Hi WebKittens,
As you might be aware, we at Opera now have Chromium based products which
means that we compile WebKit quite a lot. A big issue for us and our
automatic systems has been the long time needed to compile WebKit (inside
Chromium), especially in Windows.
The big compilation time difference between Linux and Windows didn't seem
to make sense so we did some analysis of what was going on and we think
that we have found a cause. In WebKit include directives are without path,
and instead the compiler is given a very long list of directories to
search through. That process takes a lot of time in Windows. It must take
some time in OSX and in Linux too but probably less.
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.
There is no reason to think the same reduction doesn't apply to all
projects and then there are many many minutes to save for developers and
build servers here.
Caveat: I don't know if the resulting binary is correct.
Is this something that has been talked about in the past, and would you be
interested in replacing the long list of directories to search for every
include with paths (relative some good base) directly in the include
directives?
/Daniel
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