[Boost-build] Address model support in gcc.jam

From: K. Noel Belcourt (kbelco_at_[hidden])
Date: 2006-12-01 17:51:21

Hi,

I'd like to add the ability to externally configure gcc to set the  
<address-model> so I've added these lines to gcc.jam.

flags gcc.compile OPTIONS <address-model>32 : -m32 -Wa,--32 ;
flags gcc.compile OPTIONS <address-model>64 : -m64 -Wa,--64 ;

flags gcc.link OPTIONS <address-model>32 : -m32 -Wa,--32 ;
flags gcc.link OPTIONS <address-model>64 : -m64 -Wa,--64 ;

I want give the user the ability to specify the address model from  
the command line and get it into the gcc toolset properties.  For  
sake of argument, my jamroot has this line in it.

constant cl-address-model : 32 ;

My user-config.jam looks like this but I know this doesn't work.

using gcc : 3.4.6 : :  <address-model>$(cl-address-model) ;

I need to have a single toolset description for gcc-3.4.6 whose  
address model can be specified by the user from the command line.  If  
the user doesn't set the address-model, we'll use what the compiler  
uses by default.  What's the best way to accomplish this?

Thanks.

-- Noel Belcourt