RFC: Precompiled Headers for Wine Build (GSoC?)

[Francois Gouget]

On Sun, 14 Feb 2016, Kyle Auble wrote:
[...]
> It's been several months so I could be completely misremembering, but I want
> to say ccache didn't seem to help even subsequent builds of wine on my system
> (which has really old hardware). Just keeping the object files for make (which
> is a no-go for final tests) seemed to make a much bigger difference.

Not sure why keeping the object files would be a no-go (at least for 
preprocessor mode).

However, note that nowadays ccache has two modes:
 * 'Preprocessor mode' where where ccache runs the preprocessor on the 
   source code and hashes the result to find the object file in its 
   cache.

 * 'Direct mode' where ccache hashes the source code and include files 
   directly which lets it skip the preprocessor step too. There's a 
   catch in this mode which is that creating a new header file may 
   change the code that would be compiled, without ccache detecting it.

Direct mode should improve compilation times at least as much as 
precompiled headers.


-- 
Francois Gouget <fgouget at free.fr>              http://fgouget.free.fr/
                     Avoid the Gates of Hell - use Linux.