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On Wed, Oct 31, 2018 at 3:11 PM Nicolai Hähnle via llvm-dev <llvm-dev@lists.llvm.org> wrote:

Besides, how on earth are you using LLVM that cmake times are an issue?
Given that cmake times seem to be the only argument you have in favor of
GN...

I just measured the typical case (for LLVM only, debug build, all
non-experimental targets enabled) by touching all files. cmake takes 5
seconds to run, while the build as a whole takes about 5 minutes. (This
is on Ubuntu 18.10, in case that matters.)

I am using CMake with LLVM with all targets OFF except for x86\. Only clang, lldb, and lld enabled.

$ timecmd cmake ..\\..\\..\\..\\llvm-mono\\llvm

command took 0:0:34.05 (34.05s total)