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

From: K. Noel Belcourt (kbelco_at_[hidden])
Date: 2007-12-06 16:08:59

On Dec 6, 2007, at 12:58 PM, Vladimir Prus wrote:

> K. Noel Belcourt wrote:
>
>> 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?
>
> Well, I think the feature should be *both* propagated and incidental.

Well this ( feature lapack : vendor source : propagated  
incidental ; ) doesn't work either.  It never builds the lapack  
library from source code.  If this should work, then perhaps it's a  
bug?  Would it help if I made a small example problem that you could  
test for yourself.

-- Noel