Re: [Boost-build] PCH and property propagation

From: Vladimir Prus (ghost_at_[hidden])
Date: 2006-11-04 11:49:48

On Tuesday 24 October 2006 10:56, Bojan Resnik wrote:

>   Another issue when using the same pch for multiple targets, are the
> usage requirements of dependencies:
>
>     lib some-lib : : : <runtime-link>static ;
>     lib some-other-lib : : : <runtime-link>shared ;
>     exe hello : hello.cpp pch  some-lib : <define>FOO ;
>     exe hello2 : hello.cpp pch some-other-lib : <define>BAR ;
>
>   The usage requirements of some-lib should be propagated to the pch
> if compiling hello, and those of some-other-lib if compiling hello2.

Hmm, this seems to indicate that one cannot use a single PCH for all targets 
in entire project. That's bad, but I'm not sure what could be done about it.

>   I think it would be best to use one pch target for one project:
>
>     cpp-pch pch : pch.hpp ;
>     exe hello : hello.cpp pch : <define>FOO ;
>
>     cpp-pch pch2 : pch.hpp ;
>     exe hello2 : hello.cpp pch2 : <define>BAR ;

Isn't this a little bit too much work? Again, I'm not sure how improve on 
this.

- Volodya