[Boost-build] Manipulating requirements based on a program's return value

Subject: [Boost-build] Manipulating requirements based on a program's return value
From: Edward Diener (eldiener_at_[hidden])
Date: 2016-05-24 16:59:56

I am looking for a way in Boost Build that I can create a conditional 
requirement based on whether a particular program I run returns a 
particular value. In other words, instead of a conditional requirement like:

<toolset>gcc:<link>static

I could have a conditional requirement like:

run_some_program(pass_some_parameter)==1:<link>static

Of course I am making up syntax that has nothing to do with Boost build 
but the gist of my desire is to be able to set a conditional requirement 
based on a program's return value when passed some specific input 
parameter(s).

It seems as if this sort of thing should be possible in Boost Build but 
I have not figured out how to achieve it given my knowledge of Boost 
Build. Are there any facilities for doing such a thing in Boost Build ? 
If there are, any pointers would be helpful.