From: Vladimir Prus (ghost_at_[hidden])
Date: 2006-04-26 08:24:10
On Wednesday 26 April 2006 16:19, Phillip Seaver wrote:
> 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?
It would serialize compilation of all cpp files that use a single file.
Creating a second PCH copy sounds non-trivial task.
-- Vladimir Prus http://vladimir_prus.blogspot.com Boost.Build V2: http://boost.org/boost-build2
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