[Boost-build] Parallel builds and msvc precompiled header support.

From: Jurko Gospodnetiæ (jurko.gospodnetic_at_[hidden])
Date: 2008-01-17 15:26:14

   Hi.

   I just set up my project's build system to make use of multiple 
processors by using Boost Jam's -j command-line option. Everything works 
fine (Windows, MSVC 7.1) except that when the precompiled headers get 
rebuilt it does not seem to recognize this and starts multiple actions 
at the same time that all attempt to create them. If you cancel that 
build after one of the actions actually does build the precompiled 
headers the next build goes through flawlessly.

   Just a quick possible bug report, as I do not currently have the time 
to look into it in more detail.

   Hope this helps.

   Best regards,
     Jurko Gospodnetiæ