Re: [Boost-build] how to add a dependency to a dependency

Subject: Re: [Boost-build] how to add a dependency to a dependency
From: Stjepan Rajko (stjepan.rajko_at_[hidden])
Date: 2009-02-02 18:35:33

On Sun, Jan 25, 2009 at 4:54 PM, Stjepan Rajko <stjepan.rajko_at_[hidden]> wrote:
> On Sat, Jan 24, 2009 at 11:24 AM, Steven Watanabe <watanabesj_at_[hidden]> wrote:
>>
>> Instead of using a free feature, you can use a composite feature:
>>
>> feature use_window_manager_impl : : dependency free ;
>> feature use_window_manager : : composite propagated ;
>>
>> rule define-window-manager ( name : target )
>> {
>>   feature.extend use_window_manager : $(name) ;
>>   feature.compose <use_window_manager>$(name) :
>> <use_window_manager_impl>$(target) ;
>> }
>>
>> This will also have the effect that you'll get separate build directories
>> for
>> each window manager.
>>
>
> Thanks again Steven, this is a good idea.  I got something to work
> based on your suggestion in a simplified case, but am still having
> problems with my general situation.  I have this in one Jamfile:
>
> feature.feature use_window_manager : : composite propagated ;
>
> In a Jamfile that describes how to link to the system glut / openGL, I
> have this:
>
> [snip]
>
> *** Alternative 3 (doesn't work) ***
>
> # lib glut, glut32, opengl32, glu32...
>
> alias platform_glut : : : :
>        <toolset>gcc:<library>glut
>        <toolset>darwin:<linkflags>"-framework GLUT -framework OpenGL"
>        <toolset>msvc:<library>glut32
>        <toolset>msvc:<library>opengl32
>        <toolset>msvc:<library>glu32
>        ;
>
> feature.extend use_window_manager : platform_glut ;
> feature.compose <use_window_manager>platform_glut
>        : <library>/boost/guigl/platform//platform_glut ;
>
> # /boost/guigl/platform//platform_glut is the alias platform_glut
>
> *** End alternative 3 ***
>
> The above fails when a target has <use_window_manager>platform_glut in
> requirements, claiming recursion in main target references
> (platform_glut is built twice).  I am assuming that since
> platform_glut becomes a dependency of of the target, it is added as a
> dependency to itself.
>

I finally got this to work:

feature.feature use_window_manager : none : composite propagated ;

...

feature.extend use_window_manager : platform_glut ;
feature.compose <use_window_manager>platform_glut
        : <library>/boost/guigl/window_manager//platform_glut/<use_window_manager>none
;

Explicitly setting /<use_window_manager>none in the last line avoids
the recursion.  Hackish, but oh well.

Thanks again for your help.

Stjepan