Re: [Boost-build] [PING] State of PCH/msvc

From: Phillip Seaver (phil_at_[hidden])
Date: 2006-04-26 08:19:51

Vladimir Prus wrote:
> On Wednesday 26 April 2006 16:07, Janssen, Olaf  ST/HZA-TBE wrote:
>   
>>> PCH is nowhere close to "release" state. There are numerous
>>> issues with
>>> PCH on MSVC:
>>>
>>> 6. Some other subtle issues I can't remember.
>>>       
>> parallel build does not work (that might also be difficult to implement)
>>     
>
> What are specific issues with parallel build? There should be a dependency 
> from exe to the used pch, to PCH should be created before exe is compiled?
>
> Or the problem is that two copies of compiler try to use the same PCH? It's 
> possible to serialize execution of compile actions for that case.
>
> - Volodya

The latter.  You run into the same problem with .pdb files, which is one
reason I haven't finished it.  I just run without -j2 for those builds. 
Would the serialization force it to do a single thread (even if I had
-j2) or would it build a separate target that didn't use the same file?

Phillip