Re: [Boost-build] late binding with tools based on property settings

From: Vladimir Prus (ghost_at_[hidden])
Date: 2006-01-26 08:01:03

On Thursday 26 January 2006 15:36, Mark Evans wrote:
> First of all, I'd like to extend my gratitude and  admiration to the
> creators of this cool toolset.  I'm sold on the  concept.
>
>   Now as I said in an earlier email I'm in the process of defining a new 
> toolset for HP NonStop (think Tandem) compilers.  I'm wresting  with the
> following problem:
>
>   The choice of linker tool (ld, nld, eld) for a given program or library 
> depends on target architecture variant and an attribute (pic=yes|no)  that
> can vary within the source tree.  My toolset "nsk" init rule,  thus, cannot
> fix the linker program for the entire source tree.  I  can employ a perl
> script that looks through the flags and then invokes  the appropriate
> linker.  But how would you experts tackle this  problem with bjam rules? 
> Is there an example in the tools  directory or elsewhere that illustrates a
> good pattern for this?

I'd take the simple approach:

rule init
{
        .ld = your-detection-code-for-ld-binary-location ;
    .nld = your-detection-code-for-nld-binary-location ;
}

rule compile ( targets * : sources * : properties * )
{
        if <use-nld>true in $(properties)
        {
                TOOL on $(targets) = $(.nld) ;
        }
        else
        {
                TOOL on $(targets) = $(.ld) ;
        }
}

action compile
{
        $(TOOL) -o $(<) $(>)
}

>   I would search the bjam archives but there doesn't seem to be a search 
> function at the website.  

Hmm, do we indeed have no search on lists.boost.org? Anybody has any ideas if 
this can be added?

- Volodya