Re: [Boost-build] How to set proper scope in a generator rule?

From: Daniel Einspanjer (deinspanjer_at_[hidden])
Date: 2006-02-14 13:43:48

"Vladimir Prus" <ghost_at_[hidden]> wrote in message 
news:200602141136.40250.ghost_at_cs.msu.su...
> Then, you can scope 'XSL_TOOL' on target, like this:
>
>  rule whatever ( targets * : sources * : properties * )
>  {
>       XSL_TOOL on $(target[1]) = ....... ;
>  }
>
> This variable will be visible only inside the action. If the xsl command 
> is
> the same for all actions, it might be easier to make it a global variable:
>
>  rule init ( ............. )
>  {
> XSL_TOOL = ........ ;
>  }
>
> If you need to handle more then one version of your xsl tool, you'd need 
> more
> complex mechanism, something like:
>
>  rule init ( version : command )
>  {
> flags your-module.whatever XSL_TOOL <xsl-tool-version>$(version)
>           : $(command) ;
>  }

Wow.  Thanks for the detailed response.  I only understand a bit of it so 
far, but you answered my question and gave me stuff to digest. :)