Re: [jamboost] Re: Scons vs BBv2

From: Phillip Seaver (phil_at_[hidden])
Date: 2005-09-14 11:22:58

Vladimir Prus wrote:

> Hmm.. why didn't you speak up before? It's the first time a user reports
> precompiled header support as a showstopper; if I knew it before such 
> support
> would probably be already implemented.

Just a note in case you do start implementing this -- I tried an 
experiment yesterday and added <cflags>/YX ("Automatic Use of 
Precompiled Headers") to my build and it won't work if you do -j2. Both 
compiler processes try to open the .pch file and lock it. A couple of 
weeks ago, I played with .pdb file generation and ran into the same 
problem. I can create .pdb files as long as I don't use the -j option.

Something else that could be useful for speeding up builds would be 
multiple source files on the same command-line. I don't know how hard 
would be, though, since I haven't had time to learn the internals of 
boost.build yet (any pointers on how to start?). I know gcc and vc++ 
allow you to specify multiple source files on the command-line. 
Unfortunately, gcc doesn't let you specify an output directory for the 
object files like vc++ does.

Phillip