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/
