> I am trying to compile on a 64 bit AIX environment but
> want to compile in 32 bit mode. From what I gather this
> requires compiling/linking with -q32 compile/link option.
>
> I cant seem to get bjam to do this: I tried the following in site-config.jam
>
> using vacpp : : -q32 ;
>
> This compiles but does not produce the intended effect.
>

Unless you built the libraries with address-model=64, the boost build should default to a 32bit build.  You can the flip between 32bit and 64bit builds with bjam address-model=32 or bjam address-model=64 without modifying the site-config.jam file.  

I'm not sure one can specify compile options in that manner you have listed above.
 
Chris Cambly
XL C++ Compiler Development