Re: [Boost-build] Conditional targets not resolving properly

Subject: Re: [Boost-build] Conditional targets not resolving properly
From: Vladimir Prus (ghost_at_[hidden])
Date: 2009-09-14 05:01:09

On Thursday 10 September 2009 Johan Larsson wrote:

> Hello.
> 
> As part of a project, I have a library with an associated Jamfile I need to
> build. I want to build this particular library as a static lib, so I've
> added <link>static to the project requirements in the Jamfile for the
> library. So far so good.
> 
> However, I also want to exclude a particular source file from the library if
> I use a particular toolset (gcc in this case). So I've created two targets;
> one with all the sources and no particular requirements, and one without the
> source file in question with <toolset>gcc added as a requirement, like so:
> 
> 
> 
> project A
>   : requirements
>     <link>static
>     <toolset>gcc:<cxxflags>-DNO_SMART
>   : usage-requirements
>     <linkflags>-lA
>     <include>.
>   ;
> 
> alias commonsources
>   :  (snip)
>   ;
> 
> lib libA
>   : commonsources
>     SOURCE.cpp
>   ;
> 
> lib libA
>   : commonsources
>   : <toolset>gcc
>   ;
> 
> The problem is that when building with a toolset that is not gcc, bjam fails
> to find an appropriate target. The output it gives me is as follows:
> error: No best alternative for ./libA
>     next alternative: required properties: <link>static
>         not matched
>     next alternative: required properties: <link>static <toolset>gcc
>         not matched

Johan, 

you are running into a known issue:

        https://zigzag.lvk.cs.msu.su:7813/boost.build/ticket/16

Can you let me know if the workarounds suggested by Matthew and Phillip
work for you?

Thanks,
Volodya