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

From: Vladimir Prus (ghost_at_[hidden])
Date: 2007-12-07 01:00:41

K. Noel Belcourt wrote:

> 
> 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.

Yes, it would help.

Thanks,
Volodya