[Boost-build] address-model and optional feature

Subject: [Boost-build] address-model and optional feature
From: Renaud Lepère (renaud.lepere_at_[hidden])
Date: 2010-09-01 03:51:51

I'm trying to install built libraries somewhere depending if this is 32 
bits or 64 bits binaries. So i try to do something like this:

install myinstall
        : myproject
        : <address-model>32:<location>../build/bin				  	 
<address-model>64:<location>../build/bin64 ;

But sometimes, i don't specify address-model (this leads to a 32bit 
build in this case) but in this case the location of the myinstall rule 
is not set correcty?

I have seen under buildin.jam that the address-model is an optional feature.

feature.feature address-model : 16 32 64 32_64 : propagated optional ;

The documentation (*) tells that the default value for address-model is 
16bits ? What is the good way to slove my problem ?

Should i say something like   ?

install myinstall
        : myproject
        : <location>../build/bin				
           <address-model>32:<location>../build/bin				  	 
<address-model>64:<location>../build/bin64 ;

Thanks,

Renaud

(*) bbv2 manual
# optional

An optional feature is a feature that is not required to appear in a 
build specification. Every non-optional non-free feature has a default 
value that is used when a value for the feature is not otherwise 
specified, either in a target's requirements or in the user's build 
request. [A feature's default value is given by the first value listed 
in the feature's declaration. -- move this elsewhere - dwa]