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

From: Philip Craig (philip_at_[hidden])
Date: 2006-04-26 08:35:29

Just to add my datapoint again.

boost build can't be used for serious projects in msvc++ until all of 
pch and -jn (where n > 1) and pdb are working.

The performance hit for switching to boost build is just too great 
without these things.

> Vladimir Prus 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
>