take very long, and even just ThinLTO is
> going to make that worse.

For now, I would not make the build even longer.