Re: [jamboost] Re: Conditional including library based on platform

From: Pedro Ferreira (pedro.ferreira_at_[hidden])
Date: 2005-05-19 12:55:17

----- Original Message ----- 
From: "jjanzer0" <yahoo_at_[hidden]>
To: <jamboost_at_[hidden]>
Sent: Thursday, May 19, 2005 6:47 PM
Subject: [jamboost] Re: Conditional including library based on platform

>I have no problem using whatever it needs to get it done, I'm still
> learning this system out (I have a lot more experience with GNU's
> utils) and just having a hard time in general with the documentation.
> 
> I think my problem is that I don't really understand how alias will
> help me, I've read:
> http://boost.sourceforge.net/boost-build2/doc/html
> /bbv2/advanced/builtins/targets.html#bbv2.builtins.alias
> But it's much more of a general overview.
> 
> Also from the first example you sent you specified the conditional on
> toolset, but I don't think that's a good approach considering a
> windows user might be using the toolset "gcc" instead of something
> obvious like msvc.

You can select on whatever condition you see fit, e.g.:

lib lwsock32 : : <name>wsock32 <os>NT ;
alias lwsock32 ;

This will use the lib on Windows and nothing elsewhere.

Pedro

> Perhaps the problem could really be solved by reading documentation
> but I'm having a hard time finding a good set of docs with tutorials
> examples etc... for V2.
> 
> Any suggestions or pointers would be greatly appreciated.
> 
> --- In jamboost_at_[hidden], "Pedro Ferreira"
> <pedro.ferreira_at_m...> wrote:
>> > Ok I think I'm almost there now... I just have one more question.
> I
>> > get an error if lwsock32-name is empty during the call:
>> > lib lwsock32 : : <name>$(lwsock32-name) ;
>> > "
>> > *** argument error
>> > * rule object(linking-generator)@2.run ( project name ? :
> property-set
>> > : sources + : multiple ? )
>> > * called with: ( Jamfile</home/zeta/code/lanthera/src/client>
> lwsock32
>> > : object(property-set)@15 : : )
>> > * missing argument sources
>> > "
>> >
>> > if i set the condtion that I test for LINUX to any value it
> compiles
>> > fine, but I'd prefer not to have any value set... like I want
> lwsock32
>> > to really just be NULL, does that make sense?
>> 
>> Right... and this is a tricky one: you can't declare a lib that
> neither has 
>> a <name> nor sources. That's why I initially proposed to use an
> alias.
>> Is there a problem for you to use an alias? We do it here all the
> time and 
>> it works really well.
>> 
>> Pedro
> 
> 
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