[llvm-dev] GN build roundtable summary; adding GN build files to the repo

[Zachary Turner via llvm-dev]

And by the way, that is with my cache already populated.  Here it is on a
fresh build directory where it has to generate everything.  (this time
release build)

$ timecmd cmake -G Ninja -DLLVM_ENABLE_PROJECTS=clang;lld;lldb
-DLLVM_TARGETS_TO_BUILD=X86 -DCMAKE_BUILD_TYPE=Release
..\..\..\..\llvm-mono\llvm
<output snipped>
command took 0:0:57.42 (57.42s total)

This is on a 48-core machine btw, with an SSD.

On Wed, Oct 31, 2018 at 3:29 PM Zachary Turner <zturner at google.com> wrote:

> On Wed, Oct 31, 2018 at 3:11 PM Nicolai Hähnle via llvm-dev <
> llvm-dev at 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
> <output snipped>
> command took 0:0:34.05 (34.05s total)
>
>
>
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