[webkit-dev] Compiling WebKit up to 25% faster in Windows?

Nico Weber thakis at chromium.org
Wed Mar 27 12:20:43 PDT 2013

On Wed, Mar 27, 2013 at 12:05 PM, Brent Fulgham <bfulgham at gmail.com> wrote:

> Hi Daniel,
> On Tue, Mar 26, 2013 at 11:21 AM, Daniel Bratell <bratell at opera.com>wrote:
>> As an experiment we took the (chromium) project webcore_dom, that
>> normally compiles in 56 seconds in Windows on a generic computer and
>> "fixed" it. Removing the many include paths in the build system and instead
>> specifying the path in the include directives changed that to 42 seconds, a
>> 25% reduction.
> I thought that much of this was supposed to be addressed by the use of
> precompiled headers.  Presumably, if the header files are properly
> incorporated into the PCH, shouldn't any gains from relative paths be
> small? Obviously your statistic says otherwise, but I'm not sure that a
> single test on a single system is definitive proof of anything.

I thought PCHs are mostly for system headers that don't change often (
else every .h change would require recompiling _all_ cc files, no?

> Did you run the test multiple times to get a feel for how reproducible the
> improvements was? I know I have fooled myself in the past into thinking I
> had improved something, only to discover that unrelated computer activity
> (e.g., backups, virus scans, etc.) were contributing to slow build times.
> -Brent
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