Re: Profiling compilation time

[Yang Zhang <yanghatespam at gmail dot com>]

Ian Lance Taylor wrote:
> In my experience, when not optimizing, C++ compilation time is normally
> dominated by parsing and name lookup.

From an earlier thread "Precompiled headers and templates:"

Ian Lance Taylor wrote:
> However, including explicit instantiations in the precompiled header
> won't make any significant difference to compilation time.  The
> precompiled header saves on parsing and name lookup time, it doesn't
> save on code generation time.
>
> I don't personally find that precompiled headers help with compilation
> time all that much.  However, for some projects, ones with millions of
> lines of header files included in every compilation, I expect that they
> would help.

So PCHs only help with a very small fraction of the parsing + name 
lookup?  (Already established that they wouldn't include template 
instantiation component of paths.)
--
Yang Zhang
http://www.mit.edu/~y_z/