Re: [Boost-build] Propagated feature that doesn't generate build directory

From: K. Noel Belcourt (kbelco_at_[hidden])
Date: 2007-12-06 13:56:35

On Dec 5, 2007, at 11:03 PM, Rene Rivera wrote:

> K. Noel Belcourt wrote:
>> feature lapack : vendor source : propagated ;
>>
>> When I run bjam, I can select either lapack=vendor or lapack=source
>> and everything works fine.  The only problem is that because the
>> lapack feature is propagated, an entire new source tree (with lapack-
>> source) is created when all I really want is to build one library
>> from source and link it in (i.e. the lapack library doesn't introduce
>> any kind of link incompatibility).  Removing the propagated attribute
>> clearly won't build the lapack library from source code.
>>
>> Is there another (combination of) attribute(s) that would propagate
>> the lapack=source feature to all targets, but not cause any new
>> directories in the build tree?
>
> Make it "incidental"
> <http://beta.boost.org/doc/tools/build/doc/html/bbv2/reference/ 
> definitions.html#bbv2.reference.features.attributes>.

Hi Rene,

When I tried changing the lapack feature to be incidental, it did not  
work (the documentation says "incidental features are assumed not to  
affect build properties").  The lapack=source feature is not present  
in the property-set for the lapack product.

Any other ideas?

-- Noel