[lldb-dev] interesting note on build times: configure/make vs. cmake/ninja
tfiala at google.com
Thu Feb 6 17:56:06 PST 2014
Update: fwiw - I am getting totally inaccurate results when using the gold
debugger + cmake/ninja. I'll have more to say later, but for sure
something is not building correctly. I'll have to isolate what is causing
lldb-gdbserver built via cmake/ninja/gold linker was seg faulting, and
neither lldb nor gdb could tell me anything useful about the top few frames
of the core. Building the same code with configure/(g)make gave me
different results (I got the assert failure printed), and the backtrace
looked quite a bit different.
So - until I figure out which piece of the puzzle isn't working, I don't
think I'd recommend Ubuntu ninja/cmake/gold linker until I figure out which
piece (if only one) that is acting funny.
On Thu, Feb 6, 2014 at 11:40 AM, Todd Fiala <tfiala at google.com> wrote:
> Thanks, Richard.
> I spent some time trying that out this morning. For Ubuntu, I was able to
> do this with 'sudo apt-get install binutils-gold'. This improved my lldb
> build time with cmake/ninja by between 6 and 7%. Thanks for the suggestion!
> On Wed, Feb 5, 2014 at 7:48 PM, Richard Mitton <richard at codersnotes.com>wrote:
>> I found with building llvm/lldb, switching your default linker to gold
>> instead of ld helps too.
>> Todd Fiala wrote:
>> Hi all,
>> Just thought I'd pass along that I've just did a build time comparison
>> between our standard lldb build setup: configure + (g)make (i.e. configure
>> && make -j32), vs. cmake + ninja (i.e. cmake -GNinja && ninja). On an HP
>> z620 with 32 virtual procs on ssd, it takes me just under 10 minutes to
>> build lldb with configure/make. The same machine with ninja + cmake takes
>> 4.25 minutes. *huge* speedup.
>> We'll be moving in that direction on our dev setups based on that
>> change. If for some reason we hit any hiccups with that, I'll be sure to
>> tell you about them.
>> Todd Fiala | Software Engineer | tfiala at google.com | 650-943-3180
>> lldb-dev mailing listlldb-dev at cs.uiuc.eduhttp://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev
> Todd Fiala | Software Engineer | tfiala at google.com | 650-943-3180
Todd Fiala | Software Engineer | tfiala at google.com | 650-943-3180
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