Hello,

[Rene, I suppose you are the person most familiar with the Python support in b2, so I suspect you know the answer to the below questions. But this is also about consistency, so I'd like to extend the question to understand how b2 deals with multiple values (such as for the "toolset" feature) in general.]

I'm reviewing the b2 logic in `python.jam` as well as Boost.Python's Jamfiles, and I'm not sure about the intended logic as far as multiple Python versions are concerned:

With my `user-config.jam` file containing two `using python ...` statements (with two distinct versions), is the intent for Boost.Python being built for both ? Or only if the two differ in the major version number (i.e., '2' and '3') ? And what about using "python=N" as command-line option to `b2` ? if I set "N" to be a version string not defined in my `user-config.jam` file, I get an error ("... is not a known value of feature <python"). But if I give a "known value", nothing happens, i.e. `b2` still builds both versions.

So what is the intended semantic for giving multiple python versions in my `user-config.jam` file, and what is the intent for "python=N" on the command line ?

Thanks,

        Stefan

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