[Boost-build] Creating own features without changing the compilation path

Subject: [Boost-build] Creating own features without changing the compilation path
From: Max Moorkamp (mm489_at_[hidden])
Date: 2013-11-18 12:15:27

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Hi,

I have several parts of my libraries and programs that I only want to
compile under certain conditions. From searching the web and the boost
build documentation, user defined features seem to be the right thing
to achieve this. In fact, having something like

feature.feature gpu : off on : composite ;
feature.compose <gpu>on : <define>HAVEGPU ;

feature.feature lapack : off on : composite ;
feature.compose <lapack>on : <define>HAVELAPACK ;

and some conditional requirements do the job. However, each of these
features results in an addition to the output path, e.g.

MT/bin/gcc-4.6/release/gpu-on/lapack-on/threading-multi/MTCovar_test

Now, I should have a few more of these features to enable/disable some
non-essential but desirable parts of the code on certain machines by
which time the path will become very convoluted. I understand the idea
behind the paths, but in my case on a given machine compilation will
happen with the same set of features, so it is perfectly acceptable to
me to recompile everything if I change the value of a feature.

Is there a way to switch this behavior off? Is there an alternative
that does what I want?

Thanks for any pointers

Max

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