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From: Rene Rivera (grafikrobot_at_[hidden])
Date: 2007-12-06 01:03:20

K. Noel Belcourt wrote:
> Hi,
> I got some libraries that depend on Lapack (optmized math kernels).
> On some systems there is no vendor supplied library so I need to
> build Lapack from source code, other systems have vendor supplied
> libraries I'd like to link against. Here's my problem, I've created
> a feature:
> 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"

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